WM8580 datasheet(12/97 Pages) WOLFSON

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WM8580

Production Data

PD Rev 4.3 August 2007

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.

MASTER CLOCK TIMING

ADCMCLK/

MCLK

MCLKL

MCLKH

MCLKY

Figure 1 Master Clock Timing Requirements

Test Conditions

AVDD, PVDD, VREFP = 5V, DVDD = 3.3V, AGND, VREFN = 0V, PGND, DGND = 0V, TA = +25

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

System Clock Timing Information

ADCMCLK and MCLK System clock

pulse width high

tMCLKH

ADCMCLK and MCLK System clock

pulse width low

tMCLKL

ADCMCLK and MCLK System clock

cycle time

tMCLKY

ADCMCLK and MCLK Duty cycle

40:60

60:40

Table 3 Master Clock Timing Requirements

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