Analog Devices Inc. DC1813A-H

Overview

DC1813A-H from Analog Devices (formerly Linear Technology) is an evaluation board designed to demonstrate the DC and AC performance of the LTC2364CMS-18 - an 18-bit, 250ksps pseudo-differential SAR ADC with 96dB SNR, ±2LSB INL max, and operation from a single 2.5V supply. It supports 0V to 5V input range, uses the LTC6655BHMS8-5 reference, and interfaces with DC718/DC590 data collection boards for precision testing in high-fidelity data acquisition systems.

For engineers reviewing the DC1813A-H datasheet, DC1813A-H pinout, DC1813A-H application, or DC1813A-H equivalent, this page delivers verified layout guidance, analog driver configurations (DC/AC-coupled ±10V-to-0–5V), clock jitter sensitivity thresholds (≤15.5MHz max CLK IN), and real-world FFT validation methodology used in-house against LTC2364CMS-18 specifications.

Technical Context

The DC1813A-H implements a complete signal chain for the LTC2364CMS-18, including LT6202-based analog input drivers, LT1763-series regulators (±9V input → 2.5V/1.8V/3.3V rails), and a CPLD-controlled interface. Its layout follows strict high-resolution ADC guidelines: solid ground plane, localized NPO/COG bypassing (C39, C42), symmetrical analog routing, and shielded traces.

It supports three analog input modes via jumpers JP1/J5 (DC/AC coupling), JP2 (VCM = VREF/2), and JP7/JP8 (±3.6V/5V/8V supply configuration). Data output is parallel (0–3.3V or 0–2.5V selectable via JP3), latched on J2 Pin 3, and compatible with logic analyzers or direct application circuit integration.

Key Specifications

Availability

DC1813A-H is available at Aetrix Electronics and suitable for high-precision test equipment, medical imaging front-ends, and seismic data acquisition systems requiring stable component supply, full documentation access, and proven layout reference for 18-bit SAR ADCs.

Supply support for DC1813A-H 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 industrial, automotive, communications, and healthcare markets.

The DC1813A-H belongs to Linear Technology's QuikEval™ demonstration board family, engineered specifically to accelerate evaluation and layout implementation of ultra-low-noise, high-resolution SAR ADCs like the LTC2364CMS-18 in demanding measurement applications.

FAQ

What is the primary ADC device evaluated by the DC1813A-H?

The DC1813A-H evaluates the LTC2364CMS-18 - an 18-bit, 250ksps pseudo-differential successive approximation register (SAR) analog-to-digital converter. This device operates from a single 2.5V supply, achieves 96dB SNR and ±2LSB INL max, and is mounted as U1 on the DC1813A-H board per Table 1 and the DC1813A-H BOM section.

Does the DC1813A-H support both DC and AC analog input coupling?

Yes, the DC1813A-H supports both coupling modes via jumpers JP1 (AIN+) and JP5 (AIN−), with default DC coupling. AC coupling enables use down to ~10kHz (extendable with C17), while DC coupling supports full 0V–5V input range. The board includes three validated driver circuits (Figures 2–4) to maintain linearity and noise performance under either mode.

What clock requirements must be met to achieve specified SNR on the DC1813A-H?

To achieve the rated 96dB SNR, the DC1813A-H requires a low-jitter 3.3V_P-P clock signal ≤15.5MHz applied to J1. The clock is AC-coupled and must be sourced from a high-stability generator (e.g., HP8644 or DC1216A-A); excessive jitter degrades SNR, especially at lower sample rates where dividing higher-frequency clocks is recommended.

Can the DC1813A-H operate without connection to a DC718 or DC590 controller?

Yes - the DC1813A-H provides parallel 18-bit data output at connector J2 (0–3.3V or 0–2.5V selectable via JP3), latched on Pin 3. This allows direct interfacing with logic analyzers, FPGAs, or custom application circuits without QuikEval hardware, enabling standalone integration into end-system prototypes or automated test setups.

How does the DC1813A-H ensure optimal grounding and noise performance for the LTC2364CMS-18?

The DC1813A-H implements a dedicated solid ground plane, places NPO/COG bypass capacitors (C39, C42) within 2mm of ADC supply pins, routes analog inputs symmetrically with ground shielding, and isolates analog/digital power domains using separate LT1763 regulators. These practices directly reflect Linear Technology's layout recommendations for maximizing SNR and minimizing distortion in 18-bit SAR ADC designs.