Analog Devices Inc. DC792A

Overview

DC792A from Analog Devices (formerly Linear Technology) is a demonstration circuit board built around the LT5525 high-linearity, low-power active downconverting mixer IC. It supports 1900MHz RF to 140MHz IF conversion with ±1MHz two-tone intermodulation testing, delivers –1.9dB conversion gain at –5dBm LO drive, and achieves +17.6dBm IIP3 under 28mA supply current at 5V.

For engineers reviewing the DC792A datasheet, DC792A pinout, DC792A application, or DC792A equivalent, this evaluation platform enables rapid characterization of RF front-end linearity, LO-RF isolation (38dB), noise figure (15.1dB SSB), and spurious suppression (–59dBc for 3RF-3LO) in wireless infrastructure and point-to-point radio designs.

Technical Context

DC792A implements the LT5525 as a fully assembled, impedance-matched evaluation platform with SMA connectors for RF-in (J1), LO-in (J3), and IF-out (J2). The board uses discrete matching networks to achieve >12dB RF port return loss from 1300MHz to 2300MHz and 10dB IF port return loss bandwidth centered at 140MHz.

The design supports both low-side and high-side LO injection, includes on-board 5V power regulation, and features an enable-controlled power path (EN pin E1) with absolute max ratings of +10dBm RF/LO input and 5.5V supply voltage - all aligned with LT5525's internal 50Ω LO match and integrated RF buffer amplifier architecture.

Key Specifications

Availability

DC792A is available at Aetrix Electronics and suitable for wireless infrastructure validation, point-to-point radio development, and cable access node prototyping requiring stable component supply and repeatable RF performance verification.

Supply support for DC792A 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. (including legacy Linear Technology products) is a global leader in high-performance analog, mixed-signal, and RF ICs for precision signal processing and connectivity applications.

The DC792A belongs to Linear Technology's Demonstration Circuit (Demo Board) product line, designed specifically to accelerate evaluation of RF signal chain components like mixers, amplifiers, and synthesizers in real-world system configurations.

FAQ

What is the primary function of the DC792A demonstration circuit?

The DC792A demonstration circuit is a fully assembled evaluation platform for the LT5525 active downconverting mixer IC. It enables engineers to rapidly validate RF-to-IF conversion performance-including conversion gain, IIP3, noise figure, and spurious output-under controlled lab conditions using standard test equipment. The DC792A provides calibrated SMA interfaces, on-board biasing, and impedance-matched ports to eliminate prototyping overhead when characterizing the LT5525 in wireless infrastructure applications.

Does DC792A support both low-side and high-side LO injection?

Yes, DC792A supports both low-side and high-side LO injection configurations as specified in its Quick Start Guide. The board's RF and IF matching networks are optimized for 1900MHz RF input and 140MHz IF output, but the underlying LT5525 architecture allows flexible LO placement relative to the RF carrier. This dual-mode capability makes DC792A suitable for evaluating image-reject receiver topologies and frequency planning trade-offs in point-to-point radio systems using the DC792A.

What are the absolute maximum ratings for DC792A's power and signal inputs?

The DC792A has an absolute maximum supply voltage of 5.5V and supports RF and LO input power up to +10dBm each. Exceeding these limits risks permanent damage to the LT5525 IC or passive matching components. The enable pin (E1) must never exceed VCC + 0.3V, and power sequencing requires VCC to be applied before EN. These constraints are critical for reliable operation during repeated measurement cycles on the DC792A.

How is RF port matching verified on DC792A?

RF port matching on DC792A is verified via >12dB return loss across 1300MHz–2300MHz, measured at the J1 SMA connector. This broadband match is achieved using discrete surface-mount matching networks tuned to the LT5525's internal RF port characteristics. The specification ensures minimal signal reflection during two-tone and spurious testing, enabling accurate IIP3 and conversion gain measurements without external tuning - a key validation feature of the DC792A platform.

Can DC792A be used to measure 2RF-2LO and 3RF-3LO spurious outputs?

Yes, DC792A supports direct measurement of 2RF-2LO (–53dBc) and 3RF-3LO (–59dBc) spurious outputs using its defined test procedure. By setting the RF input to fRF = fLO ± fIF/2 or fRF = fLO ± fIF/3 and observing the 140MHz IF output, users isolate and quantify these specific mixing products. The board's layout and component selection minimize parasitic contributions, making DC792A a trusted reference for spurious analysis in RF receiver design workflows.