參數(shù)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(shù)： 142/167頁
文件大小： 2566K
代理商： TPS65950ZXNR
6.1.5
Predriver for External Class-D Amplifier
6.1.5.1 Predriver Output Characteristics
TPS65950
Integrated Power Management/Audio Codec
SWCS032 – OCTOBER 2008
www.ti.com
Two predriver amplifiers provide a stereo signal on the PreD.LEFT and PreD.RIGHT terminals to drive an
external class-D amplifier. These terminals are available if a stereo, single-ended, ac-coupled headset is
used.
Table 6-8 lists the characteristics of the predriver.
Table 6-8. Predriver Output Characteristics
Parameter
Test Conditions
Min(1)
Typ(2) Max(3)
Unit
Load impedance
10
k
50
pF
Gain range (4)
Audio path
–92
30
dB
Voice path
–66
30
Absolute gain error
–1
1
dB
Peak-to-peak output voltage (0 dBFs)
Default gain (5)
1.5
VPP
Total harmonic distortion
At 0 dBFs
–80
–75
dB
Default gain (5)
At –6 dBFs
–74
–69
Load > 10 k
// 50 pF
At –20 dBFs
–70
–65
At –60 dBFs
–30
–25
Default gain (5)
–90
–85
dB
Idle channel noise (20 Hz to 20 kHz, A-weighted)
Load = 10
SNR (A-weighted over 20-kHz bandwidth)
At 0 dBFs
83
88
dB
Default gain(5)
At –60 dBFS
30
Output PSRR (for all gains)
20 Hz to 4 kHz
90
dB
20 Hz to 20 kHz
70
(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 = –6, 0, 6 dB
(5)
The default gain setting assumes the ARXPGA has 0 dB gain setting (volume control) and output driver at 0 dB gain setting.
76
Audio/Voice Module
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