ADC1 USB - Performance

Frequency Response

The above graphs show the frequency response of the ADC1 when it is operating at a 192-kHz sample rate. Note that the amplitude response is down by less than 0.05 dB at 10 Hz and 80 kHz. The bass response extends well below the 10-Hz limitation of the measurement equipment, and the high-frequency analog response extends well above the 96 kHz bandwidth of 192 kHz digital audio.

Inter-Channel Phase Response

This graph shows that the differential phase is significantly better than ± 0.25° from 10 Hz to 20 kHz.

THD+N vs. Level 1kHz

This graph shows that, below -4 dBFS, distortion is lower than the noise floor of the converter. Above -3 dBFS, distortion reaches a maximum value of only -107 dBFS.

32K B-H FFT, Idle Channel Noise

This graph demonstrates that the ADC1 is free from idle tones and clock crosstalk. The highest spurious tone measures -128 dBFS and is AC line related hum. The highest non-line related tone measures -135 dBFS.

32K B-H FFT, -3 dBFS, 1 KHz

This FFT plot shows that the ADC1 has very little harmonic distortion. Distortion is exceptionally low and is dominated by 2nd harmonic distortion. Note the near absence of spurious tones.

32K B-H FFT, -3 dBFS, 10 KHz

This FFT plot shows that the ADC1 is free from jitter-induced sidebands. Any jitter present at the conversion sampling circuit would produce sidebands equally spaced above and below the 10 kHz test tone. The tone at 20 kHz is due to second harmonic distortion, and measures almost 120 dB below full scale. Note the near absence of spurious tones.