RMU800A SERVICE MANUAL
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7. DTMF Receiver: LC73872M (TX-RX Unit IC122)
7-1 Pin Function
Pin No.
Name
I/O
Description
1 INPUT I Signal
input.
2 NC
No
connection.
3
PD
I
The IC goes to lower power mode when this pin is pulled high.
4 OSCO O
Oscillator
output.
5 OSCI
I Oscillator
input.
6 NC
No
connection.
7 V
SS
GND.
8 LOAD
I
Inputting a clock to this pin allows the serial data to be output two
or more times.
9
SD
O
The decoded DTMF signal is output.
10
ACK
I
Shifting out data from SD pin.
11
STD
O
A high level indicates the presence of a DTMF signal.
12
EST
O
A high level indicates the presence of a DTMF signal.
13 NC
No
connection.
14 V
DD
+5V.
8. D/A converter with buffer amplifier: M62364FP (TX-RX Unit IC125)
8-1 Pin Function
Pin No.
Name
I/O
Description
1,4,9,12,13,16,21,24
V
IN1
~
V
IN8
I
D/A converter input.
2,3,10,11,14,15,22,23
V
OUT1
~
V
OUT8
O
D/A converter output with 8-bit resolution.
5 V
DD
+5V.
6
LD
I
A low state enables data loading to shift register.
7 CLK
I
Shift
clock
input.
8
DI
I
Serial data input.
17
DO
O
Serial data output.
18 V
DAref
I
D/A Converter reference voltage input.
19
RESET
I
Reset 8-bit latches.
20 GND
GND.
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