WM8976 datasheet(77/83 Pages) WOLFSON

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Preliminary Technical Data

WM8976

PTD Rev 2.0 February 2005

5-BAND EQUALISER

The WM8976 has a 5-band equaliser which can be applied to either the ADC path or the DAC path.

The plots from Figure 48 to Figure 61 show the frequency responses of each filter with a sampling

frequency of 48kHz, firstly showing the different cut-off/centre frequencies with a gain of

±12dB, and

secondly a sweep of the gain from -12dB to +12dB for the lowest cut-off/centre frequency of each

filter.

-1

-15

-10

-5

Frequency (Hz)

-1

-15

-10

-5

Frequency (Hz)

Figure 48 EQ Band 1 Low Frequency Shelf Filter Cut-offs

Figure 49 EQ Band 1 Gains for Lowest Cut-off Frequency

-1

-15

-10

-5

Frequency (Hz)

-1

-15

-10

-5

Frequency (Hz)

Figure 50 EQ Band 2 – Peak Filter Centre Frequencies,

EQ2BW=0

Figure 51

EQ Band 2 – Peak Filter Gains for Lowest Cut-off

Frequency, EQ2BW=0

-2

-1

-15

-10

-5

Frequency (Hz)

Figure 52 EQ Band 2 – EQ2BW=0, EQ2BW=1

WM8976 Datasheet(PDF) 77 Page - Wolfson Microelectronics plc

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