Analog Devices Inc. ADRF5731-EVALZ

Overview

ADRF5731-EVALZ from Analog Devices is a 4-layer evaluation board designed to characterize the ADRF5731 4-bit silicon digital attenuator (100 MHz–40 GHz, 2 dB LSB, 30 dB range) in real RF systems. It features 2.4 mm RF launchers (J1/J2), coplanar waveguide transmission lines (50 Ω), dual ±3.3 V supply test points (TP1/TP2), and a 2×9-pin digital header (P1) for SPI/parallel control. Used for millimeter-wave 5G infrastructure and test instrumentation validation.

For engineers reviewing the ADRF5731-EVALZ datasheet, ADRF5731-EVALZ pinout, ADRF5731-EVALZ application, or ADRF5731-EVALZ equivalent, this board enables de-embedded device-level performance measurement via thru calibration, supports hot-switching up to 30 dBm peak RF input, and provides thermal and RF grounding optimized for >26 GHz operation using Rogers RO4003 dielectric.

Technical Context

The ADRF5731-EVALZ implements a calibrated RF path with thru-line (J3–J4) for vector network analyzer (VNA) de-embedding, enabling extraction of true ADRF5731 insertion loss, step error, and relative phase across 100 MHz–40 GHz. Its 12-mil RO4003 top dielectric and 62-mil total thickness support 2.4 mm connector mechanical compatibility and stable impedance.

Board layout isolates RF traces on the top layer while dedicating inner and bottom layers as solid ground planes; >100 thermal vias surround the ADRF5731 LGA package's exposed pad and RF lines to maintain case temperature ≤+105°C under 26 dBm average RF load. Digital control routing includes RC filter footprints (unpopulated by default) and 0 Ω series resistors for noise mitigation.

Key Specifications

Availability

ADRF5731-EVALZ is available at Aetrix Electronics and suitable for 5G mmWave base station development, microwave radio design, and high-frequency test instrumentation requiring stable component supply, calibrated RF evaluation capability, and production-ready layout reference.

Supply support for ADRF5731-EVALZ 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 semiconductor company specializing in high-performance analog, mixed-signal, and RF technologies for precision signal processing.

The ADRF5731-EVALZ belongs to Analog Devices' RF & Microwave Evaluation Platform product line, engineered to accelerate time-to-test for ultrawideband silicon RF components operating beyond 26 GHz.

FAQ

What is the primary purpose of the ADRF5731-EVALZ evaluation board?

The ADRF5731-EVALZ evaluation board is specifically designed to enable accurate, de-embedded characterization of the ADRF5731 4-bit digital attenuator across its full 100 MHz–40 GHz frequency range. It provides calibrated RF paths via 2.4 mm launchers and a dedicated thru-line (J3–J4) for vector network analyzer calibration, allowing engineers to isolate the intrinsic performance-such as insertion loss, step error, and relative phase-of the ADRF5731 itself without PCB parasitic effects.

Does the ADRF5731-EVALZ support both serial and parallel control modes for the ADRF5731 IC?

Yes, the ADRF5731-EVALZ fully supports both control modes of the ADRF5731 IC. Digital signals for SPI (SERIN, CLK, SEROUT, LE) and parallel (D2–D5, PS) are routed to a 2×9-pin header (P1), with configurable pull-up/down options and unpopulated RC filter footprints. The PS pin is accessible to select mode, and LE toggling is supported for latched parallel operation-ensuring direct validation of all ADRF5731 interface specifications per Rev. B datasheet.

What RF launchers are used on the ADRF5731-EVALZ, and why are they not soldered?

The ADRF5731-EVALZ uses 2.4 mm female RF launchers (J1 for ATTIN, J2 for ATTOUT) that connect via mechanical contact-not solder-to preserve signal integrity above 26 GHz. This design avoids solder-induced impedance discontinuities and thermal stress on the RF path, while enabling quick connector replacement and repeatable VNA calibration. The board's 62-mil thickness and RO4003 dielectric are precisely matched to 2.4 mm launcher mechanical requirements.

How does the ADRF5731-EVALZ handle thermal management for the ADRF5731 IC during high-power operation?

The ADRF5731-EVALZ employs aggressive thermal design: the ADRF5731's exposed pad is connected to internal and bottom ground planes via >100 plated through vias, and the entire RF trace area is surrounded by dense via fences. Combined with 1.5 oz copper plating on top/bottom layers and RO4003's low-loss, high-thermal-conductivity properties, this maintains case temperature within −40°C to +105°C limits even at 26 dBm average RF input-matching the ADRF5731's rated operating envelope.

Can the ADRF5731-EVALZ be used for hot-switching validation of the ADRF5731 IC?

Yes, the ADRF5731-EVALZ supports hot-switching validation per ADRF5731's specified limits: 24 dBm average and 27 dBm peak at ATTIN under hot-switch conditions (TCASE = 85°C). Its robust 50 Ω CPWG routing, low-inductance ground vias, and dual-supply decoupling (100 pF at TP1/TP2) ensure stable bias and minimal transient disturbance during rapid attenuation state changes-enabling measurement of ADRF5731's 230 ns RF amplitude settling time (0.1 dB) in system-relevant conditions.