Analog Devices Inc. ADL5375-05-EVALZ

Overview

ADL5375-05-EVALZ from Analog Devices is a fully assembled, lead-free evaluation board for the ADL5375-05 broadband quadrature modulator IC. It enables rapid RF transmitter characterization across 400 MHz to 6 GHz, supporting zero-IF and low-IF architectures with verified sideband suppression ≤−50 dBc and carrier feedthrough ≤−40 dBm at 900 MHz. The board integrates calibrated baseband interface circuitry, single-ended LO input, and 50 Ω RF output for immediate lab validation.

For engineers reviewing the ADL5375-05-EVALZ datasheet, ADL5375-05-EVALZ pinout, ADL5375-05-EVALZ application, or ADL5375-05-EVALZ equivalent, this evaluation platform provides traceable RF performance data, documented layout practices for LFCSP_VQ thermal management, and direct interfacing guidance for DACs (e.g., AD9122), PLLs (e.g., ADF4350), and baseband signal sources in cellular, WiMAX, and satellite modem designs.

Technical Context

The ADL5375-05-EVALZ implements the ADL5375-05 IC in a 24-lead LFCSP_VQ package with exposed paddle grounding, configured for 500 mV baseband bias level operation. It supports single-ended LO drive (−6 dBm to +6 dBm), differential I/Q inputs (1 V_p-p), and delivers SSB output power up to 0.85 dBm at 450 MHz with 1 dB gain flatness from 450 MHz to 3.5 GHz.

Board-level features include on-board 0.1 µF/100 pF supply bypassing at VPS1/VPS2, DSOP-controlled RF output disable (84 dB isolation), and optimized RFOUT matching network achieving ≤−12 dB return loss from 450 MHz to 4.5 GHz. Thermal design follows JESD51-2 guidelines with soldered exposed paddle for θ_JA = 54°C/W.

Key Specifications

Availability

ADL5375-05-EVALZ is available at Aetrix Electronics and suitable for RF transceiver development, wireless infrastructure prototyping, and academic research requiring stable component supply, full documentation access, and manufacturer-validated reference design fidelity.

Supply support for ADL5375-05-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 engineering resources spanning RF, precision instrumentation, and power management.

The ADL5375-05-EVALZ belongs to Analog Devices' RF & Microwave Evaluation Platform product line, designed specifically to accelerate time-to-test for broadband modulators used in multiband cellular base stations, software-defined radios, and satellite communication terminals.

FAQ

What is the primary function of the ADL5375-05-EVALZ?

The ADL5375-05-EVALZ is a dedicated evaluation board for the ADL5375-05 broadband quadrature modulator IC. It provides a complete, tested hardware environment to characterize RF modulation performance-including sideband suppression, carrier feedthrough, and output linearity-across 400 MHz to 6 GHz without custom PCB design. The ADL5375-05-EVALZ enables direct connection to signal generators, spectrum analyzers, and baseband sources for rapid system-level validation.

Can the ADL5375-05-EVALZ be used with the ADL5375-15 modulator IC?

No, the ADL5375-05-EVALZ is electrically and thermally optimized exclusively for the ADL5375-05 variant, which requires a 500 mV baseband input bias level. The ADL5375-15 uses a 1500 mV bias and has different internal biasing networks; substituting it on the ADL5375-05-EVALZ would result in incorrect DC operating points, degraded sideband suppression, and potential damage. Analog Devices specifies separate evaluation boards for each variant.

What LO drive level is required for optimal performance on the ADL5375-05-EVALZ?

The ADL5375-05-EVALZ supports LO drive levels from −6 dBm to +6 dBm at the LOIP pin (with LOIN ac-coupled to ground), as specified in the ADL5375-05 datasheet. Performance testing shows best sideband suppression (≤−52.8 dBc) and carrier feedthrough (≤−45.1 dBm) at 900 MHz with 0 dBm LO drive. Exceeding +6 dBm risks violating absolute maximum ratings and may degrade linearity or cause permanent damage to the ADL5375-05 IC on the board.

Does the ADL5375-05-EVALZ include power supply regulation or require external DC?

The ADL5375-05-EVALZ requires an external, clean 4.75 V to 5.25 V DC supply applied to the VPS1 and VPS2 pins. It does not include onboard voltage regulation or switching converters. The board implements local 0.1 µF and 100 pF bypass capacitors at each supply pin per Analog Devices' layout recommendations, but users must provide a low-noise, well-filtered source capable of delivering up to 203 mA during active modulation.

How is RF output isolation achieved when disabling the ADL5375-05-EVALZ?

RF output isolation on the ADL5375-05-EVALZ is controlled via the DSOP pin: applying a logic high (≥2.0 V) disables the internal RF path, achieving 84 dB typical isolation between RFOUT and the modulator core. This is measured as P_OUT(DSOP low) − P_OUT(DSOP high) at the RFOUT connector. The ADL5375-05-EVALZ maintains this specification across temperature (−40°C to +85°C) and frequency (400 MHz–6 GHz), with <100 ns turn-off settling time ensuring fast TDD or burst-mode operation.