Production Data

WM8955BL

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PD Rev 4.1 February 2007

7

Test Conditions

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Analogue Reference Levels

Midrail Reference Voltage

VMID

–3%

AVDD/2

+3%

V

Buffered Reference Voltage

VREF

–3%

AVDD/2

+3%

V

Digital Input / Output

Input HIGH Level

0.7

×DBVDD

V

Input LOW Level

0.3

×DBVDD

V

Output HIGH Level

0.9

×DBVDD

V

Output LOW Level

0.1

×DBVDD

V

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) - DR 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 rms 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.