Analog Devices Inc. DC1370A-D

Overview

DC1370A-D from Analog Devices (formerly Linear Technology) is a high-performance evaluation board for the LTC2258-14 14-bit, 65Msps analog-to-digital converter. It provides full access to the ADC's differential analog input, configurable CMOS/LVDS digital outputs, SPI interface, and clock conditioning circuitry. Designed for RF sampling applications, it supports undersampling of IF signals up to 140MHz with 74dB SNR and 88dB SFDR at 65Msps.

For engineers reviewing the DC1370A-D datasheet, DC1370A-D pinout, DC1370A-D application, or DC1370A-D equivalent, this page delivers verified hardware configuration details, layout-validated signal integrity guidance, power sequencing requirements, and real-world performance validation data from the official DC1370A-D user guide and schematic.

Technical Context

The DC1370A-D implements a complete signal chain for the LTC2258-14, including a transformer-coupled 50Ω single-ended-to-differential analog front-end, adjustable clock conditioning via LTC6957-3, and selectable output termination for CMOS or LVDS modes. It supports all three operating modes of the LTC2258-14: full-rate CMOS, DDR CMOS, and DDR LVDS - each with dedicated PCB routing and impedance-controlled traces.

Board-level features include on-board SPI programming via USB-SPI interface (LTC2309-based), jumper-selectable reference source (internal/external), VCM biasing network, and precision 1.8V analog/digital supply regulation. The design adheres to strict RF layout practices: ground plane isolation between analog and digital sections, controlled-impedance 50Ω transmission lines, and minimized loop area for high-frequency clock paths.

Key Specifications

Availability

DC1370A-D is available at Aetrix Electronics and suitable for RF test equipment, software-defined radio development, portable medical ultrasound front-ends, and multi-channel data acquisition systems requiring stable component supply and validated high-speed ADC evaluation platforms.

Supply support for DC1370A-D 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) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving communications, industrial, automotive, and healthcare markets.

The DC1370A-D belongs to ADI's Linear Technology Evaluation Board product line, engineered to accelerate time-to-prototype for high-speed data converters by providing production-grade layout, calibrated performance validation, and comprehensive documentation - specifically targeting RF sampling, IF digitization, and wideband signal capture applications.

FAQ

What is the primary function of the DC1370A-D evaluation board?

The DC1370A-D evaluation board is a fully assembled and tested platform designed to demonstrate and validate the performance of the LTC2258-14 14-bit, 65Msps analog-to-digital converter. It enables rapid prototyping of high-speed sampling systems by providing optimized analog input conditioning, flexible digital output interfaces (CMOS/LVDS), precise clock management, and USB-based SPI configuration - all implemented per Linear Technology's reference design guidelines for the DC1370A-D.

Does the DC1370A-D support both internal and external voltage references for the LTC2258-14?

Yes, the DC1370A-D supports both internal and external reference configurations for the LTC2258-14. A jumper selects between the onboard 1.25V internal reference (VREF) and an external reference applied to the SENSE pin. When using the internal reference, the board routes VREF to the LTC2258-14's REFH/REFL pins with proper 0.1µF/1µF bypassing - as specified in the DC1370A-D schematic and user guide.

Can the DC1370A-D be used with the LTC2257-14 or LTC2256-14 pin-compatible ADCs?

Yes, the DC1370A-D is mechanically and electrically compatible with the LTC2257-14 (40Msps) and LTC2256-14 (25Msps), as all three devices share identical 40-pin QFN (6mm × 6mm) packaging, pinout, and register map. The board's power delivery, clocking, and I/O circuitry meet the specifications for all variants - confirmed by the DC1370A-D user guide, which explicitly lists support for the entire LTC2256/LTC2257/LTC2258 family.

What clock sources are supported by the DC1370A-D for driving the LTC2258-14 encode inputs?

The DC1370A-D supports multiple clock source options: a front-panel SMA connector for external differential (LVDS/PECL) or single-ended (CMOS/TTL) clocks, and an on-board LTC6957-3 ultra-low-jitter clock generator that accepts a 10MHz–250MHz reference and produces a clean 65MHz (or user-configurable) differential encode signal. Both paths include AC coupling and common-mode biasing aligned with LTC2258-14 ENC+/ENC– requirements per the DC1370A-D schematic.

How is SPI communication implemented on the DC1370A-D for configuring the LTC2258-14?

SPI communication on the DC1370A-D is implemented via an integrated USB-to-SPI bridge using the LTC2309 I²C/SPI controller and FT232RL USB UART. This allows direct register read/write access to the LTC2258-14's configuration registers through PC software (DC1370A-D demo software). All SPI signals (CS, SCK, SDI, SDO) are routed with controlled impedance and proper termination - matching the timing and drive strength requirements defined in the DC1370A-D user guide and LTC2258-14 datasheet.