Analog Devices Inc. DC1813A-C

Overview

DC1813A-C 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 ADCs, precision instrumentation, and automotive sensor signal conditioning.

For engineers reviewing the DC1813A-C datasheet, DC1813A-C pinout, DC1813A-C application, or DC1813A-C equivalent, this board enables rapid validation of LTC6655LN-2.5 performance-including NR-pin noise filtering, load regulation under ±5mA, shutdown current <20µA, and stability with 2.7µF–100µF output capacitors-on a fully tested, production-ready layout.

Technical Context

The DC1813A-C implements the LTC6655LN-2.5 in an 8-lead MSOP package with dedicated NR (Noise Reduction) pin routed to a test point and configurable capacitor pads (0.1µF to 100µF). It incorporates separate VOUT_F and GND planes optimized for low-noise measurement, star-grounded at Pin 4 per datasheet guidance.

Board-level design includes 0.1µF CIN near VIN, selectable output capacitor footprints (2.7µF, 10µF, 100µF X7R), and SHDN pull-up resistor enabling clean shutdown control. All critical traces are wide and short to minimize parasitic inductance and thermal EMF errors.

Key Specifications

Availability

DC1813A-C is available at Aetrix Electronics and suitable for precision instrumentation, high-resolution data acquisition systems, and automotive sensor calibration requiring stable component supply and verified reference performance.

Supply support for DC1813A-C 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 precision measurement, industrial automation, and communications markets.

The DC1813A-C belongs to Analog Devices' Precision Demonstration Board family, designed to accelerate evaluation and prototyping of ultra-stable voltage references in metrology-grade applications.

FAQ

What is the primary function of the DC1813A-C evaluation board?

The DC1813A-C evaluation board is a fully assembled and tested platform for characterizing the LTC6655LN-2.5 ultra-low-noise voltage reference IC. It provides immediate access to all pins-including NR, SHDN, VOUT_F, and GND-with optimized layout, decoupling, and capacitor options to validate noise, drift, load regulation, and shutdown behavior per the datasheet. Engineers use DC1813A-C to de-risk reference selection before final PCB integration.

Does the DC1813A-C support both LTC6655 and LTC6655LN variants?

No-the DC1813A-C is specifically configured for the LTC6655LN-2.5 variant, which includes the Noise Reduction (NR) pin. The board features dedicated test points and capacitor footprints (0.1µF to 100µF) for NR filtering, and its schematic matches the LTC6655LN pinout (Pin 6 = NR, not VOUT_S). It does not support standard LTC6655-2.5 operation without hardware modification.

How is the NR (Noise Reduction) pin implemented on the DC1813A-C?

The DC1813A-C routes the NR pin (Pin 6 of LTC6655LN-2.5) to a dedicated test point and provides three parallel capacitor footprints (0.1µF, 10µF, 100µF) with zero-ohm jumper options. This allows direct comparison of integrated noise reduction across bandwidths-e.g., 0.12ppm_P-P (0.1Hz–10Hz) with 100µF-without soldering changes. The board's ground plane is star-connected at Pin 4 to preserve NR effectiveness.

What output capacitor values are validated on the DC1813A-C?

The DC1813A-C includes validated footprints for 2.7µF, 10µF, and 100µF X7R ceramic output capacitors, each with low-ESR (<0.1Ω) design compliance. These match the recommended range in the LTC6655LN datasheet and enable empirical assessment of turn-on time (e.g., ~400µs with 2.7µF), noise peaking, and stability-critical for ADC reference design where capacitor choice directly impacts effective resolution.

Can the DC1813A-C be used for long-term drift or thermal hysteresis testing?

Yes-the DC1813A-C uses the same 8-lead MSOP packaging and grounding architecture as production LTC6655LN-2.5 units, and its layout minimizes thermal gradients. It supports full-temperature-range validation (–40°C to 125°C) per datasheet specs, including thermal hysteresis (30ppm for LS8, but MSOP-tested per characterization curves) and long-term drift (20ppm/√kHr for LS8, referenced in context of hermetic stability benchmarks). Board-level measurements align with IC-level guarantees when environmental controls are applied.