WM8950 datasheet(45/52 Pages) WOLFSON

Il numero della parte	WM8950

Spiegazioni elettronici	ADC WITH MICROPHONE INPUT AND PROGRAMMABLE DIGITAL FILTERS

PDF	52 Pages

Scroll/Zoom	100%

Produttore elettronici	WOLFSON [Wolfson Microelectronics plc]

Homepage	http://www.wolfsonmicro.com

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Preliminary Technical Data

WM8950

PTD Rev 2.1 June 2005

HIGHPASS FILTER

The WM8950 has a selectable digital highpass filter in the ADC filter path.

This filter has two

modes, audio and applications. In audio mode the filter is a 1

st order IIR with a cutoff of around

3.7Hz.

In applications mode the filter is a 2

nd order high pass filter with a selectable cutoff

frequency.

-40

-35

-30

-25

-20

-15

-10

-5

5 10

1520

2530

3540

Frequency (Hz)

-60

-50

-40

-30

-20

-10

200

400

600

800

1000

1200

Frequency (Hz)

Figure 34 ADC Highpass Filter Response, HPFAPP=0

Figure 35 ADC Highpass Filter Responses (48kHz),

HPFAPP=1, all cutoff settings shown.

-80

-70

-60

-50

-40

-30

-20

-10

200

400

600

800

1000

1200

Frequency (Hz)

-90

-80

-70

-60

-50

-40

-30

-20

-10

200

400

600

800

1000

1200

Frequency (Hz)

Figure 36 ADC Highpass Filter Responses (24kHz),

HPFAPP=1, all cutoff settings shown.

Figure 37 ADC Highpass Filter Responses (12kHz),

HPFAPP=1, all cutoff settings shown.

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