參數(shù)資料
型號(hào)： TCM4400EGGM
廠商： Texas Instruments, Inc.
英文描述： GSM/DCS BASEBAND AND VOICE A/D AND D/A RF INTERFACE CIRCUIT
中文描述： 的GSM / DCS的基帶和語(yǔ)音的A / D和D / A射頻接口電路
文件頁(yè)數(shù)： 51/64頁(yè)
文件大?。?/td> 888K
代理商： TCM4400EGGM
TCM4400E
GSM/DCS BASEBAND AND VOICE A/D
AND D/A RF INTERFACE CIRCUIT
SLWS082A – JULY 1999 – REVISED MARCH 2000
51
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
voiceband uplink control register
The values in the voiceband uplink control register bit positions control not only the power level of the audio in
the uplink path but also set the gain of the PGA from –12 dB to 12 dB in 1 dB steps. Bit MICBIAS and VULMIC
and VULAUX are shifted by one position to the left. This is shown in Table 17.
Table 17. Voiceband Uplink Control Register
ááááááááááááááááááááááááááááááá
VDXMUTE
MICBIAS
VULMIC
VULAUX
VULPG4
ááááááááááááááááááááááááá
áááááááááááááááááááááá
VULON:
Power on the uplink path of the audio codec
0
1
0
ááááááááá
1/0
ááááááááááááááááááááááááááááááá
R/W
VULPG3
VULPG2
VULPG1
VULPG0
R/W
VULON
ááááááááá
0
<–ACCESS TYPE
1
0
0
R /W
R/W
R/W
R/W
R/W
R/W
0
R/W
R/W
<–VALUE AT RESET
0
0
0
0
0
0
0
VULAUX:
Enables the auxiliary input amplifier if bit VULON is 1
VULMICL:
Enables the microphone input amplifier if bit VULON is 1
MICBIAS:
When MICBIAS = 0, the analog bias for the electret-type microphone and external
decoupling is driven to 2 V; when the value is 1, the bias is 2.5 V.
VDXMUTE:
When VDXMUTE = 1, the VDX output is forced to zero, when the value is 0, VDX is
transmitted normally. To avoid cutting a VDX word during transmission due to
asynchronism of writing this bit via DSP or MCU serial interface, VDXMUTE is internally
resynchronized with the 8 KHz voice frame.
VULPG (0–4):
Gain of the voice uplink programmable gain amplifier (–12 dB to 12 dB in 1 dB step), see
Table 18.
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