Analog Devices Inc. EVAL-ADF7021-VDB3Z

Overview

EVAL-ADF7021-VDB3Z from Analog Devices is an evaluation board for the ADF7021-V high-performance narrow-band transceiver IC, supporting 80–960 MHz operation with external VCO, 2/3/4FSK modulation, programmable IF filter bandwidths (9/13.5/18.5 kHz), and −125 dBm receiver sensitivity at 250 bps. It enables rapid prototyping of ETSI EN 300 220 and FCC Part 90/95 compliant wireless telemetry systems.

For engineers reviewing the EVAL-ADF7021-VDB3Z datasheet, EVAL-ADF7021-VDB3Z pinout, EVAL-ADF7021-VDB3Z application, or EVAL-ADF7021-VDB3Z equivalent, this board provides validated RF layout, calibrated image rejection, integrated harmonic filtering, and full register-level control via 3-wire serial interface - critical for narrow-band SRD design validation, regulatory pre-compliance testing, and transceiver firmware development.

Technical Context

The EVAL-ADF7021-VDB3Z implements a complete reference design for the ADF7021-V transceiver, featuring a low-IF architecture (100 kHz), on-chip fractional-N PLL with external VCO support up to 1920 MHz, and patented image rejection calibration. It integrates a T-stage harmonic filter, optimized LNA/PA matching networks for 868/915/433 MHz bands, and supports Gaussian/raised cosine spectral shaping.

Board-level features include 3-wire SPI interface (SCLK/SDATA/SLE), Tx/Rx mode switching via CE and TxRxCLK, on-board TCXO or crystal reference (2–24 MHz), and analog monitoring points for RSSI, temperature sensor, battery voltage, and ADCIN. All digital I/Os are 3.3 V tolerant and conform to ADF7021-V timing specifications including <25 ns SCLK-to-SREAD setup/hold.

Key Specifications

Availability

EVAL-ADF7021-VDB3Z is available at Aetrix Electronics and suitable for wireless metering, narrow-band telemetry, and ETSI/FCC-regulated SRD development requiring stable component supply, pre-validated RF performance, and production-ready reference design fidelity.

Supply support for EVAL-ADF7021-VDB3Z 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, with deep expertise in RF, precision measurement, and power management technologies.

The EVAL-ADF7021-VDB3Z belongs to Analog Devices' RF transceiver evaluation platform family, designed specifically to accelerate development of license-free and licensed narrow-band wireless systems compliant with ETSI EN 300 220, FCC Part 90/95, and ARIB STD-T67.

FAQ

What is the primary function of the EVAL-ADF7021-VDB3Z?

The EVAL-ADF7021-VDB3Z is an evaluation board for the ADF7021-V narrow-band transceiver IC. It provides a fully assembled, tested, and calibrated hardware platform to validate RF performance, develop firmware, and verify compliance with ETSI EN 300 220 and FCC Part 90/95. The board includes all necessary matching networks, filtering, clock sources, and interface signals required to operate the EVAL-ADF7021-VDB3Z out-of-the-box with minimal external components.

Does the EVAL-ADF7021-VDB3Z support external VCO operation?

Yes, the EVAL-ADF7021-VDB3Z is configured to support external VCO operation as required by the ADF7021-V IC. It includes dedicated L2 input and VCO tuning voltage routing, compatible with VCOs operating up to 1920 MHz (e.g., 920 MHz or 1738 MHz fundamental). The board's layout and decoupling follow Analog Devices' recommendations for phase noise optimization and spurious suppression in EVAL-ADF7021-VDB3Z applications.

What modulation schemes and data rates does the EVAL-ADF7021-VDB3Z enable?

The EVAL-ADF7021-VDB3Z enables full use of the ADF7021-V's modulation capabilities: 2FSK, 3FSK, and 4FSK with Gaussian or raised cosine filtering. It supports data rates from 0.05 kbps to 24 kbps - verified across IF bandwidths (9/13.5/18.5 kHz) and deviation settings. Performance metrics such as −125 dBm sensitivity at 250 bps and −47 dBm adjacent channel power (868 MHz, 12.5 kHz spacing) were measured directly on the EVAL-ADF7021-VDB3Z using PN9 sequences.

How is image rejection calibrated on the EVAL-ADF7021-VDB3Z?

The EVAL-ADF7021-VDB3Z leverages the ADF7021-V's patent-pending on-chip image rejection (IR) calibration, which achieves up to 50 dB rejection at 868 MHz without requiring external RF sources or manual tuning. Calibration is initiated via register write and completed in under 1 ms. The EVAL-ADF7021-VDB3Z board preserves signal integrity and grounding integrity needed to realize this specification, as confirmed in Analog Devices' characterization using the EVAL-ADF7021-VDB3Z platform.

Can the EVAL-ADF7021-VDB3Z be used for FCC Part 90 Emission Mask D compliance testing?

Yes - the EVAL-ADF7021-VDB3Z includes a T-stage harmonic filter and optimized PA/LNA matching that meets FCC Part 90 Emission Mask D requirements. Measured spurious emissions are −77 dBc at 12.5 kHz offset (460 MHz), and occupied bandwidth is 4.0 kHz (2FSK, Gaussian, 2.4 kbps), both verified per the EVAL-ADF7021-VDB3Z test report. Regulatory pre-scan validation is supported via SMA antenna port and unfiltered conductive emission test points.