Analog Devices Inc. ADL5372ACPZ-WP

Overview

ADL5372ACPZ-WP from Analog Devices is a fixed-gain quadrature modulator operating from 1500 MHz to 2500 MHz, designed for direct RF upconversion in broadband wireless transmitters. It accepts differential I/Q baseband inputs (1.4 V_p-p, 500 mV dc bias) and a single-ended LO, delivering a single-ended RF output with 7.1 dBm typical power at 1900 MHz, −45 dBc sideband suppression, and −158 dBm/Hz noise floor - enabling high-fidelity modulation in WCDMA and WiMAX base stations.

For engineers reviewing the ADL5372ACPZ-WP datasheet, ADL5372ACPZ-WP pinout, ADL5372ACPZ-WP application, or ADL5372ACPZ-WP equivalent, key selection criteria include its 24-lead LFCSP package, >500 MHz baseband bandwidth, 14.2 dBm P1dB compression, carrier feedthrough of −45 dBm at 1900 MHz, and compatibility with DACs such as AD9779A for digital predistortion systems.

Technical Context

The ADL5372ACPZ-WP implements a silicon-germanium Gilbert-cell mixer architecture with integrated polyphase LO quadrature splitter and on-chip balun. Its V-to-I baseband interface requires precise 500 mV dc common-mode biasing and delivers >500 MHz 3 dB baseband bandwidth, supporting zero-IF and low-IF architectures.

It features differential IBBP/IBBN and QBBP/QBBN inputs, single-ended LOIP/LOIN (−6 to +6 dBm drive), and single-ended VOUT with internal 50 Ω-balun output stage. Performance is specified across −40°C to +85°C with 165 mA supply current at 5 V.

Key Specifications

Pinout & Package

ADL5372ACPZ-WP is housed in a 24-lead, 4 mm × 4 mm, exposed-paddle LFCSP (Lead Frame Chip Scale Package) compliant with RoHS and optimized for RF thermal and grounding performance. The exposed paddle must be soldered to a low-impedance ground plane using ≥9 vias.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quadrature modulator applications.

Compared with ADL5372ACPZ-WP, ADL5375ACPZ-R7 offers broader frequency coverage but lower sideband suppression, while TRF3705IRGZT integrates LO synthesis at the cost of noise and linearity - making ADL5372ACPZ-WP optimal for high-fidelity, narrowband 4G/LTE FDD uplink stages where EVM and ACLR are critical.

Availability

ADL5372ACPZ-WP is available at Aetrix Electronics and suitable for cellular infrastructure, WiMAX radio units, and WCDMA femtocells requiring stable component supply, long-term lifecycle support, and traceable sourcing for production ramp.

Supply support for ADL5372ACPZ-WP 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 communications, industrial, and aerospace markets with precision signal processing solutions.

The ADL5372ACPZ-WP belongs to Analog Devices' fixed-gain quadrature modulator (F-MOD) family, engineered specifically for high-linearity, low-noise direct RF upconversion in broadband wireless infrastructure transmitters.

FAQ

What is the recommended LO drive level for ADL5372ACPZ-WP in WCDMA applications?

The recommended LO drive level for ADL5372ACPZ-WP in WCDMA applications is 0 dBm single-ended applied to LOIP, with LOIN ac-coupled to ground. At 2140 MHz, this yields −157.5 dBm/Hz noise floor and −44 dBc sideband suppression. Drive levels up to +6 dBm may improve noise but degrade sideband suppression; ADL5372ACPZ-WP characterization confirms optimal trade-off at 0 dBm for WCDMA ACLR compliance.

Does ADL5372ACPZ-WP require external dc biasing on its baseband inputs?

Yes, ADL5372ACPZ-WP requires external dc biasing: all four baseband inputs (IBBP, IBBN, QBBP, QBBN) must be biased to 500 mV dc with a differential ac swing of 1.4 V_p-p. The device has no internal bias circuitry - failure to apply correct common-mode voltage results in degraded I/Q balance and increased carrier feedthrough. ADL5372ACPZ-WP datasheet specifies 400–600 mV as allowable range, but 500 mV maximizes dynamic range.

Can ADL5372ACPZ-WP be used with the AD9779A DAC without level-shifting circuitry?

Yes, ADL5372ACPZ-WP interfaces directly with the AD9779A DAC without level-shifting circuitry. The AD9779A's nominal 1.4 V_p-p differential output swing and 500 mV common-mode voltage match ADL5372ACPZ-WP's input requirements exactly. AN-1422 confirms this interface, noting that proper ac coupling and termination preserve amplitude balance and phase accuracy across the >500 MHz bandwidth of ADL5372ACPZ-WP.

What is the thermal resistance (θ_JA) of ADL5372ACPZ-WP and how should the exposed paddle be handled?

The thermal resistance θ_JA of ADL5372ACPZ-WP is 54°C/W when the exposed paddle is soldered to a low-impedance ground plane. Per the datasheet, the paddle must be connected using ≥9 vias to an internal ground layer; adjacent COM pins (COM1–COM4) must also tie to the same ground. Inadequate paddle grounding raises junction temperature beyond the 150°C absolute maximum, risking reliability degradation in continuous-wave ADL5372ACPZ-WP operation.

How does carrier feedthrough vary with temperature for ADL5372ACPZ-WP at 1900 MHz?

Carrier feedthrough for ADL5372ACPZ-WP at 1900 MHz varies from −45 dBm at +25°C to −41 dBm at +85°C and −45 dBm at −40°C, as shown in Figure 10 of the datasheet. This 4 dB shift between extremes reflects temperature-dependent I/Q offset drift. For production systems, ADL5372ACPZ-WP supports one-time nulling at room temperature; residual feedthrough remains below −60 dBm after nulling across the full −40°C to +85°C range per Figure 11.