ADF7020-1 View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

ADF7020-1

High Performance FSK/ASK Transceiver IC

Analog Devices 

GENERAL DESCRIPTION

The ADF7020-1 is a low power, highly integrated FSK/GFSK/

ASK/OOK/GOOK transceiver designed for operation in the

low UHF and VHF bands. The ADF7020-1 uses an external

VCO inductor that allows users to set the operating frequency

anywhere between 135 MHz and 650 MHz. Using the divide-

by-2 circuit allows users to operate the device as low as 80 MHz.

The typical range of the VCO is about 10% of the operating

frequency. A complete transceiver can be built using a small

number of external discrete components, making the ADF7020-

1 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. This

frequency agile PLL allows the ADF7020-1 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

−20 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.

ADF7020-1

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 ADF7020-1 supports a wide variety of programmable

features, including Rx linearity, sensitivity, and IF bandwidth,

allowing the user to trade off receiver sensitivity and selectivity

for current consumption, depending on the application. The

receiver also features a patent-pending automatic frequency

control (AFC) loop, allowing the PLL to compensate for

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 ±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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