WM8956 查看數據表（PDF） - Wolfson Microelectronics plc

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WM8956

Hi-Fi DAC with 1W Stereo Class D Speaker Drivers and Headphone Drivers

Wolfson Microelectronics plc 

Production Data

APPLICATIONS INFORMATION

RECOMMENDED EXTERNAL COMPONENTS

WM8956

SPEAKER SELECTION

For filterless operation, it is important to select a speaker with appropriate internal inductance. The

internal inductance and the speaker's load resistance create a low-pass filter with a cut-off frequency

of:

fc = RL / 2L

e.g. for an 8 speaker and required cut-off frequency of 20kHz, the speaker should be chosen to

have an inductance of:

L = RL / 2fc = 8 / 2 * 20kHz = 64H

8 speakers typically have an inductance in the range 20H to 100H. Care should be taken to

ensure that the cut-off frequency of the speaker's internal filtering is low enough to prevent speaker

damage. The class D outputs of the WM8956 operate at much higher frequencies than is

recommended for most speakers, and the cut-off frequency of the filter should be low enough to

protect the speaker.

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PD, November 2011, Rev 4.1

75

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