參數(shù)資料
型號(hào): TPS65950ZXNR
廠商: TEXAS INSTRUMENTS INC
元件分類: 消費(fèi)家電
英文描述: SPECIALTY CONSUMER CIRCUIT, PBGA209
封裝: 7 X 7 MM, 0.40 MM PITCH, PLASTIC, BGA-209
文件頁數(shù): 161/167頁
文件大?。?/td> 2566K
代理商: TPS65950ZXNR
6.2.7
Microphone Amplification Stage
6.2.8
Carkit Input
DigitalPGA
Gain=0to31dB
Amp
0to
30dB
ADC
Amp
CEA
–1.02dB
MCPC
0.56dB
032-041
TPS65950
Integrated Power Management/Audio Codec
www.ti.com
SWCS032 – OCTOBER 2008
Table 6-21. Uplink Amplifier Characteristics
Parameter
Test Conditions
Min(1)
Typ(2)
Max(3)
Unit
Speech delay
Voice path
0.5
ms
Gain range(4)
0
61
dB
Absolute gain
0 dBFs at 1.02 kHz
–1
1
dB
Peak-to-peak differential input voltage (0 dBFs)
For differential input
1.5
VPP
0 dB gain setting
Peak-to-peak single-ended input voltage (0 dBFs)
For single-ended input
1.5
VPP
0 dB gain setting
Total harmonic distortion (sine wave at 1.02 kHz)
At –1 dBFs
–80
–75
dB
At –6 dBFs
–74
–69
At –10 dBFs
–70
–65
At –20 dBFs
–60
–55
At –60 dBFs
–20
–15
Idle channel noise
20 Hz to 20 kHz, A-weighted, gain = 0 dB
–85
–78
dBFs
16 kHz: < 20 Hz to 7 kHz, gain = 0 dB
–90
8 kHz: P-weighted voice, gain = 18 dB
–87
16 kHz: < 20 Hz to 7 kHz, gain = 18 dB
–82
Crosstalk A/D to D/A
Gain = 0 dB
–80
dB
Crosstalk path between two microphones
–70
dB
Intermodulation distortion
Two-tone method
–60
dB
(1)
Min = Minimum value
(2)
Typ = Typical value
(3)
Max = Maximum value
(4)
Gain range is defined by: Preamplifier = 0 to 30 dB; Filter = 0 to 31 dB (1-dB steps)
Microphone amplification stages perform the single-to-differential conversion for single-ended inputs. Two
programmable gains from 0 to 30 dB can be set:
Automatic level control for main microphone or submicrophone input. The gain step is 1 dB.
Level control by register for line-in or carkit input, or headset microphone. The gain step is 6 dB.
The amplification stage outputs are connected to the ADC input (ADC left and right).
The USB-CEA carkit uses the DP pad to input the audio signal.
The MCPC carkit uses the TXAF analog pad to input the audio signal.
Figure 6-28 shows the uplink carkit full path uplink characteristics for audio and USB.
Figure 6-28. Carkit Input Uplink Path Characteristics
Table 6-22 lists the electrical characteristics of the MCPC and USB-CEA carkit audio.
Audio/Voice Module
93
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