Datasheet

TPS65950
www.ti.com SWCS032E–OCTOBER 2008–REVISED JANUARY 2011
Table 6-2. 8-Ω Stereo Hands-Free Output Characteristics (continued)
Parameter Test Conditions Min Typ Max Unit
Gain range
(1)
Audio path –75.6 34.4 dB
Voice path –49.6 34.4
Absolute gain error –1 1 dB
Maximum output power (load impedance = 8 Ω) VBAT > 3.6 V 400 mW
VBAT > 4.0 V 700
Peak-to-peak differential output voltage VBAT > 3.6 V (0 dBFs) 5.0 V
PP
VBAT > 4.0 V (2 dBFs) 6.25
At 0 dBFs –60 –40 dBFs
Total harmonic distortion (load impedance = 8 Ω, gain setting = 0
dB) At –10 dBFs –60
(VBAT > 3.6 V)
At –20 dBFs –45
At –60 dBFs –20
Total harmonic distortion (load impedance = 8 Ω, (VBAT > 4.2 V) 2 dBFs –60 –40 dB
Idle channel noise (20 Hz to 20 kHz) 0 dB gain –88 dBFs
PSRR (input signal 1 kHz sine, 300 mVPP GSM ripple at 217 Hz From VBAT 75 80 dB
with 10-μs rise/fall times, at 12.5% duty cycle)
Power on load = 400 mW 70%
Efficiency
Load impedance = 8 Ω
Power dissipation Power on load = 400 mW 175 mW
Load impedance = 8 Ω
Idle current consumption on VBAT Without input signal 6 mA
Clock frequency for the ramp generation 384 426.6 kHz
I
DDQ
current At 25°C 0.6 μA
(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 = 10.4 dB
6.1.2.1.1 Short-Circuit Protection
There is short-circuit protection for hands-free amplifiers to limit power dissipation to 1.2 W. The
short-circuit protection can be disabled by register. If a short circuit is detected, the short-circuit detection
block switches off the hands-free speaker output stages. A software restart is required to restart the
class-D amplifier.
6.1.2.2 External Components and Application Schematic
Figure 6-5 is a simplified schematic of the 8-Ω stereo hands-free.
Copyright © 2008–2011, Texas Instruments Incorporated Audio/Voice Module 69
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