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TCM4400EPET Datasheet(PDF) 37 Page - Texas Instruments

Part # TCM4400EPET
Description  GSM/DCS BASEBAND AND VOICE A/D AND D/A RF INTERFACE CIRCUIT
PDF  64 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TCM4400EPET Datasheet(HTML) 37 Page - Texas Instruments

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TCM4400E
GSM/DCS BASEBAND AND VOICE A/D
AND D/A RF INTERFACE CIRCUIT
SLWS082A – JULY 1999 – REVISED MARCH 2000
37
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
boundary scan register
CTL
IN
TDI
TDO
OUT
PWRDN
SSCLK
IN
OUT
SSDR
SSDX
IN
OUT
SSRST
VCLK
CTL
IN
VDR
OUT
CTL
VDX
OUT
CTL
VFS
IN
IN
RESET
BFSR
OUT
IN
BCLKR
IN
OUT
BDR
BDX
CTL
OUT
BCLKX
OUT
BFSX
CTL
IN
UCLKR
CTL
IN
OUT
UCDR
UCDX
CTL
IN
UCSEL
IN
BENA
IN
BDLON
IN
BULON
IN
BCAL
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



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