INTEGRATED CIRCUITS DATA SHEET TDA1072A AM receiver circuit Product specification File under Integrated Circuits, IC01 May 1984 Philips Semiconductors Product specification AM receiver circuit TDA1072A GENERAL DESCRIPTION The TDA1072A integrated AM receiver circuit performs the active and part of the filtering functions of an AM radio receiver. It is intended for use in mains-fed home receivers and car radios. The circuit can be used for oscillator frequencies up to 50 MHz and can handle r.f. signals up to 500 mV. R.F. radiation and sensitivity to interference are minimized by an almost symmetrical design. The voltage-controlled oscillator provides signals with extremely low distortion and high spectral purity over the whole frequency range even when tuning with variable capacitance diodes. If required, band switching diodes can easily be applied. Selectivity is obtained using a block filter before the i.f. amplifier. Features * Inputs protected against damage by static discharge * Gain-controlled r.f. stage * Double balanced mixer * Separately buffered, voltage-controlled and temperature-compensated oscillator, designed for simple coils * Gain-controlled i.f. stage with wide a.g.c. range * Full-wave, balanced envelope detector * Internal generation of a.g.c. voltage with possibility of second-order filtering * Buffered field strength indicator driver with short-circuit protection * A.F. preamplifier with possibilities for simple a.f. filtering * Electronic standby switch. QUICK REFERENCE DATA Supply voltage range VP 7,5 to 18 V 15 to 30 mA Supply current range IP R.F. input voltage for S + N/N = 6 dB at m = 30% Vi typ. 1,5 V Vi typ. 500 mV Vo(af) typ. 310 mV typ. 86 dB typ. 2,8 V R.F. input voltage for 3% total harmonic distortion (THD) at m = 80% A.F. output voltage with Vi = 2 mV; fi = 1 MHz; m = 30% and fm = 400 Hz A.G.C. range: change of Vi for 1 dB change of Vo(af) Field strength indicator voltage at Vi = 500 mV; RL(9) = 2,7 k VIND PACKAGE OUTLINE 16-lead DIL; plastic (SOT38); SOT38-1; 1996 August 09. May 1984 2 Philips Semiconductors Product specification AM receiver circuit TDA1072A (1) Coil data: TOKO sample no. 7XNS-A7523DY; L1 : N1/N2 = 12/32; Qo = 65; QB = 57. Filter data: ZF = 700 at R3-4 = 3 k; ZI = 4,8 k. Fig.1 Block diagram and test circuit (connections shown in broken lines are not part of the test circuit). May 1984 3 Philips Semiconductors Product specification AM receiver circuit TDA1072A FUNCTIONAL DESCRIPTION Gain-controlled r.f. stage and mixer The differential amplifier in the r.f. stage employs an a.g.c. negative feedback network to provide a wide dynamic range. Very good cross-modulation behaviour is achieved by a.g.c. delays at the various signal stages. Large signals are handled with low distortion and the S/N ratio of small signals is improved. Low noise working is achieved in the differential amplifier by using transistors with low base resistance. A double balanced mixer provides the i.f. output signal to pin 1. Oscillator The differential amplifier oscillator is temperature compensated and is suitable for simple coil connection. The oscillator is voltage-controlled and has little distortion or spurious radiation. It is specially suitable for electronic tuning using variable capacitance diodes. Band switching diodes can easily be applied using the stabilized voltage V11-16. An extra buffered oscillator output (pin 10) is available for driving a synthesizer. If this is not needed, resistor RL(10) can be omitted. Gain-controlled i.f. amplifier This amplifier comprises two cascaded, variable-gain differential amplifier stages coupled by a band-pass filter. Both stages are gain-controlled by the a.g.c. negative feedback network. Detector The full-wave, balanced envelope detector has very low distortion over a wide dynamic range. Residual i.f. carrier is blocked from the signal path by an internal low-pass filter. A.F. preamplifier This stage preamplifies the audio frequency output signal. The amplifier output has an emitter follower with a series resistor which, together with an external capacitor, yields the required low-pass for a.f. filtering. A.G.C. amplifier The a.g.c. amplifier provides a control voltage which is proportional to the carrier amplitude. Second-order filtering of the a.g.c. voltage achieves signals with very little distortion, even at low audio frequencies. This method of filtering also gives fast a.g.c. settling time which is advantageous for electronic search tuning. The a.g.c. settling time can be further reduced by using capacitors of smaller value in the external filter (C16 and C17). The a.g.c. voltage is fed to the r.f. and i.f. stages via suitable a.g.c. delays. The capacitor at pin 7 can be omitted for low-cost applications. Field strength indicator output A buffered voltage source provides a high-level field strength output signal which has good linearity for logarithmic input signals over the whole dynamic range. If the field strength information is not needed, RL(9) can be omitted. Standby switch This switch is primarily intended for AM/FM band switching. During standby mode the oscillator, mixer and a.f. preamplifier are switched off. Short-circuit protection All pins have short-circuit protection to ground. May 1984 4 Philips Semiconductors Product specification AM receiver circuit TDA1072A RATINGS Limiting values in accordance with the Absolute Maximum Rating System (IEC 134) Supply voltage VP = V13-16 max. 20 V Total power dissipation Ptot max. 875 mW Input voltage V14-15 max. 12 V -V14-16, -V15-16 max. 0,6 V V14-16, V15-16 max. VP V Input current I14, I15 max. 200 mA Operating ambient temperature range Tamb -40 to + 80 C Storage temperature range Tstg -55 to + 150 C Junction temperature Tj max. + 125 C Rth j-a = THERMAL RESISTANCE From junction to ambient 80 K/W DEVICE CHARACTERISTICS VP = V13-16 = 8,5 V; Tamb = 25 C; fi = 1 MHz; fm = 400 Hz; m = 30%; fif = 460 kHz; measured in test circuit of Fig.1; unless otherwise specified PARAMETER SYMBOL MIN. TYP. MAX. UNIT Supplies Supply voltage VP = V13-16 7,5 8,5 18 V Supply current IP = I13 15 23 30 mA Input voltage (d.c. value) V14-16, V15-16 - VP/2 - V R.F. input impedance at Vi < 300 V R14-16, R15-16 - 5,5 - k C14-16, C15-16 - 25 - pF R14-16, R15-16 - 8 - k C14-16, C15-16 - 22 - pF R1-16 500 - - k C1-16 - 6 - pF I1/Vi - 6,5 - mA/V V1-13(p-p) - 5 - V I1 - 1,2 - mA - 30 - dB - 500 - mV R.F. stage and mixer R.F. input impedance at Vi > 10 mV I.F. output impedance Conversion transconductance before start of a.g.c. Maximum i.f. output voltage, inductive coupling to pin 1 D.C. value of output current (pin 1) at Vi = 0 V A.G.C. range of input stage R.F. signal handling capability: input voltage for THD = 3% at m = 80% May 1984 Vi(rms) 5 Philips Semiconductors Product specification AM receiver circuit TDA1072A PARAMETER SYMBOL MIN. TYP. MAX. UNIT Oscillator 0,6 - 60 MHz - 130 150 mV R12-11(ext) 0,5 - 200 k R12-11(ext) - - 60 Frequency range fosc Oscillator amplitude (pins 11 to 12) V11-12 External load impedance External load impedance for no oscillation Ripple rejection at VP(rms) = 100 mV; fP = 100 Hz RR - 55 - dB Source voltage for switching diodes (6 x VBE) V11-16 - 4,2 - V D.C. output current (for switching diodes) -I11 0 - 20 mA V11-16 - 0,5 - V V10-16 - 0,7 - V (RR = 20 log [V13-16/V11-16]) Change of output voltage at I11 = 20 mA (switch to maximum load) Buffered oscillator output D.C. output voltage Output signal amplitude V10-16(p-p) - 320 - mV Output impedance R10 - 170 - Output current -I10(peak) - - 3 mA D.C. input voltage V3-16, V4-16 - 2,0 - V I.F. input impedance R3-4 2,4 3 3,9 k C3-4 - 7 - pF V3-4 - 90 - mV V3-4/V6-16 - 68 - dB I.F., a.g.c. and a.f. stages I.F. input voltage for THD = 3% at m = 80% Voltage gain before start of a.g.c. A.G.C. range of i.f. stages: change of V3-4 for 1 dB change of Vo(af); V3-4 - 55 - dB A.F. output voltage at V3-4(if) = 50 V Vo(af) - 130 - mV A.F. output voltage at V3-4(if) = 1 mV Vo(af) - 310 - mV A.F. output impedance (pin 6) Zo - 3,5 - k V9-16 - 20 150 mV RL(9) = 2,7 k V9-16 2,5 2,8 3,1 V Load resistance RL(9) 1,5 - - k V3-4(ref) = 75 mV Indicator driver Output voltage at Vi = 0 mV; RL(9) = 2,7 k Output voltage at Vi = 500 mV; May 1984 6 Philips Semiconductors Product specification AM receiver circuit TDA1072A PARAMETER SYMBOL MIN. TYP. MAX. UNIT 2,0 V Standby switch Switching threshold at VP = 7,5 to 18 V; Tamb = -40 to + 80 C on-voltage V2-16 0 - off-voltage V2-16 3,5 - 20 V on-current at V2-16 = 0 V -I2 - - 200 A off-current at V2-16 = 20 V I2 - - 10 A OPERATING CHARACTERISTICS VP = 8,5 V; fi = 1 MHz; m = 30%; fm = 400 Hz; Tamb = 25 C; measured in Fig.1; unless otherwise specified PARAMETER SYMBOL MIN. TYP. MAX. UNIT R.F. sensitivity R.F. input required for S + N/N = 6 dB Vi - 1,5 - V R.F. input required for S + N/N = 26 dB Vi - 15 - V R.F. input required for S + N/N = 46 dB Vi - 150 - V R.F. input at start of a.g.c. Vi - 30 - V R.F. large signal handling R.F. input at THD = 3%; m = 80% Vi - 500 - mV R.F. input at THD = 3%; m = 30% Vi - 700 - mV R.F. input at THD = 10%; m = 30% Vi - 900 - mV Vi - 86 - dB Vi - 91 - dB Vo(af) - 130 - mV Vo(af) 240 310 390 mV A.G.C. range Change of Vi for 1 dB change of Vo(af); Vi(ref) = 500 mV Change of Vi for 6 dB change of Vo(af); Vi(ref) = 500 mV Output signal A.F. output voltage at Vi = 4 V; m = 80% A.F. output voltage at Vi = 1 mV THD at Vi = 1 mV; m = 80% dtot - 0,5 - % THD at Vi = 500 mV; m = 30% dtot - 1 - % Signal-to-noise ratio at Vi = 100 mV (S + N)/N - 58 - dB RR - 38 - dB Ripple rejection at Vi = 2 mV; VP(rms) = 100 mV; fP = 100 Hz (RR = 20 log [VP/Vo(af)]) May 1984 7 Philips Semiconductors Product specification AM receiver circuit TDA1072A PARAMETER SYMBOL MIN. TYP. MAX. UNIT Unwanted signals Suppression of i.f. whistles at Vi = 15 V; m = 0% related to a.f. signal of m = 30% at fi 2 x fif 2if - 37 - dB at fi 3 x fif 3if - 44 - dB for symmetrical input if - 40 - dB for asymmetrical input if - 40 - dB at fosc I1(osc) - 1 - A at 2 x fosc I1(2osc) - 1,1 - A I.F. suppression at r.f. input Residual oscillator signal at mixer output APPLICATION INFORMATION (1) Capacitor values depend on crystal type. (2) Coil data: 9 windings of 0,1 mm dia laminated Cu wire on TOKO coil set 7K 199CN; Qo = 80. Fig.2 Oscillator circuit using quartz crystal; centre frequency = 27 MHz. May 1984 8 Philips Semiconductors Product specification AM receiver circuit TDA1072A Fig.4 Fig.3 A.F. output as a function of r.f. input in the circuit of Fig.1; fi = 1 MHz; fm = 400 Hz; m = 30%. Fig.5 May 1984 Total harmonic distortion and (S + N)/N as functions of r.f. input in the circuit of Fig.1; m = 30% for (S + N)/N curve and m = 80% for THD curve. Total harmonic distortion as a function of modulation frequency at Vi = 5 mV; m = 80%; measured in the circuit of Fig.1 with C7-16(ext) = 0 F and 2,2 F. 9 Philips Semiconductors Product specification AM receiver circuit TDA1072A Fig.7 Fig.6 Indicator driver voltage as a function of r.f. input in the circuit of Fig.1. Typical frequency response curves from Fig.1 showing the effect of filtering as follows: with i.f. filter; - - - - - - with a.f. filter; - - - - - with i.f. and a.f. filters. Fig.8 Car radio application with inductive tuning. May 1984 10 Philips Semiconductors Product specification AM receiver circuit TDA1072A Fig.9 A.F. output as a function of r.f. input using the circuit of Fig.8 with that of Fig.1. Fig.10 Suppression of cross-modulation as a function of input signal, measured in the circuit of Fig.8 with the input circuit as shown in Fig.11. Curve is for Wanted Vo(af)/Unwanted Vo(af) = 20 dB; Vrfw, Vrfu are signals at the aerial input, V'aew, V'aeu are signals at the unloaded output of the aerial. Wanted signal (V'aew, Vrfw): fi = 1 MHz; fm = 400 Hz; m = 30%. Unwanted signal (V'aeu, Vrfu): fi = 900 kHz; fm = 400 Hz; m = 30%. Effective selectivity of input tuned circuit = 21 dB. May 1984 11 Philips Semiconductors Product specification AM receiver circuit TDA1072A Fig.11 Input circuit to show cross-modulation suppression (see Fig.10). Fig.12 Oscillator amplitude as a function of pin 11, 12 impedance in the circuit of Fig.8. May 1984 12 Philips Semiconductors Product specification AM receiver circuit TDA1072A Fig.13 Total harmonic distortion and (S + N)/N as functions of r.f. input using the circuit of Fig.8 with that of Fig.1. Fig.14 Forward transfer impedance as a function of intermediate frequency for filters 1 to 4 shown in Fig.15; centre frequency = 455 kHz. May 1984 13 Philips Semiconductors Product specification AM receiver circuit TDA1072A Fig.15 I.F. filter variants applied to the circuit of Fig.1. For filter data, refer to Table 1. May 1984 14 May 1984 15 SFZ455A 4 3 4,2 24 D (typical value) RG, RL Bandwidth (-3 dB) S9kHz 66 33 40 0,67 3,8 31 49 58 57 0,70 3,6 35 52 63 QB ZF Bandwidth (-3 dB) S9kHz S18kHz S27kHz 15 31 52 (L1) 66 54 36 3,6 0,68 4,2 24 4,2 3 4 SFZ455A 7XNS-A7518DY 75 0,09 3 29 (N2) 29 18 (L2) 7XNS-A7521AIH (N1) 60 0,08 29 : 29 4700 L2 13 31 74 64 42 4,0 0,68 55 4,8 38 4,5 3 6 SFT455B 7XNS-A7519DY 75 0,09 13 : 31 3900 L1 4 dB dB dB kHz k k dB kHz k dB mm pF UNIT AM receiver circuit * The beginning of an arrow indicates the beginning of a winding; N1 is always the inner winding, N2 the outer winding. 3,8 4,8 24 4,2 3 4 SFZ455A L7PES-A0060BTG 13 ZI Filter data 32 7XNS-A7523DY 12 50 65 (typ.) Murata type Resonators Toko order no. Schematic* of windings Qo laminated wire 15 : 31 13 : (33 + 66) 0,08 12 : 32 N1: N2 L1 3900 2 430 L1 0,09 3900 Value of C Diameter of Cu L1 Coil data 1 Data for I.F. filters shown in Fig.15. Criterium for adjustment is ZF = maximum (optimum selectivity curve at centre frequency f0 = 455 kHz). See also Fig.14. FILTER NO. Table 1 Philips Semiconductors Product specification TDA1072A Philips Semiconductors Product specification AM receiver circuit TDA1072A Fig.16 Printed-circuit board component side, showing component layout. For circuit diagram see Fig.1. May 1984 16 Philips Semiconductors Product specification AM receiver circuit TDA1072A Fig.17 Printed-circuit board showing track side. May 1984 17 AM receiver circuit May 1984 18 Fig.18 Car radio application with capacitive diode tuning and electronic MW/LW switching. The circuit includes pre-stage a.g.c. optimized for good large-signal handling. (1) Values of capacitors depend on the selected group of capacitive diodes BB112. (2) For i.f. filter and coil data refer to Fig.1. Philips Semiconductors Product specification TDA1072A Philips Semiconductors Product specification AM receiver circuit TDA1072A PACKAGE OUTLINE DIP16: plastic dual in-line package; 16 leads (300 mil); long body SOT38-1 ME seating plane D A2 A A1 L c e Z b1 w M (e 1) b MH 9 16 pin 1 index E 1 8 0 5 10 mm scale DIMENSIONS (inch dimensions are derived from the original mm dimensions) UNIT A max. A1 min. A2 max. b b1 c D (1) E (1) e e1 L ME MH w Z (1) max. mm 4.7 0.51 3.7 1.40 1.14 0.53 0.38 0.32 0.23 21.8 21.4 6.48 6.20 2.54 7.62 3.9 3.4 8.25 7.80 9.5 8.3 0.254 2.2 inches 0.19 0.020 0.15 0.055 0.045 0.021 0.015 0.013 0.009 0.86 0.84 0.26 0.24 0.10 0.30 0.15 0.13 0.32 0.31 0.37 0.33 0.01 0.087 Note 1. Plastic or metal protrusions of 0.25 mm maximum per side are not included. REFERENCES OUTLINE VERSION IEC JEDEC SOT38-1 050G09 MO-001AE May 1984 EIAJ EUROPEAN PROJECTION ISSUE DATE 92-10-02 95-01-19 19 Philips Semiconductors Product specification AM receiver circuit TDA1072A SOLDERING Introduction There is no soldering method that is ideal for all IC packages. Wave soldering is often preferred when through-hole and surface mounted components are mixed on one printed-circuit board. However, wave soldering is not always suitable for surface mounted ICs, or for printed-circuits with high population densities. In these situations reflow soldering is often used. This text gives a very brief insight to a complex technology. A more in-depth account of soldering ICs can be found in our "IC Package Databook" (order code 9398 652 90011). Soldering by dipping or by wave The maximum permissible temperature of the solder is 260 C; solder at this temperature must not be in contact with the joint for more than 5 seconds. The total contact time of successive solder waves must not exceed 5 seconds. The device may be mounted up to the seating plane, but the temperature of the plastic body must not exceed the specified maximum storage temperature (Tstg max). If the printed-circuit board has been pre-heated, forced cooling may be necessary immediately after soldering to keep the temperature within the permissible limit. Repairing soldered joints Apply a low voltage soldering iron (less than 24 V) to the lead(s) of the package, below the seating plane or not more than 2 mm above it. If the temperature of the soldering iron bit is less than 300 C it may remain in contact for up to 10 seconds. If the bit temperature is between 300 and 400 C, contact may be up to 5 seconds. DEFINITIONS Data sheet status Objective specification This data sheet contains target or goal specifications for product development. Preliminary specification This data sheet contains preliminary data; supplementary data may be published later. Product specification This data sheet contains final product specifications. Limiting values Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability. Application information Where application information is given, it is advisory and does not form part of the specification. LIFE SUPPORT APPLICATIONS These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such improper use or sale. May 1984 20