CS47L85 datasheet(28/370 Pages) CIRRUS

28 / 370 page

CS47L85

Rev 4.3

TERMINOLOGY

Signal-to-Noise Ratio (dB)

– SNR is a measure of the difference in level between the maximum full scale output signal and the output with

no input signal applied.

Total Harmonic Distortion (dB)

– THD is the ratio of the RMS sum of the harmonic distortion products in the specified bandwidth (see note

below) relative to the RMS amplitude of the fundamental (i.e., test frequency) output.

Total Harmonic Distortion plus Noise (dB)

– THD+N is the ratio of the RMS sum of the harmonic distortion products plus noise in the

specified bandwidth (see note below) relative to the RMS amplitude of the fundamental (i.e., test frequency) output.

Power Supply Rejection Ratio (dB) - PSRR is the ratio of a specified power supply variation relative to the output signal that results from it.

PSRR is measured under quiescent signal path conditions.

Common Mode Rejection Ratio (dB)

– CMRR is the ratio of a specified input signal (applied to both sides of a differential input), relative to

the output signal that results from it.

Channel Separation (L/R) (dB)

– left-to-right and right-to-left channel separation is the difference in level between the active channel (driven

to maximum full scale output) and the measured signal level in the idle channel at the test signal frequency. The active channel is configured

and supplied with an appropriate input signal to drive a full scale output, with signal measured at the output of the associated idle channel.

Multi-Path Crosstalk (dB)

– is the difference in level between the output of the active path and the measured signal level in the idle path at

the test signal frequency. The active path is configured and supplied with an appropriate input signal to drive a full scale output, with signal

measured at the output of the specified idle path.

Mute Attenuation

– This is a measure of the difference in level between the full scale output signal and the output with mute applied.

All

performance measurements are specified with a 20kHz low pass ‘brick-wall’ filter and, where noted, an A-weighted filter. Failure to use

these filters will result in higher THD and lower SNR readings than are found in the Electrical Characteristics. The low pass filter removes

out-of-band noise.

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