Production Data

WM8501

w

PD, Rev 4.2, July 2009

7

6.

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

THD measurement at 60dB below full scale. The measured signal is then corrected by adding the 60dB to it. (e.g. THD @

-60dB= -32dB, DR= 92dB).

7.

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

8.

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

9.

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.

MASTER CLOCK TIMING

MCLK

t

MCLKL

t

MCLKH

t

MCLKY

Figure 1 Master Clock Timing Requirements

Test Conditions

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

System Clock Timing Information

MCLK Master clock pulse width high

8

ns

MCLK Master clock pulse width low

8

ns

MCLK Master clock cycle time

20

ns

MCLK Duty cycle

40:60

60:40

Time from MCLK stopping to power

down.

1.5

12

μs

DIGITAL AUDIO INTERFACE

Figure 2 Digital Audio Data Timing