CXA1878Q 查看數據表（PDF） - Sony Semiconductor

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CXA1878Q

Dolby∗ B-C Type Noise Reduction System with Recording/Playback Equalizer Amplifier

Sony Semiconductor 

CXA1878Q

Pin

No.

Symbol

Typical pin voltage

I/O Z (in)

DC AC

Equivalent circuit

Description

25 DECK A/B — — I —

10k

25

DGND

Playback deck A/B

select control

∗ Playback equalizer

amplifier input

selection

High: PB INB

Low : PB INA

26 METER1

27 METER2

1.6V –1.1dBv O —

60k

26

10k

27

Level meter amplifier

output

60k

28 REC VOL — — I 100kΩ 28

40k

GND

2.5V

29 REC BAL when —

open

70k

29

I 100kΩ

30k

8k

8k

21k

DVCC/2

30 DGND

0.0V

Recording volume level

control

High: Output signal

level increased

Low : Output signal

level reduced

Recording volume

balance control

High : Only VOL OUT2

output level

reduced

Low : Only VOL OUT1

output level

reduced

∗ Neither VOL OUT1

nor 2 output levels are

attenuated at the

control voltage of 2.5V.

Connect to GND.

–8–

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