- Texas AIP Consumer Audio User's Guide

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5.4.2 Analog-to-Digital (A/D) Performance
5.4.3 Speaker Output Power Performance
Measurements for Dynamic Characteristics
Measurement path: 17.Line Input (AIN3L/AIN3R)
csv file: 17_ADC_Line_Input.csv
Table 5-3. A/D Line Input Parameters
Power Supply Parameter Filter Setting Left Channel Right Channel
3.3V THD+N ( –1dB at 1kHz) 400Hz—20kHz AES-17 0.009% 0.009%
SNR (BPZ input) 22Hz—20kHz SPCL + 90.4dB 90.5dB
A-weighting
DR (–60dBFS input) 22Hz—20kHz AES-17 + 90.6dB 90.3dB
A-weighting
Channel Separation 22Hz—20kHz AES-17 87.8dB 87.8dB
(BPZ input for target channel)
To obtain the performance results shown in Table 5-3 , the speaker/headphone module should be powered
down, and other functions should be set with these parameters:
• Headphone and Speaker Amp: Disabled
• DAC L-channel and DAC R-channel: Disabled
• ALC: Off
• Mic boost: 0dB
• Analog mixing: Disabled
• All PGA: 0dB
The bundled .csv file automatically sets the device to these conditions.
See Appendix A : Line Input (AIN3L/AIN3R) for a signal flow block diagram.
Measurement path: 07.Stereo Speaker Output
csv file: 07_DAC_Stereo_Speaker_Output_8ohms.csv
Table 5-4. Stereo Speaker Output Parameters
Power Supply Parameter Speaker Volume R
L
( Ω ) SPOL SPOR
3.3V Output Power +6dB 8 594.2mW 594.1mW
(THD+N = 10%)
To obtain the performance results shown in Table 5-4 , the headphone module should be powered down,
and other functions should be set with these parameters:
• Headphone Amp: Disabled
• ADC L-channel and ADC R-channel: Disabled
• Speaker volume: +6dB
• ALC: Off
• R
L
: 8 Ω
The bundled .csv file automatically sets the device to these conditions, except for the speaker volume;
adjust the speaker volume to +6dB manually after the .csv file is loaded.
Note: Adjust the input signal level of the Audio Precision analyzer to meet the target THD+N =
10%.
See Appendix A : Stereo Speaker Output for a signal flow block diagram.
SBAU127 – July 2007 Evaluation and Measurements 57
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