BA7781 データシートの表示（PDF） - ROHM Semiconductor

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BA7781

Stereo microphone amplifier for camcorders

ROHM Semiconductor 

Video ICs

•Pin descriptions

Pin No.

Pin name

1

MODE 1

2

PRE OUT R

3

INV IN R

4

INV OUT R

5

MTX IN R

6

MTX OUT R

7

HPF IN R

8

OUT R

9

MIC MONO

10

MIX OUT

11

LPF INV IN

12

LPF INV OUT

13

VCC

14

BIAS

15

DET IN

16

DET OUT

17

OUT L

18

HPF IN L

19

MTX OUT L

20

MTX IN L

21

INV OUT L

22

INV IN L

23

PRE OUT L

24

MODE 24

25

EXT IN L

26

BG

27

INT IN L

28

GND

29

VREG

30

INT IN R

31

RIPL

32

EXT IN R

Function

Mode control 1 input

Preamplifier output

Inverter input

Inverter output

Matrix amplifier input

Matrix amplifier output

High-pass filter input

Signal output

External microphone monaural decision signal output

Mix Output

Low-pass filter block inverter input

Low-pass filter block inverter output

VCC

Bias voltage

Detector circuit input

Detector circuit output

Signal output

High-pass filter input

Matrix amplifier output

Matrix amplifier input

Inverter output

Inverter input

Preamplifier output

Mode control 24 input

External microphone input

For regulator ripple filter capacitor

Internal microphone input

GND

Regulator output

Internal microphone input

For bias ripple filter capacitor

External microphone input

∗ EF: emitter follower, P-P: push pull, B: base, and C: collector.

All numerical values are standardized values.

Voltage (V)

—

1.65

1.65

1.65

1.65

1.65

1.65

1.65

—

1.65

—

—

3.3

1.65

1.65

—

1.65

1.65

1.65

1.65

1.65

1.65

1.65

—

1.65

1.25

1.65

—

2.5

1.65

1.65

1.65

BA7781K

Circuit

25kΩ

EF (P - P)

100kΩ

EF (P - P)

B

EF (P - P)

100kΩ

C (P - P)

C

EF (P - P)

B

EF (P - P)

—

EF (P - P)

2kΩ

22kΩ

C (P - P)

100kΩ

EF (P - P)

B

EF (P - P)

100kΩ

EF (P - P)

25kΩ

75kΩ

10kΩ

75kΩ

—

C

75kΩ

50kΩ

75kΩ

3

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