WM8590GEDSSLASHV datasheet(8/51 Pages) WOLFSON

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WM8590

Production Data

PD Rev 4.0 January 2006

Notes:

Ratio of output level with 1kHz full scale input, to the output level with all zeros into the digital input, measured ‘A’

weighted.

All performance measurements obtained with 20kHz low pass filter, and where noted an A-weight filter. Failure to use

such a filter will result in higher THD and lower SNR and Dynamic Range readings than are found in the Electrical

Characteristics. The low pass filter removes out of band noise; although it is not audible it may affect dynamic

specification values.

All performance measurements obtained using certain timings conditions (ADCLRC and DACLRC should be

synchronous with MCLK). Please refer to section ‘Digital Audio Interface’.

A better MUTE Attenuation can be achieved if the ADC gain is set to minimum.

All performance measurements specified for ADC and DAC operating in isolation.

TERMINOLOGY

Signal-to-noise ratio (dB) – SNR is a measure of the difference in level between the full scale output and the output

with no signal applied. (No Auto-zero or Automute function is employed in achieving these results).

Dynamic range (dB) – DNR is a measure of the difference between the highest and lowest portions of a signal.

Normally a THD+N measurement at 60dB below full scale. The measured signal is then corrected by adding the 60dB

to it. (e.g. THD+N @ -60dB= -32dB, DR= 92dB).

THD (dB) – THD is a ratio, of the rms values, of Distortion/Signal.

Stop band attenuation (dB) – Is the degree to which the frequency spectrum is attenuated (outside audio band).

Channel Separation (dB) – Also known as Cross-Talk. This is a measure of the amount one channel is isolated from

the other. Normally measured by sending a full scale signal down one channel and measuring the other.

Pass-Band Ripple – Any variation of the frequency response in the pass-band region.

The WM8590 employs CMOS switching levels on the digital interface input. Logic 0

VIL. Logic 1

VIH.

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