TCM4400EPET datasheet(48/64 Pages) TI

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TCM4400E

GSM/DCS BASEBAND AND VOICE A/D

AND D/A RF INTERFACE CIRCUIT

SLWS082A – JULY 1999 – REVISED MARCH 2000

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

PRINCIPLES OF OPERATION

Table 12. Uplink Q DAC Register

BULQDAC: BASEBAND UPLINK Q DAC REGISTER

ADDRESS: 5

R/W

RESERVD

1/0

<–ACCE0S TYPE

<–VALUE AT RESET

RESERVD

: Reserved bits for testing purposes

Power down register No. 2

The values in each bit position of power-down register No. 2 have the meaning outlined in Table 13.

Table 13. PWDNRG2 Register

PWDNRG2: REGISTER FOR POWERING DOWN

ADDRESS: 8

R/W

RESERVD

TIMGPN

TIMGPD

BBSIPN

BBSIPD

VGAPPN

CHGUP

VREFPN

VREFPD

1/0

R = 0

R/W

<–ACCESS TYPE

<–VALUE AT RESET

VREFPN: If cleared to 0, the internal reference voltage is powered down under the control of terminal

PWRDN and bit VREFPD. If bit VREFPN is set to 1, the power down is only controlled by bit

VREFPD.

VREFPD: This bit is functionally associated with bit VREFPN.

VGAPPN: If cleared to 0, the internal reference VGAP is powered down under the control of terminal

PWRDN. If this bit is set to 1, the VGAP is not placed in power-down mode.

TIMGPN: If cleared to 0, the internal reference VGAP is powered down under the control of terminal

PWRDN. If this bit is set to 1, the power-down control is only controlled by bit TIMPGD

TIMGPD: This bit is functionally associated with bit TIMGPN.

BBSIPN: If cleared to 0, the baseband serial interface is powered down under the control of terminal

PWRDN. If this bit is set to 1, the power down is only controlled by bit BBSIPD.

BBSIPD: This bit is functionally associated with bit BBSIPN. When this bit is set to 1, baseband serial

interface is in power-down mode.

CHGUP: This bit is used for testing purposes to accelerate the bandgap settling time.

RESRVD: Reserved bits for testing purpose

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