M65845 データシートの表示（PDF） - MITSUBISHI ELECTRIC

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M65845

DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT

MITSUBISHI ELECTRIC  

M65845AFP PRELIMINARY Nsootmicee

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DIGITAL ECHO WITH

MITSUBISHI SOUND PROCESSOR

MICROPHONE MIXING CIRCUIT

ICs

FUNCTION DESCRIPTION

(1) Microphone amplifier

The gain(Gv) and low cut-off frequency(fcl) of microphone amplifier are expressed

as follows.

Gv=20log• R1+1.5K+334K

R1+1.5K

fcl=

1

2π•(R1+1.5K)•C1

MIC

Gv(max)=47dB,fcl=50Hz

R1=0Ω,C1=2.2µF

Assuming Gv=37dB, fcl=15Hz,for instance,

the constants take the following values.

R1=3.3KΩ,C1=2.2µF

1µF

2

5kΩ

REF

10kΩ(typ)

334kΩ

1.5kΩ

3

4

R1

C1

<< Attention point when M65845FP is replaced with M65845AFP >>

R3 and C4 are required for the

M65845FP, not for the M65845AFP.

MIC

As mentioned above, the gain of

microphone amplifier can set it up

with R1.

1µF

2

R2

REF

10kΩ(typ)

3

4

C4

R3 and C4 are not required for

the M65845AFP.

R1 for the gain of microphone

amplifier setting in use M65845AFP

R3

R1

C1

Recommended circuit In use M65845FP

MITSUBISHI

ELECTRIC

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