M65845 查看數據表（PDF） - MITSUBISHI ELECTRIC

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M65845

DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT

MITSUBISHI ELECTRIC  

M65845AFP PRELIMINARY Nsootmicee

p; aTrhaismiestrnicotliamfitinsaalrsepseucbifjieccattitoonc. hange.

DIGITAL ECHO WITH

MITSUBISHI SOUND PROCESSOR

MICROPHONE MIXING CIRCUIT

ICs

(2) ALC level block diagram

vo(dBV)

10

ALC supply voltage control limits

+3

0

-10

-20

It is set 47dB for microphone amplifier gain.

-30

-60

-50

-40

-30

-20

-10

vi(dBV)

(3) ALC operation voltage control

ALC operation voltage can be formed within the limits of -10 to +3 dBV controlled

by DC control voltage which connect 35 pin.

(Setting up forms)

2.5V(

1

2

Vcc)

internal direct bias

half peak

voltage Vpo

35 pin control voltage VALC

0V

When ALC operation voltage is -5dBV

(at Vcc=5V)

VALC= 21Vcc-Vpo

-5dBV=0.56Vrms=1.59Vp-p=0.80Vp-o

VALC=2.5-0.8=1.7V

are concerned.

MITSUBISHI

ELECTRIC

( 8 / 15 )

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