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CXA1878Q

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

Sony Semiconductor 

Pin

No.

Symbol

Typical pin voltage

I/O Z (in)

DC AC

Equivalent circuit

CXA1878Q

Description

19 SPEED

10k

—

—

I — 19

10k

Tape speed selection

∗ Normal speed/

double speed

selection

High: Double speed

Low : Normal speed

DGND

20 MODE SW — — I —

20

2k 6k

Recording/playback

mode control

∗ Recording/playback

mode selection

High : Recording mode

Low : Playback mode

21 VCC

22 DVCC

7.0V — I —

5.0V — I —

23 A EQ

2.5V

when — I —

open

23 10k

24 B EQ

2.5V

when —

I

—

24

10k

open

–7–

Positive power supply

Reference power

supply for mode control

DGND

Deck A playback

equalizer amplifier

control

∗ 120µs/70µs selection

High: 70µs

Low : 120µs

(Built-in equalizer

amplifier flat)

Control of deck B

playback equalizer

amplifier mode,

recording equalizer

amplifier mode, and

recording bias mode

∗ NORM/CrO2/METAL

selection

High : METAL

DGND Medium : CrO2

Low : NORM

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