TCM4400E Datasheet, PDF (52/64 Pages) Texas Instruments – GSM/DCS BASEBAND AND VOICE A/D AND D/A RF INTERFACE CIRCUIT

TCM4400E
GSM/DCS BASEBAND AND VOICE A/D
AND D/A RF INTERFACE CIRCUIT
SLWS082A – JULY 1999 – REVISED MARCH 2000
PRINCIPLES OF OPERATION
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ_VULÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ_{1111110000000000000111111PG}ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ₄ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ_{VUL0011110000000011111000000}ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ_PG3ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ_VÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ^T_U^a_{L0100000000111100001000111}^b_PÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ^l_G^e₂ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ^18._VÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ^U_U^p_{L0100110011001100110011001P}^lÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁⁱ_G^nk₁ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ^PG_VÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ_U^A_{L0101010101010101010101010P}^GÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ_G^a₀ⁱⁿÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ_REÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ_{LA––––––––––––111T0123456789111}ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ_{198765432102I120VdddddddddddddddddddddddddBBBBBBBBBBEBBBBBBBBBBBBBBB}ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ_GAIÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ_N ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
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.
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _VDLAUX
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _R/W
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ₀
VDLEAR
R/W
0
Table 19. Voiceband Downlink Control Register
VBCTL2: VOICEBAND DOWNLINK CONTROL REGISTER
VOLCTL2 VOLCTL1 VOLCTL0 VDLG3 VDLG2
VDLG1
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
VDLG0
R/W
0
VDLON
R/W
0
ADDRESS: 11 R/W
0 1 0 1 1 1/0
<–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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