Preliminary Technical Data

WM8737L

w

AI Rev 3.0 May 2004

33

DIGITAL FILTER CHARACTERISTICS

The WM8737L has four different types of digital filter characteristics to suit different MCLK and

sample rates (see Master Clock and Audio Sample Rates).

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

ADC Filter Type A

+/- 0.05dB

0

0.4535fs

Passband

-6dB

0.5fs

Passband Ripple

+/- 0.05

dB

Stopband

0.5465fs

Stopband Attenuation

f > 0.5465fs

-60

dB

High Pass Filter Corner

Frequency

-3dB

-0.5dB

-0.1dB

3.7

10.4

21.6

Hz

Table 22 Digital Filter Characteristics

TERMINOLOGY

Stop Band Attenuation (dB) - the degree to which the frequency spectrum is attenuated (outside audio band)

Pass-band Ripple – any variation of the frequency response in the pass-band region

The filter responses are shown on the following page.