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WM7230IMSE/V Datasheet(PDF) 8 Page - Wolfson Microelectronics plc |
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WM7230IMSE/V Datasheet(HTML) 8 Page - Wolfson Microelectronics plc |
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8 / 12 page  WM7230 Preliminary Technical Data w PTD, Rev 2.4, October 2012 8 APPLICATIONS INFORMATION RECOMMENDED EXTERNAL COMPONENTS It is recommended to connect a 0.1µF decoupling capacitor between the VDD and GND pins of the WM7230. A ceramic 0.1µF capacitor with X7R dielectric or better is suitable. The capacitor should be placed as close to the WM7230 as possible. OPTIMISED SYSTEM RF DESIGN For optimised RF design please refer to document WAN0278 (Recommended PCB Layout for Microphone RF Immunity in Mobile Cell Phone Applications) for further information. CONNECTION TO A WOLFSON AUDIO CODEC Wolfson provides a range of audio CODECs incorporating a digital microphone input interface; these support direction connection to digital microphones such as the WM7230. Stereo connection of two WM7230 digital microphones to the WM8994 CODEC is illustrated in Figure 2. A 0.1µF decoupling capacitor is recommended; this should be positioned close to the VDD pin of the WM7230. A ceramic 0.1µF capacitor with X7R dielectric or better is suitable. Further information on the WM8994 is provided in the product datasheet, which is available from the Wolfson website. The equivalent connections can be made to other Wolfson devices supporting a digital microphone interface. Figure 2 Stereo WM7230 Digital Microphone Connection to WM8994 |
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