Cirrus-logic CapturePlus II Manual do Utilizador descarregar pdf (Página 24)

CapturePlus II

24 DS789UM2

APPENDIX A. TESTING THE CIRRUS LOGIC CDB556x/7x/8x EVALUATION BOARD

The following sections describe several basic tests performed to establish basic system functionality and

baseline noise and distortion levels.

A.1 Baseline Testing for Noise & Distortion

A.1.1 Baseline Noise & Distortion Test - Non-Averaged FFT

Connect the evaluation board power inputs to a bench supply having the appropriate voltages.

Connect the evaluation board’s analog input(s) to circuit ground (in most cases, the 50 Ω termination re-

sistors on the input will be adequate).

Select the Frequency Domain window (selected by clicking on the Frequency Domain tab at the top of the

screen). Activate the Grounded Input FFT and Log Freq Scale buttons. Select the Window Type to be

Crystal 7-Term.

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Cirrus-logic CapturePlus II Manual do Utilizador Página 24