Datasheet
DigitalPGA
Gain=0dB
AnalogPGA
Gain=2dB
Amp
6dB
DAC
4.0Vppdiff
0dBFs
032-015
TPS65950
www.ti.com
SWCS032E–OCTOBER 2008–REVISED JANUARY 2011
6.1 Audio/Voice Downlink (RX) Module
The audio/voice module includes the following output stages:
• Mono/stereo single-ended headset amplifier
• Stereo differential integrated class-D 8-Ω hands-free amplifiers
• Predriver output signals for external class-D amplifiers (single-ended)
• Mono differential earpiece amplifier
• Vibrator H-bridge
6.1.1 Earphone Output
6.1.1.1 Earphone Output Characteristics
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 output characterstics of the earphone amplifier.
Figure 6-2. Earphone Amplifier
Table 6-1. Earphone Amplifier Output Characteristics
Parameter Test Conditions Min Typ Max Unit
Differential load impedance 26 32 Ω
100 100 pF
Gain range
(1)
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 Ω
Peak-to-peak differential output voltage (0 dBFs) Default gain
(2)
4.0 V
PP
Total harmonic distortion At 0 dBFs –65 –60
Default gain
(2)
At –6 dBFs –70 –65 dB
Load impedance = 32 Ω 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 Ω
Output PSRR (for all gains) 20 Hz to 4 kHz 90
dB
20 Hz to 20 kHz 70
(1) 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
(2) The default gain setting assumes the ARXPGA has 2-dB gain setting (volume control) and output driver at 6-dB gain setting.
Copyright © 2008–2011, Texas Instruments Incorporated Audio/Voice Module 67
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