Tait TP9100 - Page 62

62 Circuit Descriptions TP9100 Service Manual
© Tait Electronics Limited May 2005
Figure 3.5 Block diagram of the CODEC and audio circuitry
CODEC 1
CODEC 2
Level
Shifter
3V0
Filter
Voltage
Divider
Audio PA
CODEC
and
Audio
RX CDC IP RX CDC IN RX CDC QP RX CDC QN DIG RX EN CDC TXFIN RXAGC CDC TXPWR RXFE CDC TXFIN RXAGC CDC TXPWR RXFE SYN CDC LFV CDC VCO MOD CDC VCXO MOD SYN CDC FCL
Digital
+7V5 SW +2V5 CDC +5V TX +3V3 +3V0 AN CDC ACC SPK+ CDC ACC SPK– ACC AUD TAP IN
digital
RF analog clock
Signal Types:
asynchronous serial data synchronous serial data
CDC2 DIG SDTO
DIG RX EN
DIG CDC2 SDTI
DIG CDC2 SCLK
DIG CDC2 LRCK
DIG SYS CLK
DIG CDC ARSM
CDC DIG VSFS
CDC DIG VSDO
DIG CDC VSDI
CDC DIG BSDO
CDC DIG BSOFS
DIG CDC ASFS
DIG CDC ASDI
CDC DIG ASDO
DIG CDC RST
DIG RX EN
+3V0 FIL
AGND
Interfaces
Power
Supply
Receiver
Trans-
mitter
Frequency
Synthesizer
ACC MIC AUD
Bias
Network
LPF
Buffer
Amplifier
CDC AUD TAP OUT
DIG AUD PA EN
DIG INT SPK INH
Level
Shifter
+7V5 LINK +1V8
DIG MUX ADC
DIG MUX ADC
SUI VOL DC FPI CDC MANDOWN
Temp.
Sensor
FPI CDC TEMP CDC SUI SPK+
Buffer
Amplifier
CDC SUI SPK–
(Transmitter PA)