ADF7020
Data Sheet
GENERAL DESCRIPTION
The ADF7020 is a low power, highly integrated FSK/ASK/OOK
transceiver designed for operation in the license-free ISM bands
at 433 MHz, 868 MHz, and 915 MHz, as well as the proposed
Japanese RFID band at 950 MHz. A Gaussian data filter option
is available to allow either GFSK or G-ASK modulation, which
provides a more spectrally efficient modulation. In addition to
these modulation options, the ADF7020 can also be used to
perform both MSK and GMSK modulation, where MSK is a
special case of FSK with a modulation index of 0.5. The modula-
tion index is calculated as twice the deviation divided by the
data rate. MSK is spectrally equivalent to O-QPSK modulation
with half-sinusoidal Tx baseband shaping, so the ADF7020 can
also support this modulation option by setting up the device in
MSK mode.
The transmitter output power is programmable in 0.3 dB steps
from −16 dBm to +13 dBm. 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 (200 kHz),
minimizing power consumption and the external component
count and avoiding interference problems at low frequencies.
The ADF7020 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, allowing the PLL to track out the frequency
error in the incoming signal.
This device is suitable for circuit applications that meet the
European ETSI-300-220, the North American FCC (Part 15),
or the Chinese Short Range Device regulatory standards. A
complete transceiver can be built using a small number of
external discrete components, making the ADF7020 very
suitable for price-sensitive and area-sensitive applications.
An on-chip ADC provides readback of an integrated tempera-
ture sensor, an external analog input, the battery voltage, or the
RSSI signal, which provides savings on an ADC in some appli-
cations. 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.
The transmitter block on the ADF7020 contains a VCO and
low noise fractional-N PLL with an output resolution of
<1 ppm. This frequency agile PLL allows the ADF7020 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.
Rev. D | Page 4 of 48
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