Analog Devices Inc. EVAL-ADF7021-NDBZ5

Overview

EVAL-ADF7021-NDBZ5 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 SRD-compliant wireless metering and industrial telemetry systems.

For engineers reviewing the EVAL-ADF7021-NDBZ5 datasheet, EVAL-ADF7021-NDBZ5 pinout, EVAL-ADF7021-NDBZ5 application, or EVAL-ADF7021-NDBZ5 equivalent, this board provides verified RF layout, calibrated image rejection, integrated T-stage harmonic filtering, and full register-level control via 3-wire serial interface - critical for FCC Part 15/ETSI EN 300 220 compliance validation and low-power SRD system development.

Technical Context

The EVAL-ADF7021-NDBZ5 implements the ADF7021-N transceiver in a production-ready reference configuration: dual-VCO architecture supports simultaneous 842–916 MHz (internal inductor) and 80–650 MHz (external inductor) operation, with fractional-N PLL achieving <1 ppm resolution and 40 µs settling for frequency-hopping systems. Its low-IF (100 kHz) receiver uses on-chip image rejection calibration to deliver 56 dB IR without external RF sources.

Board-level design integrates matched LNA/PA impedance networks (e.g., 39 + j61 Ω at 915 MHz), Gaussian/raised cosine spectral shaping, automatic PA ramp control, and 7-bit ADC readback for temperature, battery voltage, and RSSI - enabling direct sensor-to-antenna signal chain validation without external components.

Key Specifications

Availability

EVAL-ADF7021-NDBZ5 is available at Aetrix Electronics and suitable for wireless metering, industrial telemetry, and home automation applications requiring stable component supply, pre-validated RF performance, and regulatory test support.

Supply support for EVAL-ADF7021-NDBZ5 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, communications, automotive, and healthcare markets since 1965.

The EVAL-ADF7021-NDBZ5 belongs to Analog Devices' RF transceiver evaluation platform family, designed specifically to accelerate development of narrow-band, license-free ISM band systems compliant with FCC Part 15, ETSI EN 300 220, and ARIB STD-T67 standards.

FAQ

What is the primary function of the EVAL-ADF7021-NDBZ5 evaluation board?

The EVAL-ADF7021-NDBZ5 evaluation board is a fully assembled and tested hardware platform for the ADF7021-N narrow-band FSK transceiver IC. It provides immediate access to all device registers via a 3-wire serial interface, includes calibrated RF front-end matching networks, integrated harmonic filtering, and supports rapid validation of modulation schemes, sensitivity, and regulatory emissions - eliminating the need for custom PCB development during early-stage SRD system design.

Which frequency bands does the EVAL-ADF7021-NDBZ5 support out of the box?

The EVAL-ADF7021-NDBZ5 supports both major operating ranges of the ADF7021-N: 80–650 MHz using the external inductor VCO and 842–916 MHz using the internal inductor VCO. The board's layout and component selection are optimized for 868 MHz (ETSI EN 300 220) and 915 MHz (FCC Part 15) operation, with documented matching network values for 433 MHz, 450 MHz, and 315 MHz bands included in the ADF7021-N datasheet.

Does the EVAL-ADF7021-NDBZ5 include image rejection calibration capability?

Yes, the EVAL-ADF7021-NDBZ5 enables full use of the ADF7021-N's on-chip image rejection (IR) calibration feature. The board's RF layout preserves signal integrity required for the internal calibration routine, which achieves up to 56 dB image rejection without external RF sources - as verified in datasheet Figure 41 and Table 3. This eliminates manual tuning and ensures consistent performance across temperature and voltage variations.

How is transmit spectral purity validated on the EVAL-ADF7021-NDBZ5?

Transmit spectral purity on the EVAL-ADF7021-NDBZ5 is validated using its integrated T-stage harmonic filter (two inductors and one capacitor), which achieves −52 dBc third harmonic suppression and −65 dBc reference spurs per datasheet Table 2. Adjacent channel power (ACP) measurements - e.g., −46 dBm at ±12.5 kHz offset for 868 MHz - are performed directly on the board using PN9 data sequences, confirming compliance with ETSI EN 300 220 spectral mask requirements.

Can the EVAL-ADF7021-NDBZ5 be used for battery-powered applications?

Yes, the EVAL-ADF7021-NDBZ5 supports battery-powered operation through the ADF7021-N's 2.3–3.6 V supply range and ultra-low 0.1 µA power-down current. Its design includes low-quiescent LDO regulation and verified current consumption profiles: 24.6 mA in high-sensitivity receive mode at 868 MHz and 32.3 mA at +10 dBm transmit output - enabling accurate runtime estimation for coin-cell or Li-ion powered SRD endpoints such as smart meters and wireless sensors.