Analog Devices Inc. DC1678A-A

Overview

DC1678A-A from Analog Devices (formerly Linear Technology) is a demonstration board for the LTC2654 family of quad 16-/12-bit rail-to-rail DACs with integrated 10ppm/°C max reference. It supports both LTC2654-L (2.5V full-scale) and LTC2654-H (4.096V full-scale) variants in 16-lead SSOP and 20-lead QFN packages, features SPI/MICROWIRE-compatible 4-wire interface up to 50MHz, and enables evaluation of monotonicity (±4LSB INL), ultralow crosstalk (<3nV·s), and power-on reset behavior (zero/mid-scale selectable via PORSEL).

For engineers reviewing the DC1678A-A datasheet, DC1678A-A pinout, DC1678A-A application, or DC1678A-A equivalent, this board provides hardware validation of DAC output settling (≤8.9μs for 16-bit), reference flexibility (internal/external), rail-to-rail buffer performance, and multi-channel synchronization - critical for precision instrumentation, industrial process control, and automated test equipment design.

Technical Context

The DC1678A-A implements a complete evaluation platform for the LTC2654 IC, featuring on-board LDO regulation (3.3V/5V), configurable reference selection (1.25V or 2.048V internal, or external up to VCC/2), and independent LDAC/CLR/PORSEL signal access. Its layout maintains controlled impedance traces and dedicated ground planes to preserve <3nV·s DAC-to-DAC crosstalk and ±1mV offset error specifications.

It supports all LTC2654 operating modes: internal reference (2.5V or 4.096V full-scale), external reference (0.5V to VCC/2), and mixed-mode configurations. The board includes test points for all four VOUTA–D outputs, REFIN/OUT, REFCOMP, and digital I/O lines, enabling direct oscilloscope measurement of glitch impulse (≤6nV·s), settling time (≤7.9μs), and noise density (85nV/√Hz at 1kHz).

Key Specifications

Availability

DC1678A-A is available at Aetrix Electronics and suitable for precision instrumentation, industrial automation, and automatic test equipment requiring stable component supply, rapid prototyping validation, and production-ready DAC performance characterization.

Supply support for DC1678A-A 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 semiconductors.

The DC1678A-A belongs to Analog Devices' Linear Technology Evaluation Board product line, designed specifically to accelerate development and validation of precision data converter ICs in industrial, medical, and test & measurement applications.

FAQ

What is the primary function of the DC1678A-A evaluation board?

The DC1678A-A evaluation board is a hardware platform designed exclusively to evaluate the LTC2654 family of quad 16-/12-bit rail-to-rail DACs. It provides full electrical access to all pins, configurable reference options, regulated power supplies, and test points for measuring key performance metrics-including INL (±4LSB), settling time (≤8.9μs), crosstalk (<3nV·s), and power-on reset behavior-ensuring accurate validation of DC1678A-A system integration prior to custom PCB design.

Which LTC2654 variants are supported by the DC1678A-A?

The DC1678A-A supports all standard LTC2654 variants: LTC2654-L16 and LTC2654-H16 (16-bit), as well as LTC2654-L12 and LTC2654-H12 (12-bit), in both 16-lead narrow SSOP (GN) and 20-lead 4mm × 4mm QFN (UF) packages. Jumper settings and onboard circuitry allow seamless configuration for internal reference (2.5V or 4.096V full-scale) or external reference operation, matching the exact specifications of each DC1678A-A-compatible LTC2654 part number.

Does the DC1678A-A provide access to all digital control signals required for full functional testing?

Yes, the DC1678A-A provides direct header access to all critical digital control signals: CS/LD, SCK, SDI, SDO, LDAC, CLR, and PORSEL. These are routed to 0.1"-spaced headers with clear labeling and include series resistors for signal integrity. This enables full SPI protocol validation, asynchronous update testing via LDAC, hardware reset verification via CLR, and power-on reset mode selection using PORSEL - essential for comprehensive DC1678A-A functional qualification.

Can the DC1678A-A be used to measure DAC output noise and glitch performance?

Yes, the DC1678A-A is optimized for high-fidelity analog measurement: it includes low-noise LDOs, dedicated ground planes, and SMA-compatible test points for all four VOUT channels. With proper oscilloscope setup (50Ω termination, bandwidth limit), users can directly measure mid-scale glitch impulse (≤6nV·s for LTC2654-H), output voltage noise density (85nV/√Hz at 1kHz), and 0.1Hz–10Hz noise (≤12μV_P-P), fulfilling critical validation requirements for the DC1678A-A's target applications.

Is external reference support implemented on the DC1678A-A, and how is it configured?

Yes, the DC1678A-A fully supports external reference operation. A dedicated REFEXT header accepts 0.5V to VCC/2 input; REFCOMP is jumpered to GND to disable internal reference at startup; and the "Select External Reference" command (0111b) can be issued via SPI to power down the internal reference. This configuration ensures the DC1678A-A accurately replicates production-level external reference behavior, including load regulation (≤40mV/mA) and input current (<1μA), as specified for the underlying LTC2654 IC.