Analog Devices Inc. DC416A

Overview

DC416A from Analog Devices (formerly Linear Technology) is an evaluation board for the LTC1864 16-bit, 250ksps, single-channel differential analog-to-digital converter in MSOP-8 package. It operates from a single 5V supply, draws only 850μA at full speed, and supports ratiometric or external reference configurations. The board enables high-accuracy data acquisition in portable instrumentation and isolated sensor interfaces.

For engineers reviewing the DC416A datasheet, DC416A pinout, DC416A application, or DC416A equivalent, this page provides verified functional context, layout-critical grounding and bypassing guidance, serial interface timing validation, and direct mapping to LTC1864CMS8 operation - essential for low-noise analog design, battery-powered system integration, and SPI-compatible embedded ADC deployment.

Technical Context

The DC416A implements the LTC1864CMS8 in a fully laid-out, ground-isolated PCB with dedicated analog and digital planes. It incorporates precision bypassing (1μF tantalum on VCC/VREF), low-inductance grounding, and Manchester-coded serial transmission/reception circuitry using LTC1485 transceivers and 74AC logic.

It validates key LTC1864 behaviors: auto-shutdown between conversions (reducing current to 2μA at 1ksps), true differential input sampling with 125kHz full linear bandwidth, and 87dB SNR performance. The board's JP1–JP9 jumpers allow configuration of input range, reference source, clock generation, and serial data format.

Key Specifications

Availability

DC416A is available at Aetrix Electronics and suitable for portable instrumentation, isolated sensor interfaces, and low-power battery-operated data loggers requiring stable component supply and validated signal-chain layout practices.

Supply support for DC416A 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.

The DC416A belongs to Linear Technology's legacy evaluation board portfolio, specifically designed to demonstrate optimal implementation of their precision ADCs - emphasizing noise-sensitive layout, power integrity, and real-world timing compliance for embedded measurement systems.

FAQ

What is the primary function of the DC416A evaluation board?

The DC416A evaluation board is a fully assembled and tested platform for evaluating the LTC1864CMS8 16-bit, 250ksps analog-to-digital converter. It provides validated PCB layout, precision bypassing, isolated grounding, and optional Manchester coding circuitry to demonstrate real-world performance - including 87dB SNR, 2μA sleep current, and differential input rejection - without requiring custom prototyping.

Which specific LTC1864 variant does the DC416A support?

The DC416A is configured for the LTC1864CMS8 - the commercial-grade (0°C to 70°C), lead-free, 8-lead MSOP package version of the LTC1864. Its silkscreen, footprint, and JP1–JP9 jumper settings align precisely with the LTC1864CMS8 pinout and recommended operating conditions, including VCC = 5V, VREF = 5V, and fSCK ≤ 20MHz.

Does the DC416A support the LTC1865 or other family members?

No, the DC416A is designed exclusively for the single-channel LTC1864. It lacks the SDI input, CH0/CH1 multiplexer routing, and 10-lead MSOP footprint required for the LTC1865. Attempting to substitute an LTC1865 on the DC416A will result in incorrect pin connections and nonfunctional operation due to incompatible pin count, pin functions, and MUX control requirements.

How does the DC416A handle analog and digital ground separation?

The DC416A uses a split ground plane architecture: a dedicated analog ground plane under the LTC1864CMS8 and front-end components, and a separate digital ground plane for logic and clock circuitry. These are joined at a single point near the power entry - as specified in the board's AI1 layout documentation - to prevent digital switching noise from modulating the ADC's reference or analog inputs, preserving its 87dB SNR specification.

Can the DC416A be used with external reference voltages below 5V?

Yes, the DC416A supports external reference voltages from 1V to 5V via the VREF test point and JP2 jumper configuration. When using VREF < 5V, the board maintains full 16-bit resolution and linearity (±8 LSB INL) as long as the analog input span (IN+ – IN–) remains within 0V to VREF, and proper bypassing (1μF tantalum) is maintained - enabling direct interfacing with low-voltage sensors without gain stages.