CXA1878Q 데이터 시트보기 (PDF) - Sony Semiconductor

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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

13 BIAS M

14 BIAS C

— —O—

13

15 BIAS N

14

15

Recording bias control

voltage output

100k

2.5V

16 AMS SW when —

I

—

50k 5k

16

open

5k

24k

DGND

AMS mode control

∗ Mode select switch for

AMS/BS amplifier

High: BS mode

Medium: AMS mode

Low: AMS/BS OFF mode

[BS mode = Music

signal interval detection

during playback]

[AMS mode = Music

signal detection during

FF/REW]

2.5V

50k 5k

17 PASS SW when — I — 17

open

5k

PASS mode control

H : PASS

M : MUTE

L : NR ON

DGND

18 METER SW — — I —

10k

18

DGND

Meter mode control

∗ Meter amplifier output

ON/OFF select switch

High: Meter output

OFF (mute)

Low : Meter output ON

–6–

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