TCM4400 Datasheet, PDF(61/72 Page) Texas Instruments – GSM/DCS BASEBAND AND VOICE A/D AND D/A RF INTERFACE CIRCUIT

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4.10.16 Voice Band Downlink Control Register

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

downlink path. Earphone volume is set (three bits VOLCTL0 âVOLCTL 2), and PGA gain is set from â 6 dB

to 6 dB in 1-dB steps. This is defined in Table 4â18.

ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ VDLAUX

ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ R/W

ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ 0

Table 4â18. Voice Band Downlink Control Register

VBCTL 2: VOICE BAND DOWNLINK CONTROL REGISTER

VDLEAR VOL VOL VOL VDLG VDLG VDLG VDLG VDL

CTL 2 CTL1 CTL0 3

0 ON

R/W R/W R/W R/W R/W R/W R/W R/W R/W

ADDRESS: 11 R/W

0 1 0 1 1 1/0

âACCESS TYPE

âVALUE 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 â 3) 1 dB: Gain of the voice downlink programmable gain amplifier (â 6 dB to 6 dB in

1-dB steps). See Table 4â19.

ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ1111110123456789102345ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃVÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃD0000000011111111LGÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ3TaÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃVbDle0000111100001111LÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃG4â21ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ9V. DDÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ0011001100110011LoGw1ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃnliVnÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃDkL0101010101010101PGÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃG0AÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃGREaLiÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃnAâââââââââT6543216660123456IVÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃddddddddddddddddEBBBBBBBBBBBBBBBBGÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃAINÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ

VOLCTL (0 â 2): Volume control (0, â 6 ,â12, 18, â 24, Mute). See Table 4â20.

4â25

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