TCM4400E Datasheet, PDF (37/64 Pages) Texas Instruments – GSM/DCS BASEBAND AND VOICE A/D AND D/A RF INTERFACE CIRCUIT

TCM4400E
GSM/DCS BASEBAND AND VOICE A/D
AND D/A RF INTERFACE CIRCUIT
SLWS082A – JULY 1999 – REVISED MARCH 2000
PRINCIPLES OF OPERATION
boundary scan register
PWRDN SSCLK SSDR SSDX SSRST VCLK
VDR
TDI
IN
OUT
IN
OUT
IN
OUT
CTL
IN
VDX
VFS
RESET BFSR BCLKR
OUT
CTL
OUT
CTL
IN
IN
OUT
CTL
IN
BDR
BDX
BCLKX
BFSX
UCLKR
IN
OUT
CTL
OUT
CTL
OUT
CTL
IN
UCDR UCDX
UCSEL BDLON BULON BCAL
BENA
IN
OUT
CTL
IN
IN
IN
IN
IN
TDO
power-down functional description
During certain mobile activity (such as paging, conversation mode, or idle) it is possible to disable some
TCM4400E functions in order to lower the power consumption. For example, it is possible to disable the internal
functions dedicated to radio transmission during GSM-idle mode. It is also possible to disable the internal
demodulator path during transmit window.
There are three ways to control the power consumption of the internal blocks as described in the following
paragraphs.
direct control with internal register
With this method these internal blocks are powered down:
• DAI GSM tests: bit DAION of register VBCTL3
• Transmit and receive voice path: bit VULON of register VBCTL1 and bit VDLON of register VBCTL2
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
37