Analog Devices Inc. DC753A

Overview

DC753A from Analog Devices (formerly Linear Technology) is a demonstration circuit board built around the LT5526 high-linearity, low-power downconverting mixer IC. It supports 900MHz RF to 140MHz IF conversion with 0.6dB conversion gain, 16.5dBm IIP3, and 11.0dB single-sideband noise figure at 5V supply. It is used for evaluating RF front-end performance in wireless infrastructure and point-to-point data links.

For engineers reviewing the DC753A datasheet, DC753A pinout, DC753A application, or DC753A equivalent, this page provides verified functional context, measured RF/IF/LO interface behavior, power sequencing requirements, absolute maximum ratings, and evaluation setup guidance per the official Quick Start Guide and Application Note.

Technical Context

Demonstration Circuit 753 implements the LT5526 as a fully assembled, SMA-connected evaluation platform with on-board 50Ω matching networks for RF (750–1350MHz), LO (100MHz–2.7GHz via 100pF DC blocks), and IF (140MHz ±100MHz). The board uses external jumpers for enable control and fixed 3.6–5.25V DC input.

It supports both low-side and high-side LO injection, delivers 55dB RF-to-LO isolation, and enables measurement of critical mixer metrics including 2RF-2LO (–72dBc) and 3RF-3LO (–68dBc) spurious outputs, input 1dB compression (+5dBm), and LO leakage (–65dBm LO-to-RF, –74dBm LO-to-IF).

Key Specifications

Availability

DC753A is available at Aetrix Electronics and suitable for wireless infrastructure validation, RF front-end characterization, and point-to-point link prototyping requiring stable component supply and traceable evaluation hardware.

Supply support for DC753A 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 acquired Linear Technology in 2017 and maintains its high-performance signal chain product lines, including RF mixers, amplifiers, and precision analog ICs.

The DC753A belongs to Linear's demonstration circuit series designed specifically to accelerate evaluation of LT5526 mixer performance in real-world RF downconversion applications without custom PCB development.

FAQ

What is the primary function of the DC753A demonstration circuit?

The DC753A demonstration circuit is a ready-to-use evaluation platform for the LT5526 broadband downconverting mixer IC. Its primary function is to enable rapid characterization of RF-to-IF conversion performance-including conversion gain, IIP3, noise figure, and spurious output-at 900MHz RF and 140MHz IF. DC753A provides calibrated SMA interfaces, proper biasing, and matching networks so engineers can validate mixer behavior without designing custom hardware.

Does DC753A support both low-side and high-side LO injection?

Yes, DC753A supports both low-side and high-side LO injection configurations as specified in the official Quick Start Guide. The board's RF and LO port matching, combined with the LT5526's internal architecture, allows flexible LO placement relative to the RF carrier-enabling system-level trade-offs between image rejection, filter complexity, and local oscillator phase noise impact. This dual-mode capability is confirmed in the DC753A application note and is integral to its use in wireless infrastructure evaluation.

What are the absolute maximum ratings for DC753A's power and signal inputs?

The absolute maximum ratings for DC753A are defined by the LT5526 IC it hosts: supply voltage must not exceed 5.5V; RF and LO input power must each stay at or below +10dBm; and the enable pin voltage must remain within –0.3V to VCC+0.3V. Exceeding any of these limits risks permanent damage to the LT5526 on DC753A. These values are explicitly listed in the DC753A Absolute Maximum Input Rating table and apply directly to the demo board's operational boundaries.

How is the enable function implemented on DC753A?

The enable function on DC753A is implemented via a jumper connection between the Vcc pin (E1) and EN pin (E3), as detailed in the Quick Start Procedure. When shorted, this applies Vcc to the LT5526's EN pin, powering up the mixer core and enabling RF/IF signal path operation. The board requires Vcc to be applied before the EN jumper is installed to prevent overvoltage on the EN pin. This discrete, manual enable method ensures safe power sequencing and matches the LT5526's recommended startup sequence.

Can DC753A be used outside its 900MHz RF / 140MHz IF nominal configuration?

Yes, DC753A can be used beyond its nominal 900MHz RF / 140MHz IF configuration. The RF port maintains >10dB return loss from 750MHz to 1350MHz, and the IF port offers 200MHz bandwidth centered at 140MHz. With appropriate external matching components and LO tuning, the board supports other RF/IF combinations - as confirmed in the DC753A Application Note. However, full performance metrics (e.g., IIP3, noise figure) are only guaranteed at the characterized 900/140MHz point unless re-validated.