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PCF1081AT Datasheet(PDF) 6 Page - List of Unclassifed Manufacturers |
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PCF1081AT Datasheet(HTML) 6 Page - List of Unclassifed Manufacturers |
6 / 19 page printed 1998 Apr 20 6 Philips Semiconductors Product Specification (Rev. 1998 Apr 20) Advanced Basestation IC PCF7991AT 7 MINIMUM APPLICATION CIRCUITRY The following figure shows a minimal application circuitry for the PCF7991AT. The antenna coil La together with the capacitor Ca form a series resonant LC circuit (f = 125 kHz). The antenna tap voltage is attenuated by RV and the input impedance of the RX-pin. The capacitors at XTAL1 and XTAL2 are selected according to the crystal or ceramic resonator specification. In the case of an external clock reference they may be omitted. The capacitors at QGND and CEXT are for device internal biasing and decoupling purposes. Fig.3 Minimum application circuitry VDD 10 µF + 100nF La Ca Rv XTAL1 XTAL2 VDD DIN DOUT SCLK TX1 TX2 RX QGND CEXT VSS 100nF 100nF TO MICRO- PROCESSOR MODE |
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