Datasheet

TPS65930/TPS65920
SWCS037G–MAY 2008– REVISED APRIL 2011 www.ti.com
Table 6-10. Uplink Characteristics (continued)
Parameter Test Conditions Min Typ Max Unit
Peak-to-peak single-ended input voltage (0 dBFs) For single-ended input 1.5 V
PP
0 dB gain setting
Input impedance
(2)
40k 70k Ω
Total harmonic distortion (sine wave at 1.02 kHz) At –1 dBFs –80 –75 dB
At –6 dBFs –74 –69
At –10 dBFs –70 –65
At –20 dBFs –60 –55
At –60 dBFs –20 –15
Idle channel noise 20 Hz to 20 kHz, A-weighted, gain = 0 dB –85 –78 dBFs
16 kHz: < 20 Hz to 7 kHz, gain = 0 dB –90
8 kHz: P-weighted voice, gain = 18 dB –87
16 kHz: < 20 Hz to 7 kHz, gain = 18 dB –82
Crosstalk A/D to D/A Gain = 0 dB –80 dB
Crosstalk path between two microphones –70 dB
Intermodulation distortion 2-tone method –60 dB
(2) Impedance varies in the specified range with gain selection.
6.2.4 Microphone Amplification Stage
The microphone amplification stages perform the single-to-differential conversion for single-ended inputs.
Two programmable gains from 0 dB to 30 dB can be set:
• Automatic level control for main microphone input. The gain step is 1 dB.
• Level control by register for line-in or carkit input. The gain step is 6 dB.
The amplification stage outputs are connected to the ADC input (ADC left and right).
66 Audio/Voice Module (TPS65930 Device Only) Copyright © 2008–2011, Texas Instruments Incorporated
Submit Documentation Feedback
focus.ti.com: TPS65930/TPS65920