M65855FP 查看數據表（PDF） - MITSUBISHI ELECTRIC

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M65855FP

1 Chip Digital Echo with Microphone mixing Amplifier

MITSUBISHI ELECTRIC  

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FUNCTION DESCRIPTION

MITSUBISHI SOUND PROCESSOR IC's

50 M65855FP

SERIES

KARAOKE

(1) Clock oscillator circuit

The M65855FP incorporates a current control type clock

oscillator circuit in it, thus providing circuit configuration just by

connecting a resistor for current control to pin 16 CLOCK.

Fully internal clock supply prevents occurrence of undesired

radiation without affecting any external circuit

When Rc=120kΩ fck=1MHz

Rc

16

Clock

oscillator

circuit

(2) Delay time Td

The delay time can be calculated by the equation;

Td=N/fs (N=The number of memory bits=20480)

when fck=1MHz,Td can be set at 164ms.

clock frequency

fck

<<Reference>>The M65855FP adopts ADM (adaptive Delta Modulation)

system in A/D,D/A converters.

The sampling frequency can be calculated by the following equation;

fs=clock frequency /8(Hz)

For clock frequency fck=1MHz, the calculated sampling frequency is ;

fs=1MHz/8=125kHz

(3) Mute

1) When power is on

When power is turned on, the mute function works automatically to

prevent noise generation.

(Here,however,"mute" means the function which prevents noise

generation after the reset time.)

Power on Reset

time

period

internal mode Mute time

Mute off

setting time (about 260msec) time

(a)When power is on ( fck=1MHz)

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ELECTRIC

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