WM8978GEFLSLASHV datasheet(72/78 Pages) WOLFSON

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WM8978

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PP Rev 1.7 January 2005

5-BAND EQUALISER

The WM8978 has a 5-band equaliser which can be applied to either the ADC path or the DAC path.

The plots from Figure 41 to Figure 54 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 41 EQ Band 1 Low Frequency Shelf Filter Cut-offs

Figure 42 EQ Band 1 Gains for Lowest Cut-off Frequency

-1

-15

-10

-5

Frequency (Hz)

-1

-15

-10

-5

Frequency (Hz)

Figure 43 EQ Band 2 – Peak Filter Centre Frequencies,

EQ2BW=0

Figure 44

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

Frequency, EQ2BW=0

-2

-1

-15

-10

-5

Frequency (Hz)

Figure 45 EQ Band 2 – EQ2BW=0, EQ2BW=1

WM8978GEFL/V Datasheet(PDF) 72 Page - Wolfson Microelectronics plc

WM8978GEFL/V Datasheet(HTML) 72 Page - Wolfson Microelectronics plc

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