NJM2781RB1

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. 1µA 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 I ABSOLUTE MAXIMUM RATING (Ta=25°C) PARAMETER SYMBOL Supply Voltage Power Dissipation Operating Temperature Range Storage Temperature Range V + RATING 5 TVSP8:320, SSOP8:250 -40 to 85 -40 to 125 UNIT V mW °C °C PD Topr Tstg I ELECTRICAL CHARACTERISTICS + (Ta=25°C,V =2.8V,Vin=-40dBV, f=1kHz,RL=9kΩ) 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=6.8kΩ 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 µA mA V UNIT V dB dBV (Vrms) % dBV (µVrms) 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=600Ω, A-Weighted Rg=600Ω, 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– NJM2781 I TEST CIRCUIT Test Circuit 1 (Voltage Gain Gv, Maximum Output Voltage VOM, Total Harmonic Distortion THD) 1µF 1 2 100Ω NOISE GND 8 7 6 5 4.7µF 680Ω 47kΩ 2.2µF GND V+ Output 9kΩ [THD] BPF:400 to 22kHz 10µF REG Reg V+ 10µF STBY 3 4 0.33µF IN+ OUT Input 6.8kΩ IN- 15kΩ V+ Test Circuit 2 (DC Output Voltage VO, Output Noise VNO) 1µF NOISE 1 2 100Ω GND 8 7 6 5 4.7µF 680Ω 47kΩ 15kΩ GND V+ 2.2µF 10µF REG Reg V+ 10µF STBY 3 4 0.33µF IN+ OUT Output 9kΩ [VNO] A-Weighted Input 6.8kΩ IN- V+ Rg=600Ω –3– NJM2781 Test Circuit 3 (Operating Current Icc1,Icc2) 1µF 1 2 100Ω NOISE GND 8 7 6 5 4.7µF 680Ω 47kΩ GND V+ 10µF REG Reg V+ 10µF STBY 3 4 0.33µF IN+ OUT 2.2µF Output Input 6.8kΩ IN- 15kΩ 9kΩ V+ Icc1:STBY=L Icc2:STBY=H Test Circuit 4 (Mic Power Supply Voltage Vo) 1µF NOISE 1 2 GND 8 7 6 5 4.7µF 680Ω 47kΩ 2.2µF GND V+ Output 9kΩ 6.8kΩ 10µF 10µF 6.8kΩ 100Ω REG Reg V+ STBY 3 4 OUT Input 0.33µF ININ+ 15kΩ V+ –4– NJM2781 Test Circuit 5 (Power Supply Ripple Rejection PSRR) 1µF NOISE 1 10µF GND 8 7 6 5 4.7µF 680Ω 47kΩ GND V+ REG 2 100Ω 10µF STBY Reg V+ 3 4 0.33µF IN+ OUT 2.2µF Output Input 6.8kΩ IN- 15kΩ 9kΩ [PSRR] BPF:1kHz V+ Rg=600Ω Test Circuit 6 (Stand-By Control Voltage VIH, VIL) 1µF NOISE 1 10µF GND 8 7 6 5 4.7µF 680Ω 47kΩ 2.2µF GND V+ Output REG 2 100Ω 10µF STBY Reg V+ 3 4 0.33µF IN+ OUT Input 6.8kΩ IN- 15kΩ 9kΩ –5– NJM2781 I APPLICATION CIRCUIT 1µF 1 2 100Ω NOISE GND 8 7 6 5 4.7µF 680Ω 47kΩ 2.2µF GND V+ Output 10µF REG Reg V+ 10µF STBY 3 4 0.33µF IN+ OUT Input 6.8kΩ IN- 15kΩ 9kΩ V+ –6– NJM2781 I TERMINAL DESCRIPTION PIN NO. 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. 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– NJM2781 I SPECIFICATIONS Operating Current vs. Pow er Supply Voltage (Standby) RL=9kΩ,Ta=25°C 1 0.8 0.6 Operating Current [µA] Operating Current vs. Ambient Temperature (Standby) V+=2.8V,RL=9kΩ 1 0.8 0.6 Operating Current [µA] 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=9kΩ,Ta=25°C 2.5 2.5 2 Operating Current [mA] Operating Current vs. Ambient Temperature (Active) V+=2.8V,RL=9kΩ 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=9kΩ,Ta=25°C 0 -20 Output Voltage [dBV] V+=2.8V,RL=9kΩ,Ta=25°C 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 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=6.8kΩ 3 2.5 Mic Power Supply Voltage [V] 2 1.5 1 0.5 0 -0.5 -40 RL=6.8kΩTa=25°C 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=9kΩ,Ta=25°C 30 Voltage Gain vs. Ambient Temperature V+=2.8V,Vin=-40dBV,f=1kHz,RL=9kΩ 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=9kΩ,Rg=600Ω,A-w eighted 110 Votage Gain vs. Standby Voltage (Ta) V+=2.8V,Vin=-40dBV,f=1kHz,RL=9kΩ -80 -85 -90 Ta=85°C Ta=-40°C 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=25°C 10 60 Ambient Temperature [°C] 110 – 10 – NJM2781 Total Harmonic Distortion vs. Output Voltage (V+) Vin=-40dBV,RL=9kΩ,Ta=25°C 10 Total Harmonic Distortion vs. Output Voltage (Ta) V+=2.8V,f=1kHz,RL=9kΩ 10 1 V+=2.7V V+=2.8V V+=4.5V THD+N ％] [ 1 Ta=-40°C Ta= 25°C Ta= 85°C 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=9kΩ,Ta=25°C 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=9kΩ,Ta=25°C 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 –