Features and Benefits
- Low power, low IF transceiver
- Frequency bands
431 MHz to 478 MHz
862 MHz to 956 MHz
- Data rates supported
0.15 kbps to 200 kbps, FSK
0.15 kbps to 64 kbps, ASK
- See datasheet for additional features
The ADF7020 is a low power, low-IF transceiver designed for operation in the license-free ISM bands at 433MHz, 868MHz and 915MHz. It is suitable for circuit applications that meet either the European ETSI EN-300-220 or the North American FCC, Part 15.247 and 15.249 regulatory standards. It operates from a 2.3 V to 3.6V power supply with programmable output power from -16 to +13dBm in 0.3dBm steps. Its receiver sensitivity is -117.5dBm at 1kbits/s in FSK mode or -110.5dBm at 9.6kbits/s. Power consumption is 20mA in receive mode and 30mA in transmit mode (+10dBm output).
Other features include on-chip VCO (voltage controlled oscillator), Fractional-N PLL, on-chip 7-bit ADC (analog-to-digital converter), digital received signal strength indication (RSSI), temperature sensor and a patent pending fully automatic AFC loop. This allows the ADF7020 to be used with lower tolerance crystals. Its leakage current is < 1uA in power down mode.
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. 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.
The transmitter output power is programmable in 0.3 dB steps from −16 dBm to +13 dBm. The transceiver RF frequency 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 temperature 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.
- Low cost wireless data transfer
- Remote control/security systems
- Wireless metering
- Keyless entry
- Home automation
- Process and building control
- Wireless voice
Markets and Technologies
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
The ADF7020 evaluation board software controls the operation of the ADF7020 evaluation boards from a PC over a USB . Install the ADF7020 evaluation software by clicking on "ADF7xxx_ADIismLINK Install_*.exe" at the link provided. The software will be available under Programs → Analog Devices → ADF7xxx . The Analog Devices example network protocol software, ADIismLINK Rev2.0, is also installed as part of this setup file: Programs → Analog Devices → ADIismLINK V2 Host Application.
ADF7020 schematic and BOM are included in the Evaluation Board User Guide.
Documentation & Resources
AN-1389: Recommended Rework Procedure for the Lead Frame Chip Scale Package (LFCSP) (Rev. 0)1/25/2016
AN-0987: Designing a Wireless Transceiver System to Meet the Wireless M-Bus Standard (Rev. 0)2/23/2010
AN-915: CDR Operation for ADF7020, ADF7020-1, ADF7021, and ADF7025 (Rev. 0)7/31/2007
AN-917: Using an LC Harmonic Filter at 868 MHz and 915 MHz with the EVAL-ADF7020 and EVAL-ADF7025 Evaluation Boards (Rev. 0)6/6/2007
AN-852: Using the Test DAC on the ADF702x to Implement Functions Such as Analog FM DEMOD, SNR Measurement, FEC Decoding, and PSK/4FSK Demodulation (Rev. 0)7/13/2006
AN-772: A Design and Manufacturing Guide for the Lead Frame Chip Scale Package (LFCSP)2/1/2006
AN-771: ADSP-BF533 EZ-KIT Lite and ADF70xx Interface (Rev. 0)5/9/2005
AN-764: ADF7020 RF Port Impedance Values for Matching Purposes (Rev. 0)2/10/2005
Wireless Technologies for Smart Meters8/1/2011
RF Meets Power Lines: Designing Intelligent Smart Grid Systems that Promote Energy Efficiency3/5/2010
Smart Metering Technology Promotes Energy Efficiency for a Greener World7/27/2009
Smart Metering Technology Promotes Energy Efficiency for a Greener World1/1/2009 Analog Dialogue
Wireless Short Range Devices and Narrowband Communications7/1/2007
Understand Wireless Short-Range Devices for Global License-Free Systems3/7/2007
The Use of Short Range Wireless in a Multi-Metering System12/1/2006
Wireless Short-Range Devices: Designing a Global License-Free System for Frequencies <1 GHz3/1/2006 Analog Dialogue
A Smart Modem for Robust Wireless Data Transmission Over ISM Bands (433 MHz, 868 MHz, and 902 MHz)3/1/2005 Analog Dialogue
Software & Systems Requirements
Tools & Simulations
Analog Devices ADIsimSRD Design Studio is a very powerful tool allowing real-time simulation and optimization of many of the parameters in a typical wireless system using the ADF7xxx family of transceivers and transmitters.
Reference Designs (1)
CN0164Low Power, Long Range, ISM Wireless Measuring Node
CN0164Low Power, Long Range, ISM Wireless Measuring Node
Features & Benefits
- Remote sensing and automation applications
- Range up to 1 km in free space
- Low current consumption for increased battery life
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