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PDF BA7781K Data sheet ( Hoja de datos )
| Número de pieza | BA7781K | |
| Descripción | Stereo microphone amplifier for camcorders | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Video ICs
Stereo microphone amplifier for cam-
corders
BA7781K
The BA7781K allows construction of a stereo-microphone amplifier for camcorder use with a minimum number of
external components. The IC has a built-in wind-noise detection circuit, and wind-noise rejection filter. The filter cir-
cuit is controlled automatically. The IC can operate off a 3.0V power supply.
•Applications
Camcorders
•Features
1) Operates off a 3.0V to 5.25V power supply.
2) Automatic wind-noise rejection circuit.
3) Matrix circuit for stereo emphasis.
4) Automatic switching circuit for external micro-
phones, built-in external monaural decision circuit,
and input switch mode decision circuit.
•Block diagram
24 23 22 21 20 19 18 17
EXT IN L 25 EXT
BG 26 INT
13dB
–
+
15dB
16 DET OUT
15 DET IN
INT IN L 27
GND 28
VREG 29
INT IN R 30
+– MIX
10dB
EXT
EXT
14 BIAS
BIAS
VCC
13 VCC
12 LPF INV OUT
+–
11 LPF INV IN
RIPL 31
INT
13dB
10 MIX OUT
+
EXT IN R 32 EXT
–
15dB
09 MIC MONO
01 02 03 04 05 06 07 08
1
1 page  
Video ICs
•Application example
UNITS
RESISTOR: Ω
CAPACITOR: F
EXT IN
L ch
INT IN
INT IN
R ch
EXT IN
GND
B' A' 15k
0.1µ
0.1µ
24
25 EXT
+ 26 INT
10µ
27
0.1µ
28
23 22
13dB
29
0.1µ
30
+
10µ
0.1µ
31
INT
32 EXT
1
13dB
23
2200p
10k 10.5k 0.022µ 100k
0.1µ 0.022µ
21 20 19 18 17
24k
–
15dB
16
+
15
2.2µ
+
1M
+– MIX
10dB
+
–
45
EXT 14
BIAS 13
VCC
12
EXT 11
10
15dB
9
678
+
10µ
2200p
220k
100k 150k 0.01µ
100k
0.01µ
24k
0.1µ
0.1µ 0.022µ
10k 10.5k 0.022µ 100k 2200p
BA7781K
L OUT
VCC
MIC-MONO
R OUT
A B 15k
Additional components INT / EXT monitoring
INT / EXT
100k
12
+
1µ
L OPEN
∗1) When using the matrix circuit connect A-A' and B-B'.
∗2) The pin 10 and 12 low-pass filter components are for fc = 150Hz, Gain = 0dB, 18dB / oct.
Fig. 2
5
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet BA7781K.PDF ] | |
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