Analog Devices Inc. ADL5902-EVALZ

Overview

ADL5902-EVALZ from Analog Devices is a fully populated, RoHS-compliant evaluation board designed to characterize the ADL5902 true RMS power detector IC - a 50 MHz to 9 GHz, 65 dB dynamic range RF power measurement solution used in transmitter signal strength indication (TSSI), PA linearization loops, and RF instrumentation. It supports single-ended 50 Ω input drive without balun or external matching.

For engineers reviewing the ADL5902-EVALZ datasheet, ADL5902-EVALZ schematic, ADL5902-EVALZ layout, or ADL5902-EVALZ test setup, this board enables rapid validation of the ADL5902's logarithmic output scaling (53 mV/dB), temperature-stable rms-to-dc conversion, and controller-mode operation across LTE, W-CDMA, and CDMA-modulated signals up to 2.6 GHz.

Technical Context

The ADL5902-EVALZ implements the full functional interface of the ADL5902 IC, including VSET-controlled closed-loop power control, VTGT-adjustable amplitude target, CLPF-configurable loop response, and dual-mode operation (measurement or controller). It routes all 16 pins of the 4 mm × 4 mm LFCSP package to accessible test points and SMA connectors.

Board-level design incorporates decoupling capacitors per datasheet recommendations, 0.1 μF CLPF capacitor for standard bandwidth, calibrated input coupling network, and buffered VREF (2.3 V) and TEMP (1.4 V @ 25°C, 4.9 mV/°C) outputs - enabling simultaneous RF power measurement, temperature compensation, and system calibration.

Key Specifications

Availability

ADL5902-EVALZ is available at Aetrix Electronics and suitable for RF power measurement validation, transmitter calibration, and high-frequency instrumentation development requiring stable component supply and traceable evaluation hardware.

Supply support for ADL5902-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.

The ADL5902-EVALZ belongs to Analog Devices' RF & Microwave Evaluation Platform family, engineered specifically to accelerate prototyping and characterization of true RMS power detectors in wireless infrastructure, defense, and test equipment applications.

FAQ

What is the primary function of the ADL5902-EVALZ?

The ADL5902-EVALZ is an evaluation board that enables full characterization of the ADL5902 true RMS power detector IC. It provides ready-to-use SMA interfaces, jumper-configurable operation modes (measurement or controller), and access to all critical pins - allowing engineers to validate logarithmic output scaling (53 mV/dB), temperature stability (<±0.3 dB), and modulation-independent response across 50 MHz to 9 GHz before integration into final systems.

Does the ADL5902-EVALZ require external baluns or matching networks?

No. The ADL5902-EVALZ is designed to operate with the ADL5902's native single-ended 50 Ω input architecture. Its RF input path uses AC-coupled SMA connections directly to the INHI and INLO pins, eliminating the need for baluns or external impedance-matching components - consistent with the ADL5902's specified operation up to 9 GHz.

How is the CLPF capacitor configured on the ADL5902-EVALZ?

The ADL5902-EVALZ ships with a 0.1 μF capacitor installed on the CLPF pin (Pin 5) as recommended in the ADL5902 datasheet for stable loop response and <±0.1 dB transfer function ripple. A footprint is provided for optional series resistor placement to adjust rise/fall time - supporting customization for specific modulation bandwidths like LTE or W-CDMA.

Can the ADL5902-EVALZ be used in controller mode for PA linearization?

Yes. The ADL5902-EVALZ includes a dedicated jumper to connect VOUT to external gain-control elements (e.g., VGA or attenuator) while applying a setpoint voltage to VSET (Pin 7). This enables closed-loop transmitter power control - where a 50 mV change in VSET adjusts the required input power by ~1 dB - validated for use with ADL5902 in PA linearization applications per its datasheet controller-mode specifications.

What temperature range does the ADL5902-EVALZ support during operation?

The ADL5902-EVALZ supports the full operating temperature range of the ADL5902 IC: −40°C to +125°C. It provides direct access to the TEMP pin (1.4 V @ 25°C, 4.9 mV/°C) and TADJ/PWDN pin for temperature compensation and power-down control, ensuring accurate characterization of ADL5902's deviation vs. temperature performance (e.g., <±0.3 dB over −40°C to +125°C at 0 dBm input).