NJM2781 Monaural Microphone Amplifier PACKAGE OUTLINE GENERAL DESCRIPTION The NJM2781 is a monaural microphone amplifier IC with a standby function, and can vary a voltage gain by adjusting an external resistor. Since the NJM2781 operates with a low voltage range of +2.7V to +4.5V and is available in tiny packages of MSOP8(TVSP8)* and SSOP8, it is ideally suited for portable and handheld components. NJM2781RB1 MSOP8(TVSP8) NJM2781V ( SSOP8 ) FEATURES Operating Voltage Operating Current +2.7V to +4.5 V 1.8mA typ. 1A max. (in Standby mode) Bipolar Technology Package Outline MSOP8(TVSP8) * SSOP8 *MEET JEDEC MO-187-DA / THIN TYPE BLOCK DIAGRAM NOISE 1 GND 8 V+ 7 REG 2 Reg STBY OUT 3 4 IN+ IN- 6 5 PIN FUNCTION 1 4 8 5 No. SYMBOL FUNCTION No. SYMBOL FUNCTION 1 NOISE Noise Bypass 5 IN- Inverted Input 2 REG Regulator Output 6 OUT Output 3 STBY Standby On/Off 7 V+ Power Supply 4 IN+ Non-Inverted Input 8 GND Ground -1- NJM2781 ABSOLUTE MAXIMUM RATING (Ta=25C) PARAMETER SYMBOL + RATING UNIT Supply Voltage V 5 V Power Dissipation PD MSOP8(TVSP8):320, SSOP8:250 mW Operating Temperature Range Topr -40 to 85 C Storage Temperature Range Tstg -40 to 125 C ELECTRICAL CHARACTERISTICS + (Ta=25C,V =2.8V,Vin=-40dBV, f=1kHz,RL=9k) Power Supply PARAMETER SYMBOL TEST CONDITION Operating Voltage V Operating Current 1 Icc1 No signal, Standby Operating Current 2 Icc2 No signal, Active Mic Power Supply Voltage Vo + RL=6.8k MIN. TYP. MAX. UNIT 2.7 2.8 4.5 V - 1 A 1.8 4 mA 2.3 2.42 2.54 V MIN. TYP. MAX. UNIT 1.28 1.35 1.42 V 24 -2.7 (0.73) 25 -1.5 (0.84) 26 dB dBV (Vrms) - 0.025 0.1 % - -98 (12.6) -90 (31.6) dBV (Vrms) 65 80 - dB MIN. TYP. MAX. UNIT Amplifier PARAMETER SYMBOL Output Voltage Vo Voltage Gain GV Test Circuit 1 Maximum Output Voltage VOM THD=0.1% Total Harmonic Distortion (THD+N) THD Output Noise VNO Power Supply Ripple Rejection Control PSRR PARAMETER SYMBOL TEST CONDITION Rg=600, A-Weighted Rg=600, Vripple=-20dBV TEST CONDITION - + High Level Input Voltage VIH STBY terminal 2 - V V Low Level Input Voltage VIL STBY terminal 0 - 0.5 V Standby Mode Operation -2- Status Control Terminal STBY IC Condition Active H IC active Standby L, OPEN IC standby NJM2781 TEST CIRCUIT Test Circuit 1 (Voltage Gain Gv, Maximum Output Voltage VOM, Total Harmonic Distortion THD) 1F 8 GND V+ 7 V+ 3 OUT 6 4 IN- 5 REG 10F 2 100 10F Input 6.8k V+ NOISE GND 1 Reg STBY IN+ 0.33F 2.2F 47k 15k Output 9k [THD] BPF:400 to 22kHz 4.7F 680 Test Circuit 2 (DC Output Voltage VO, Output Noise VNO) 1F 1 REG 10F 2 100 10F Input NOISE STBY 3 6.8k V+ 4 0.33F IN+ Reg GND 8 GND V+ 7 V+ OUT 6 IN- 5 47k 15k 2.2F Output 9k 4.7F 680 [VNO] A-Weighted Rg=600 -3- NJM2781 Test Circuit 3 (Operating Current Icc1,Icc2) 1F 8 V+ 7 3 OUT 6 4 IN- 5 REG 10F 2 100 10F 6.8k Input V+ NOISE GND 1 Reg STBY IN+ 0.33F GND V+ 47k 2.2F 15k Output 9k 4.7F 680 Icc1:STBY=L Icc2:STBY=H Test Circuit 4 (Mic Power Supply Voltage Vo) 1F 8 GND V+ 7 V+ 3 OUT 6 4 IN- 5 REG 6.8k 2 10F 100 10F 6.8k Input 0.33F V+ -4- NOISE GND 1 STBY IN+ Reg 47k 2.2F 15k 4.7F 680 Output 9k NJM2781 Test Circuit 5 (Power Supply Ripple Rejection PSRR) 1F 1 NOISE REG 10F 2 100 10F Input Reg STBY 3 6.8k 4 V+ GND 8 V+ 7 OUT 6 IN- 5 IN+ 0.33F GND V+ 47k 2.2F 15k Output 9k [PSRR] BPF:1kHz 4.7F 680 Rg=600 Test Circuit 6 (Stand-By Control Voltage VIH, VIL) 1F 1 NOISE REG 10F 2 100 10F Input STBY 3 6.8k 4 0.33F IN+ Reg GND 8 GND V+ 7 V+ OUT 6 IN- 5 47k 2.2F 15k Output 9k 4.7F 680 -5- NJM2781 APPLICATION CIRCUIT 1F 1 REG 10F 2 100 10F Input STBY 3 6.8k V+ -6- NOISE 4 0.33F IN+ Reg GND 8 GND V+ 7 V+ OUT 6 IN- 5 47k 2.2F 15k 4.7F 680 9k Output NJM2781 TERMINAL DESCRIPTION PIN NO. SYMBOL 1 NOISE FUNCTION TERMINAL VOLTAGE EQUIVALENT CIRCUIT Noise Bypass V+ V+ V+ V+ 3.6k 0.54V NOISE 500 27k 2 REG Regulator Output V+ V+ V+ 8k REG 3 STBY 2.42V Standby On/Off V+ V+ STBY 460 30k 0V 30k 4 IN+ Non-Inverted Input V+ REG 48k 1.35V IN+ 76k 60k -7- NJM2781 TERMINAL DESCRIPTION PIN NO. SYMBOL 5 IN- FUNCTION TERMINAL VOLTAGE EQUIVALENT CIRCUIT Inverted Input V+ 1.35V IN- 6 OUT Output V+ V+ 300 OUT 16p -8- 1.35V NJM2781 TYPICAL CHARACTERISTICS Operating Current vs. Ambient Temperature (Standby) Operating Current vs. Pow er Supply Voltage (Standby) RL=9k,Ta=25C 0.8 0.8 0.6 0.6 0.4 0.4 0.2 0 -0.2 -0.4 0.2 0 -0.2 -0.4 -0.6 -0.6 -0.8 -0.8 -1 0 1 V+=2.8V,RL=9k 1 Operating Current [A] Operating Current [A] 1 2 3 Pow er Supply Voltage [V] 4 -1 -40 5 Operating Current vs. Pow er Supply Voltage (Active) 10 60 Ambient Teperature [C] Operating Current vs. Ambient Temperature (Active) V+=2.8V,RL=9k 2.5 2.5 2 2 Operating Current [mA] Operating Current [mA] RL=9k,Ta=25C 1.5 1 0.5 1.5 1 0.5 0 0 -0.5 -40 -0.5 0 1 2 3 Pow er Supply Voltage [V] 4 5 Operating Current vs. Standby Voltage 10 60 Ambient Temperature [C] 110 Output Voltage vs. Input Voltage (Standby) V+=2.8V,RL=9k,Ta=25C 2.5 f=1kHz,RL=9k,Ta=25C 0 2 -20 1.5 Output Voltage [dBV] Operating Current [mA] 110 1 0.5 0 -40 -60 -80 -100 -120 -0.5 0 0.5 1 1.5 2 Standby Voltage [V] 2.5 3 -140 -40 -30 -20 -10 Input Voltage [dBV] 0 -9- NJM2781 TYPICAL CHARACTERISTICS Mic Pow er Supply Voltage vs. Pow er Supply Voltage Mic Pow er Supply Voltage vs. Ambient Temperature RL=6.8kTa=25C 3 V+=2.8V,RL=6.8k 3 2.5 Mic Power Supply Voltage [V] Mic Power Supply Voltage [V] 2.5 2 1.5 1 0.5 0 2 1.5 1 0.5 0 -0.5 0 1 2 3 Pow er Supply Voltage [V] -0.5 -40 4 110 Voltage Gain vs. Ambient Temperature Voltage Gain vs. Frequency V+=2.8V,Vin=-40dBV,f=1kHz,RL=9k V+=2.8V,Vin=-40dBV,RL=9k,Ta=25C 30 30 28 28 Voltage Gain [dB] Voltage Gain [dB] 10 60 Ambient Temperature [C] 26 24 26 24 22 22 20 10 10E+0 100 100E+0 1k 1E+3 10k 10E+3 100k 100E+3 20 -40 Frequency [Hz] Votage Gain vs. Standby Voltage (Ta) V+=2.8V,RL=9k,Rg=600,A-w eighted -80 20 -85 0 -90 -20 Output Noise [dBV] Voltage Gain [dB] 110 Output Noise vs. Ambient Temperature V+=2.8V,Vin=-40dBV,f=1kHz,RL=9k 40 10 60 Ambient Temperature [C] Ta=-40C Ta=85C -40 Ta=25C -60 -80 -95 -100 -105 -110 -100 -115 -120 0 - 10 - 0.5 1 1.5 2 Standby Voltage [V] 2.5 3 -120 -40 10 60 Ambient Temperature [C] 110 NJM2781 TYPICAL CHARACTERISTICS Total Harmonic Distortion vs. Output Voltage (V+) Total Harmonic Distortion vs. Output Voltage (Ta) Vin=-40dBV,RL=9k,Ta=25C V+=2.7V V+=2.8V V+=4.5V 1 THD+N [ ] THD+N [ ] 1 0.1 Ta=-40C Ta= 25C Ta= 85C 0.1 0.01 0.01 0.001 -35 -25 -15 Output Voltage [dBV] -5 5 0.001 -35 -15 -5 5 Pow er Supply Ripple Rejection vs. Frequency V+=2.8V,RL=9k,Ta=25C 10 100 f=100Hz : BW= 10-22kHz f=1kHz : BW=400-22kHz f=10kHz : BW=400-80kHz V+=2.8V,Vin=-40dBV,RL=9k,Ta=25C 80 1 PSRR [dB] f=10kHz 0.1 0.01 -25 Output Voltage [dBV] Total Harmonic Distortion vs. Output Voltage ( f ) THD+N [ ] V+=2.8V,f=1kHz,RL=9k 10 10 f=100Hz 60 40 20 f=1kHz 0.001 -35 -25 -15 Output Voltage [dBV] -5 5 0 10 10E+0 100 100E+0 1k 1E+3 Frequency [Hz] 10k 10E+3 100k 100E+3 [CAUTION] The specifications on this data book are only given for information, without any guarantee as regards either mistakes or omissions. The application circuits in this data book are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights. - 11 - Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: NJR: NJM2781V-TE1 NJM2781RB1-TE2 NJM2781RB1-TE1