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ADF7021BCPZ-RL7 Datenblatt(PDF) 4 Page - Analog Devices

Teilenummer ADF7021BCPZ-RL7
Bauteilbeschribung  High Performance Narrow-Band Transceiver IC
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ADF7021BCPZ-RL7 Datenblatt(HTML) 4 Page - Analog Devices

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ADF7021
Data Sheet
Rev. B | Page 4 of 64
GENERAL DESCRIPTION
The ADF7021 is a high performance, low power, highly integrated
2FSK/3FSK/4FSK transceiver. It is designed to operate in the
narrow-band, license-free ISM bands, and in the licensed bands
with frequency ranges of 80 MHz to 650 MHz and 862 MHz to
950 MHz. The part has both Gaussian and raised cosine transmit
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 range of on-chip FSK modulation and data filtering options
allows users greater flexibility in their choice of modulation
schemes while meeting tight spectral efficiency requirements.
The ADF7021 also supports protocols that dynamically switch
between 2FSK/3FSK/4FSK to maximize communication range
and data throughput.
The transmit section contains dual voltage controlled oscillators
(VCOs) and a low noise fractional-N PLL with an output resolution
of <1 ppm. The ADF7021 has a VCO using an internal LC tank
(431 MHz to 475 MHz, 862 MHz to 950 MHz) and a VCO using
an external inductor as part of its tank circuit (80 MHz to
650 MHz). The dual VCO design allows dual-band operation
where the user can transmit and/or receive at any frequency
supported by the internal inductor VCO and can also transmit
and/or receive at a particular frequency band supported by the
external inductor VCO.
The frequency agile PLL allows the ADF7021 to be used in
frequency hopping spread spectrum (FHSS) systems.
Both VCOs operate 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), which
minimizes power consumption and the external component
count, yet avoids dc offset and flicker noise 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 program-
mable 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 that allows
the PLL to track out the frequency error in the incoming signal.
The receiver achieves an image rejection performance of 56 dB
using a patent-pending IR calibration scheme that does not
require the use of an external RF source.
An on-chip ADC provides readback of the integrated tempera-
ture sensor, external analog input, battery voltage, and 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 performing a 1-point calibration at room
temperature and storing the result in memory.


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