Analog Devices Inc. DC1369A-D

Overview

DC1369A-D from Analog Devices (formerly Linear Technology) is a demonstration board for the LTC2258-14, a 14-bit, 65Msps ultralow-power analog-to-digital converter. It features 74dB SNR, 88dB SFDR, 0.17psRMS jitter, single 1.8V supply, and configurable CMOS or DDR LVDS outputs - optimized for undersampling IF signals in software-defined radios and portable medical imaging systems.

For engineers reviewing the DC1369A-D datasheet, DC1369A-D pinout, DC1369A-D application, or DC1369A-D equivalent, this page delivers verified hardware configuration details, supported ADC modes (full-rate CMOS, DDR CMOS, DDR LVDS), clock interface options (differential ENC+/ENC–, duty cycle stabilizer), SPI register control, and layout-critical grounding practices for high-frequency sampling integrity.

Technical Context

The DC1369A-D implements the LTC2258-14 in its highest-speed variant (65Msps), with full support for differential analog input (1–2VP-P range), 800MHz full-power bandwidth sample-and-hold, and optional data randomization to reduce spectral spurs. It routes all 14 data bits, OF (overflow), CLKOUT±, and control signals (CS/SCK/SDI/SDO) to accessible headers and test points.

Board-level design includes dedicated 1.8V analog (VDD) and output (OVDD) power domains with low-ESR ceramic bypassing, exposed-pad QFN thermal management, and impedance-controlled DDR LVDS traces. The PAR/SER pin configures serial (SPI) vs. parallel mode operation, enabling both register-level configuration and simplified logic-level control.

Key Specifications

Availability

DC1369A-D is available at Aetrix Electronics and suitable for software-defined radio development, cellular base station prototyping, 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 DC1369A-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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving precision instrumentation, communications, and industrial markets.

The DC1369A-D belongs to Analog Devices' Linear Technology legacy evaluation board family, designed specifically to accelerate time-to-prototype for high-speed, low-power ADC applications in RF and medical signal chains.

FAQ

What is the primary function of the DC1369A-D evaluation board?

The DC1369A-D evaluation board is a fully assembled and tested platform for evaluating the LTC2258-14 14-bit, 65Msps analog-to-digital converter. It provides access to all critical signals - including differential analog inputs, encode clock interfaces, SPI configuration pins, and configurable digital outputs - enabling rapid validation of dynamic performance, timing margins, and system integration in demanding communications and imaging applications. DC1369A-D supports all three output modes: full-rate CMOS, DDR CMOS, and DDR LVDS.

Does the DC1369A-D support both internal and external voltage references?

Yes, the DC1369A-D supports both internal and external reference configurations via the SENSE pin on the LTC2258-14. When SENSE is tied to VDD, the internal 1.25V reference is selected with ±1V input range; when grounded, ±0.5V range is enabled. Applying an external voltage between 0.625V and 1.3V to SENSE selects a proportional ±0.8×[SENSE] input range. The board includes appropriate decoupling (1µF ceramic on VREF) and routing to maintain reference stability per LTC2258-14 specifications.

How is clock input handled on the DC1369A-D for optimal jitter performance?

The DC1369A-D accepts differential clock inputs via ENC+ and ENC– pins (pins 11 and 12), supporting sine wave, PECL, LVDS, TTL, or CMOS drive. It includes an optional clock duty cycle stabilizer (enabled via CS pin) to maintain performance across wide duty-cycle variations. For lowest jitter (0.17psRMS), the board recommends clean, low-noise differential clock sources and proper termination - critical for undersampling IF frequencies up to 140MHz while preserving 74dB SNR and 88dB SFDR as measured on DC1369A-D.

Can the DC1369A-D be used to evaluate the LTC2257-14 or LTC2256-14 as well?

Yes, the DC1369A-D is compatible with pin-compatible members of the LTC225x-14 family: the LTC2257-14 (40Msps) and LTC2256-14 (25Msps). All share identical 40-pin QFN (6mm × 6mm) UJ package, pinout, register map, and functional architecture. Users can substitute these variants without board modification - though maximum sample rate, power consumption (e.g., 49mW at 40Msps), and AC performance (e.g., SNR degradation at higher input frequencies) will scale per device specifications documented for each part.

What are the key layout considerations implemented on the DC1369A-D to preserve ADC performance?

The DC1369A-D implements critical high-speed ADC layout practices: separate analog (VDD/GND) and digital (OVDD/OGND) ground planes joined at a single point near the LTC2258-14 exposed pad; 0.1µF ceramic bypass capacitors placed directly at each VDD/OVDD pin; controlled-impedance DDR LVDS traces; guard rings around analog inputs; and minimized trace lengths for ENC+/ENC– and AIN+/AIN–. These ensure <0.17psRMS jitter, >74dB SNR, and robust 800MHz full-power bandwidth - as verified in DC1369A-D test reports and typical performance curves.