Figure 4.4-5.Vocon Receive Audio Path - Motorola ASTRO XTS 2500 Service Manual

700/800 MHz Detailed Theories of Operation: VOCON Functional Blocks
ABACUS III
RX_SSI_FSYNC
RX_SSI_CLK
RX_SSI_DATA
Patriot SAP/BBP
Patriot SPIB
MAKO_CS
SPI_MISOB
SPI_MOSIB
SCKB
Internal
Speaker =
28 ohms
External
Speaker
6816985H01-B
U401
3 3
CODEC_RX
CODEC_DCLK
CODEC_FSYNC
4
VC_OUT_P
HP & LP
Filter = 22kHz,
VC_OUT_M
200Hz
PA_IN_M
PA_IN_P
Figure 4.4-5. VOCON Receive Audio Path
CODEC
Digital
16-Bit
LPF = 3.4kHz
D/A
G4
Preamp =
0 to 10
dB
PA
Control
MAKO IC U701
G1 Digital
Gain = 0 or
1 dB
G3
Attenuator
= -52 to 0
dB
G5
EXT PA
=26 dB
G6
INT PA
=26 dB
August 16, 2007
4.4-19