M61508FP(2008) 데이터 시트보기 (PDF) - Renesas Electronics

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M61508FP
(Rev.:2008)

The Electric Volume of Built-in Non Fader Volume with Tone Control

Renesas Electronics 

M61508FP

Zero-Crossing Detection Circuit

1. Meaning of Zero-Crossing Detection Circuit

In the conventional Serial Data Control Type Volume, Analog SW inside switches over simultaneously with Latch

Condition Detector. And the operation completes.

CLK

D32

D33

D34

DATA

Audio Signal

Signal GND (1/2VCC)

Latch Conditions

Noise Factor when

Signal is present

In this case the changing noise occurs at the time of Latch Condition Detector, the Analog SW switches over (Zero-

cross Detector Strobe occurs) in the moment that the Analog Signal cross Signal Ground (1/2VCC).

CLK

D32

D33

D34

DATA

Latch Conditions

Zero-cross Detector Strobe

(Form signal from inside IC)

Signal GND (1/2VCC)

Analog SW changing

Other, In the case of Audio Signal isn't inputted (No signal), even if only Zero-cross Detector Circuit detects Latch

Condition, Analog SW doesn't switch over for the Audio Signal never cuts Signal Ground (1/2VCC).

The Time Function switches the Analog SW after some time T.

The Timer Time can setting with the Serial Data of 5 ms, 10 ms, 15 ms, 20 ms.

REJ03F0203-0201 Rev.2.01 Mar 31, 2008

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