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Details, datasheet, quote on part number:NJM2781V
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Datasheet text preview:
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. 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
PRELIMINARY
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 -20 to 75 -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=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 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=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)
1µF
1 2
100
NOISE
GND
8 7 6 5
4.7µF 680 47k 2.2µF
GND V+ Output
9k [THD] BPF:400 to 22kHz
10µF
REG
Reg
V+
10µF
STBY
3 4
0.33µF IN+
OUT
Input
6.8k
IN-
15k
V+
Test Circuit 2 (DC Output Voltage VO, Output Noise VNO)
1µF NOISE
1 2
100
GND
8 7 6 5
4.7µF 680 47k 15k
GND V+
2.2µF
10µF
REG
Reg
V+
10µF
STBY
3 4
0.33µF IN+
OUT
Output
9k [VNO] A-Weighted
Input
6.8k
IN-
V+
Rg=600
3
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