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WM8960GEFL/V bảng dữ liệu(PDF) 84 Page - Wolfson Microelectronics plc

tên linh kiện WM8960GEFL/V
Giải thích chi tiết về linh kiện  Stereo CODEC with 1W Stereo Class D Speaker Drivers and Headphone Drivers for Portable Audio Applications
PDF  88 Pages
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nhà sản xuất  WOLFSON [Wolfson Microelectronics plc]
Trang chủ  http://www.wolfsonmicro.com
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WM8960GEFL/V bảng dữ liệu(HTML) 84 Page - Wolfson Microelectronics plc

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WM8960
Preliminary Technical Data
w
PTD, September 2006, Rev 2.0
84
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
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 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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