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| PRELIMINARY NJM2781 Monaural Microphone Amplifier I GENERAL DESCRIPTION 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 TVSP8 and SSOP8, it is ideally suited for portable and handheld components. I PACKAGE OUTLINE NJM2781RB1 NJM2781V I FEATURES G Operating Voltage G Operating Current G Bipolar Technology G Package Outline I BLOCK DIAGRAM +2.7V to +4.5 V 1.8mA typ. 1A max. (in Standby mode) TVSP8, SSOP8 NOISE 1 REG GND 8 7 6 5 2 STBY Reg V+ 3 4 OUT IN+ IN- I PIN FUNCTION No. 1 8 1 2 4 5 3 4 SYMBOL NOISE REG STBY IN+ FUNCTION Noise Bypass Regulator Output Standby On/Off Non-Inverted Input No. 5 6 7 8 SYMBOL INOUT V+ GND FUNCTION Inverted Input Output Power Supply Ground -1- NJM2781 PRELIMINARY I ABSOLUTE MAXIMUM RATING (Ta=25C) PARAMETER SYMBOL Supply Voltage Power Dissipation Operating Temperature Range Storage Temperature Range V + RATING 5 TVSP8:320, SSOP8:250 -20 to 75 -40 to 125 UNIT V mW C C PD Topr Tstg I ELECTRICAL CHARACTERISTICS + (Ta=25C,V =2.8V,Vin=-40dBV, f=1kHz,RL=9k) GPower Supply PARAMETER Operating Voltage Operating Current 1 Operating Current 2 Mic Power Supply Voltage GAmplifier PARAMETER Output Voltage Voltage Gain Maximum Output Voltage Total Harmonic Distortion (THD+N) Output Noise Power Supply Ripple Rejection GControl PARAMETER High Level Input Voltage Low Level Input Voltage IStandby Mode Operation Status Control Terminal STBY SYMBOL V + TEST CONDITION No signal, Standby No signal, Active RL=6.8k TEST CONDITION Test Circuit 1 THD=0.1% MIN. 2.7 TYP. 2.8 1.8 MAX. 4.5 1 4 2.54 MAX. 1.42 26 0.1 -90 (31.6) MAX. V + UNIT V A mA V UNIT V dB dBV (Vrms) % dBV (Vrms) dB UNIT V V Icc1 Icc2 Vo SYMBOL Vo GV VOM THD VNO PSRR SYMBOL VIH VIL 2.3 MIN. 1.28 24 -2.7 (0.73) - 2.42 TYP. 1.35 25 -1.5 (0.84) 0.025 -98 (12.6) 80 TYP. - Rg=600, A-Weighted Rg=600, Vripple=-20dBV TEST CONDITION STBY terminal STBY terminal 65 MIN. 2 0 0.5 IC Condition Active Standby H L, OPEN IC active IC standby -2- PRELIMINARY I TEST CIRCUIT NJM2781 Test Circuit 1 (Voltage Gain Gv, Maximum Output Voltage VOM, Total Harmonic Distortion THD) 1F 1 2 100 NOISE GND 8 7 6 5 4.7F 680 47k 2.2F GND V+ Output 9k [THD] BPF:400 to 22kHz 10F REG Reg V+ 10F STBY 3 4 0.33F IN+ OUT Input 6.8k IN- 15k V+ Test Circuit 2 (DC Output Voltage VO, Output Noise VNO) 1F NOISE 1 2 100 GND 8 7 6 5 4.7F 680 47k 15k GND V+ 2.2F 10F REG Reg V+ 10F STBY 3 4 0.33F IN+ OUT Output 9k [VNO] A-Weighted Input 6.8k IN- V+ Rg=600 -3- NJM2781 PRELIMINARY Test Circuit 3 (Operating Current Icc1,Icc2) 1F 1 2 100 NOISE GND 8 7 6 5 4.7F 680 47k GND V+ 10F REG Reg V+ 10F STBY 3 4 0.33F IN+ OUT 2.2F Output Input 6.8k IN- 15k 9k V+ Icc1:STBY=L Icc2:STBY=H Test Circuit 4 (Mic Power Supply Voltage Vo) 1F NOISE 1 2 GND 8 7 6 5 4.7F 680 47k 2.2F GND V+ Output 9k 6.8k 10F 10F 6.8k 100 REG Reg V+ STBY 3 4 OUT Input 0.33F ININ+ 15k V+ -4- PRELIMINARY Test Circuit 5 (Power Supply Ripple Rejection PSRR) 1F NOISE NJM2781 1 10F GND 8 7 6 5 4.7F 680 47k GND V+ REG 2 100 10F STBY Reg V+ 3 4 0.33F IN+ OUT 2.2F Output Input 6.8k IN- 15k 9k [PSRR] BPF:1kHz V+ Rg=600 Test Circuit 6 (Stand-By Control Voltage VIH, VIL) 1F NOISE 1 10F GND 8 7 6 5 4.7F 680 47k 2.2F GND V+ Output REG 2 100 10F STBY Reg V+ 3 4 0.33F IN+ OUT Input 6.8k IN- 15k 9k -5- NJM2781 I APPLICATION CIRCUIT PRELIMINARY 1F 1 2 100 NOISE GND 8 7 6 5 4.7F 680 47k 2.2F GND V+ Output 10F REG Reg V+ 10F STBY 3 4 0.33F IN+ OUT Input 6.8k IN- 15k 9k V+ -6- PRELIMINARY I TERMINAL DESCRIPTION PIN NO. NJM2781 SYMBOL FUNCTION EQUIVALENT CIRCUIT V+ V+ V+ V+ TERMINAL VOLTAGE 1 NOISE Noise Bypass 3.6k NOISE 27k 500 0.54V 2 REG Regulator Output V+ 8k V+ V+ REG 2.42V 3 STBY Standby On/Off V+ V+ STBY 460 30k 0V 30k 4 IN+ Non-Inverted Input V+ 48k IN+ REG 1.35V 76k 60k -7- NJM2781 I TERMINAL DESCRIPTION PIN NO. PRELIMINARY SYMBOL FUNCTION EQUIVALENT CIRCUIT TERMINAL VOLTAGE 5 IN- Inverted Input V+ IN- 1.35V 6 OUT Output V+ 300 OUT 16p V+ 1.35V -8- PRELIMINARY I SPECIFICATIONS Operating Current vs. Pow er Supply Voltage (Standby) RL=9k,Ta=25C 1 0.8 0.6 Operating Current [A] NJM2781 Operating Current vs. Ambient Temperature (Standby) V+=2.8V,RL=9k 1 0.8 0.6 Operating Current [A] 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1 0 1 2 3 Pow er Supply Voltage [V] 4 5 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1 -40 10 60 Ambient Teperature [C] 110 Operating Current vs. Pow er Supply Voltage (Active) RL=9k,Ta=25C 2.5 2.5 2 Operating Current [mA] Operating Current vs. Ambient Temperature (Active) V+=2.8V,RL=9k 2 Operating Current [mA] 1.5 1.5 1 0.5 0 -0.5 -40 1 0.5 0 -0.5 0 1 2 3 Pow er Supply Voltage [V] 4 5 10 60 Ambient Temperature [C] 110 Operating Current vs. Standby Voltage 2.5 2 Operating Current [mA] Output Voltage vs. Input Voltage (Standby) f=1kHz,RL=9k,Ta=25C 0 -20 Output Voltage [dBV] V+=2.8V,RL=9k,Ta=25C 1.5 1 0.5 -40 -60 -80 -100 -120 -140 -40 0 -0.5 0 0.5 1 1.5 2 2.5 3 Standby Voltage [V] -30 -20 -10 Input Voltage [dBV] 0 -9- NJM2781 PRELIMINARY Mic Pow er Supply Voltage vs. Pow er Supply Voltage 3 2.5 Mic Power Supply Voltage [V] Mic Pow er Supply Voltage vs. Ambient Temperature V+=2.8V,RL=6.8k 3 2.5 Mic Power Supply Voltage [V] 2 1.5 1 0.5 0 -0.5 -40 RL=6.8kTa=25C 2 1.5 1 0.5 0 -0.5 0 1 2 3 Pow er Supply Voltage [V] 4 10 60 Ambient Temperature [C] 110 Voltage Gain vs. Frequency V+=2.8V,Vin=-40dBV,RL=9k,Ta=25C 30 Voltage Gain vs. Ambient Temperature V+=2.8V,Vin=-40dBV,f=1kHz,RL=9k 30 28 Voltage Gain [dB] 28 Voltage Gain [dB] 26 26 24 24 22 22 20 10 10E+0 100 100E+0 1k 1E+3 Frequency [Hz] 10k 10E+3 100k 100E+3 20 -40 10 60 Ambient Temperature [C] Output Noise vs. Ambient Temperature V+=2.8V,RL=9k,Rg=600,A-w eighted 110 Votage Gain vs. Standby Voltage (Ta) V+=2.8V,Vin=-40dBV,f=1kHz,RL=9k -80 -85 -90 Ta=85C Ta=-40C Output Noise [dBV] 3 -95 -100 -105 -110 -100 -115 -120 0 0.5 1 1.5 2 Standby Voltage [V] 2.5 -120 -40 40 20 0 Voltage Gain [dB] -20 -40 -60 -80 Ta=25C 10 60 Ambient Temperature [C] 110 - 10 - PRELIMINARY NJM2781 Total Harmonic Distortion vs. Output Voltage (V+) Vin=-40dBV,RL=9k,Ta=25C 10 Total Harmonic Distortion vs. Output Voltage (Ta) V+=2.8V,f=1kHz,RL=9k 10 1 V+=2.7V V+=2.8V V+=4.5V THD+N ] [ 1 Ta=-40C Ta= 25C Ta= 85C THD+N ] [ 0.1 0.1 0.01 0.01 0.001 -35 -25 -15 Output Voltage [dBV] -5 5 0.001 -35 -25 -15 Output Voltage [dBV] -5 5 Total Harmonic Distortion vs. Output Voltage ( f ) V+=2.8V,RL=9k,Ta=25C f=100Hz : BW= 10-22kHz f=1kHz : BW=400-22kHz f=10kHz : BW=400-80kHz 1 f=10kHz 0.1 100 Pow er Supply Ripple Rejection vs. Frequency V+=2.8V,Vin=-40dBV,RL=9k,Ta=25C 10 80 THD+N ] [ PSRR [dB] 60 40 0.01 f=100Hz f=1kHz 20 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 - |
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