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WM8960 Fiches technique(PDF) 86 Page - Wolfson Microelectronics plc |
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WM8960 Fiches technique(HTML) 86 Page - Wolfson Microelectronics plc |
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86 / 92 page ![]() WM8960 Production Data w PD, August 2013, Rev 4.2 86 APPLICATIONS INFORMATION RECOMMENDED EXTERNAL COMPONENTS 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 / 2L 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 / 2fc = 8 / 2 * 20kHz = 64H 8 speakers typically have an inductance in the range 20H to 100H. 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 WM8960 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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