WM8786 查看數據表（PDF） - Wolfson Microelectronics plc

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产品描述 (功能)

生产厂家

WM8786

24-Bit, 192kHz Stereo ADC

Wolfson Microelectronics plc 

Production Data

DIGITAL FILTER CHARACTERISTICS

The WM8786 digital filter characteristics scale with sample rate.

WM8786

PARAMETER

TEST CONDITIONS

ADC Sample Rate (Single Rate - 48Hz typically)

Passband

+/- 0.005dB

-6dB

Passband Ripple

Stopband

Stopband Attenuation

f > 0.546fs

Group Delay

ADC Sample Rate (Dual Rate - 96kHz typically)

Passband

+/- 0.005dB

-6dB

Passband Ripple

Stopband

Stopband Attenuation

f > 0.546fs

Group Delay

ADC Sample Rate (Quad Rate - 192kHz typically)

Passband

+/- 0.005dB

-3dB

-6dB

Passband Ripple

Stopband

Stopband Attenuation

f > 0.75fs

Group Delay

ADC High Pass Filter

Corner Frequency

-3dB

-0.5dB

-0.1dB

Table 1 Digital Filter Characteristics

MIN

0

0.546fs

-85

0

0.546fs

-85

0

0.75fs

-85

TYP

0.5fs

32/fs

0.5fs

32/fs

0.45fs

0.5fs

10/fs

3.7

10.4

21.6

MAX

UNIT

0.454fs

+/- 0.005

dB

dB

s

0.454fs

+/- 0.005

dB

dB

s

0.25fs

+/- 0.005

dB

dB

s

Hz

TERMINOLOGY

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

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

HIGH PASS FILTER TRANSFER CHARACTERISTIC

The high pass filter response is defined by the following polynomial:

H(z)

=

1

-

1- z-1

(1-α )z

-1

where α = 2-11 for single rate (48k) mode

α = 2-12 for dual rate (96k) mode

α = 2-13 for quad rate (192k) mode

w

PD Rev 4.2 February 2007

11

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