TS4962M 3W filter-free class D audio power amplifier Features Pin connections Operating from VCC = 2.4V to 5.5V Standby mode active low IN+ GND OUT- Output power: 3W into 4 and 1.75W into 8 with 10% THD+N max and 5V power supply. 1/A1 2/A2 3/A3 VDD VDD GND Output power: 2.3W @5V or 0.75W @ 3.0V into 4 with 1% THD+N max. 4/B1 5/B2 6/B3 IN- STBY OUT+ Output power: 1.4W @5V or 0.45W @ 3.0V into 8 with 1% THD+N max. 7/C1 8/C2 9/C3 Adjustable gain via external resistors Low current consumption 2mA @ 3V Efficiency: 88% typ. Signal to noise ratio: 85dB typ. PSRR: 63dB typ. @217Hz with 6dB gain PWM base frequency: 250kHz Low pop & click noise Thermal shutdown protection IN+: positive differential input IN-: negative differential input VDD: analog power supply GND: power supply ground STBY: standby pin (active low) OUT+: positive differential output OUT-: negative differential output Block diagram B1 B2 Vcc C2 Stdby 300k C1 Available in flip-chip 9 x 300m (Pb-free) InIn+ A1 Description Internal Bias Out+ 150k C3 Output PWM + H Bridge 150k A3 Out- Oscillator The TS4962M is a differential Class-D BTL power amplifier. It is able to drive up to 2.3W into a 4 load and 1.4W into a 8 load at 5V. It achieves outstanding efficiency (88%typ.) compared to classical Class-AB audio amps. The gain of the device can be controlled via two external gain-setting resistors. Pop & click reduction circuitry provides low on/off switch noise while allowing the device to start within 5ms. A standby function (active low) allows the reduction of current consumption to 10nA typ. January 2007 GND A2 B3 Applications Cellular phone PDA Notebook PC Rev 4 1/41 www.st.com 41 Contents TS4962M Contents 1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Application component information . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Electrical characteristic curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 5 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 5.1 Differential configuration principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 5.2 Gain in typical application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 5.3 Common mode feedback loop limitations . . . . . . . . . . . . . . . . . . . . . . . . . 29 For example: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 5.4 Low frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 5.5 Decoupling of the circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 5.6 Wake-up time: (tWU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 5.7 Shutdown time (tSTBY) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 5.8 Consumption in shutdown mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 5.9 Single-ended input configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 5.10 Output filter considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 5.11 Different examples with summed inputs . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Example 1: Dual differential inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Example 2: One differential input plus one single-ended input . . . . . . . . . . . . . . . 34 6 Demoboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 7 Footprint recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 8 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 9 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 2/41 TS4962M 1 Absolute maximum ratings Absolute maximum ratings Table 1. Absolute maximum ratings Symbol Parameter VCC Supply voltage(1), (2) Vin Input voltage (3) Value Unit 6 V GND to VCC V Toper Operating free-air temperature range -40 to + 85 C Tstg Storage temperature -65 to +150 C 150 C 200 C/W Tj Maximum junction temperature Rthja Thermal resistance junction to ambient Pdiss Power dissipation ESD Human body model ESD Latch-up VSTBY (4) Internally Limited(5) 2 kV Machine model 200 V Latch-up immunity 200 mA GND to VCC V 260 C Standby pin voltage maximum voltage (6) Lead temperature (soldering, 10sec) 1. Caution: This device is not protected in the event of abnormal operating conditions, such as for example, short-circuiting between any one output pin and ground, between any one output pin and VCC, and between individual output pins. 2. All voltage values are measured with respect to the ground pin. 3. The magnitude of the input signal must never exceed VCC + 0.3V / GND - 0.3V. 4. The device is protected in case of over temperature by a thermal shutdown active @ 150C. 5. Exceeding the power derating curves during a long period causes abnormal operation. 6. The magnitude of the standby signal must never exceed VCC + 0.3V / GND - 0.3V. Table 2. Operating conditions Symbol VCC VIC Parameter Value Unit 2.4 to 5.5 V 0.5 to VCC - 0.8 V 1.4 VSTBY VCC GND VSTBY 0.4 (4) V Load resistor 4 Thermal resistance junction to ambient (5) 90 C/W Supply voltage(1) Common mode input voltage range(2) Standby voltage input: (3) VSTBY RL Rthja Device ON Device OFF 1. For VCC from 2.4V to 2.5V, the operating temperature range is reduced to 0C Tamb 70C. 2. For VCC from 2.4V to 2.5V, the common mode input range must be set at VCC/2. 3. Without any signal on VSTBY, the device will be in standby. 4. Minimum current consumption is obtained when VSTBY = GND. 5. With heat sink surface = 125mm2. 3/41 Application component information 2 TS4962M Application component information Table 3. Component information Component Functional description Cs Bypass supply capacitor. Install as close as possible to the TS4962M to minimize high-frequency ripple. A 100nF ceramic capacitor should be added to enhance the power supply filtering at high frequency. Rin Input resistor to program the TS4962M differential gain (gain = 300k/Rin with Rin in k). Due to common mode feedback, these input capacitors are optional. However, they can be added to form with Rin a 1st order high pass filter with -3dB cut-off frequency = 1/(2**Rin*Cin). Input capacitor Figure 1. Typical application schematics Vcc B1 Vcc 300k C2 Stdby GND GND Rin + C1 Differential Input In- Cs 1u B2 Vcc In+ InIn+ A1 - Internal Bias GND Out+ 150k C3 Output PWM + H Bridge SPEAKER Rin Input capacitors are optional A3 150k Out- Oscillator GND TS4962 A2 B3 GND GND Vcc B1 Vcc Vcc In+ 300k C2 Stdby GND GND + Rin C1 Differential Input In- InIn+ - A1 Internal Bias 4 Ohms LC Output Filter GND Out+ 150k C3 15H Output PWM + 2F H GND Bridge Rin Input capacitors are optional GND Cs 1u B2 A3 150k Out- 2F 15H Oscillator TS4962 GND A2 B3 30H GND 1F GND 1F 30H 8 Ohms LC Output Filter 4/41 Load TS4962M Electrical characteristics 3 Electrical characteristics Table 4. VCC = +5V, GND = 0V, VIC = 2.5V, tamb = 25C (unless otherwise specified) Symbol ICC Parameter Conditions Supply current (1) Typ. Max. Unit No input signal, no load 2.3 3.3 mA No input signal, VSTBY = GND 10 1000 nA 3 25 mV ISTBY Standby current VOO Output offset voltage No input signal, RL = 8 Output power G=6dB THD = 1% max, F = 1kHz, RL = 4 THD = 10% max, F = 1kHz, RL = 4 THD = 1% max, F = 1kHz, RL = 8 THD = 10% max, F = 1kHz, RL = 8 Pout Total harmonic THD + N distortion + noise Efficiency Efficiency Min. 2.3 3 1.4 1.75 W Pout = 900mWRMS, G = 6dB, 20Hz < F < 20kHz RL = 8 + 15H, BW < 30kHz Pout = 1WRMS, G = 6dB, F = 1kHz, RL = 8 + 15H, BW < 30kHz 0.4 Pout = 2WRMS, RL = 4 + 15H Pout =1.2WRMS, RL = 8+ 15H 78 88 % 1 % PSRR Power supply rejection ratio with inputs grounded (2) F = 217Hz, RL = 8, G=6dB, Vripple = 200mVpp 63 dB CMRR Common mode rejection ratio F = 217Hz, RL = 8, G = 6dB, Vicm = 200mVpp 57 dB Gain value Rin in k Gain 273k ----------------R in 300k ----------------R in 327k ----------------R in V/V RSTBY Internal resistance from Standby to GND 273 300 327 k FPWM Pulse width modulator base frequency 180 250 320 kHz SNR Signal to noise ratio tWU Wake-up time 5 10 ms tSTBY Standby time 5 10 ms A-weighting, Pout = 1.2W, RL = 8 85 dB 5/41 Electrical characteristics Table 4. Symbol VN TS4962M VCC = +5V, GND = 0V, VIC = 2.5V, tamb = 25C (unless otherwise specified) (continued) Parameter Output voltage noise Conditions Min. Typ. F = 20Hz to 20kHz, G = 6dB Unweighted RL = 4 A-weighted RL = 4 85 60 Unweighted RL = 8 A-weighted RL = 8 86 62 Unweighted RL = 4 + 15H A-weighted RL = 4 + 15H 83 60 Unweighted RL = 4 + 30H A-weighted RL = 4 + 30H 88 64 Unweighted RL = 8 + 30H A-weighted RL = 8 + 30H 78 57 Unweighted RL = 4 + Filter A-weighted RL = 4 + Filter 87 65 Unweighted RL = 4 + Filter A-weighted RL = 4 + Filter 82 59 Max. Unit VRMS 1. Standby mode is active when VSTBY is tied to GND. 2. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is the superimposed sinusoidal signal to VCC @ F = 217Hz. 6/41 TS4962M Table 5. Symbol ICC Electrical characteristics VCC = +4.2V, GND = 0V, VIC = 2.5V, Tamb = 25C (unless otherwise specified)(1) Parameter Supply current (2) Conditions Typ. Max. Unit No input signal, no load 2.1 3 mA No input signal, VSTBY = GND 10 1000 nA 3 25 mV ISTBY Standby current VOO Output offset voltage No input signal, RL = 8 Output power G=6dB THD = 1% max, F = 1kHz, RL = 4 THD = 10% max, F = 1kHz, RL = 4 THD = 1% max, F = 1kHz, RL = 8 THD = 10% max, F = 1kHz, RL = 8 Pout Total harmonic THD + N distortion + noise Efficiency Efficiency Min. 1.6 2 0.95 1.2 Pout = 600mWRMS, G = 6dB, 20Hz < F < 20kHz RL = 8 + 15H, BW < 30kHz Pout = 700mWRMS, G = 6dB, F = 1kHz, RL = 8 + 15H, BW < 30kHz W 1 % 0.35 Pout = 1.45WRMS, RL = 4 + 15H Pout =0.9WRMS, RL = 8+ 15H 78 88 % PSRR Power supply rejection ratio with inputs grounded (3) F = 217Hz, RL = 8, G=6dB, Vripple = 200mVpp 63 dB CMRR Common mode rejection ratio F = 217Hz, RL = 8, G = 6dB, Vicm = 200mVpp 57 dB Gain value Rin in k Gain 273k ----------------R in 300k ----------------R in 327k ----------------R in V/V RSTBY Internal resistance from Standby to GND 273 300 327 k FPWM Pulse width modulator base frequency 180 250 320 kHz SNR Signal to noise ratio tWU Wake-uptime 5 10 ms tSTBY Standby time 5 10 ms A-weighting, Pout = 0.9W, RL = 8 85 dB 7/41 Electrical characteristics Table 5. Symbol VN TS4962M VCC = +4.2V, GND = 0V, VIC = 2.5V, Tamb = 25C (unless otherwise specified)(1) Parameter Output voltage noise Conditions Min. Typ. F = 20Hz to 20kHz, G = 6dB Unweighted RL = 4 A-weighted RL = 4 85 60 Unweighted RL = 8 A-weighted RL = 8 86 62 Unweighted RL = 4 + 15H A-weighted RL = 4 + 15H 83 60 Unweighted RL = 4 + 30H A-weighted RL = 4 + 30H 88 64 Unweighted RL = 8 + 30H A-weighted RL = 8 + 30H 78 57 Unweighted RL = 4 + Filter A-weighted RL = 4 + Filter 87 65 Unweighted RL = 4 + Filter A-weighted RL = 4 + Filter 82 59 Max. Unit VRMS 1. All electrical values are guaranteed with correlation measurements at 2.5V and 5V. 2. Standby mode is active when VSTBY is tied to GND. 3. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is the superimposed sinusoidal signal to VCC @ F = 217Hz. 8/41 TS4962M Table 6. Symbol ICC Electrical characteristics VCC = +3.6V, GND = 0V, VIC = 2.5V, Tamb = 25C (unless otherwise specified)(1) Parameter Conditions Supply current (2) Typ. Max. Unit No input signal, no load 2 2.8 mA No input signal, VSTBY = GND 10 1000 nA 3 25 mV ISTBY Standby current VOO Output offset voltage No input signal, RL = 8 Output power G=6dB THD = 1% max, F = 1kHz, RL = 4 THD = 10% max, F = 1kHz, RL = 4 THD = 1% max, F = 1kHz, RL = 8 THD = 10% max, F = 1kHz, RL = 8 Pout Total harmonic THD + N distortion + noise Efficiency Efficiency Min. 1.15 1.51 0.7 0.9 Pout = 500mWRMS, G = 6dB, 20Hz < F< 20kHz RL = 8 + 15H, BW < 30kHz Pout = 500mWRMS, G = 6dB, F = 1kHz, RL = 8 + 15H, BW < 30kHz W 1 % 0.27 Pout = 1WRMS, RL = 4 + 15H Pout =0.65WRMS, RL = 8+ 15H 78 88 % PSRR Power supply rejection ratio with inputs grounded (3) F = 217Hz, RL = 8, G=6dB, Vripple = 200mVpp 62 dB CMRR Common mode rejection ratio F = 217Hz, RL = 8, G = 6dB, Vicm = 200mVpp 56 dB Gain value Rin in k Gain 273k ----------------R in 300k ----------------R in 327k ----------------R in V/V RSTBY Internal resistance from Standby to GND 273 300 327 k FPWM Pulse width modulator base frequency 180 250 320 kHz SNR Signal to noise ratio tWU Wake-uptime 5 10 ms tSTBY Standby time 5 10 ms A-weighting, Pout = 0.6W, RL = 8 83 dB 9/41 Electrical characteristics Table 6. Symbol VN TS4962M VCC = +3.6V, GND = 0V, VIC = 2.5V, Tamb = 25C (unless otherwise specified)(1) Parameter Output voltage noise Conditions Min. Typ. F = 20Hz to 20kHz, G = 6dB Unweighted RL = 4 A-weighted RL = 4 83 57 Unweighted RL = 8 A-weighted RL = 8 83 61 Unweighted RL = 4 + 15H A-weighted RL = 4 + 15H 81 58 Unweighted RL = 4 + 30H A-weighted RL = 4 + 30H 87 62 Unweighted RL = 8 + 30H A-weighted RL = 8 + 30H 77 56 Unweighted RL = 4 + Filter A-weighted RL = 4 + Filter 85 63 Unweighted RL = 4 + Filter A-weighted RL = 4 + Filter 80 57 Max. Unit VRMS 1. All electrical values are guaranteed with correlation measurements at 2.5V and 5V. 2. Standby mode is active when VSTBY is tied to GND. 3. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is the superimposed sinusoidal signal to VCC @ F = 217Hz. 10/41 TS4962M Table 7. Symbol ICC Electrical characteristics VCC = +3V, GND = 0V, VIC = 2.5V, Tamb = 25C (unless otherwise specified)(1) Parameter Conditions Supply current (2) Typ. Max. Unit No input signal, no load 1.9 2.7 mA No input signal, VSTBY = GND 10 1000 nA 3 25 mV ISTBY Standby current VOO Output offset voltage No input signal, RL = 8 Output power G=6dB THD = 1% max, F = 1kHz, RL = 4 THD = 10% max, F = 1kHz, RL = 4 THD = 1% max, F = 1kHz, RL = 8 THD = 10% max, F = 1kHz, RL = 8 Pout Total harmonic THD + N distortion + noise Efficiency Efficiency Min. 0.75 1 0.5 0.6 Pout = 350mWRMS, G = 6dB, 20Hz < F < 20kHz RL = 8 + 15H, BW < 30kHz Pout = 350mWRMS, G = 6dB, F = 1kHz, RL = 8 + 15H, BW < 30kHz W 1 % 0.21 Pout = 0.7WRMS, RL = 4 + 15H Pout = 0.45WRMS, RL = 8+ 15H 78 88 % PSRR Power supply rejection ratio with inputs grounded (3) F = 217Hz, RL = 8, G=6dB, Vripple = 200mVpp 60 dB CMRR Common mode rejection ratio F = 217Hz, RL = 8, G = 6dB, Vicm = 200mVpp 54 dB Gain value Rin in k Gain 273k ----------------R in 300k ----------------R in 327k ----------------R in V/V RSTBY Internal resistance from Standby to GND 273 300 327 k FPWM Pulse width modulator base frequency 180 250 320 kHz SNR Signal to noise ratio tWU Wake-up time 5 10 ms tSTBY Standby time 5 10 ms A-weighting, Pout = 0.4W, RL = 8 82 dB 11/41 Electrical characteristics Table 7. Symbol VN TS4962M VCC = +3V, GND = 0V, VIC = 2.5V, Tamb = 25C (unless otherwise specified)(1) Parameter Conditions Min. Typ. f = 20Hz to 20kHz, G = 6dB Unweighted RL = 4 A-weighted RL = 4 83 57 Unweighted RL = 8 A-weighted RL = 8 83 61 Unweighted RL = 4 + 15H A-weighted RL = 4 + 15H 81 58 Output Voltage Noise Unweighted RL = 4 + 30H A-weighted RL = 4 + 30H 87 62 Unweighted RL = 8 + 30H A-weighted RL = 8 + 30H 77 56 Unweighted RL = 4 + Filter A-weighted RL = 4 + Filter 85 63 Unweighted RL = 4 + Filter A-weighted RL = 4 + Filter 80 57 Max. Unit VRMS 1. All electrical values are guaranteed with correlation measurements at 2.5V and 5V. 2. Standby mode is active when VSTBY is tied to GND. 3. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is the superimposed sinusoidal signal to VCC @ F = 217Hz. 12/41 TS4962M Table 8. Symbol ICC Electrical characteristics VCC = +2.5V, GND = 0V, VIC = 2.5V, Tamb = 25C (unless otherwise specified) Parameter Conditions Supply current (1) Typ. Max. Unit No input signal, no load 1.7 2.4 mA No input signal, VSTBY = GND 10 1000 nA 3 25 mV ISTBY Standby current VOO Output offset voltage No input signal, RL = 8 Output power G=6dB THD = 1% max, F = 1kHz, RL = 4 THD = 10% max, F = 1kHz, RL = 4 THD = 1% max, F = 1kHz, RL = 8 THD = 10% max, F = 1kHz, RL = 8 Pout Total harmonic THD + N distortion + noise Efficiency Efficiency Min. 0.52 0.71 0.33 0.42 Pout = 200mWRMS, G = 6dB, 20Hz < F< 20kHz RL = 8 + 15H, BW < 30kHz Pout = 200WRMS, G = 6dB, F = 1kHz, RL = 8 + 15H, BW < 30kHz W 1 % 0.19 Pout = 0.47WRMS, RL = 4 + 15H Pout = 0.3WRMS, RL = 8+ 15H 78 88 % PSRR Power supply rejection ratio with inputs grounded (2) F = 217Hz, RL = 8, G=6dB, Vripple = 200mVpp 60 dB CMRR Common mode rejection ratio F = 217Hz, RL = 8, G = 6dB, Vicm = 200mVpp 54 dB Gain value Rin in k Gain 273k ----------------R in 300k ----------------R in 327k ----------------R in V/V RSTBY Internal resistance from Standby to GND 273 300 327 k FPWM Pulse width modulator base frequency 180 250 320 kHz SNR Signal to noise ratio tWU Wake-up time 5 10 ms tSTBY Standby time 5 10 ms A-weighting, Pout = 1.2W, RL = 8 80 dB 13/41 Electrical characteristics Table 8. Symbol VN TS4962M VCC = +2.5V, GND = 0V, VIC = 2.5V, Tamb = 25C (unless otherwise specified) Parameter Conditions Min. Typ. F = 20Hz to 20kHz, G = 6dB Unweighted RL = 4 A-weighted RL = 4 85 60 Unweighted RL = 8 A-weighted RL = 8 86 62 Unweighted RL = 4 + 15H A-weighted RL = 4 + 15H 76 56 Output Voltage Noise Unweighted RL = 4 + 30H A-weighted RL = 4 + 30H 82 60 Unweighted RL = 8 + 30H A-weighted RL = 8 + 30H 67 53 Unweighted RL = 4 + Filter A-weighted RL = 4 + Filter 78 57 Unweighted RL = 4 + Filter A-weighted RL = 4 + Filter 74 54 Max. Unit VRMS 1. Standby mode is active when VSTBY is tied to GND. 2. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is the superimposed sinusoidal signal to VCC @ F = 217Hz. 14/41 TS4962M Table 9. Symbol ICC Electrical characteristics VCC = +2.4V, GND = 0V, VIC = 2.5V, Tamb = 25C (unless otherwise specified) Parameter Conditions Supply current (1) Min. Typ. Max. Unit No input signal, no load 1.7 mA No input signal, VSTBY = GND 10 nA 3 mV ISTBY Standby current VOO Output offset voltage No input signal, RL = 8 Output power G=6dB THD = 1% max, F = 1kHz, RL = 4 THD = 10% max, F = 1kHz, RL = 4 THD = 1% max, F = 1kHz, RL = 8 THD = 10% max, F = 1kHz, RL = 8 Total harmonic distortion + noise Pout = 200mWRMS, G = 6dB, 20Hz < F< 20kHz RL = 8 + 15H, BW < 30kHz 1 Pout = 0.38WRMS, RL = 4 + 15H Pout = 0.25WRMS, RL = 8+ 15H 77 86 % Common mode rejection ratio F = 217Hz, RL = 8, G = 6dB, Vicm = 200mVpp 54 dB Gain value Rin in k Pout THD + N Efficiency Efficiency CMRR Gain RSTBY Internal resistance from Standby to GND FPWM Pulse width modulator base frequency SNR Signal to noise ratio tWU tSTBY VN 0.48 0.65 0.3 0.38 W % 273k ----------------R in 300k ----------------R in 327k ----------------R in V/V 273 300 327 k 250 kHz 80 dB Wake-up time 5 ms Standby time 5 ms Output voltage noise A Weighting, Pout = 1.2W, RL = 8 F = 20Hz to 20kHz, G = 6dB Unweighted RL = 4 A-weighted RL = 4 85 60 Unweighted RL = 8 A-weighted RL = 8 86 62 Unweighted RL = 4 + 15H A-weighted RL = 4 + 15H 76 56 Unweighted RL = 4 + 30H A-weighted RL = 4 + 30H 82 60 Unweighted RL = 8 + 30H A-weighted RL = 8 + 30H 67 53 Unweighted RL = 4 + Filter A-weighted RL = 4 + Filter 78 57 Unweighted RL = 4 + Filter A-weighted RL = 4 + Filter 74 54 VRMS 1. Standby mode is active when VSTBY is tied to GND. 15/41 Electrical characteristic curves 4 TS4962M Electrical characteristic curves The graphs included in this section use the following abbreviations: RL + 15H or 30H = pure resistor + very low series resistance inductor Filter = LC output filter (1F+30H for 4 and 0.5F+60H for 8) All measurements done with Cs1=1F and Cs2=100nF except for PSRR where Cs1 is removed. Figure 2. Test diagram for measurements Vcc 1uF 100nF Cs2 Cs1 + Cin GND GND Rin Out+ In+ TS4962 Cin Rin 4 or 8 Ohms 15uH or 30uH 150k 5th order or RL filter LC Filter In- 50kHz low pass Out- 150k GND Audio Measurement Bandwidth < 30kHz Figure 3. Test diagram for PSRR measurements 100nF Cs2 20Hz to 20kHz Vcc GND 4.7uF GND Rin Out+ In+ 15uH or 30uH 150k or TS4962 4.7uF Rin 4 or 8 Ohms 5th order RL LC Filter InOut- 150k GND GND 5th order 50kHz low pass filter 16/41 Reference RMS Selective Measurement Bandwidth=1% of Fmeas 50kHz low pass filter TS4962M Electrical characteristic curves Figure 4. Current consumption vs. power supply voltage Figure 5. 2.5 2.5 Current Consumption (mA) Current Consumption (mA) No load Tamb=25C 2.0 1.5 1.0 0.5 0.0 2.0 1.5 1.0 0.5 0.0 0 Current consumption vs. standby voltage 1 2 3 4 5 Vcc = 5V No load Tamb=25C 0 1 2 Figure 6. Current consumption vs. standby voltage Figure 7. 2.0 4 5 Output offset voltage vs. common mode input voltage 10 G = 6dB Tamb = 25C 8 1.5 Voo (mV) Current Consumption (mA) 3 Standby Voltage (V) Power Supply Voltage (V) 1.0 0.5 0.0 0.0 1.0 1.5 2.0 2.5 0 0.0 3.0 Vcc=5V Vcc=3.6V 4 2 Vcc = 3V No load Tamb=25C 0.5 6 Vcc=2.5V 0.5 1.0 Figure 8. 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 Common Mode Input Voltage (V) Standby Voltage (V) Efficiency vs. output power Figure 9. 100 Efficiency vs. output power 100 200 600 400 60 300 40 Power Dissipation 20 0 0.0 0.5 200 Vcc=5V RL=4 + 15H 100 F=1kHz THD+N1% 0 1.0 1.5 2.0 2.3 Output Power (W) 80 150 Efficiency (%) 500 60 100 Power Dissipation 40 20 0 0.0 0.1 Vcc=3V 50 RL=4 + 15H F=1kHz THD+N1% 0 0.2 0.3 0.4 0.5 0.6 0.7 Output Power (W) Power Dissipation (mW) Efficiency Efficiency Power Dissipation (mW) Efficiency (%) 80 17/41 Electrical characteristic curves TS4962M Figure 10. Efficiency vs. output power Figure 11. Efficiency vs. output power 100 100 75 100 60 40 Power Dissipation 50 Vcc=5V RL=8 + 15H F=1kHz THD+N1% 20 0 0.0 0.2 0.4 0.6 0.8 Output Power (W) 1.0 80 Efficiency 50 60 40 20 0 1.4 1.2 0 0.0 Figure 12. Output power vs. power supply voltage 0.1 Vcc=3V RL=8 + 15H F=1kHz THD+N1% 0.2 0.3 Output Power (W) 0 0.5 0.4 Figure 13. Output power vs. power supply voltage 2.0 3.5 RL = 4 + 15H F = 1kHz 3.0 BW < 30kHz Tamb = 25C 2.5 THD+N=10% Output power (W) Output power (W) 25 Power Dissipation Power Dissipation (mW) Efficiency (%) Efficiency Efficiency (%) 80 Power Dissipation (mW) 150 2.0 1.5 THD+N=1% 1.0 RL = 8 + 15H F = 1kHz BW < 30kHz 1.5 Tamb = 25C THD+N=10% 1.0 0.5 THD+N=1% 0.5 0.0 2.5 3.0 3.5 4.0 Vcc (V) 4.5 5.0 0.0 5.5 Figure 14. PSRR vs. frequency 4.0 Vcc (V) 4.5 5.0 5.5 -30 -20 -40 Vcc=5V, 3.6V, 2.5V -50 -30 -40 Vcc=5V, 3.6V, 2.5V -50 -60 -60 -70 -70 20 100 Vripple = 200mVpp Inputs = Grounded G = 6dB, Cin = 4.7F RL = 4 + 30H R/R0.1% Tamb = 25C -10 PSRR (dB) -20 PSRR (dB) 3.5 0 Vripple = 200mVpp Inputs = Grounded G = 6dB, Cin = 4.7F RL = 4 + 15H R/R0.1% Tamb = 25C -10 18/41 3.0 Figure 15. PSRR vs. frequency 0 -80 2.5 1000 Frequency (Hz) 10000 20k -80 20 100 1000 Frequency (Hz) 10000 20k TS4962M Electrical characteristic curves Figure 16. PSRR vs. frequency Figure 17. PSRR vs. frequency 0 0 Vripple = 200mVpp Inputs = Grounded G = 6dB, Cin = 4.7F RL = 4 + Filter R/R0.1% Tamb = 25C PSRR (dB) -20 -30 -20 -40 Vcc=5V, 3.6V, 2.5V -50 -30 -40 -60 -70 -70 -80 20 100 10000 20k 1000 Frequency (Hz) Figure 18. PSRR vs. frequency 1000 Frequency (Hz) 10000 20k -30 -20 -40 Vcc=5V, 3.6V, 2.5V -50 -30 -40 -60 -70 -70 -80 100 10000 20k 1000 Frequency (Hz) Figure 20. PSRR vs. common mode input voltage -20 20 100 1000 Frequency (Hz) 10000 20k Figure 21. CMRR vs. frequency 0 -10 Vcc=5V, 3.6V, 2.5V -50 -60 20 Vripple = 200mVpp Inputs = Grounded G = 6dB, Cin = 4.7F R/R0.1% RL = 8 + Filter Tamb = 25C -10 PSRR (dB) -20 -80 100 0 Vripple = 200mVpp Inputs = Grounded G = 6dB, Cin = 4.7F RL = 8 + 30H R/R0.1% Tamb = 25C -10 PSRR (dB) 20 Figure 19. PSRR vs. frequency 0 0 Vripple = 200mVpp F = 217Hz, G = 6dB RL 4 + 15H Tamb = 25C Vcc=2.5V -20 -30 CMRR (dB) PSRR(dB) Vcc=5V, 3.6V, 2.5V -50 -60 -80 Vripple = 200mVpp Inputs = Grounded G = 6dB, Cin = 4.7F RL = 8 + 15H R/R0.1% Tamb = 25C -10 PSRR (dB) -10 Vcc=3.6V -40 RL=4 + 15H G=6dB Vicm=200mVpp R/R0.1% Cin=4.7F Tamb = 25C -40 -50 Vcc=5V, 3.6V, 2.5V -60 -60 -70 Vcc=5V -80 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 Common Mode Input Voltage (V) 4.5 5.0 20 100 1000 Frequency (Hz) 10000 20k 19/41 Electrical characteristic curves TS4962M Figure 22. CMRR vs. frequency Figure 23. CMRR vs. frequency 0 0 RL=4 + 30H G=6dB Vicm=200mVpp R/R0.1% Cin=4.7F Tamb = 25C -20 CMRR (dB) CMRR (dB) -20 -40 -40 Vcc=5V, 3.6V, 2.5V Vcc=5V, 3.6V, 2.5V -60 -60 20 100 1000 Frequency (Hz) 20 10000 20k Figure 24. CMRR vs. frequency 10000 20k 1000 Frequency (Hz) 0 RL=8 + 15H G=6dB Vicm=200mVpp R/R0.1% Cin=4.7F Tamb = 25C RL=8 + 30H G=6dB Vicm=200mVpp R/R0.1% Cin=4.7F Tamb = 25C -20 CMRR (dB) CMRR (dB) -20 -40 Vcc=5V, 3.6V, 2.5V -40 Vcc=5V, 3.6V, 2.5V -60 -60 20 100 1000 Frequency (Hz) 20 10000 20k Figure 26. CMRR vs. frequency 100 10000 20k 1000 Frequency (Hz) Figure 27. CMRR vs. common mode input voltage -20 0 RL=8 + Filter G=6dB Vicm=200mVpp R/R0.1% Cin=4.7F Tamb = 25C -30 CMRR(dB) CMRR (dB) 100 Figure 25. CMRR vs. frequency 0 -20 RL=4 + Filter G=6dB Vicm=200mVpp R/R0.1% Cin=4.7F Tamb = 25C -40 Vcc=5V, 3.6V, 2.5V -40 Vicm = 200mVpp F = 217Hz G = 6dB RL 4 + 15H Tamb = 25C Vcc=2.5V -50 Vcc=3.6V -60 -60 Vcc=5V 20 20/41 100 1000 Frequency (Hz) 10000 20k -70 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 Common Mode Input Voltage (V) 4.5 5.0 TS4962M Electrical characteristic curves Figure 28. THD+N vs. output power Figure 29. THD+N vs. output power 10 10 Vcc=5V Vcc=2.5V 1 1E-3 0.01 0.1 Output Power (W) 1 Vcc=2.5V 1 1E-3 3 Figure 30. THD+N vs. output power 0.01 0.1 Output Power (W) 1 3 Figure 31. THD+N vs. output power 10 10 RL = 8 + 15H F = 100Hz G = 6dB BW < 30kHz Tamb = 25C RL = 8 + 30H or Filter F = 100Hz G = 6dB BW < 30kHz Tamb = 25C Vcc=5V Vcc=3.6V THD + N (%) THD + N (%) Vcc=5V Vcc=3.6V 0.1 0.1 Vcc=2.5V 1 Vcc=5V Vcc=3.6V Vcc=2.5V 1 0.1 0.1 1E-3 0.01 0.1 Output Power (W) 1 1E-3 2 Figure 32. THD+N vs. output power 0.01 0.1 Output Power (W) 1 2 Figure 33. THD+N vs. output power 10 10 RL = 4 + 15H F = 1kHz G = 6dB BW < 30kHz Tamb = 25C Vcc=3.6V Vcc=2.5V 1 0.1 1E-3 RL = 4 + 30H or Filter F = 1kHz G = 6dB BW < 30kHz Tamb = 25C Vcc=5V THD + N (%) THD + N (%) RL = 4 + 30H or Filter F = 100Hz G = 6dB BW < 30kHz Tamb = 25C Vcc=3.6V THD + N (%) THD + N (%) RL = 4 + 15H F = 100Hz G = 6dB BW < 30kHz Tamb = 25C 0.01 0.1 Output Power (W) 1 3 Vcc=5V Vcc=3.6V Vcc=2.5V 1 0.1 1E-3 0.01 0.1 Output Power (W) 1 3 21/41 Electrical characteristic curves TS4962M Figure 34. THD+N vs. output power Figure 35. THD+N vs. output power 10 RL = 8 + 15H F = 1kHz G = 6dB BW < 30kHz Tamb = 25C Vcc=3.6V Vcc=2.5V 1 0.1 1E-3 0.01 0.1 Output Power (W) 1 0.01 0.1 Output Power (W) 1 2 10 RL=4 + 15H G=6dB Bw < 30kHz Vcc=5V Tamb = 25C 1 Po=0.75W 0.1 50 100 RL=4 + 30H or Filter G=6dB Bw < 30kHz Vcc=5V Tamb = 25C Po=1.5W THD + N (%) THD + N (%) Vcc=3.6V Vcc=2.5V Figure 37. THD+N vs. frequency 10 1000 Frequency (Hz) 10000 20k Po=1.5W 1 Po=0.75W 0.1 Figure 38. THD+N vs. frequency 50 100 1000 Frequency (Hz) 10000 20k Figure 39. THD+N vs. frequency 10 10 RL=4 + 30H or Filter G=6dB Bw < 30kHz Vcc=3.6V Tamb = 25C Po=0.9W THD + N (%) RL=4 + 15H G=6dB Bw < 30kHz Vcc=3.6V Tamb = 25C 1 Po=0.9W 1 Po=0.45W Po=0.45W 0.1 0.1 50 22/41 Vcc=5V 1 0.1 1E-3 2 Figure 36. THD+N vs. frequency THD + N (%) RL = 8 + 30H or Filter F = 1kHz G = 6dB BW < 30kHz Tamb = 25C Vcc=5V THD + N (%) THD + N (%) 10 100 1000 Frequency (Hz) 10000 20k 50 100 1000 Frequency (Hz) 10000 20k TS4962M Electrical characteristic curves Figure 40. THD+N vs. frequency Figure 41. THD+N vs. frequency 10 RL=4 + 15H G=6dB Bw < 30kHz Vcc=2.5V Tamb = 25C RL=4 + 30H or Filter G=6dB Bw < 30kHz Vcc=2.5V Tamb = 25C Po=0.4W THD + N (%) THD + N (%) 10 1 Po=0.4W 1 Po=0.2W Po=0.2W 0.1 0.1 1000 Frequency (Hz) 200 10000 20k Figure 42. THD+N vs. frequency 10000 20k 10 Po=0.9W 1 0.1 100 1000 Frequency (Hz) Po=0.45W 50 10000 20k Figure 44. THD+N vs. frequency Po=0.9W 1 0.1 Po=0.45W 50 RL=8 + 30H or Filter G=6dB Bw < 30kHz Vcc=5V Tamb = 25C THD + N (%) RL=8 + 15H G=6dB Bw < 30kHz Vcc=5V Tamb = 25C THD + N (%) 1000 Frequency (Hz) Figure 43. THD+N vs. frequency 10 100 1000 Frequency (Hz) 10000 20k Figure 45. THD+N vs. frequency 10 10 RL=8 + 15H G=6dB Bw < 30kHz Vcc=3.6V Tamb = 25C Po=0.5W THD + N (%) THD + N (%) 100 50 1 0.1 100 1000 Frequency (Hz) Po=0.5W 1 0.1 Po=0.25W 50 RL=8 + 30H or Filter G=6dB Bw < 30kHz Vcc=3.6V Tamb = 25C 10000 20k Po=0.25W 50 100 1000 Frequency (Hz) 10000 20k 23/41 Electrical characteristic curves TS4962M Figure 46. THD+N vs. frequency Figure 47. THD+N vs. frequency 10 10 THD + N (%) 1 Po=0.2W RL=8 + 30H or Filter G=6dB Bw < 30kHz Vcc=2.5V Tamb = 25C 1 THD + N (%) RL=8 + 15H G=6dB Bw < 30kHz Vcc=2.5V Tamb = 25C 0.1 0.1 Po=0.1W 0.01 50 100 1000 Frequency (Hz) Po=0.1W 10000 20k 8 6 6 Vcc=5V, 3.6V, 2.5V RL=4 + 15H G=6dB Vin=500mVpp Cin=1F Tamb = 25C 2 20 100 10000 20k 20 8 6 6 0 Vcc=5V, 3.6V, 2.5V RL=4 + Filter G=6dB Vin=500mVpp Cin=1F Tamb = 25C 100 1000 Frequency (Hz) 100 1000 Frequency (Hz) 10000 20k Vcc=5V, 3.6V, 2.5V 4 10000 20k RL=8 + 15H G=6dB Vin=500mVpp Cin=1F Tamb = 25C 2 0 20 10000 20k RL=4 + 30H G=6dB Vin=500mVpp Cin=1F Tamb = 25C 2 8 2 1000 Frequency (Hz) Figure 51. Gain vs. frequency Differential Gain (dB) Differential Gain (dB) Figure 50. Gain vs. frequency 4 100 Vcc=5V, 3.6V, 2.5V 4 0 1000 Frequency (Hz) 50 Figure 49. Gain vs. frequency 8 0 24/41 0.01 Differential Gain (dB) Differential Gain (dB) Figure 48. Gain vs. frequency 4 Po=0.2W 20 100 1000 Frequency (Hz) 10000 20k TS4962M Electrical characteristic curves Figure 53. Gain vs. frequency 8 8 6 6 Differential Gain (dB) Differential Gain (dB) Figure 52. Gain vs. frequency Vcc=5V, 3.6V, 2.5V 4 RL=8 + 30H G=6dB Vin=500mVpp Cin=1F Tamb = 25C 2 0 Vcc=5V, 3.6V, 2.5V 4 0 20 100 1000 Frequency (Hz) 10000 20k Figure 54. Gain vs. frequency RL=8 + Filter G=6dB Vin=500mVpp Cin=1F Tamb = 25C 2 20 100 1000 Frequency (Hz) 10000 20k Figure 55. Startup & shutdown time VCC = 5V, G = 6dB, Cin = 1F (5ms/div) 8 Differential Gain (dB) Vo1 6 Vo2 Vcc=5V, 3.6V, 2.5V 4 Standby RL=No Load G=6dB Vin=500mVpp Cin=1F Tamb = 25C 2 0 20 100 Vo1-Vo2 1000 Frequency (Hz) 10000 20k 25/41 Electrical characteristic curves Figure 56. Startup & shutdown time VCC = 3V, G = 6dB, Cin = 1F (5ms/div) TS4962M Figure 57. Startup & shutdown time VCC = 5V, G = 6dB, Cin = 100nF (5ms/div) Vo1 Vo1 Vo2 Vo2 Standby Standby Vo1-Vo2 Figure 58. Startup & shutdown time VCC = 3V, G = 6dB, Cin = 100nF (5ms/div) Figure 59. Startup & shutdown time VCC = 5V, G = 6dB, No Cin (5ms/div) Vo1 Vo1 Vo2 Vo2 Standby Standby Vo1-Vo2 26/41 Vo1-Vo2 Vo1-Vo2 TS4962M Electrical characteristic curves Figure 60. Startup & shutdown time VCC = 3V, G = 6dB, No Cin (5ms/div) Vo1 Vo2 Standby Vo1-Vo2 27/41 Application information TS4962M 5 Application information 5.1 Differential configuration principle The TS4962M is a monolithic fully-differential input/output class D power amplifier. The TS4962M also includes a common-mode feedback loop that controls the output bias value to average it at VCC/2 for any DC common mode input voltage. This allows the device to always have a maximum output voltage swing, and by consequence, maximizes the output power. Moreover, as the load is connected differentially compared to a single-ended topology, the output is four times higher for the same power supply voltage. The advantages of a full-differential amplifier are: High PSRR (power supply rejection ratio). High common mode noise rejection. Virtually zero pop without additional circuitry, giving a faster start-up time compared to conventional single-ended input amplifiers. Easier interfacing with differential output audio DAC. No input coupling capacitors required due to common mode feedback loop. The main disadvantage is: 5.2 As the differential function is directly linked to external resistor mismatching, paying particular attention to this mismatching is mandatory in order to obtain the best performance from the amplifier. Gain in typical application schematic Typical differential applications are shown in Figure 1 on page 4. In the flat region of the frequency-response curve (no input coupling capacitor effect), the differential gain is expressed by the relation: + AV diff - 300 - Out- = -------------------------------------= Out + R in In - In with Rin expressed in k. Due to the tolerance of the internal 150k feedback resistor, the differential gain will be in the range (no tolerance on Rin): 273 ---------- A V 327 ---------diff R in R in 28/41 TS4962M 5.3 Application information Common mode feedback loop limitations As explained previously, the common mode feedback loop allows the output DC bias voltage to be averaged at VCC/2 for any DC common mode bias input voltage. However, due to Vicm limitation in the input stage (see Table 2: Operating conditions on page 3), the common mode feedback loop can ensure its role only within a defined range. This range depends upon the values of VCC and Rin (AVdiff). To have a good estimation of the Vicm value, we can apply this formula (no tolerance on Rin): V CC x R in + 2 x V IC x 150k V icm = -----------------------------------------------------------------------------2 x ( R in + 150k) (V) with + - In + In V IC = --------------------2 (V) and the result of the calculation must be in the range: 0.5V V icm V CC - 0.8V Due to the +/-9% tolerance on the 150k resistor, it's also important to check Vicm in these conditions: V CC x R in + 2 x V IC x 163.5k V CC x R in + 2 x V IC x 136.5k ----------------------------------------------------------------------------------- V icm ---------------------------------------------------------------------------------2 x ( R in + 136.5k) 2 x ( R in + 163.5k) If the result of Vicm calculation is not in the previous range, input coupling capacitors must be used (with VCC from 2.4V to 2.5V, input coupling capacitors are mandatory). For example: With VCC = 3V, Rin = 150k and VIC = 2.5V, we typically find Vicm = 2V and this is lower than 3V - 0.8V = 2.2V. With 136.5k we find 1.97V, and with 163.5k we have 2.02V. So, no input coupling capacitors are required. 5.4 Low frequency response If a low frequency bandwidth limitation is requested, it is possible to use input coupling capacitors. In the low frequency region, Cin (input coupling capacitor) starts to have an effect. Cin forms, with Rin, a first order high-pass filter with a -3dB cut-off frequency: 1 F CL = -------------------------------------2 x R in x C in (Hz) So, for a desired cut-off frequency we can calculate Cin, 1 C in = ---------------------------------------2 x R in x F CL (F) with Rin in and FCL in Hz. 29/41 Application information 5.5 TS4962M Decoupling of the circuit A power supply capacitor, referred to as CS, is needed to correctly bypass the TS4962M. The TS4962M has a typical switching frequency at 250kHz and output fall and rise time about 5ns. Due to these very fast transients, careful decoupling is mandatory. A 1F ceramic capacitor is enough, but it must be located very close to the TS4962M in order to avoid any extra parasitic inductance created an overly long track wire. In relation with dI/dt, this parasitic inductance introduces an overvoltage that decreases the global efficiency and, if it is too high, may cause a breakdown of the device. In addition, even if a ceramic capacitor has an adequate high frequency ESR value, its current capability is also important. A 0603 size is a good compromise, particularly when a 4 load is used. Another important parameter is the rated voltage of the capacitor. A 1F/6.3V capacitor used at 5V, loses about 50% of its value. In fact, with a 5V power supply voltage, the decoupling value is about 0.5F instead of 1F. As CS has particular influence on the THD+N in the medium-high frequency region, this capacitor variation becomes decisive. In addition, less decoupling means higher overshoots, which can be problematic if they reach the power supply AMR value (6V). 5.6 Wake-up time (tWU) When the standby is released to set the device ON, there is a wait of about 5ms. The TS4962M has an internal digital delay that mutes the outputs and releases them after this time in order to avoid any pop noise. 5.7 Shutdown time (tSTBY) When the standby command is set, the time required to put the two output stages into high impedance and to put the internal circuitry in shutdown mode, is about 5ms. This time is used to decrease the gain and avoid any pop noise during shutdown. 5.8 Consumption in shutdown mode Between the shutdown pin and GND there is an internal 300k resistor. This resistor forces the TS4962M to be in standby mode when the standby input pin is left floating. However, this resistor also introduces additional power consumption if the shutdown pin voltage is not 0V. For example, with a 0.4V standby voltage pin, Table 2: Operating conditions on page 3, shows that you must add 0.4V/300k = 1.3A in typical (0.4V/273k= 1.46A in maximum) to the shutdown current specified in Table 4 on page 5. 5.9 Single-ended input configuration It is possible to use the TS4962M in a single-ended input configuration. However, input coupling capacitors are needed in this configuration. The schematic in Figure 61 shows a single-ended input typical application. 30/41 TS4962M Application information Figure 61. Single-ended input typical application Vcc B1 Cs 1u B2 Vcc Standby Cin GND Rin C2 Stdby 300k Ve C1 A1 Internal Bias GND Out+ 150k C3 Output - InIn+ + H Bridge PWM SPEAKER Rin Cin A3 150k Out- Oscillator GND GND TS4962 B3 A2 GND All formulas are identical except for the gain (with Rin in k) : AV sin gle Ve - = 300 = --------------------------------------+ R in Out - Out And, due to the internal resistor tolerance we have: 273 327 ---------- A V ---------sin gle R in R in In the event that multiple single-ended inputs are summed, it is important that the impedance on both TS4962M inputs (In- and In+) are equal. Figure 62. Typical application schematic with multiple single-ended inputs Vcc Vek Standby B1 C2 Stdby GND Ve1 Cin1 Rin1 C1 A1 GND Ceq GND Cs 1u B2 Vcc Rink 300k Cink Internal Bias GND Out+ 150k C3 Output - InIn+ + PWM H Bridge SPEAKER Req A3 150k Out- Oscillator TS4962 GND A2 B3 GND 31/41 Application information TS4962M We have the following equations: + 300 300 Out - Out = V e1 x ------------- + ...+ V ek x ------------R ink R in1 (V) k C eq = C inj j=1 C inj 1 = ------------------------------------------------------2x x R x F inj CLj (F) 1 R eq = -----------------k 1 --------Rinj j =1 In general, for mixed situations (single-ended and differential inputs), it is best to use the same rule, that is, to equalize impedance on both TS4962M inputs. 5.10 Output filter considerations The TS4962M is designed to operate without an output filter. However, due to very sharp transients on the TS4962M output, EMI radiated emissions may cause some standard compliance issues. These EMI standard compliance issues can appear if the distance between the TS4962M outputs and loudspeaker terminal is long (typically more than 50mm, or 100mm in both directions, to the speaker terminals). As the PCB layout and internal equipment device are different for each configuration, it is difficult to provide a one-size-fits-all solution. However, to decrease the probability of EMI issues, there are several simple rules to follow: Reduce, as much as possible, the distance between the TS4962M output pins and the speaker terminals. Use ground planes for "shielding" sensitive wires. Place, as close as possible to the TS4962M and in series with each output, a ferrite bead with a rated current at minimum 2A and impedance greater than 50 at frequencies above 30MHz. If, after testing, these ferrite beads are not necessary, replace them by a short-circuit. Murata BLM18EG221SN1 or BLM18EG121SN1 are possible examples of devices you can use. Allow enough footprint to place, if necessary, a capacitor to short perturbations to ground (see the schematics in Figure 63). Figure 63. Method for shorting pertubations to ground Ferrite chip bead To speaker From TS4962 output about 100pF Gnd 32/41 TS4962M Application information In the case where the distance between the TS4962M outputs and speaker terminals is high, it is possible to have low frequency EMI issues due to the fact that the typical operating frequency is 250kHz. In this configuration, we recommend using an output filter (as shown in Figure 1: Typical application schematics on page 4). It should be placed as close as possible to the device. 5.11 Different examples with summed inputs Example 1: Dual differential inputs Figure 64. Typical application schematic with dual differential inputs Vcc Standby B1 Cs 1u B2 Vcc C2 Stdby 300k R2 E2+ R1 E1+ E1- C1 A1 Internal Bias GND Out+ 150k C3 Output - InIn+ + H Bridge PWM SPEAKER R1 A3 150k E2R2 Out- Oscillator GND B3 A2 TS4962 GND With (Ri in k): + - + - Out - Out- = 300 A V = --------------------------------------1 + R1 E1 - E1 300 Out - Out A V = ------------------------------- = ---------2 + R2 E2 - E2 V CC x R 1 x R 2 + 300 x ( V IC1 x R 2 + V IC2 x R 1 ) 0.5V -------------------------------------------------------------------------------------------------------------------------------- V CC - 0.8V 300 x ( R 1 + R 2 ) + 2 x R 1 x R 2 + - + - E1 + E1 E2 + E2 and V IC = -----------------------V IC = -----------------------1 2 2 2 33/41 Application information TS4962M Example 2: One differential input plus one single-ended input Figure 65. Typical application schematic with one differential input plus one singleended input Vcc Standby B1 Cs 1u B2 Vcc C2 Stdby 300k R2 E2+ C1 R1 E1+ E2- C1 A1 Internal Bias Out+ 150k Output - InIn+ + PWM H Bridge SPEAKER R2 A3 150k GND C1 R1 Out- Oscillator GND A2 B3 GND With (Ri in k): + - + - - Out- = --------300A V = Out -----------------------------1 + R1 E1 Out - Out- = 300 A V = --------------------------------------2 + R2 E2 - E2 1 C 1 = -------------------------------------2 x R 1 x F CL 34/41 GND C3 (F) TS4962 TS4962M Demoboard A demoboard for the TS4962M is available with a flip-chip to DIP adapter. For more information about this demoboard, refer to Application Note AN2134. Figure 66. Schematic diagram of mono class D demoboard for TS4962M Vcc Vcc Cn1 + J1 1 2 3 + Cn2 GND GND C1 2.2uF/10V Vcc GND Cn4 + J2 3 8 U1 Vcc C2 300k 4 Stdby R1 Internal Bias Out+ 150k 6 Cn3 5 100nF 150k Positive Input Negative input InIn+ 100nF R2 1 PWM + Positive Output H Bridge Negative Output 10 150k 150k C3 Cn6 Output - Out- Oscillator TS4962 Flip-Chip to DIP Adapter GND 2 Cn5 + J3 3 GND Pin3 pin8 Figure 67. Diagram for flip-chip-to-DIP adapter R1 OR + C1 C2 1uF 100nF B1 B2 Vcc Pin1 C1 A1 Internal Bias Out+ 150k C3 Pin6 Output - InIn+ + H PWM Bridge A3 150k Pin10 Out- Oscillator GND A2 B3 TS4962 R2 OR Pin9 Pin5 C2 Stdby Pin2 Pin4 300k 6 Demoboard 35/41 Demoboard TS4962M Figure 68. Top view Figure 69. Bottom layer Figure 70. Top layer 36/41 TS4962M Footprint recommendations Figure 71. Footprint recommendations 500m 75m min. 100m max. 500m 500m =250m =400m typ. Track 150m min. =340m min. 500m 7 Footprint recommendations Non Solder mask opening Pad in Cu 18m with Flash NiAu (2-6m, 0.2m max.) 37/41 Package information 8 TS4962M Package information In order to meet environmental requirements, STMicroelectronics offers these devices in ECOPACK(R) packages. These packages have a lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an STMicroelectronics trademark. ECOPACK specifications are available at: www.st.com. Figure 72. Pin-out for 9-bump flip-chip (top view) IN+ GND OUT- 1/A1 2/A2 3/A3 VDD VDD GND Bumps are underneath 4/B1 5/B2 6/B3 Bump diameter = 300m IN- STBY OUT+ 8/C2 9/C3 7/C1 Figure 73. Marking for 9-bump flip-chip (top view) ST Logo E XXX YWW Symbol for lead-free: E Two first XX product code: 62 third X: Assembly code Three digits date code: Y for year - WW for week The dot is for marking pin A1 Figure 74. Mechanical data for 9-bump flip-chip 1.60 mm 1.60 mm 0.5mm 0.5mm 0.25mm 600m 38/41 Die size: 1.6mm x 1.6mm 30m Die height (including bumps): 600m Bump diameter: 315m 50m Bump diameter before reflow: 300m 10m Bump height: 250m 40m Die height: 350m 20m Pitch: 500m 50m Coplanarity: 50m max TS4962M 9 Ordering information Ordering information Table 10. Order codes Part number TS4962MEIJT Temperature range Package Packing Marking -40C to +85C Lead-free flip-chip Tape & reel 62 39/41 Revision history 10 40/41 TS4962M Revision history Date Revision Changes Oct. 2005 1 First release corresponding to the product preview version. Nov. 2005 2 Electrical data updated for output voltage noise, see Table 4, Table 5, Table 6, Table 7, Table 8 andTable 9 Formatting changes throughout. Dec. 2005 3 Product in full production. 10-Jan-2007 4 Template update, no technical changes. TS4962M Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries ("ST") reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST's terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. 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