Datasheet

DigitalPGA
Gain=0dB
AnalogPGA
Gain=0dB
Amp
0dB
DAC
1.35VPP
0dBFs
USB
Amp
–0.6dB
032-027
TPS65950
www.ti.com SWCS032E–OCTOBER 2008–REVISED JANUARY 2011
NOTE
For other component values, see Table 15-1.
Example of ferrite: BLM 18BD221SN1.
6.1.7 Carkit Output
The USB-CEA carkit uses the DP/DM pad to output audio signals (see the CEA-936A: Mini-USB Analog
Carkit Interface Specification).
The MCPC carkit uses the RXAF analog pad to output audio signals.
Figure 6-14 shows the carkit output downlink full path characteristics for audio and USB.
Figure 6-14. Carkit Output Downlink Path Characteristics
Table 6-10 lists the electrical characteristics of the MCPC and USB-CEA carkit audio.
Table 6-10. MCPC and USB-CEA Carkit Audio Downlink Electrical Characteristics
Parameter Conditions Min Typ Max Unit
Output load USB-CEA (DP/DM) 20 kΩ
MCPC (RXAF) 5
Gain range
(1)
Audio path –92 30 dB
Voice path –66 30
Absolute gain error At 1 kHz –1 1 dB
Peak-to-peak differential output voltage (0 dBFs) Gain = 0 dB 1.5 V
PP
Total harmonic distortion At 0 dBFs –80 –75 dB
At –6 dBFs –74 –69
At –20 dBFs –70 –65
At –60 dBFs –30 –25
THD+N (20 Hz to 20 kHz, A-weighted) At 0 dBFs 60 dB
Idle channel noise (20 Hz to 20 kHz, A-weighted), default gain USB-CEA –77 dBFs
setting
(2)
MCPC –80 –77
Output PSRR 20 Hz to 20 kHz 60 dB
Supply voltage (VINTANA1) 1.5 V
Common mode output voltage for USB-CEA 1.3 1.35 1.4 V
Isolation between D+/D– during audio mode (20 Hz to 20 kHz) 60 dB
Crosstalk between right and left channels USB-CEA stereo –90 dB
Crosstalk RX/TX (1 V
PP
output) USB-CEA mono/stereo –60 dB
MCPC –65
Signal noise ratio (20 Hz to 20 kHz, A-weighted) At 0 dBFs 60 dB
(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 (USB-CEA and MCPC) = –1 dB
(2) The default gain setting assumes the ARXPGA has 0-dB gain setting (volume control) and output driver at 0.6-dB gain setting.
Copyright © 2008–2011, Texas Instruments Incorporated Audio/Voice Module 79
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