WM8581(2005) View Datasheet(PDF) - Wolfson Microelectronics plc

Part Name

Description

View to exact match

WM8581
(Rev.:2005)

Multichannel CODEC with S/PDIF Transceiver

Wolfson Microelectronics plc 

Production Data

WM8581

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 no

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

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

5. 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.

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

MASTER CLOCK TIMING

ADCMCLK/

MCLK

t MCLKL

tMCLKH

t MCLKY

Figure 1 Master Clock Timing Requirements

Test Conditions

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

PARAMETER

SYMBOL

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

TEST CONDITIONS

MIN

TYP

11

11

28

40:60

Table 3 Master Clock Timing Requirements

MAX

60:40

UNIT

ns

ns

ns

w

PD Rev 4.0 April 2007

15

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