Analog Devices Inc. EVAL-ADF7021-NDBEZ

Overview

EVAL-ADF7021-NDBEZ from Analog Devices is an evaluation board for the ADF7021-N narrow-band FSK transceiver IC, supporting 80–650 MHz and 842–916 MHz bands with programmable IF filter bandwidths (9/13.5/18.5 kHz), 2FSK/3FSK/4FSK modulation, and −130 dBm receiver sensitivity at 100 bps. It enables rapid prototyping of wireless metering, SRD-compliant remote control, and WMTS systems using a 3-wire serial interface and integrated Tx/Rx switch.

For engineers reviewing the EVAL-ADF7021-NDBEZ datasheet, EVAL-ADF7021-NDBEZ pinout, EVAL-ADF7021-NDBEZ application, or EVAL-ADF7021-NDBEZ equivalent, this board provides validated RF layout, calibrated image rejection, on-board TCXO reference, PA/LNA matching networks, and full register-level control via SPI-compatible interface - critical for FCC Part 15/ETSI EN 300 220 and ARIB STD-T67 compliance validation.

Technical Context

The EVAL-ADF7021-NDBEZ implements the ADF7021-N transceiver in a complete RF front-end configuration, featuring dual-VCO architecture with internal LC tank (842–916 MHz) and external-inductor VCO (80–650 MHz), low-IF (100 kHz) receiver architecture, and integrated Gaussian/raised cosine spectral shaping. It includes calibrated 9 kHz IF filter response and on-board harmonic filtering meeting ETSI/FCC spurious emission limits.

Board-level design incorporates matched 50 Ω PA output (39 + j61 Ω at 915 MHz), LNA input impedance compensation (24 − j60 Ω at 915 MHz), automatic PA ramp control, and AFC loop with programmable pull-in range (0.5–1.5 × IF bandwidth). All digital I/O operates at 2.3–3.6 V with 50 MHz max SCLK support.

Key Specifications

Availability

EVAL-ADF7021-NDBEZ is available at Aetrix Electronics and suitable for wireless metering, SRD-compliant remote security systems, and medical telemetry applications requiring stable component supply, regulatory test readiness, and fast time-to-demonstration.

Supply support for EVAL-ADF7021-NDBEZ 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 semiconductors, headquartered in Norwood, MA.

The EVAL-ADF7021-NDBEZ belongs to Analog Devices' RF transceiver evaluation platform family, designed specifically to accelerate development of narrow-band ISM/SRD wireless systems compliant with FCC, ETSI, and ARIB regulatory standards.

FAQ

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

The EVAL-ADF7021-NDBEZ evaluation board is a fully assembled and tested hardware platform for the ADF7021-N narrow-band FSK transceiver IC. It provides immediate RF performance validation, register-level SPI access, calibrated image rejection, and pre-matched PA/LNA circuits - enabling engineers to verify link budget, modulation fidelity, and regulatory compliance without custom PCB design. The EVAL-ADF7021-NDBEZ includes all necessary passive components, TCXO reference, and debug headers for rapid integration into wireless metering or remote control prototypes.

Does the EVAL-ADF7021-NDBEZ support both 868 MHz and 433 MHz operation out of the box?

Yes, the EVAL-ADF7021-NDBEZ supports both 868 MHz and 433 MHz operation without hardware modification. It leverages the ADF7021-N's dual-VCO architecture: the internal inductor VCO covers 842–916 MHz (including 868 MHz), while the external inductor VCO covers 80–650 MHz (including 433 MHz). Board layout includes dedicated matching networks optimized for both bands, and the EVAL-ADF7021-NDBEZ documentation provides verified component values and layout guidelines for seamless band switching via register configuration.

What reference clock options are available on the EVAL-ADF7021-NDBEZ?

The EVAL-ADF7021-NDBEZ features an on-board 10 MHz TCXO as the default reference clock source, ensuring <1 ppm stability for precise PLL locking and AFC operation across temperature. It also provides pads and routing for external crystal (3.625–24 MHz) or oscillator inputs via OSC1/OSC2 pins, maintaining full compatibility with the ADF7021-N's reference input specifications. All clock paths are impedance-controlled and decoupled per Analog Devices' layout recommendations to minimize phase noise impact on transceiver performance.

How does the EVAL-ADF7021-NDBEZ implement image rejection calibration?

The EVAL-ADF7021-NDBEZ uses the ADF7021-N's on-chip image rejection (IR) calibration routine, which requires no external RF source. During initialization, the IC executes an internal calibration sequence that adjusts mixer quadrature balance and LO path gain to achieve up to 56 dB image rejection - verified on the EVAL-ADF7021-NDBEZ at 868 MHz (calibrated) and 450 MHz (calibrated). The board's RF layout minimizes coupling between RX/TX paths and preserves calibration integrity through controlled impedance traces and ground isolation.

Can the EVAL-ADF7021-NDBEZ be used for FCC Part 15 or ETSI EN 300 220 certification testing?

Yes, the EVAL-ADF7021-NDBEZ is explicitly designed to support pre-compliance and formal certification testing for FCC Part 15, ETSI EN 300 220, and ARIB STD-T67. Its layout includes T-stage harmonic filtering (two inductors + one capacitor), calibrated adjacent channel power (ACP) performance (−46 dBm at 12.5 kHz spacing), and measured spurious emissions below −65 dBc - all documented in the ADF7021-N datasheet using the EVAL-ADF7021-NDBEZ platform. Users must validate final antenna coupling and enclosure effects, but the EVAL-ADF7021-NDBEZ provides the RF foundation required for regulatory submission.