XWM8739SEDS/V Ver la hoja de datos (PDF) - Cirrus Logic

Número de pieza

componentes Descripción

Fabricante

XWM8739SEDS/V

Stereo Audio ADC

Cirrus Logic 

WM8739

Production Data

Notes

1. Ratio of output level with 1kHz full scale input, to the output level with all zero’s into the digital input over a 20Hz to

20kHz bandwidth using an Audio analyser.

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

a filter will result in higher THD+N 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.

3. VMID decoupled with 10uF and 0.1uF capacitors (smaller values may result in reduced performance).

TERMINOLOGY

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

a zero signal applied. (No ‘Auto-zero’ or Automute function is employed in achieving these results).

2. 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).

3. THD+N (dB) - THD+N is a ratio, of the r.m.s. values, of (Noise + Distortion)/Signal.

4. 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.

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PD, Rev 4.2, July 2008

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