BA7760 データシートの表示（PDF） - ROHM Semiconductor

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BA7760

Microphone Amplifier

ROHM Semiconductor 

Multimedia ICs

•Measurement circuit

10kΩ

8

5kΩ

10µF

9

MIX BF

+

–

BA7760 / BA7760F

2.2kΩ

+

7

4.7µF

5kΩ

6

470µF

+

+

47µF

10

11

220Ω

+

12

4.7µF

2.2kΩ

13

–+

+–

14

BA7760 / F

5

4

220Ω

4.7µF

+

3

2.2kΩ

2

470µF

+

+

47µF

+

1

22µF

Fig. 2

•Circuit operation (Refer to “Application Example”)

The BA7760 and BA7760F are dual microphone ampli-

fiers. The audio signals from the microphones are input

to pins 3 and 12. The gain at this time is determined by

attached resistors R3 / R4 and R6 / R7. By attaching

capacitors to pins 5 and 10, the microphone amplifiers

can be given frequency characteristics like those

shown below.

(Note: The attached component numbers are those used in “Application

Example.”)

60dB

40dB

20dB

C

=

C

150pF

=

0

0dB

180°

– 20dB

0°

3

1kHz

61 3 61 3

10kHz 100kHz

16M1 Hz31601MHz310601M–H1z80°

FREQUENCY : f (Hz)

Characteristics when using standard

components and standard constants

Fig. 3 Microphone amplifier

frequency characteristics

4

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