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WM8960 データシート(PDF) 86 Page - Wolfson Microelectronics plc

部品番号 WM8960
部品情報  Stereo CODEC with 1W Stereo Class D Speaker Drivers and Headphone Drivers for Portable Audio Applications
PDF  92 Pages
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メーカー  WOLFSON [Wolfson Microelectronics plc]
ホームページ  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8960 データシート(HTML) 86 Page - Wolfson Microelectronics plc

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WM8960
Production Data
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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 / 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 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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