- Texas AIP Consumer Audio User's Guide

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5.4.1 Digital-to-Analog (D/A) Performance
Measurements for Dynamic Characteristics
Measurement path: 01.Line Output and Headphone Output
csv file: 01_DAC_Line_Output_and_Headphone_Output.csv
Table 5-1. D/A Line Output Parameters
Power Supply Parameter Filter Setting R
L
(k Ω ) LOL LOR
3.3V THD+N (0dBFS at 1kHz) 400Hz—20kHz AES-17 10 0.007% 0.008%
SNR (BPZ input) 22Hz—20kHz SPCL + 10 93.1dB 93.0dB
A-weighting
DR (–60dBFS input) 22Hz—20kHz SPCL + 10 93.1dB 92.9dB
A-weighting
Channel Separation 22Hz—20kHz AES-17 10 90.5dB 90.4dB
(BPZ input for target
channel)
Table 5-2. 16 Ω Headphone Output Inserted in Headphone Jack J6
Power Supply Parameter Filter Setting R
L
( Ω ) HPOL HPOR
3.3V THD+N (40mW, HP 400Hz—20kHz AES-17 16 0.028% 0.027%
volume = –1dB)
SNR (BPZ input) 22Hz—20kHz SPCL + 16 93.1dB 93.0dB
A-weighting
DR (–60dBFS input) 22Hz—20kHz SPCL + 16 93.4dB 93.1dB
A-weighting
To obtain the performance results shown in Table 5-1 and Table 5-2 , the speaker module should be
powered down, and other functions should be set with these parameters:
• Speaker Amp: Disabled
• ADC L-channel and ADC R-channel: Disabled
• ALC: Off
• Volume: 0dB
• Analog mixing: Disabled
• R
L
= 10k Ω for the line output
• R
L
= 16 Ω inserted in the J6 headphone jack for the headphone output
The bundled .csv file automatically sets the device to these conditions.
Note: The headphone volume should be changed from 0dB to –1dB and the signal input level of
the Audio Precision analyzer should be changed to 40mW output power when THD+N is
measured at 16 Ω .
See Appendix A : Line Output and Headphone Output for a signal flow block diagram.
Evaluation and Measurements56 SBAU127 – July 2007
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