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TCM4400 bảng dữ liệu(PDF) 21 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  GSM/DCS BASEBAND AND VOICE A/D AND D/A RF INTERFACE CIRCUIT
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TCM4400 bảng dữ liệu(HTML) 21 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
21
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
downlink timing considerations
Figure 2 shows the timing diagram for downlink operation.
Timing control of the baseband downlink path is controlled by bits DLON (downlink on), BCAL (calibration) and
BENA (enable) when BDLON is active (see the topic, timing and interface
). BDLON controls the power up of
the baseband downlink path, BCAL controls the start and duration of the autocalibration sequence, and BENA
controls the beginning and the duration of data transmission to the DSP, using the DSP serial interface.
The power-down sequence is controlled with two bits, the first bit (BBDLW of PWDNRG1 register) determines
whether the baseband downlink path can be powered down with external GSM receive window activation
(BDLON); the second bit (BBDLPD of PWDNRG1 register) controls the activation of the baseband downlink
path. See the topic,
power-down functional description, for more details about power-down control.
tw3
tsu6
BDLON
BCAL
DATAOUT
tsu4
tsu5
th4
th5
BENA
tw4
Figure 2. Downlink Timing Sequence



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