Production Data
WM8501
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
tMCLKL
MCLK
tMCLKH
tMCLKY
Figure 1 Master Clock Timing Requirements
Test Conditions
VDD = 5V, GND = 0V, TA = +25oC, fs = 48kHz, MCLK = 256fs unless otherwise stated.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
System Clock Timing Information
MCLK Master clock pulse width high
MCLK Master clock pulse width low
MCLK Master clock cycle time
MCLK Duty cycle
tMCLKH
tMCLKL
tMCLKY
8
8
ns
ns
ns
20
40:60
1.5
60:40
12
Time from MCLK stopping to power
down.
μs
DIGITAL AUDIO INTERFACE
Figure 2 Digital Audio Data Timing
PD, Rev 4.2, July 2009
7
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