Analog Devices Inc. EVAL-ADF7021-NDBIZ

Overview

EVAL-ADF7021-NDBIZ is an evaluation board from Analog Devices designed to accelerate development of narrow-band wireless systems using the ADF7021-N transceiver IC. It supports 80–650 MHz and 842–916 MHz frequency bands, offers programmable IF filter bandwidths (9/13.5/18.5 kHz), 2FSK/3FSK/4FSK modulation, and −130 dBm receiver sensitivity at 100 bps - enabling rapid prototyping for FCC Part 15/90/95, ETSI EN 300 220, and ARIB STD-T67 compliant SRD applications.

For engineers reviewing the EVAL-ADF7021-NDBIZ datasheet, EVAL-ADF7021-NDBIZ pinout, EVAL-ADF7021-NDBIZ application, or EVAL-ADF7021-NDBIZ equivalent, this board provides full access to the ADF7021-N's 3-wire serial interface, on-board TCXO reference, RF matching networks, PA/LNA biasing, and analog sensor readback - supporting fast validation of modulation schemes, AFC loop behavior, image rejection calibration, and low-power sleep mode operation.

Technical Context

The EVAL-ADF7021-NDBIZ implements a complete RF front-end for the ADF7021-N transceiver, including matched 50 Ω RF input/output paths, dual-VCO support circuitry (external inductor for 80–650 MHz, internal LC tank for 842–916 MHz), and calibrated IF filter components. It integrates a 10 MHz TCXO with <1 ppm stability and supports both Gaussian and raised cosine spectral shaping via register-controlled filtering.

Board-level features include on-board LNA/PA impedance matching networks optimized for 868 MHz (48 + j54 Ω) and 915 MHz (39 + j61 Ω), integrated temperature sensor and battery voltage monitoring via the ADF7021-N's 7-bit ADC, and hardware-accelerated automatic frequency control (AFC) with programmable pull-in range up to ±1.5 × IF bandwidth.

Key Specifications

Availability

EVAL-ADF7021-NDBIZ is available at Aetrix Electronics and suitable for wireless metering, remote security systems, and industrial process control requiring stable component supply, traceable sourcing, and long-term evaluation platform availability.

Supply support for EVAL-ADF7021-NDBIZ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, headquartered in Wilmington, MA, with R&D centers worldwide.

The EVAL-ADF7021-NDBIZ belongs to Analog Devices' RF transceiver evaluation platform family, engineered specifically to de-risk narrow-band SRD system development for regulatory-compliant, low-power, license-free and licensed-band wireless applications.

FAQ

What is the primary function of the EVAL-ADF7021-NDBIZ evaluation board?

The EVAL-ADF7021-NDBIZ evaluation board is a fully assembled and tested hardware platform for the ADF7021-N narrow-band transceiver IC. It provides immediate RF connectivity, calibrated IF filtering, matched PA/LNA circuits, and a stable 10 MHz TCXO reference - enabling engineers to validate radio performance, register configuration sequences, and protocol stack integration without custom PCB design. The EVAL-ADF7021-NDBIZ does not contain its own transceiver; it hosts and interfaces exclusively with the ADF7021-N IC.

Does the EVAL-ADF7021-NDBIZ support both 868 MHz and 915 MHz ISM bands simultaneously?

Yes - the EVAL-ADF7021-NDBIZ supports both bands via the ADF7021-N's dual-VCO architecture. The internal inductor VCO covers 842–916 MHz (including 868 MHz and 915 MHz), while the external inductor VCO handles 80–650 MHz. Board layout includes dedicated matching networks optimized for 868 MHz (48 + j54 Ω) and 915 MHz (39 + j61 Ω), and the EVAL-ADF7021-NDBIZ documentation confirms operation across both bands using the same board revision.

Can the EVAL-ADF7021-NDBIZ be used to verify ADF7021-N receiver sensitivity claims like −130 dBm at 100 bps?

Yes - the EVAL-ADF7021-NDBIZ is the reference platform used in the ADF7021-N datasheet (Rev. B, Page 7, Table 3) to measure receiver sensitivity. Its calibrated RF path, low-noise LNA matching, and precise IF filter implementation allow direct validation of published sensitivity values under real-world conditions, including high-sensitivity mode, 13.5 kHz IF bandwidth, and 1 kHz frequency deviation. All sensitivity test data in the ADF7021-N datasheet was captured using EVAL-ADF7021-NDBxx boards.

What reference clock source does the EVAL-ADF7021-NDBIZ use, and is it configurable?

The EVAL-ADF7021-NDBIZ uses a fixed 10 MHz TCXO (temperature-compensated crystal oscillator) with ±0.5 ppm stability over −40°C to +85°C. This reference is hardwired to the ADF7021-N's OSC1/OSC2 pins and cannot be replaced with an external clock source without hardware modification. The TCXO meets the ADF7021-N's reference input specification (3.625–24 MHz) and enables fast crystal start-up (<1.2 ms), critical for low-latency wake-up in battery-powered SRD applications.

Does the EVAL-ADF7021-NDBIZ include provisions for analog sensor interfacing via the ADF7021-N's on-chip ADC?

Yes - the EVAL-ADF7021-NDBIZ exposes the ADF7021-N's analog inputs (ADCIN, TEMP_SENSE, BATT_IN) to test points and includes onboard conditioning circuitry. It supports readback of temperature (±10°C accuracy), battery voltage, and RSSI via the ADF7021-N's 7-bit ADC, as documented in the ADF7021-N datasheet Sections "ADC PARAMETERS" and "Battery Voltage/ADCIN/Temperature Sensor Readback". No additional external ADC is required to access these functions on the EVAL-ADF7021-NDBIZ.