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ADF7021BCPZ Folha de dados(PDF) 3 Page - Analog Devices

Nome de Peças ADF7021BCPZ
Descrição Electrónicos  High Performance Narrowband ISM Transceiver IC
Download  44 Pages
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Fabricante Electrônico  AD [Analog Devices]
Página de início  http://www.analog.com
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Preliminary Technical Data
ADF7021
Rev. PrI | Page 3 of 44
GENERAL DESCRIPTION
The ADF7021 is a low power, highly integrated 2FSK/3FSK/4FSK
transceiver. It is designed to operate in the narrow-band,
license-free ISM bands and licensed bands in the 80 MHz to
650 MHz and 862 MHz to 940 MHz frequency ranges. It has
both Gaussian and raised cosine data filtering options to
improve spectral efficiency for narrow-band applications.
It is suitable for circuit applications targeted at European
ETSI-EN 300-220, the Japanese ARIB STD-T67, the Chinese
Short Range Device regulations, and the North American FCC
Part 15, Part 90, and Part 95 regulatory standards. A complete
transceiver can be built using a small number of external
discrete components, making the ADF7021 very suitable for
price-sensitive and area-sensitive applications.
The transmit section contains a voltage controlled oscillator
(VCO) and a low noise fractional-N PLL with output resolution
of <1 ppm. This frequency-agile PLL allows the ADF7021 to be
used in frequency hopping spread spectrum (FHSS) systems.
The VCO operates at twice the fundamental frequency to
reduce spurious emissions and frequency pulling problems.
The transmitter output power is programmable in 63 steps from
−16 dBm to +13 dBm and has an automatic power ramp control
to prevent spectral splatter and help meet regulatory standards.
The transceiver RF frequency, channel spacing, and modulation
are programmable using a simple 3-wire interface. The device
operates with a power supply range of 2.3 V to 3.6 V and can be
powered down when not in use.
A low IF architecture is used in the receiver (100 kHz),
minimizing power consumption and the external component
count while avoiding interference problems at low frequencies.
The IF filter has programmable bandwidths of 12.5 kHz,
18.75 kHz, and 25 kHz. The ADF7021 supports a wide variety
of programmable features including Rx linearity, sensitivity, and
IF bandwidth, allowing the user to trade off receiver sensitivity
and selectivity against current consumption, depending on the
application. The receiver also features a patent-pending
automatic frequency control (AFC) loop with programmable
pull-in range, allowing the PLL to track out the frequency error
in the incoming signal.
An on-chip ADC provides readback of an integrated tempera-
ture sensor, an external analog input, the battery voltage, and
the RSSI signal, which provides savings on an ADC in some
applications. The temperature sensor is accurate to ±10°C over
the full operating temperature range of −40°C to +85°C. This
accuracy can be improved by doing a 1-point calibration at
room temperature and storing the result in memory.


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