M65854FP 查看數據表（PDF） - MITSUBISHI ELECTRIC

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M65854FP

DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT

MITSUBISHI ELECTRIC  

MITSUBISHI SOUND PROCESSOR ICs

M65854FP

50S E R I E S

KARAOKE

DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT

(3) 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 1 (MCLKCONT).

Fully internal clock supply prevents occurrence of undesired radiation without affecting

any external circuit.

The oscillator frequency fck is following.

fck = 4 MHz(Rc=22K )

Rc DC Current

1

Clock

oscillator

circuit

Clock frequency:fck

Note:

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

frequency (fck).

fck = 4 MHz(Rc = 22K )

Delay time = 196.6msec

Delay time = 1/fckX48XN

(N = the number of memory bits = 16384

(4) 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=225Hz

R1=0 ,C1=0.47µF

0.22µF

2

10k

REF

10k (typ)

334k

Assuming Gv=37dB, fcl=220Hz,for instance,

the constants take the following values.

R1=3.3K ,C1=0.15µF

1.5k

4

5

R1

C1

MITSUBISHI

ELECTRIC

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