ADF7020 datasheet(3/40 Pages) AD

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Preliminary Technical Data

ADF7020

Rev. PrH | Page 3 of 40

GENERAL DESCRIPTION

The ADF7020 is a low power, highly integrated FSK/GFSK/

ASK/OOK/GASK transceiver designed for operation in the

license-free ISM bands at 433 MHz, 868 MHz, and 915 MHz. It

is suitable for circuit applications that meet either the European

ETSI-300-220 or the North American FCC (Part 15) 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.

The transmit section contains a VCO and low noise

fractional-N PLL with output resolution of <1 ppm. The VCO

operates at twice the fundamental frequency to reduce spurious

emissions and frequency pulling problems.

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.

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

applications. The temperature sensor is accurate to ±5°C over

the full operating temperature range of −40°C to +85°C.

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