j NJM2173A LOW VOLTAGE MICROPHONE AMPLIFIER for PORTABLE AUDIO ■ PACKAGE OUTLINE ■ GENERAL DESCRIPTION The NJM2173 is a low voltage microphone amplifier designed for portable audio items. It includes standby, two-type gain selector, and power ripple rejection adjustment circuit. It realizes very low turn-noise at standby mode. It is suitable for portable Mini-Disc, portable Compact-Disc, and other microphone amplifier application. NJM2173V ■ FEATURES ● Operating Voltage Range 2.7 to 4.5V + ● Operating Current 2.2mA typ. at V =2.7V ● Supply Current in Standby Mode 1µA max. ● Maximum Output Voltage -1.5dBV typ. at THD=0.1% ● Internal Two-type Gain Select Function 13dB typ./ 29dB typ. ● Internal Standby Function ● Power Ripple Rejection Terminal 95dB typ. at Gv=13dB ● Bipolar Technology ● Package Outline SSOP14 ■ PIN CONFIGURATION 1 14 2 13 3 12 4 11 5 10 6 9 7 8 PIN FUNCTION + 1. OUT 1 8. V 9. STBY 2. DC CUT 1 10. Gv 3. IN 1 + + 11. MIC V 2 4. MIC V 1 5. REG 12. IN 2 6. NOISE 13. DC CUT 2 7. GND 14. OUT 2 NJM2173V ■ BLOCK DIAGRAM 14 O U T 2 OUT1 1 AMP1 AMP2 13 D C C U T2 DC CUT1 2 12 IN 2 IN 1 3 M IC V + 1 4 11 M IC V + 2 REG 5 N O IS E 6 GND 7 Gv REG 10 G v 9 STBY 8 V+ j NJM2173A ■ ABSOLUTE MAXIMUM RATINGS (Ta=25°C) PARAMETER SYMBOL + Supply Voltage V Maximum Input Voltage VIN Power Dissipation PD Operating Temperature Range Topr Storage Temperature Range Tstg RATINGS 5 (3,12pin) -0.3 to VREG+0.3 300 -20 to +75 -40 to +125 UNIT V V mW °C °C + ■ ELECRRICAL CHARACTERISTICS ( V =2.7V, Gv=13dB, VIN=-40dBV, RL=9kΩ, f=1kHz, Ta=25°C) PARAMETER SYMBOL Operating Voltage Range TEST CONDITION + V MIN. TYP. MAX. UNIT 2.7 - 4.5 V - - 1.0 µA - 2.2 2.8 mA 1.28 1.35 1.42 V + Operating Current 1 ICC1 Operating Current 2 ICC2 Output Voltage VO Standby On:STBY= V GV=29dB,No Signal,Standby Off :STBY=GND No Signal Voltage Gain 1 GV1 10pin=L 12 13 14 dB Voltage Gain 2 GV2 10pin=H 28 29 30 dB Maximum Output Voltage VOM THD=0.1% -2.7 -1.5 - dBV THD1 VO=-28.2dBV - 0.013 0.026 % THD2 GV=29dB, VO=-28.2dBV - VNO1 Rg=600Ω, A-Weighted - VNO2 Rg=600Ω, A-Weighted, GV=29dB - CS1 Rg=600Ω, VIN=-18dBV - 0.05 -105 (5.63) -95 (17.8) 105 0.1 -100 (10) -90 (32) - % dBV (µVrms) dBV (µVrms) dB CS2 Rg=600Ω, VIN=-34dBV, Gv=29dB 80 90 - dB SVR1 V =3V, ∆V =-20dBV, Rg=600Ω + + V =3V, ∆V =-20dBV, Rg=600Ω GV=29dB - 95 - dB 70 80 - dB V Total Harmonic Distortion Output Noise Voltage Channel Separation Supply Voltage Rejection Ratio Microphone Regulator Output Voltage High Level Input Voltage G Low Level Input Voltage G High Level Input Voltage S Low Level Input Voltage S SVR2 + + VREG RL=3.55kΩ 2.3 2.42 2.54 VIHG Gv Termial 2.0 - V + V VILG Gv Terminal 0 - 0.5 V - + V VHIS VILS STBY Terminal STBYTerminal ■ CONTROL TERMINAL EXPLANATION ● STBY (9Pin) PARAMETER CONTROL SIGNAL STANDBY OFF L I IC is active. STANDBY ON H I IC is non-active. ● Gv (10Pin) PARAMETER Gv1 Gv2 + V -0.5 0 STATUS CONTROL SIGNAL STATUS L I IC set up 13dB typ. voltage gain. H I IC set up 29dB typ. voltage gain. - V + V -2.0 V j NJM2173A ■ APPLICATION CIRCUIT 2.2uF 2.2uF OUT1 1 OUT2 14 9kΩ 9kΩ AMP1 47uF DC CUT1 AMP2 47uF 2 13 3 12 0.33uF IN1 0.33uF 6.8kΩ MIC V+1 IN2 6.8kΩ 4 MIC V+2 11 10uF 10uF 10uF REG DC CUT2 5 Gv 10 47kΩ 10uF 1uF NOISE 6 GND 7 REG Gv=29dB Gv=13dB STBY ON 9 STBY OFF V+ 8 1uF Gv STBY MEMO [CAUTION] The specifications on this databook are only given for information , without any guarantee as regards either mistakes or omissions. The application circuits in this databook 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.