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. NJM2781RB1 NJM2781V Since the NJM2781 operates with a low voltage range of +2.7V to MSOP8(TVSP8) ( SSOP8 ) +4.5V and is available in tiny packages of MSOP8(TVSP8)* and SSOP8, it is ideally suited for portable and handheld components. FEATURES Operating Voltage +2.7V to +4.5 V Operating Current 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 GND 1 8 REG V+ 2 Reg 7 STBY OUT 3 6 4 5 IN+ IN- PIN FUNCTION No. SYMBOL FUNCTION No.SYMBOL FUNCTION 1 8 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 5 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 P MSOP8(TVSP8):320, SSOP8:250 mW D 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,R =9k) L Power Supply PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX.UNIT + Operating Voltage V 2.7 2.8 4.5 V Operating Current 1 Icc1 No signal, Standby - 1 A Operating Current 2 Icc2 No signal, Active 1.8 4 mA Mic Power Supply Voltage Vo RL=6.8k 2.3 2.42 2.54 V Amplifier PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX.UNIT Output Voltage Vo 1.28 1.35 1.42 V Voltage Gain G Test Circuit 1 24 25 26 dB V -2.7 -1.5 dBV Maximum Output Voltage V THD=0.1% - OM (0.73) (0.84) (Vrms) Total Harmonic Distortion THD - 0.025 0.1 % (THD+N) -98 -90 dBV Output Noise V Rg=600, A-Weighted - NO (12.6) (31.6) (Vrms) Power Supply Ripple Rg=600, PSRR 65 80 - dB Rejection Vripple=-20dBV Control PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX.UNIT + High Level Input Voltage V STBY terminal 2 - V V IH Low Level Input Voltage V STBY terminal 0 - 0.5 V IL Standby Mode Operation Control Terminal Status IC Condition STBY Active H IC active Standby L, OPEN IC standby 2