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參數(shù)資料
| 型號： | M65853FP |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT |
| 中文描述： | 數(shù)字回聲混合電路和麥克風(fēng) |
| 文件頁數(shù)： | 12/17頁 |
| 文件大小： | 113K |
| 代理商： | M65853FP |
ELECTRIC
MITSUBISHI
(
/ 1 7 )
M65853FP
MITSUBISHI SOUND PROCESSOR ICs
KARAOKE
50
S
S
S E
E
E R
R
R I
I
I
E
E
E S
S
S
PRELIMINARY
(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
Clock
oscillator
circuit
Clock frequency:fck
1
DC Current
1 2
(4) Microphone amplifier
The gain(Gv) and low cut-off frequency(fcl) of microphone amplifier are expressed
as follows.
5
6
3
MIC
R1
C1
0.22μF
REF
Gv=20logR1+1.5K+334K
R1+1.5K
fcl=
1
2 (R1+1.5K)C1
Gv(max)=47dB,fcl=225Hz
R1=0
,C1=0.47μF
Assuming Gv=37dB, fcl=220Hz,for instance,
the constants take the following values.
R1=3.3K
,C1=0.15μF
10k
1.5k
334k
10k (typ)
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