Analog Devices Inc. EVAL-ADF7021-NDB9Z

Overview

EVAL-ADF7021-NDB9Z from Analog Devices is an evaluation board for the ADF7021-N narrow-band FSK transceiver IC, supporting 842–916 MHz and 80–650 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 telemetry systems.

For engineers reviewing the EVAL-ADF7021-NDB9Z datasheet, EVAL-ADF7021-NDB9Z pinout, EVAL-ADF7021-NDB9Z application, or EVAL-ADF7021-NDB9Z equivalent, this board provides validated RF layout, calibrated image rejection, integrated Tx/Rx switch, on-board crystal reference, and full register-level access via 3-wire serial interface to accelerate development of FCC Part 15/ETSI EN 300 220/ARIB STD-T67 compliant systems.

Technical Context

The EVAL-ADF7021-NDB9Z implements the ADF7021-N transceiver in a dual-VCO architecture: one internal LC VCO for 842–916 MHz operation and one external-inductor VCO for 80–650 MHz coverage. It uses a low-IF receiver (100 kHz) with programmable Gaussian/raised cosine filtering and supports automatic frequency control (AFC), digital RSSI, and on-chip 7-bit ADC for temperature/battery monitoring.

Board-level design includes matched 50 Ω RF front-end networks for LNA and PA, T-stage harmonic filtering per conducted emission requirements, and precise calibration circuitry for image rejection (56 dB), IF filter bandwidth, and VCO tuning-enabling direct validation of regulatory spectral mask compliance for ARIB, ETSI, and FCC SRD standards.

Key Specifications

Availability

EVAL-ADF7021-NDB9Z is available at Aetrix Electronics and suitable for wireless metering, medical telemetry, and building automation applications requiring stable component supply, pre-validated RF performance, and regulatory-ready reference design support.

Supply support for EVAL-ADF7021-NDB9Z 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 ADF7021-N product line delivers highly integrated, low-power narrow-band transceivers optimized for license-free and licensed SRD applications across industrial, medical, and consumer wireless systems.

FAQ

What is the primary function of the EVAL-ADF7021-NDB9Z evaluation board?

The EVAL-ADF7021-NDB9Z evaluation board is a fully assembled and tested platform for the ADF7021-N narrow-band FSK transceiver IC. It provides immediate hardware validation of RF performance, register programming, and system integration for applications such as wireless metering and remote security. The board includes all necessary matching networks, filters, and clock sources to operate the ADF7021-N without additional RF design effort. Engineers use EVAL-ADF7021-NDB9Z to verify link budget, AFC behavior, and regulatory spectral compliance before custom PCB spin.

Does EVAL-ADF7021-NDB9Z support both 868 MHz and 433 MHz operation out of the box?

Yes, EVAL-ADF7021-NDB9Z supports both 868 MHz and 433 MHz operation using the same board layout. 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 supports 80–650 MHz (including 433 MHz). Board jumpers and matching components are configured for optimal performance in both bands, and the datasheet confirms validated performance at 433 MHz and 868 MHz with −122 dBm and −130 dBm sensitivity respectively.

How does EVAL-ADF7021-NDB9Z assist with regulatory certification for ETSI EN 300 220 or FCC Part 15?

EVAL-ADF7021-NDB9Z incorporates design features critical for regulatory compliance: T-stage harmonic filtering, calibrated image rejection (56 dB), programmable IF filter bandwidths aligned to 12.5/25 kHz channel spacing, and automatic PA ramp control to suppress spectral splatter. Its measured adjacent channel power (ACP) meets ETSI EN 300 220 limits (−46 dBm at ±12.5 kHz offset) and FCC Part 15 spectral masks. Engineers use EVAL-ADF7021-NDB9Z test data as baseline evidence during formal certification testing.

Can EVAL-ADF7021-NDB9Z be used to evaluate 3FSK and 4FSK modulation modes?

Yes, EVAL-ADF7021-NDB9Z fully supports 3FSK and 4FSK modulation as implemented by the ADF7021-N. The board's firmware and register configuration allow dynamic switching between 2FSK, 3FSK, and 4FSK to optimize range and throughput. Measured receiver sensitivity for 3FSK is −110 dBm at 9.6 kbps (Viterbi enabled), and for 4FSK it is −112 dBm under identical conditions. All modulation schemes use the same on-board Gaussian or raised cosine filtering options.

What external components are required to operate EVAL-ADF7021-NDB9Z?

EVAL-ADF7021-NDB9Z requires only a 3.3 V DC power supply, a microcontroller or PC-based host for serial communication (via USB-to-serial adapter), and an antenna connected to the SMA RF connector. No additional RF components, crystals, or filters are needed-the board includes a 10 MHz crystal oscillator, matched LNA/PA networks, harmonic filter, and all decoupling. The 3-wire serial interface (SCLK, SDATA, SLE) provides full register access to configure the ADF7021-N on EVAL-ADF7021-NDB9Z.