M65856 Mitsubishi, M65856 Datasheet - Page 12

• Manufacturer Part Number: M65856
• Description: DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT
• Manufacturer: Mitsubishi

Gv=20log •
Gv(max)=47dB,fcl=48.2Hz
R1=0 ,C1=2.2µF
(4) Microphone amplifier
as follows.
(3) Clock oscillator circuit
Assuming Gv=37dB, fcl=15.1Hz,for instance,
the constants take the following values.
R1=3.3K ,C1=2.2µF
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 2 (MCLKCONT).
Fully internal clock supply prevents occurrence of undesired radiation without affecting
any external circuit.
The oscillator frequency fck is following.
The gain(Gv) and low cut-off frequency(fcl) of microphone amplifier are expressed
Rc
DC Current
R1+1.5K+334K
R1+1.5K
2
Clock frequency:fck
DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT
oscillator
fcl=
Clock
circuit
2 • (R1+1.5K) • C1
fck = 2 MHz(Rc=56K )
MITSUBISHI
ELECTRIC
1
MIC
MITSUBISHI SOUND PROCESSOR ICs
M65856SP
1µF
10K
1.5k
4
10k (typ)
REF
6
R1
C1
334k
7