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參數(shù)資料
| 型號(hào)： | TCM4400EGGM |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | GSM/DCS BASEBAND AND VOICE A/D AND D/A RF INTERFACE CIRCUIT |
| 中文描述： | 的GSM / DCS的基帶和語音的A / D和D / A射頻接口電路 |
| 文件頁數(shù)： | 49/64頁 |
| 文件大?。?/td> | 888K |
| 代理商： | TCM4400EGGM |
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TCM4400E
GSM/DCS BASEBAND AND VOICE A/D
AND D/A RF INTERFACE CIRCUIT
SLWS082A – JULY 1999 – REVISED MARCH 2000
49
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
power down register No. 1
The values in each bit position of power down register No. 1 have the meaning outlined in Table 14.
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BBRST:
This is the digital reset of the baseband codec (active at 1); the uplink burst buffer is loaded with
all 1s and the memory and registers of the downlink digital filter is cleared to 0. This is not a
toggle bit as it has to be set to 0 to remove the reset condition.
PWDNRG1: REGISTER FOR POWERING DOWN
ADDRESS: 7
R/W
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EXTCAL:
Downlink autocalibration mode (at 0: autocalibration; at 1: external calibration)
BBULW:
If cleared to 0, the baseband uplink path is powered down under the control of the GSM transmit
window (BULON terminal). If this bit is set to 1, the power down is only controlled by bit
BBULPD.
BBULPD:
This bit is functionally associated with bit BBULW. When this bit is set to 1, the baseband uplink
path is in power-down mode.
BBDLW:
If cleared to 0, the baseband downlink path is powered down under the control of GSM receive
window (BDLON terminal). If this bit is set to 1, the power down is only controlled by bit
BBDLPD.
BBDLPD:
This bit is functionally associated with bit BBDLW. When this bit is set to 1, the baseband
downlink path is in power-down mode.
VMIDW:
If cleared to 0, the VMID output driver is powered down under the control of GSM transmit
window (BULON terminal). If this bit is set to 1, the power down is only controlled by bit
VMIDPD.
VMIDPD:
This bit is functionally associated and paired with bit VMIDW. When VMIDW bit is set to 1, the
VMID output driver is active. When VMIDPD bit is set to 1, the VMID output driver is in
power-down mode.
BALOOP:
When set to 1, the internal analog loop of I and Q uplink terminals are connected to I and Q
downlink terminals.
SELVMID: When cleared to 0, this sets the common-mode voltage of the baseband uplink and VMID at
V
DD
/2; when set to 1, these voltages are set to 1.35 V.
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