RMU800A SERVICE MANUAL
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6. Audio processor: AK2346 (TX-RX Unit IC106)
6-1 Pin Function
Pin No.
Name
I/O
Function
1
AGNDIN
I
Analog ground input pin.
2
AGND
O
Analog ground output pin.
3
TXIN
I
Transmit audio signal input pin.
4
TXINO
O
TXA1 feedback output pin.
5
LIMLV
I
Limit level adjuster pin.
6
EXTLIMIN
I
External signal input pin pre-limiter circuit.
7
MOD
O
The modulated transmit signal output pin.
8 VSS
GND.
9
TCLK
O
Clock output pin for MSK transmission data.
10 TDATA I
MSK transmission data input pin.
Data are latched synchronizing with the TCLK rising edge.
11 DI/O
I/O
Serial data input and output pin.
Input for register setting data and output for MSK receive data.
12
RDF/FC
O
MSK signal received flag and frame detection signal output pin.
13
SCLK
I
Clock input pin for serial data I/O.
14
DIR
I
Serial data I/O control pin.
15 XOUT
I
Crystal
oscillator connecting input pin.
16 XIN
I/O
Crystal
oscillator
connecting input and output pin.
17
VDD
Positive power supply pin.
18
EXPOUT
O
Expander and VR4 output pin.
19
RXAFIN
I
Receive audio signal input pin.
20
RXAF
O
Receive audio signal output pin.
21
RXLPFO
O
Receive LPF output pin.
22
RXINO
O
RXA1 feedback output pin.
23
RXIN
I
Demodulated audio signal input pin.
24
TEST
I
Test register control input pin.
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