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PCF7991AT Datasheet(PDF) 6 Page - List of Unclassifed Manufacturers

No. de pieza PCF7991AT
Descripción Electrónicos  Fully integrated single chip basestation
PDF  19 Pages
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Fabricante Electrónico  ETC2 [List of Unclassifed Manufacturers]
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PCF7991AT Datasheet(HTML) 6 Page - List of Unclassifed Manufacturers

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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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