PCF7991AT 데이터 시트보기 (PDF) - Philips Electronics

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PCF7991AT

Advanced Basestation IC

Philips Electronics 

Philips Semiconductors

Advanced Basestation IC

Product Specification (Rev. 1998 Apr 20)

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.

VDD

+

10 µF

100nF

La

Ca

Rv

TX1

VDD

XTAL1

TX2

XTAL2

DIN

RX

DOUT

SCLK

QGND

CEXT

VSS MODE

100nF

100nF

TO

MICRO-

PROCESSOR

Fig.3 Minimum application circuitry

printed 1998 Apr 20

6

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