Analog Devices Inc. DC1805A-D

Overview

DC1805A-D from Analog Devices is a demonstration board for the LTC6655LN-2.5 precision voltage reference IC, delivering 2.5V ±0.025% output with 0.12ppm_P-P (0.1Hz–10Hz) noise and 2ppm/°C max drift over –40°C to 125°C. It supports low-noise data acquisition in high-resolution ADC/DAC systems, instrumentation front-ends, and precision battery monitors.

For engineers reviewing the DC1805A-D datasheet, DC1805A-D pinout, DC1805A-D application, or DC1805A-D equivalent, this page provides verified board-level functionality, noise-reduction capacitor integration guidance, thermal hysteresis performance (30ppm, –40°C to 85°C), LS8 package stability data, and direct comparison to alternative evaluation platforms for precision reference validation.

Technical Context

The DC1805A-D implements the LTC6655LN-2.5 in its hermetic 5mm × 5mm LS8 ceramic LCC package, featuring dedicated NR (Noise Reduction) pin support with 100µF capacitor interface, dual ground-star topology at Pin 4, and separate VOUT_F force/sense architecture optimized for <10ppm/mA load regulation. It validates full-temperature-range operation (–40°C to 125°C) and long-term drift of 20ppm/√kHr per LS8 specification.

This board enables measurement of critical low-frequency noise (0.1Hz–10Hz), turn-on settling (<400µs), shutdown current (<20µA), and line regulation (5ppm/V typical) under real-world PCB parasitics and layout constraints - confirming performance claims for automotive sensor signal chains and medical-grade analog front-ends.

Key Specifications

Availability

DC1805A-D is available at Aetrix Electronics and suitable for high-accuracy data acquisition systems, medical diagnostic equipment, and automotive ADAS sensor calibration requiring stable component supply and validated reference performance.

Supply support for DC1805A-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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, communications, automotive, and healthcare markets.

The DC1805A-D belongs to Analog Devices' precision reference evaluation platform family, designed specifically to validate ultra-low-noise, low-drift voltage references in mission-critical measurement applications where thermal stability and long-term repeatability are non-negotiable.

FAQ

What is the primary function of the DC1805A-D evaluation board?

The DC1805A-D evaluation board is a fully assembled and tested platform for characterizing the LTC6655LN-2.5 precision voltage reference IC. It provides immediate access to all pins-including the NR (Noise Reduction) pin-enabling engineers to measure low-frequency noise, thermal hysteresis, load regulation, and startup behavior under real PCB conditions. DC1805A-D uses the LS8 hermetic package to demonstrate industry-leading stability metrics such as 30ppm thermal hysteresis (–40°C to 85°C) and 20ppm/√kHr long-term drift.

Does DC1805A-D support both MSOP and LS8 package variants of the LTC6655LN-2.5?

No. The DC1805A-D is specifically configured for the LTC6655LN-2.5 in the 8-pin LS8 hermetic ceramic LCC (5mm × 5mm) package. It does not support the plastic MSOP variant. The board's layout, grounding scheme, and thermal management are optimized for LS8's superior stability-particularly its zero humidity sensitivity and 30ppm thermal hysteresis over –40°C to 85°C-making DC1805A-D ideal for high-reliability automotive and medical applications where environmental robustness is mandatory.

How is noise reduction implemented on the DC1805A-D board?

Noise reduction on the DC1805A-D is implemented via the LTC6655LN-2.5's dedicated NR (Noise Reduction) pin (Pin 6), which accepts an external capacitor to ground. The board includes footprint and routing for a 100µF capacitor-matching the datasheet-validated configuration that achieves 0.12ppm_P-P (0.1Hz–10Hz) output noise. This implementation directly enables sub-20-bit effective resolution in high-end data acquisition systems, and DC1805A-D allows empirical verification of integrated noise vs. CNR value across 0.1µF to 100µF.

What thermal performance data can be extracted using the DC1805A-D?

Using the DC1805A-D, engineers can extract full-temperature-range performance data for the LTC6655LN-2.5 including output voltage drift (≤2ppm/°C max), thermal hysteresis (30ppm over –40°C to 85°C), and long-term stability (20ppm/√kHr). The board's LS8 package and star-grounded GND layout preserve the reference's intrinsic stability, allowing accurate measurement of hysteresis by cycling between –40°C, 25°C, and 125°C-critical for validating precision sensor signal chains in automotive and aerospace applications.

Can the DC1805A-D be used to evaluate load regulation and line regulation?

Yes. The DC1805A-D supports direct evaluation of both load regulation (<10ppm/mA typical) and line regulation (5ppm/V typical) per LTC6655LN-2.5 specifications. Its VOUT_F and VOUT_S pins (on compatible variants) enable Kelvin sensing, while the board's low-ESR output capacitor (2.7µF–100µF range supported) and clean VIN bypassing (0.1µF) ensure measurement integrity. Engineers can apply controlled current loads up to ±5mA and sweep VIN from 3V to 13.2V to validate performance across operating conditions-essential for precision regulator and battery monitor designs.