Analog Devices Inc. DC1057A

Overview

DC1057A from Analog Devices (formerly Linear Technology) is a demonstration circuit board featuring the LT6411 high-speed differential ADC driver and LTC2249 14-bit, 80MSPS analog-to-digital converter. It supports flexible input coupling (AC/DC), gain options (0dB/6dB), single-ended or differential signal paths, and on-board CMOS output buffering with selectable OVDD voltage. The board is designed for evaluating high-fidelity data acquisition front-ends in RF receiver and instrumentation applications.

For engineers reviewing the DC1057A datasheet, DC1057A pinout, DC1057A application, or DC1057A equivalent, key considerations include its dual-component signal chain architecture, 40-pin edge connector interface to DC718, configurable input networks for transformer/single-ended/differential drive, and support for QuickEval-II software-based FFT and SNR analysis.

Technical Context

The DC1057A implements a complete signal chain where the LT6411 drives the LTC2249 ADC with user-selectable gain, common-mode voltage, and filtering - including optional band-pass L-C network at the driver output. Input configuration supports transformer-coupled (default), single-ended, or fully differential AC- or DC-coupled topologies via jumper and component placement.

It integrates power domain separation: VCC for LT6411, VDD for LTC2249 core, and OVDD (adjustable) for CMOS output buffers and ADC digital outputs. The on-board clock buffer IC conditions the encode clock from SMA J4 to meet LTC2249's jitter sensitivity requirements (<100 fs RMS typical for optimal SNR).

Key Specifications

Availability

DC1057A is available at Aetrix Electronics and suitable for RF receiver evaluation, high-speed data acquisition system prototyping, and precision ADC driver characterization requiring stable component supply and documented reference design validation.

Supply support for DC1057A 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. (ADI) acquired Linear Technology in 2017 and maintains full technical and supply continuity for all Linear demo circuits and components.

The DC1057A belongs to ADI's legacy Linear Technology demonstration circuit portfolio, developed specifically to validate high-speed signal chain performance - emphasizing layout best practices, noise-sensitive analog routing, and interoperability with QuickEval-II software and DC718 data acquisition hardware.

FAQ

What is the primary function of the DC1057A demonstration board?

The DC1057A demonstration board is a validated reference design that integrates the LT6411 high-speed differential amplifier and LTC2249 14-bit, 80MSPS ADC to showcase optimal PCB layout, component selection, and signal integrity techniques for high-performance data acquisition. It is not a production component but a lab-ready evaluation platform for characterizing ADC driver–ADC interfaces under real-world conditions. DC1057A enables rapid validation of SNR, SFDR, and THD metrics using standard lab equipment and QuickEval-II software.

Does the DC1057A support both AC-coupled and DC-coupled analog inputs?

Yes, the DC1057A supports both AC-coupled and DC-coupled analog inputs through configurable component placement and jumper settings defined in Table 2 of its documentation. For DC coupling, CIN+ and CIN− must be replaced with 0Ω jumpers, and input common-mode voltage must be level-shifted to meet the LT6411's specified VCM range (typically 1.25 V to 3.0 V). DC1057A includes biasing networks (e.g., R37/R38) and feedback path options to accommodate this requirement safely.

Which software and hardware are required to capture and analyze data from the DC1057A?

To capture and analyze data from the DC1057A, you need the DC718 QuickDAACS data acquisition board, a Windows PC, a USB cable, and Analog Devices' free QuickEval-II software (downloadable from analog.com). The DC1057A connects to the DC718 via its 40-pin edge connector, and QuickEval-II configures the LTC2249 registers, acquires parallel CMOS output data, and computes FFTs, SNR, SFDR, and other key ADC performance metrics. DC1057A does not operate standalone - it requires this host ecosystem.

Can the DC1057A be used with ADCs other than the LTC2249?

No - the DC1057A is a fixed-function demonstration board designed exclusively around the LTC2249 14-bit, 80MSPS ADC and LT6411 driver. Its layout, power domains (VDD, OVDD), timing constraints, and CMOS output buffer drive strength are optimized for that specific ADC. While the LT6411 section is configurable, the board lacks provisions for swapping or reworking the ADC. For alternate ADC evaluation, Analog Devices offers other demo boards such as DC1372A (LTC2262) or DC1925A (LTC2378).

What is the role of the on-board clock buffer IC on the DC1057A?

The on-board clock buffer IC on the DC1057A conditions the external encode clock (applied via SMA connector J4) into a low-skew, high-amplitude 3.3V LVCMOS signal suitable for driving the LTC2249's sensitive encode input. This stage reduces jitter-induced SNR degradation - critical because the LTC2249's SNR drops >1 dB for every ~50 fs increase in clock jitter above 100 fs RMS. The buffer ensures robust timing margin even when using moderate-quality synthesizers, making DC1057A less dependent on ultra-low-jitter lab sources.