Analog Devices Inc. ADRF5740-EVALZ-185

Overview

ADRF5740-EVALZ-185 from Analog Devices is an evaluation board designed to characterize the ADRF5740 4-bit silicon digital attenuator (2 dB LSB, 10 MHz–60 GHz), featuring 1.85 mm RF launchers, 4-layer RO4003-based stack-up with 62 mil thickness, and optimized coplanar waveguide routing for 50 Ω impedance. It supports full-frequency validation of insertion loss, step error, and phase stability up to 60 GHz in test and instrumentation environments.

For engineers reviewing the ADRF5740-EVALZ-185 datasheet, ADRF5740-EVALZ-185 pinout, ADRF5740-EVALZ-185 application, or ADRF5740-EVALZ-185 equivalent, this board enables rapid prototyping of millimeter-wave RF front-ends requiring precise 22 dB attenuation control, high linearity (P0.1dB = 25.5 dBm), and sub-200 ns RF settling time in 5G infrastructure, radar, and VSAT systems.

Technical Context

The ADRF5740-EVALZ-185 implements a 4-layer PCB architecture with top-layer 16 mil RF traces and 6 mil ground clearance forming a 50 Ω coplanar waveguide, backed by solid inner/ground planes. Its stack-up uses 12 mil Rogers RO4003 dielectric for optimal high-frequency performance, enabling accurate measurement of the ADRF5740's ultrawideband behavior from 10 MHz to 60 GHz.

It integrates direct RF access via edge-mounted 1.85 mm connectors, dual supply decoupling (100 pF on VDD/VSS), and dense via fencing around the ADRF5740 LGA package (CC-16-6, 2.5 mm × 2.5 mm) to ensure thermal and RF grounding integrity-critical for validating ±0.6 dB step error at 55 GHz and <3.3 dB insertion loss up to that frequency.

Key Specifications

Availability

ADRF5740-EVALZ-185 is available at Aetrix Electronics and suitable for 5G millimeter-wave development, military radar calibration, microwave radio design, and VSAT system integration requiring stable component supply and validated high-frequency reference platforms.

Supply support for ADRF5740-EVALZ-185 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 RF ICs, serving precision instrumentation, communications, industrial, and defense markets since 1965.

The ADRF5740-EVALZ-185 belongs to Analog Devices' RF & Microwave Evaluation Platform product line, engineered specifically to accelerate design-in and characterization of ultrawideband silicon RF components-including digital attenuators, switches, and gain blocks-for applications demanding verified performance beyond 40 GHz.

FAQ

What is the primary function of the ADRF5740-EVALZ-185?

The ADRF5740-EVALZ-185 is a dedicated evaluation board for the ADRF5740 4-bit digital attenuator IC. It provides calibrated RF access via 1.85 mm connectors, optimized PCB layout, and proper biasing to enable accurate measurement of key parameters-including insertion loss, step error, and phase response-across its full 10 MHz to 60 GHz bandwidth. The ADRF5740-EVALZ-185 does not contain active circuitry beyond interface and decoupling components; its sole purpose is to host and validate the ADRF5740 device under real-world RF conditions.

Does the ADRF5740-EVALZ-185 support both latched and direct parallel mode operation of the ADRF5740?

Yes, the ADRF5740-EVALZ-185 supports both latched and direct parallel mode operation of the ADRF5740. Its schematic includes accessible LE, D2–D5 control pins with appropriate pull-up/pull-down options and bypassing, allowing users to configure the ADRF5740 for either mode per the datasheet timing requirements (e.g., tLEW ≥ 10 ns, tPS = 2 ns). The ADRF5740-EVALZ-185 user guide documents jumper and test point configurations for both modes to facilitate functional verification across all 16 attenuation states.

What RF connector type is used on the ADRF5740-EVALZ-185, and why is it specified?

The ADRF5740-EVALZ-185 uses 1.85 mm RF connectors, rated for operation up to 67 GHz. This connector type was selected to match the ADRF5740's operational bandwidth (10 MHz–60 GHz) and minimize measurement uncertainty caused by connector-related reflections or losses above 40 GHz. Unlike SMA or 2.92 mm variants, the 1.85 mm interface ensures low VSWR and repeatable mating-critical when validating the ADRF5740's ±0.6 dB step error and <70° relative phase variation at 55–60 GHz. The ADRF5740-EVALZ-185's mechanical stack-up (62 mil thickness, 1.85 mm launcher compatibility) is explicitly designed for this interface.

How does the ADRF5740-EVALZ-185 ensure accurate high-frequency measurements of the ADRF5740?

The ADRF5740-EVALZ-185 ensures accuracy through three key design elements: (1) a 4-layer RO4003-based stack-up with precisely dimensioned coplanar waveguide (16 mil trace / 6 mil gap) for stable 50 Ω impedance up to 60 GHz; (2) dense via fencing around the ADRF5740 LGA package and RF paths to suppress ground bounce and maintain phase coherence; and (3) edge-mounted 1.85 mm connectors with minimal transition discontinuity. These features collectively minimize parasitic effects that could distort the ADRF5740's measured insertion loss (<3.3 dB at 55 GHz), return loss (>10 dB at 60 GHz), and relative phase tracking-enabling trustworthy validation of the ADRF5740's datasheet specifications.

Is the ADRF5740-EVALZ-185 compatible with the ADRF5740BCCZN RoHS-compliant IC package?

Yes, the ADRF5740-EVALZ-185 is fully compatible with the ADRF5740BCCZN-the production-grade 16-terminal, 2.5 mm × 2.5 mm RoHS-compliant LGA package (CC-16-6) of the ADRF5740 IC. The board's footprint matches the CC-16-6 outline (including exposed pad dimensions and terminal pitch), and its thermal via pattern and solder mask definition comply with Analog Devices' recommended assembly guidelines. All electrical interfaces-including VDD/VSS supply routing, D2–D5/LE control lines, and ATTIN/ATTOUT RF pads-are designed to the exact pinout and drive requirements specified for the ADRF5740BCCZN in the Rev. 0 datasheet.