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參數資料
型號: TWL1102PBS
廠商: TEXAS INSTRUMENTS INC
元件分類: 消費家電
英文描述: SPECIALTY CONSUMER CIRCUIT, PQFP32
封裝: PLASTIC, TQFP-32
文件頁數: 14/29頁
文件大小: 387K
代理商: TWL1102PBS
TWL1102
VOICE-BAND AUDIO PROCESSOR (VBAP
)
SLVS264 – NOVEMBER 1999
21
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
transmit operation (continued)
_
+
_
+
Vref
510 k
510 k
34 k
34 k
Ci MIC1N
Ci MIC1P
M
I
C
Rmic
MBIAS
Figure 7. Typical Microphone Interface
microphone mute function
Transmit channel muting provides 80-dB attenuation of input microphone signal. The MICMUTE function can
be selected by setting bit 6 of the power control register through the I2C interface.
transmit channel gain control
The values in the transmit PGA control registers control control the gain in the transmit path. The total TX
channel gain can vary from 35.5 dB to 13.5 dB. The default total TX channel gain is 23.5 dB
Table 4. Transmit Gain Control
BIT NAME
MIC AMP1
MIC AMP2
TX PGA
GAIN
MODE
TOTAL TX GAIN
TP3
TP2
TP1
TP0
GAIN
MIN
TYP
MAX
UNIT
0
23.5
12
0
Extended
35.3
35.5
35.7
dB
0
1
23.5
12
–2
Extended
33.3
33.5
33.7
dB
0
1
0
23.5
12
–4
Extended
31.3
31.5
31.7
dB
0
1
23.5
12
–6
Extended
29.3
29.5
29.7
dB
0
1
0
23.5
12
–8
Extended
27.3
27.5
27.7
dB
0
1
0
1
23.5
12
–10
Extended
25.3
25.5
25.7
dB
1
0
23.5
0
Normal
23.3
23.5
23.7
dB
1
0
1
23.5
0
–2
Normal
21.3
21.5
21.7
dB
1
0
1
0
23.5
0
–4
Normal
19.3
19.5
19.7
dB
1
0
1
23.5
0
–6
Normal
17.3
17.5
17.7
dB
1
0
23.5
0
–8
Normal
15.3
17.5
17.7
dB
1
0
1
23.5
0
–10
Normal
13.3
13.5
13.7
dB
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