Datasheet

PreDriverD
Onboard
Chip
ClassD
(TPA2010D1...)
IN+
IN–
Closedto
external
classC
C /C
PL PR
032-025
C /C
PR.O PL.O
R /R
PL.O PR.O
C /C
PL.M PR.M
R /R
PR PL
R /R
PR.M PL.M
TPS65950
www.ti.com SWCS032E–OCTOBER 2008–REVISED JANUARY 2011
Table 6-8. Predriver Output Characteristics
Parameter Test Conditions Min Typ Max Unit
Load impedance 10 kΩ
50 pF
Gain range
(1)
Audio path –92 30 dB
Voice path –66 30
Absolute gain error –1 1 dB
Peak-to-peak output voltage (0 dBFs) Default gain
(2)
1.5 V
PP
Total harmonic distortion At 0 dBFs –80 –75 dB
Default gain
(2)
At –6 dBFs –74 –69
Load > 10 kΩ // 50 pF At –20 dBFs –70 –65
At –60 dBFs –30 –25
Default gain
(3)
–90 –85 dB
Idle channel noise (20 Hz to 20 kHz, A-weighted)
Load = 10 Ω
SNR (A-weighted over 20-kHz bandwidth) At 0 dBFs 83 88 dB
Default gain
(3)
At –60 dBFS 30
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 = –6, 0, 6 dB
(2) The default gain setting assumes the ARXPGA has a 0 dB gain setting (volume control) and output driver has a 0 dB gain setting.
(3) The default gain setting assumes the ARXPGA has a 0 dB gain setting (volume control) and output driver has a 0 dB gain setting.
6.1.5.2 External Components and Application Schematic
Figure 6-12 is a simplified schematic of the external class-D predriver.
Figure 6-12. Predriver for External Class D
In Figure 6-12, input resistor (R
PR
or R
PL
) sets the gain of the external class D. For TPS2010D1, the gain
is defined according to the following equation:
Gain (V/V) = 2*150*10
3
/(R
PR
or R
PL
)
R
PR
or R
PL
> 15 kΩ
Copyright © 2008–2011, Texas Instruments Incorporated Audio/Voice Module 77
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