Kenwood KDS-100 Service Manual page 8

KDS-100
6. Transmit/Receive Signal Flow
■ Receive data signal
The transceiver detection output passes through CN5
No. 3 pin and amplifier (IC15), and its level is adjusted by the
D/A converter (IC17). The resulting signal is amplified by the
amplifier (IC22), goes to the CODEC (IC20), and is converted
to digital data.
This data is transferred serially from the CODEC to the
DSP (IC23) and operated by the DSP.
CN5
1
15
1
+
–
2
1
+
–
2
8
CIRCUIT DESCRIPTION
AMP ELE-VOL
IC15
NJM2904M
IC17
M62364FP
AMP
IC21
NJM2904M
■ Transmit data signal
The digital data processed by the DSP is transferred seri-
ally from the DSP to the CODEC, and converted to an analog
signal. It is amplified by the amplifier (IC14), its level is ad-
justed by the D/A converter (IC17), the signal passes
through the buffer amplifier (IC21), passes through CN5
No.5 pin, and is output to the transceiver as a transmit data
signal.
CODEC
IC20
AK4550VT
AMP
IC14
NJM2904M
Fig. 9
DSP
IC23
TMS320VC5402PGE
COUNTER
IC19
TC74VHC4040FT