BA7780 データシートの表示（PDF） - ROHM Semiconductor

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BA7780

Stereo zoom microphone amplifier for camcorders

ROHM Semiconductor 

Video ICs

•Operation notes

Points to note regarding zoom operation

When using a microprocessor to vary the voltages on pins 29 and

30 after presetting the electronic volume sensitivity and control volt-

4

age range, and with the pin 27 and 28 voltage fixed at a certain

level, it is possible to minimize drift in the zoom characteristics due

to tempreature fluctuations and differences between individual ICs

27

by setting the pin 27 and 28 voltages using resistive voltage divider

circuits connected to the pin 4 regulator voltage output.

28

•Electrical characteristic curves

0

28pin

1.64V

–5

Ta = 25°C

28pin

1.64V

1.84V

– 10

1.84V

1.94V

– 15

1.94V

2.04V

– 20

0 0.1

2.04V

12→13, 37→36pin

52→13, 52→36pin

0.6 1.1 1.6 2.1 2.2

29, 30pin CONTROL VOLTAGE: VCTL (V)

Fig. 4 Zoom control slope variation

characteristics

•External dimensions (Units: mm)

Ta = 25°C

0

–5

27pin

1.67V

– 10

1.87V

27pin

1.67V

1.87V

– 15

– 20

0 0.1

2.07V 1.67V

12→13, 37→36pin

52→13, 52→36pin

0.6 1.1 1.6 2.1 2.2

29, 30pin CONTROL VOLTAGE: VCTL (V)

Fig. 5 Zoom control position variation

characteristics

BA7780KV

Fig. 3

10

12.0 ± 0.3

10.0 ± 0.2

48

33

49

32

64

1

0.5

17

16

0.2 ± 0.1

0.125 ± 0.1

0.10

VQFP64

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