Tait TM9100 Service Manual

TM9100 Service Manual Circuit Descriptions 77
© Tait Electronics Limited August 2005
Figure 3.5 Block diagram of the CODEC and audio circuitry
DAC
CODEC 1
CODEC 2
Level
Shifter
2V3
Supply
Voltage
Divider
Buffer
Amplifier
Summer
Audio PA
Bias
Network
LPF
Buffer
Amplifier
CODEC and Audio
CDC RXVREF RX CDC IP RX CDC IN RX CDC QP RX CDC QN DIG RX EN CDC RXAGC CDC RX FETUNE CDCTX FIN BIAS1 CDCTX FIN BIAS2 CDCTX DRV BIAS CDCTX PWR CTL TXTEMP TX FWD PWR TX REV PWR SYN CDC LFV CDCVCO MOD CDCVCXO MOD SYN CDC FCL
Digital Board
AGND
+13V8 BATT +2V5 CDC +9V0 +3V3 +3V0AN CDC RXAUD AUD ITF SPK+ AUD ITF SPK– ITF RX BEEP IN ITF CH MICAUD ITFAUX MIC AUD ITFVOL WIP DC CDCAUD TAP OUT CDC RSSI ITFAUD TAP IN
CDC2 DIG SDTO
DIG RX EN
DIG CDC2 SDTI
DIG CDC2 SCLK
DIG CDC2 LRCK
DIG SYS CLK
DIG DAC LATCH
DIG DAC SPI DO
DIG DAC SPI CLK
+1V8
DIG CDCARSM
CDC DIGVSFS
CDC DIGVSDO
DIG CDCVSDI
CDC DIG BSDO
CDC DIG BSOFS
DIG CDCASFS
DIG CDCASDI
CDC DIGASDO
PSU SYS RST
PSU SYS RST
DIG RX EN
+2V3 FIL
Interface
Power
Supply
Receiver
Trans-
mitter
Frequency
Synthesizer
Volume
Control
DIGAUD CS
DIGAUD UD
DIGAUD PA EN1
DIGAUD PA EN2
Signal Types:
RF analog clock
digital asynchronous serial data synchronous serial data

Tait TM9100 Specifications

General

Brand	Tait
Model	TM9100
Category	Radio
Language	English