Production Data

WM8721 / WM8721L

w

PD Rev 4.0 November 2004

31

Note: All other bits not explicitly defined in the register table should be set to zero unless

specified otherwise (see Powerdown section).

DIGITAL FILTER CHARACTERISTICS

The DAC employs different digital filters. There are 4 types of digital filter, called Type 0, 1, 2 and 3.

The performance of Types 0 and 1 is listed in the table below, the responses of all filters is shown in

the proceeding pages.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

DAC Filter Type 0 (USB mode, 250fs operation)

+/- 0.03dB

0

0.416fs

Passband

-6dB

0.5fs

Passband Ripple

+/-0.03

dB

Stopband

0.584fs

Stopband Attenuation

f > 0.584fs

-50

dB

DAC Filter Type 1 (USB mode, 272fs or Normal mode operation)

+/- 0.03dB

0

0.4535fs

Passband

-6dB

0.5fs

Passband Ripple

+/- 0.03

dB

Stopband

0.5465fs

Stopband Attenuation

f > 0.5465fs

-50

dB

Table 21 Digital Filter Characteristics