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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： 131/167頁
文件大小： 2566K
代理商： TPS65950ZXNT
6.1
Audio/Voice Downlink (RX) Module
6.1.1
Earphone Output
6.1.1.1 Earphone Output Characteristics
DigitalPGA
Gain=0dB
AnalogPGA
Gain=2dB
Amp
6dB
DAC
4.0Vppdiff
0dBFs
032-015
TPS65950
Integrated Power Management/Audio Codec
SWCS032 – OCTOBER 2008
www.ti.com
The audio/voice module includes the following output stages:
Mono/stereo single-ended headset amplifier
Stereo differential integrated class-D 8- hands-free amplifiers
Predriver output signals for external class-D amplifiers (single-ended)
Mono differential earpiece amplifier
Vibrator H-bridge
Analog signals from the audio and/or voice interface are fed to the earphone amplifier. This amplifier, with
different gains, provides a full differential signal on terminals EARP and EARM. Figure 6-2 shows the
earphone amplifier. Table 6-1 lists the characterstics of the earphone amplifier.
Figure 6-2. Earphone Amplifier
Table 6-1. Earphone Amplifier Output Characteristics
Parameter
Test Conditions
Min(1)
Typ(2) Max(3)
Unit
Differential load impedance
26
32
100
pF
Gain range (4)
Audio path
–86
36
dB
Voice path
–60
36
Absolute gain error
–1
1
dB
Maximum output power
At 1.4 Vrms differential output voltage
61.25
mW
Load impedance = 32
Peak-to-peak differential output voltage (0 dBFs)
Default gain (5)
4.0
VPP
Total harmonic distortion
At 0 dBFs
–65
–60
dB
Default gain (5)
At –6 dBFs
–70
–65
Load impedance = 32
At –20 dBFs
–60
At –60 dBFs
–30
Idle channel noise
Gain = 0 dB
–90
–85
dBFs
(20 Hz to 20 kHz, A-weighted)
Load = 32
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 = 0, 6, 12 dB
(5)
The default gain setting assumes the ARXPGA has 2-dB gain setting (volume control) and output driver at 6-dB gain setting.
Audio/Voice Module
66
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