TCM4400EPET datasheet(55/64 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

auxiliary functions control register 1

The bit values in the auxiliary functions control register 1 resets the APC generator or the AFC modulator, selects

the A/D counter input, and selects the AFC sampling frequency. This is shown in Table 24.

Table 24. AUX Functions Control Register 1

UXCTL1: AUXILIARY FUNCTIONS CONTROL REGISTER

ADDRESS: 13

R/W

AFCPN

AFCPD

ADCPN

ADCPD

AFCCK1

AFCCK0

ADCCH2

ADCCH1

ADCCH0

ARST

1/0

R/W

<–ACCESS TYPE

<–VALUE AT RESET

ARST:

Reset of the digital parts for the auxiliary function (APC generator and AFC modulator).

This is not a toggle bit and has to be set to 0 to remove the reset condition.

ADCCH (0–2):

Selection of the input of the A/D converter; see Table 25.

Table 25. A/D Converter Selection

ADCCH2

ADCCH1

ADCCH0

A/D CONVERTER INPUT SELECTION

A/D conversion of ADIN1

A/D conversion of ADIN2

A/D conversion of ADIN3

A/D conversion of ADIN4

A/D conversion of ADIN5

AFCCK (0–1): Selection of the sampling frequency of the AFC, see Table 26.

Table 26. AFC Selection

AFCCK1

AFCCK0

AFC INTERNAL FREQUENCY

0.25 MHz

0.50 MHz

1 MHz

2 MHz

AFCPN:

If cleared to 0, the AFC block is powered down under the control of the PWRDN terminal. If

this bit is set to 1, the power down is only controlled by bit AFCPD.

AFCPD:

This bit is functionally associated and paired with bit AFCPN. When the AFCPN bit is 1, the

AFC block is active. When the AFCPD bit is set to 1, the AFCPD block is in power-down

mode.

ADCPN:

If cleared to 0, the auxiliary ADC block is powered down when under the control of PWRDN.

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

ADCPD:

This bit is functionally associated and paired with bit ADCPN. When the ADCPN bit is set to

1, an auxiliary ADC is active. When the ADCPD bit is set to 1, the auxiliary ADCPD is in

power-down mode.

TCM4400EPET Datasheet(PDF) 55 Page - Texas Instruments

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