PCF1081AT datasheet(6/19 Pages) ETC2

Part #	PCF1081AT

Description	Fully integrated single chip basestation

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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

TO

MICRO-

PROCESSOR

MODE

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PCF1081AT Datasheet(PDF) 6 Page - List of Unclassifed Manufacturers

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