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參數資料
型號: TPS65950ZXNT
廠商: TEXAS INSTRUMENTS INC
元件分類: 消費家電
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: 145/167頁
文件大小: 2566K
代理商: TPS65950ZXNT
6.1.8
Digital Audio Filter Module
Low-pass
filter
Digital
modulator
Randomizer
High-pass
filter
Audiointerface
DAC
032-028
TPS65950
Integrated Power Management/Audio Codec
www.ti.com
SWCS032 – OCTOBER 2008
Table 6-10. MCPC and USB-CEA Carkit Audio Downlink Electrical Characteristics
Parameter
Conditions
Min(1)
Typ(2)
Max(3)
Unit
Output load
USB-CEA (DP/DM)
20
k
MCPC (RXAF)
5
Gain range(4)
Audio path
–92
30
dB
Voice path
–66
30
Absolute gain error
At 1 kHz
–1
1
dB
Peak-to-peak differential output voltage (0 dBFs)
Gain = 0 dB
1.5
VPP
Total harmonic distortion
At 0 dBFs
–80
–75
dB
At –6 dBFs
–74
–69
At –20 dBFs
–70
–65
At –60 dBFs
–30
–25
THD+N (20 Hz to 20 kHz, A-weighted)
At 0 dBFs
60
dB
Idle channel noise (20 Hz to 20 kHz, A-weighted)
Default gain(5)
–90
–85
dB
Output PSRR
20 Hz to 20 kHz
60
dB
Supply voltage (VINTANA1)
1.5
V
Common mode output voltage for USB-CEA
1.3
1.35
1.4
V
Isolation between D+/D– during audio mode (20 Hz to 20 kHz)
60
dB
Crosstalk between right and left channels
USB-CEA stereo
–90
dB
Crosstalk RX/TX (1 VPP output)
USB-CEA mono/stereo
–60
dB
MCPC
–65
Signal noise ratio (20 Hz to 20 kHz, A-weighted)
At 0 dBFs
60
dB
Phone speaker amplifier output impedance at 1 kHz
USB-CEA (DP/DM)
200
MCPC (RXAF)
200
(1)
Min = Minimum value
(2)
Typ = Typical value
(3)
Max = Maximum value
(4)
Audio digital filter = –62 to 0 dB (1-dB steps) and 0 to 12 dB (6-dB steps);
Voice digital filter = –36 to 12 dB (1-dB steps);
ARXPGA (volume control) = –24 to 12 dB (2-dB steps);
Output driver (USB-CEA and MCPC) = –1 dB
(5)
The default gain setting assumes the ARXPGA has 0-dB gain setting (volume control) and output driver at 0.6-dB gain setting.
Figure 6-15 shows the digital audio filter downlink full path characteristics for the audio interface.
Figure 6-15. Digital Audio Filter Downlink Path Characteristics
The HPF can be bypassed.
Table 6-11 lists the audio filter frequency responses relative to reference gain at 1 kHz.
Audio/Voice Module
79
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