
6.2
Audio/Voice Uplink (TX) Module
6.2.1
Microphone Bias Module
TPS65950
Integrated Power Management/Audio Codec
www.ti.com
SWCS032 – OCTOBER 2008
Table 6-15. Boost Electrical Characteristics Versus FS Frequency (FS ≥ 24 kHz)
FS = 24 kHz
FS = 32 kHz
FS = 44.1 kHz
FS = 48 kHz
FS = 96 kHz
Frequency
Unit
(Hz)
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
10
5.79
5.90
5.97
5.89
5.99
5.95
5.98
6.04
5.96
5.99
6.01
5.71
5.83
5.90
12
5.70
5.85
5.95
5.84
5.98
5.92
5.97
6.03
5.94
5.98
6.00
5.54
5.68
5.81
15.2
5.53
5.76
5.91
5.73
5.96
5.87
5.94
6.02
5.89
5.95
5.99
5.40
5.57
5.73
18.2
5.35
5.65
5.87
5.62
5.93
5.80
5.90
6.00
5.83
5.93
5.98
5.28
5.48
5.68
20.5
5.19
5.56
5.83
5.52
5.91
5.74
5.87
5.99
5.78
5.90
5.97
5.19
5.42
5.64
29.4
4.55
5.18
5.64
5.10
5.07
5.79
5.51
5.75
5.94
5.57
5.79
5.92
4.87
5.18
5.48
39.7
3.81
4.62
5.37
4.52
5.64
5.12
5.53
5.85
5.26
5.59
5.84
4.47
4.91
5.30
50.4
3.14
4.06
5.02
3.94
3.95
5.43
4.69
5.27
5.72
4.88
5.37
5.73
4.08
4.63
5.11
60.3
2.62
3.51
4.69
3.46
3.54
5.21
4.30
5.00
5.59
4.49
5.13
5.62
3.72
4.37
4.95
76.7
1.97
2.90
4.15
2.76
4.78
3.68
4.52
5.34
3.91
4.70
5.40
3.18
3.92
4.67
97.5
1.41
2.22
3.51
2.10
2.09
4.27
2.99
3.94
4.99
3.24
4.15
5.07
2.59
3.41
4.33
dB
131.5
0.88
1.49
2.65
1.40
3.49
2.15
3.10
4.35
2.38
3.35
4.51
1.86
2.69
3.75
157
0.65
1.13
2.15
1.04
2.96
1.70
2.58
3.90
1.90
2.82
4.08
1.47
2.24
3.35
200
0.41
0.76
1.55
0.70
2.28
1.19
1.93
3.23
1.35
2.15
3.44
1.03
1.68
2.77
240
0.30
0.55
1.18
0.50
1.81
0.89
1.51
2.71
1.02
1.70
2.92
0.77
1.31
2.32
304
0.18
0.35
0.80
0.33
0.32
1.27
0.58
1.04
2.05
0.68
1.19
2.24
0.51
0.90
1.75
463
0.08
0.16
0.37
0.14
0.64
0.27
0.50
1.12
0.31
0.58
1.25
0.23
0.43
0.95
704
0.03
0.06
0.16
0.06
0.29
0.12
0.23
0.56
0.14
0.27
0.62
0.10
0.20
0.46
1008
0.01
0.03
0.07
0.03
0.02
0.14
0.06
0.11
0.30
0.06
0.13
0.31
0.05
0.10
0.23
1444
0.00
0.01
0.03
0.01
0.06
0.03
0.05
0.16
0.03
0.06
0.15
0.02
0.05
0.11
2070
0.00
0.01
0.00
0.02
0.01
0.02
0.09
0.01
0.03
0.07
0.01
0.02
0.05
3770
0.00
0.04
0.00
0.01
0.00
0.01
The voice uplink path includes two input amplification stages dedicated to ten analog input terminals:
MIC_MAIN_P, MIC_MAIN_M (differential main handset input)
MIC_SUB_P, MIC_SUB_M (differential sub handset input)
HSMICP, HSMICM (differential headset input)
AUXL (common terminal: single-ended auxiliary/FM radio left channel input)
AUXR (common terminal: single-ended auxiliary/FM radio right channel input)
CEA carkit and MCPC transmit audio (TXAF) microphone through DINP/DINM pins
For all cases, only two analog input amplifiers can be used, because two ADCs are available.
The voice uplink path also includes two pulse density modulated (PDM) interfaces for digital microphones.
Two stereo digital microphone interfaces are available.
The left and right channels of the FM radio can be connected to any audio output stage (for example,
earpiece, headset speakers, etc.) through a connection matrix.
Three bias generators provide an external voltage of 2.2 V to bias the analog microphones (MICBIAS1,
MICBIAS2, and HSMICBIAS terminals). The typical output current is 1 mA for each analog bias
microphone.
Two bias generators can provide an external voltage of 1.8 V to bias digital microphones (DIGMIC_0 and
DIGMIC_1). The typical output current is 5 mA for each digital bias microphone.
Audio/Voice Module
83