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NJM2173A
LOW VOLTAGE MICROPHONE AMPLIFIER for PORTABLE AUDIO
s 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. s FEATURES q Operating Voltage Range 2.7 to 4.5V + q Operating Current 2.2mA typ. at V =2.7V q Supply Current in Standby Mode 1A max. q Maximum Output Voltage -1.5dBV typ. at THD=0.1% q Internal Two-type Gain Select Function 13dB typ./ 29dB typ. q Internal Standby Function q Power Ripple Rejection Terminal 95dB typ. at Gv=13dB q Bipolar Technology q Package Outline SSOP14 s PIN CONFIGURATION
1 2 3 4 5 6 7 14 13 12 11 10 9 8
s PACKAGE OUTLINE
NJM2173V
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 s BLOCK DIAGRAM
OUT1 1
AMP1 AMP2
14 O U T 2 13 D C C U T2 12 IN 2 11 M IC V + 2
Gv REG
DC CUT1 2 IN 1 3 M IC V + 1 4 REG 5 N O IS E 6 GND 7
10 G v 9 STBY 8 V+
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s ABSOLUTE MAXIMUM RATINGS (Ta=25C) 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
NJM2173A
UNIT V V mW C C
s ELECRRICAL CHARACTERISTICS ( V =2.7V, Gv=13dB, VIN=-40dBV, RL=9k, f=1kHz, Ta=25C) PARAMETER Operating Voltage Range Operating Current 1 Operating Current 2 Output Voltage Voltage Gain 1 Voltage Gain 2 Maximum Output Voltage Total Harmonic Distortion SYMBOL V
+
+
TEST CONDITION Standby On:STBY= V GV=29dB,No Signal,Standby Off :STBY=GND No Signal 10pin=L 10pin=H THD=0.1% VO=-28.2dBV GV=29dB, VO=-28.2dBV Rg=600, A-Weighted Rg=600, A-Weighted, GV=29dB Rg=600, VIN=-18dBV Rg=600, VIN=-34dBV, Gv=29dB V =3V, V =-20dBV, Rg=600 + + V =3V, V =-20dBV, Rg=600 GV=29dB
+ + +
MIN. 2.7 1.28 12 28 -2.7 80 70 2.3 2.0 0 V -0.5 0
+
TYP. 2.2 1.35 13 29 -1.5 0.013 0.05 -105 (5.63) -95 (17.8) 105 90 95 80 2.42 -
MAX. 4.5 1.0 2.8 1.42 14 30 0.026 0.1 -100 (10) -90 (32) 2.54 V
+
UNIT V A mA V dB dB dBV % % dBV (Vrms) dBV (Vrms) dB dB dB dB V V V V V
ICC1 ICC2 VO GV1 GV2 VOM THD1 THD2 VNO1
Output Noise Voltage VNO2 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 CS1 CS2 SVR1 SVR2 VREG VIHG VILG VHIS VILS
RL=3.55k Gv Termial Gv Terminal STBY Terminal STBYTerminal
0.5 V
+ +
V -2.0
s CONTROL TERMINAL EXPLANATION q STBY (9Pin) PARAMETER CONTROL SIGNAL STANDBY OFF L I IC is active. STANDBY ON H I IC is non-active. q Gv (10Pin) PARAMETER Gv1 Gv2
STATUS
CONTROL SIGNAL STATUS L I IC set up 13dB typ. voltage gain. H I IC set up 29dB typ. voltage gain.
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s APPLICATION CIRCUIT
NJM2173A
2.2uF
2.2uF
OUT1
9k 47uF
1
AMP1 AMP2
14
9k 47uF
OUT2 DC CUT2
0.33uF
DC CUT1
0.33uF
2 3
6.8k
13 12
6.8k
IN1 MIC V+1
10uF 10uF
IN2 MIC V+2
4 5
1uF
11
10uF
REG NOISE GND
Gv REG
10 9 8
47k 10uF
Gv=29dB Gv=13dB STBY ON STBY OFF
Gv STBY
6 7
V+
1uF
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.

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