M65845 参数 Datasheet PDF下载

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MITSUBISHI SOUND PROCESSOR ICs

M65845AFP

DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT

(6) Digital Echo

1 Clock oscillator circuit

This IC incorporates a current control type clock oscillator circuit in it, thus providing circuit

configuration just by connecting an Rc for current control pin 32 (CLOCK CONT).

Fully internal clock supply prevents occurrence of undesired radiation without affecting

any external circuit.

The oscillator frequency fck is following.

fck = 2 MHz(Rc=51KΩ)

Note:

The delay time(Td) for echo is determined by the clock

frequency(fck).

Rc

DC Current

32

Clock

oscillator

circuit

Delay time=1/fckX24XN

(N=the number of memory bits = 16384

fck = 2 MHz(Rc=51KΩ) : Delay time=197msec

fck = 2.6MHz(Rc=39KΩ) : Delay time=150msec

fck = 3.9MHz(Rc=24KΩ) : Delay time=100msec

Clock frequency:fck

2Å@Auto mute function

The IC carries out auto mute function at the time of powering up and switching on

MIC SW in order to suppress shock noise that the digital delay may produce.

•At power up

Reset Time

Mute time

(400msec)

•At switching on MIC SW

MIC SW OFF

Mute time

(400msec)

switching on MIC SW

MITSUBISHI

ELECTRIC

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