Analog Devices Inc. ADL5721-EVALZ

Overview

ADL5721-EVALZ from Analog Devices is an evaluation board designed to characterize the ADL5721 5.9 GHz–8.5 GHz SiGe low-noise amplifier (LNA) in differential RF receiver paths. It supports single 5 V input with onboard ADM7170 and ADM7172 regulators generating 1.8 V (VCC1) and 3.3 V (VCC2), features a jumper-selectable BAND pin (0 V / 1.8 V), and delivers verified gain >24.6 dB, noise figure <1.7 dB, and IIP3 >4.0 dBm across its dual-band operation.

For engineers reviewing the ADL5721-EVALZ datasheet, ADL5721-EVALZ lab setup, ADL5721-EVALZ schematic, or ADL5721-EVALZ software configuration, this board enables rapid validation of microwave LNA performance in SATCOM, point-to-point radios, and phased array front-ends-especially when interfacing with differential downconverters or RF-sampling ADCs requiring 100 Ω balanced outputs.

Technical Context

The ADL5721-EVALZ implements the ADL5721 LNA in a fully populated, impedance-matched layout with 50 Ω single-ended input and 100 Ω differential output traces routed to SMA connectors (RFOP/RFON). It integrates dedicated 1.8 V and 3.3 V LDOs (ADM7170ACPZ-1.8 and ADM7172ACPZ-3.3), decoupling networks per pin (including 4.7 µF/0.1 µF/33 pF/4.7 nF capacitors), and thermal management via soldered exposed pad connected to internal ground planes.

Band selection is implemented via P1 jumper: shorting Pins 1–2 configures BAND = 0 V (5.9–7.2 GHz), while opening selects BAND = 1.8 V (7.1–8.5 GHz), enabling system-level trade-off between noise figure and input linearity. The Rev. A board includes test loops for direct supply injection and supports hybrid-based differential-to-single-ended measurement using external 180° hybrids.

Key Specifications

Availability

ADL5721-EVALZ is available at Aetrix Electronics and suitable for microwave radio link development, SATCOM terminal prototyping, and phased array receiver validation requiring stable component supply, traceable evaluation hardware, and documented RF performance benchmarks.

Supply support for ADL5721-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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design and manufacturing expertise spanning RF, precision instrumentation, and power management.

The ADL5721-EVALZ belongs to Analog Devices' RF & Microwave Evaluation Platform family, engineered specifically to accelerate time-to-test for narrowband GaAs/SiGe LNAs targeting 5G backhaul, defense radar, and satellite communications infrastructure.

FAQ

What is the primary function of the ADL5721-EVALZ?

The ADL5721-EVALZ is a fully assembled evaluation board for the ADL5721 low-noise amplifier IC. Its primary function is to enable engineers to rapidly evaluate RF performance-including gain, noise figure, IIP3, and P1dB-across the 5.9–8.5 GHz frequency range under real-world bias and thermal conditions. The ADL5721-EVALZ provides calibrated SMA interfaces, regulated power, and jumper-based band selection to replicate production-ready LNA behavior without custom PCB design.

Does the ADL5721-EVALZ require external power supplies?

No, the ADL5721-EVALZ operates from a single 5 V DC supply. Onboard ADM7170ACPZ-1.8 and ADM7172ACPZ-3.3 LDOs generate the precise 1.8 V (VCC1) and 3.3 V (VCC2) rails required by the ADL5721 IC. Test loops are provided for optional direct 1.8 V/3.3 V injection, but default operation uses only the 5 V input-making the ADL5721-EVALZ ideal for bench testing with standard lab power supplies.

How is band selection implemented on the ADL5721-EVALZ?

Band selection on the ADL5721-EVALZ is controlled via the P1 jumper. Shorting Pins 1 and 2 applies 0 V to the BAND pin, configuring the ADL5721 for the low-frequency band (5.9–7.2 GHz); opening the jumper applies 1.8 V, selecting the high-frequency band (7.1–8.5 GHz). This hardware-based switching allows immediate reconfiguration between noise-optimized and linearity-optimized modes without modifying firmware or supply voltages.

Can the ADL5721-EVALZ be used with single-ended test equipment?

Yes-the ADL5721-EVALZ supports single-ended measurement via external 180° hybrid couplers. Connect RFOP and RFON to the hybrid's differential ports, terminate the sum port in 50 Ω, and measure the difference port output on a spectrum analyzer or VNA. The board's layout preserves amplitude/phase balance, and Figures 32–33 in the ADL5721 datasheet show validated results using this method-confirming the ADL5721-EVALZ's compatibility with standard single-ended lab instrumentation.

What thermal considerations apply to the ADL5721-EVALZ during extended operation?

The ADL5721-EVALZ uses the ADL5721's thermally enhanced 2 mm × 2 mm LFCSP package with an exposed pad soldered directly to a low-impedance ground plane and 3×4 thermal vias. At full bias (88 mA total current), junction temperature remains within specification (−40°C to +85°C) when mounted on a standard 4-layer PCB with adequate copper area. No heatsink is required, but airflow >1 m/s is recommended for continuous operation above +70°C ambient to maintain ADL5721-EVALZ performance stability.