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WM1811A bảng dữ liệu(PDF) 138 Page - Wolfson Microelectronics plc

tên linh kiện WM1811A
Giải thích chi tiết về linh kiện  Multi-Channel Audio Hub CODEC for Smartphones
PDF  328 Pages
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nhà sản xuất  WOLFSON [Wolfson Microelectronics plc]
Trang chủ  http://www.wolfsonmicro.com
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WM1811A bảng dữ liệu(HTML) 138 Page - Wolfson Microelectronics plc

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WM1811A
Production Data
w
PD, November 2013, Rev 4.1
138
The measurement accuracy of the microphone detect function is assured whenever the connected
load is within the applicable limits specified in the “Electrical Characteristics”. Note that a 2.2k
 (2%)
resistor must also be connected between MICDET and MICBIAS2.
Note that the connection of a microphone will change the measured impedance on the MICDET pin;
see “Applications Information” for recommended components for typical applications.
The measurement time varies between 100
s and 500s according to the impedance of the external
load. A high impedance will be measured faster than a low impedance.
The timing of the microphone detect function is illustrated in Figure 42. Two different cases are
shown, according to whether MICBIAS2 is enabled periodically by the impedance measurement
function (MICB2_ENA=0), or is enabled at all times (MICB2_ENA=1).
Figure 42 Microphone Detect Timing



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