Datasheet

PreDriverD
Onboard
Chip
ClassD
(TPA2010D1...)
IN+
IN–
Closedto
external
ClassC
C /C
PL PR
037-054
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
TPS65930/TPS65920
SWCS037G–MAY 2008– REVISED APRIL 2011 www.ti.com
6.1.1.1 Predriver Output Characteristics
Table 6-1 lists the predriver output characteristics.
Table 6-1. 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 = –3 to 12 dB (1-dB steps)
ARXPGA (volume control) = –24 to 12 dB (2-dB steps)
Output driver = –6 dB, 0 dB, 6 dB
(2) The default gain setting assumes the ARXPGA has 0-dB gain setting (volume control) and output driver at 0-dB gain setting.
(3) The default gain setting assumes the ARXPGA has 0-dB gain setting (volume control) and output driver at 0-dB gain setting.
6.1.1.2 External Components and Application Schematics
Figure 6-2 is a simplified schematic for the external class-D predriver.
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
Figure 6-2. Predriver for External Class D
56 Audio/Voice Module (TPS65930 Device Only) Copyright © 2008–2011, Texas Instruments Incorporated
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