TCM4400EPET datasheet(52/64 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 18. Uplink PGA Gain

VULPG 4

VULPG 3

VULPG 2

VULPG 1

VULPG 0

RELATIVE GAIN

–12 dB

–11 dB

–10 dB

–9 dB

–8 dB

–7 dB

–6 dB

–5 dB

–4 dB

–3 dB

–2 dB

–1 dB

0 dB

1 dB

2 dB

3 dB

4 dB

5 dB

6 dB

7 dB

8 dB

9 dB

10 dB

11 dB

12 dB

voiceband downlink control register

The values in the voiceband downlink control register bit positions control the audio power level in the downlink

path. Earphone volume is set (three bits VOLCTL0 –VOLCTL2) and PGA gain is set from –6 dB to 6 dB in 1

dB steps. This is shown in Table 19.

Table 19. Voiceband Downlink Control Register

VBCTL2: VOICEBAND DOWNLINK CONTROL REGISTER

ADDRESS: 11

R/W

VDLAUX

VDLEAR

VOLCTL2

VOLCTL1

VOLCTL0

VDLG3

VDLG2

VDLG1

VDLG0

VDLON

1 / 0

R/W

<–ACCESS TYPE

<–VALUE AT RESET

VDLON:

Power on of the downlink path of the audio codec

VDLEAR:

Enables the earphone amplifier if the VDLON bit is 1

VDLAUX:

Enables the auxiliary output amplifier if the VDLON bit is 1

VGLG (0–3) 1 dB:

Gain of the voice-downlink programmable gain amplifier (–6 dB to 6 dB in 1-dB steps);

see Table 20.

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