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PCF7991AT Datasheet(Hoja de datos) 1 Page - NXP Semiconductors

No. de Pieza. PCF7991AT
Descripción  Advanced Basestation IC, ABIC
Descarga  1 Pages
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Fabricante  PHILIPS [NXP Semiconductors]
Página de inicio  http://www.nxp.com
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Philips Semiconductors
Product Profile
PCF7991AT
May 1998
Advanced Basestation IC, ABIC
Features
• Extended system operating range due to powerful
AM/PM demodulation technique
• Ideally suited for "Intelligent Antenna" and "Active
Antenna" architectures
• High antenna drive capabilities, CW: 200mAp
• Low antenna driver output resistance, 3.5 Ω
• Excellent receiver sensitivity, 2mVpp
• Large receiver dynamic range
• Programmable clock divider, modulator, receiver
gain and filter characteristics
• Fast "read after write" receiver settling
characteristics
• On-chip receive EMI filter
• Antenna failure mode detection
• Few external components
• Operating supply voltage: 4.5 to 5.5 V
• Power down mode: 7µA @ 5.5 V
• 14-pin SO package
General Description
The PCF7991 is a highly integrated and powerful
advanced basestation IC, ABIC, ideally suited for
vehicle immobilisation applications. The device
incorporates all necessary functions to facilitate reading
and writing of transponders.
The ABIC, PCF7991 employs a unique AM/PM
demodulation technique that extends the system
operating range compared with simple envelope
detection.
Optimised to operate with the Philips transponder family
(PCF79xx), the ABIC can be used in combination with
commonly available transponder that employ ASK
modulation. ASK modulation and receive characteristics
are widely programmable for powerful system
adaptation. The ABIC fits "Intelligent Antenna" as well
as "Active Antenna" applications.
The carrier frequency can be derived from an on-chip
oscillator or an external clock source. A wide range of
clock frequencies can be applied due to the
programmable on-chip clock divider circuitry.
The device enables system diagnostic functions by
antenna fail detection features.
Communication with the device and the transponder is
provided via the serial microcontroller interface.
Employing CMOS technology, the device features low
power operation and supports Idle and Powerdown
modes.
Minimum Application Circuitry
Modulation
Pulse Gen.
Antenna
Driver
Synchron
Demodulator
SC Filter
Amplifier
Control
Unit
Clk Divider
Timing
Oscillator
Serial
Interface
Register
DIN
CLK
DOUT
XTAL2
XTAL1
RX
TX1
TX2
VDD
VSS
QGND
CEXT
EMI
Filter
PCF 7991
4.5 ... 5.5 V
To microcontroller




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