WM8974 datasheet(57/63 Pages) WOLFSON

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WM8974

PP Rev 1.1 September 2004

5-BAND EQUALISER

The WM8974 has a 5-band equaliser which can be applied to either the ADC path or the DAC path.

The plots from Figure 42 to Figure 55 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 42 EQ Band 1 – Low Frequency Shelf Filter Cut-offs Figure 43 EQ Band 1 – Gains for Lowest Cut-off Frequency

-1

-15

-10

-5

Frequency (Hz)

-1

-15

-10

-5

Frequency (Hz)

Figure 44 EQ Band 2 – Peak Filter Centre Frequencies,

EQ2BW=0

Figure 45 EQ Band 2 – Peak Filter Gains for Lowest Cut-off

Frequency, EQ2BW=0

-2

-1

-15

-10

-5

Frequency (Hz)

Figure 46 EQ Band 2 – EQ2BW=0, EQ2BW=1

WM8974 Datasheet(PDF) 57 Page - Wolfson Microelectronics plc

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