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參數資料
型號： TPS65950ZXNR
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： 162/167頁
文件大小： 2566K
代理商： TPS65950ZXNR
6.2.9
Digital Audio Filter Module
PDMfromdigital
microphoneinterface
Error
cancellation
A/Doutput
Audio
interface
SINCfilter
differentiator
4thorder
SINCfilter
integrator
4thorder
1storderhigh-
passfilter
Low-pass
filter
032-042
TPS65950
Integrated Power Management/Audio Codec
SWCS032 – OCTOBER 2008
www.ti.com
Table 6-22. MCPC and USB-CEA Carkit Audio Uplink Electrical Characteristics
Parameter
Test Conditions
Min(1)
Typ(2) Max(3)
Unit
Gain range (4)
–1
60
dB
USB-CEA default gain setting
–1.5
1.5
Absolute gain, 0 dBFs at 1.02 kHz (4) (5) (6)
dB
MCPC default gain setting
–1.5
1.5
Speech delay
Voice path
0.5
ms
Input common mode voltage (7)
USB-CEA
1.3
1.9
V
USB-CEA
8
120
Phone microphone amplifier input impedance at 1 kHz
k
MCPC
5
100
Peak-to-peak single-ended input voltage (0 dBFs)
Default setting
1.414
VPP
Total harmonic distortion (sine wave at 1 kHz), default gain setting
At –1 dBFs
–74
–60
dB
At –6 dBFs
At –10 dBFs
At –20 dBFs
At –60 dBFs
THD + N (20 Hz to 20 kHz, A-weighted)
At 0 dBFs
60
dB
Signal noise ratio (20 Hz to 20 kHz, A-weighted)
At 0 dBFs
60
dB
USB-CEA
–77
Idle channel noise (20 Hz to 20 kHz, A-weighted), default gain
dBFs
setting
MCPC
–80
–77
USB-CEA
50
Output PSRR (20 Hz to 20 kHz, A-weighted)
dB
MCPC
35
(1)
Min = Minimum value
(2)
Typ = Typical value
(3)
Max = Maximum value
(4)
Gain range is defined by: MCPC/CEA amplifier = 0.56 dB/–1.02 dB; Preamplifier = 0 to 30 dB; Filter = 0 to 31 dB (1-dB steps).
(5)
The CEA default gain setting assumes 0 dB on the preamplifier, 1 dB on digital filter, and MCPC/CEA amplifier at –1.02 dB.
(6)
The MCPC default gain setting assumes 0 dB on the preamplifier, 0 dB on digital filter, and MCPC/CEA amplifier at 0.56 dB.
(7)
Full-scale input voltage is 1 V minimum.
Figure 6-29 shows the digital audio filter uplink full path characteristics for the audio interface.
Figure 6-29. Digital Audio Filter Uplink Path Characteristics
The HPF can be bypassed. It is controlled by the MISC_SET_2 ATX_HPF_BYP bit, address 0x49.
Table 6-23 lists the audio filter frequency responses relative to reference gain at 1 kHz.
Table 6-23. Digital Audio Filter TX Electrical Characteristics
Parameter
Test Conditions
Min(1)
Typ(2)
Max(3)
Unit
Passband
0.0005
0.42
FS
Passband gain
In region 0.0005*FS to 0.42*FS
(4)
–0.25
0.25
dB
(1)
Min = Minimum value
(2)
Typ = Typical value
(3)
Max = Maximum value
(4)
FS is the sampling frequency (8, 11.025, 12, 16, 22.05, 24, 32, 44.1, or 48 kHz).
Audio/Voice Module
94
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