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PDF NJM2781 Data sheet ( Hoja de datos )
| Número de pieza | NJM2781 | |
| Descripción | Monaural Microphone Amplifier | |
| Fabricantes | ETC | |
| Logotipo |  |
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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
2
STBY
3
4
IN+
GND 8
Reg V+ 7
OUT 6
5
IN-
I PIN FUNCTION
1
4
No. SYMBOL
8 1 NOISE
FUNCTION
Noise Bypass
No. SYMBOL
5 IN-
2 REG
Regulator Output
6 OUT
5 3 STBY
Standby On/Off
7 V+
4 IN+
Non-Inverted Input
8 GND
FUNCTION
Inverted Input
Output
Power Supply
Ground
–1–
1 page  
NJM2781
Test Circuit 5 (Power Supply Ripple Rejection PSRR)
1µF
10µF
10µF
100Ω
1 NOISE
REG
2
STBY
3
Input
Rg=600Ω
6.8kΩ
0.33µF
V+
4
IN+
GND 8
Reg V+ 7
GND
V+
OUT 6
47kΩ
2.2µF
Output
IN- 5
4.7µF
15kΩ
680Ω
9kΩ
[PSRR]
BPF:1kHz
Test Circuit 6 (Stand-By Control Voltage VIH, VIL)
1µF
10µF
10µF
100Ω
1 NOISE
REG
2
STBY
3
Input
6.8kΩ
0.33µF
4
IN+
GND 8
Reg V+ 7
OUT 6
47kΩ
GND
V+
2.2µF
Output
IN- 5
4.7µF
15kΩ
680Ω
9kΩ
–5–
5 Page 
NJM2781
Total Harmonic Distortion vs. Output Voltage (V+)
Vin=-40dBV,RL=9kΩ,Ta=25°C
10
V+=2.7V
1 V+=2.8V
V+=4.5V
0.1
0.01
0.001
-35
-25 -15 -5
Output Voltage [dBV]
5
Total Harmonic Distortion vs. Output Voltage ( f )
10 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
0.01 f=100Hz
f =1kHz
0.001
-35
-25 -15
-5
Output Voltage [dBV]
5
Total Harmonic Distortion vs. Output Voltage (Ta)
V +=2.8V ,f =1kHz ,RL=9kΩ
10
1
Ta=-40°C
Ta= 25°C
0.1 Ta= 85°C
0.01
0.001
-35
-25 -15
-5
Output Voltage [dBV]
5
Pow er Supply Ripple Rejection vs. Frequency
100 V+=2.8V,Vin=-40dBV,RL=9kΩ,Ta=25°C
80
60
40
20
0
101E0+0
10100E0+0
1E1+k3
101E0+k3
Frequency [Hz]
110000Ek+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 –
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet NJM2781.PDF ] | |
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