Overview
Features and Benefits
- Low power, high performance, narrowband transciever
- Frequency Bands: 80-650MHz and 862-940MHz
- Modulation schemes: 2FSK, 3FSK, 4FSK
- Spectral shaping: Gaussian and Raised Cosine Filtering
- Automatic PA ramp
- Data rates supported: 0.05kps to 25kbps
- Programmable output power: –16dBm to +13dBm
- Low IF architecture with programmable IF bandwidths of 12.5/18.5/25kHz
- 2.3V to 3.6V Power Supply
- Receiver sensitivity: –123dBm @ 1kbps FSK
- Fully automatic frequency control loop (AFC) compensates for lower tolerance crystals
- High Accuracy digital RSSI and integrated Tx/Rx switch
Product Details
The ADF7021 is a low power, highly integrated 2FSK/3FSK/4FSK transceiver. It is designed to operate in the narrowband, license-free ISM bands and licensed bands in the 80 MHz to 650 MHz and 862 MHz to 940 MHz frequency ranges. It has both Gaussian and raised cosine data filtering options to improve spectral efficiency for narrowband 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 transmit section contains a voltage controlled oscillator (VCO) and a low noise fractional-N PLL with output resolution of <1 ppm. This frequency-agile PLL allows the ADF7021 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 −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), minimizing power consumption and the external component count while avoiding interference problems 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 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 with programmable pull-in range, 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, and 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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Product Lifecycle
Not Recommended for New Designs
This designates products ADI does not recommend broadly for new designs.
Evaluation Kits (1)
Documentation & Resources
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AN-1389: Recommended Rework Procedure for the Lead Frame Chip Scale Package (LFCSP) (Rev. 0)1/25/2016PDF133K
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AN-1285: ADF7021-N Radio Performance for Wireless Meter-Bus (WM-Bus), Mode N (Rev. 0)2/11/2014PDF188 kB
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AN-1258: Image Rejection Calibration on the ADF7021, ADF7021-N, and ADF7021-V (Rev. 0)11/22/2013PDF398 kB
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AN-1182: Understanding and Optimizing the AFC Loop on the ADF7021 for Minimum Preamble (Rev. 0)3/29/2013PDF224 kB
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AN-859: RF Port Impedance Data, Matching, and External Component Selection for the ADF7020-1, ADF7021, and ADF7021-N (Rev. A)2/23/2010PDF333 kB
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AN-0987: Designing a Wireless Transceiver System to Meet the Wireless M-Bus Standard (Rev. 0)2/23/2010PDF140 kB
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AN-915: CDR Operation for ADF7020, ADF7020-1, ADF7021, and ADF7025 (Rev. 0)7/31/2007PDF439 kB
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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)7/13/2006PDF259 kB
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AN-772: A Design and Manufacturing Guide for the Lead Frame Chip Scale Package (LFCSP)2/1/2006
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AN-771: ADSP-BF533 EZ-KIT Lite and ADF70xx Interface (Rev. 0)5/9/2005PDF201 K
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ADuCM3027/ADuCM3029 Ultra Low Power Microcontrollers11/10/2016PDF426 K
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Connectivity Solutions for the Internet of Things10/26/2016PDF1 M
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The Next Generation of Line Sensors: Power Harvested, Connected, and Lower Maintenance10/1/2016 Thought Leadership
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Wireless Technologies for Smart Meters8/1/2011
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RF Meets Power Lines: Designing Intelligent Smart Grid Systems that Promote Energy Efficiency3/5/2010
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Smart Metering Technology Promotes Energy Efficiency for a Greener World7/27/2009
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Wireless Short Range Devices and Narrowband Communications7/1/2007
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Understand Wireless Short-Range Devices for Global License-Free Systems3/7/2007
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The Use of Short Range Wireless in a Multi-Metering System12/1/2006PDF220 kB
Software & Systems Requirements
Evaluation Software
Tools & Simulations
Design Tools
ADIsimSRD Design Studio
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.
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.
| Part Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| ADF7021BCPZ | Material Declaration | Reliability Data | 48-Lead LFCSP (7mm x 7mm w/ EP) | |
| ADF7021BCPZ-RL | Material Declaration | Reliability Data | 48-Lead LFCSP (7mm x 7mm w/ EP) | |
| ADF7021BCPZ-RL7 | Material Declaration | Reliability Data | 48-Lead LFCSP (7mm x 7mm w/ EP) | |
| Wafer Fabrication Data |
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Sample & Buy
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.