JVC MX-DVA5 Service Manual page 30

MX-DVA5
M65855FP(EIC1) : Sound processor
1. Pin layout
GND 1
ECHOVOL 2
REF
3
4
5
6
7
8
3. Block diagram.
REF
3
Oscillator
1/2 Vss
AUTO
RESET
LPF1
10
1-30
Pin No.
1
16 CLOCK
2
15
ECHOMUTE
3
V CC
14
4
13
OP1 IN
5
12
OP1 OUT 6
11 LPF1 IN
7
8
10 LPF1 OUT
9
9 MIC IN
10
11
12
13
14
15
16
ECHOMUTE
CLOCK
ECHOVOL
16 15 2
VOL
DO1
CLOCK
Main control
RESET
DO0
D1
A/D
11 12
2. Pin function
Symbol
GND
Echo level control with external DC voltage
ECHOVOL
To connect 1/2 Vcc output and filter capacitor
REF
OP2 IN
Uses external C to from an D/A conversion
integrator
OP2 OUT
LPF2 IN
Uses external CR to from a low pass filter at the
input side
LPF2 OUT
Mixing output echo output and microphone
MIC OUT
Microphone input
MIC IN
LPF1 OUT
Uses external CR to from a low pass filter at the
input side
LPF1 IN
OP1 OUT
Uses external C to from an D/A conversion
integrator
OP1 IN
Applies a voltage of 3.5V to 5.5V(Rated5V)
V CC
Echo mute control and clock stop control
ECHOMUTE
with external DC voltage
CLOCK Controls a built -in clock generation circuit with
external R
6
4 5
LPF2
D/A
20Kbit
MO
SRAM
MI
1
13 14
V cc
GND
DESCRIPTION
MIC OUT
7
8
MIX
9