參數(shù)資料
型號(hào): STLC7549
廠商: 意法半導(dǎo)體
元件分類: Codec
英文描述: Stereo Audio/MODEM/Telephony Codec(立體聲音頻/調(diào)制解調(diào)器/電話編解碼器)
中文描述: 立體聲音頻/調(diào)制解調(diào)器/語音編解碼器(立體聲音頻/調(diào)制解調(diào)器/電話編解碼器)
文件頁(yè)數(shù): 28/35頁(yè)
文件大小: 335K
代理商: STLC7549
REGISTERDESCRIPTION
(continued)
Index Register3 :
Line Input #3 Gain
ControlRegister
7
6
5
4
3
2
1
0
L
L
L
L
R
R
R
R
RI3G3to RI3G0 : Reset value : 0000.
Right line input #3 gain select.
LI3G3to LI3G0 : Reset value : 0000.
Left lineinput #3 gain select.
Referto the line input gainselect table (Table2) to
understand how these bits relate to the actual
gain/attenuationvalue.
Table 2 :
Line Input GainSelect (G1)
Bit
Code
0000
0001
0010
0011
0100
0101
0110
0111
Decimal
Gain
(dB)
-24
-22
-20
-18
-16
-14
-12
-10
Bit
Code
1000
1001
1010
1011
1100
1101
1110
1111
Decimal
Gain
(dB)
-8
-6
-4
-2
+0
+2
+4
+6
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Index Register4 :
Right MicrophoneInput Gain
ControlRegister
7
6
5
4
3
2
1
0
0
0
0
+
R
R
R
R
RIMG3
to RIMG0
: Reset value : 0000.
Right input microphonegain select.
Refer to the microphone gain table
(Table 3) to understand how these bits
relatetotheactualgain/attenuationvalue.
+MPRER : Reset value : 0
Settingthisbitto a 1will place a+20dB
pre-amplifier in the microphone right
signal path. If this bit is a 0, the pre-
amplifiergainwillbe+0dB(seeTable4).
Index Register 5 :
Left MicrophoneInput Gain
ControlRegister
7
6
5
4
3
2
1
0
0
0
0
+
L
L
L
L
LIMG3
to LIMG0
: Reset value : 0000.
Left input microphonegain select.
Refer to the microphone gain table
(Table3) to understandhow thesebits
relate to the actual gain/attenuation
value.
+MPREL : Reset value : 0.
Settingthisbittoa1willplacea+20dB
pre-amplifier in the microphone left
signal path. If this bit is a 0, the gain
will be +0dB.
Table 3 :
MicrophoneGain Select (G2)
B
D
G
G
+
(
B
D
G
G
+
(
0000
0
+0.0
+20.0
1000
8
+20.0
+40.0
0001
1
+2.5
+22.5
1001
9
+22.5
+42.5
0010
2
+5.0
+25.0
1010
10
+25.0
+45.0
0011
3
+7.5
+27.5
1011
11
+27.5
+47.5
0100
4
+10.0
+30.0
1100
12
+30.0
+50.0
0101
5
+12.5
+32.5
1101
13
+32.5
+52.5
0110
6
+15.0
+35.0
1110
14
+35.0
+55.0
0111
7
+17.5
+37.5
1111
15
+37.5
+57.5
Table 4 :
Pre-amplifier (P)
MPRER / MPREL
0
1
Pre-amplifier Gain (P)
+0dB
+20dB
STLC7549
28/35
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