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WM8961GEFL/V Datasheet(PDF) 108 Page - Wolfson Microelectronics plc |
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WM8961GEFL/V Datasheet(HTML) 108 Page - Wolfson Microelectronics plc |
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108 / 116 page  WM8961 Pre-Production w PP, August 2009, Rev 3.1 108 SPEAKER SELECTION For filter-less 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 πL e.g. for an 8 Ω speaker and required cut-off frequency of 20kHz, the speaker should be chosen to have an inductance of: L = RL / 2 πfc = 8Ω / 2π * 20kHz = 64μH 8 Ω speakers typically have an inductance in the range 20μH to 100μH. 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 WM8961 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. Figure 65 Speaker Equivalent Circuit |
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