參數(shù)資料
型號: TWL1110PBS
廠商: TEXAS INSTRUMENTS INC
元件分類: 消費(fèi)家電
英文描述: SPECIALTY CONSUMER CIRCUIT, PQFP32
封裝: PLASTIC, QFP-32
文件頁數(shù): 14/40頁
文件大小: 564K
代理商: TWL1110PBS
TWL1110
VOICE-BAND AUDIO PROCESSOR (VBAP
)
SLWS103 – NOVEMBER 2000
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 6. Typical Microphone Interface
microphone mute function
Transmit channel muting provides 80-dB attenuation of the 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 the gain in the transmit path. The total TX channel gain
can vary from 41.5 dB to 19.5 dB. The default total TX channel gain is 23.5 dB.
Table 2. 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
18
0
Extended
41.3
41.5
41.7
dB
0
1
23.5
18
–2
Extended
39.3
39.5
39.7
dB
0
1
0
23.5
18
–4
Extended
37.3
37.5
37.7
dB
0
1
23.5
18
–6
Extended
35.3
35.5
35.7
dB
0
1
0
23.5
18
–8
Extended
33.3
33.5
33.7
dB
0
1
0
1
23.5
18
–10
Extended
31.3
31.5
31.7
dB
1
0
23.5
6
0
Normal
29.3
29.5
29.7
dB
1
0
1
23.5
6
–2
Normal
27.3
27.5
27.7
dB
1
0
1
0
23.5
6
–4
Normal
25.3
25.5
25.7
dB
1
0
1
23.5
6
–6
Normal
23.3
23.5
23.7
dB
1
0
23.5
6
–8
Normal
21.3
21.5
21.7
dB
1
0
1
23.5
6
–10
Normal
19.3
19.5
19.7
dB
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