Analog Devices Inc. DC1678A-D

Overview

DC1678A-D from Analog Devices (formerly Linear Technology) is an evaluation 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 hardware validation of monotonicity, INL (±4LSB), offset error (±2mV), crosstalk (<3nV·s), and power-on reset behavior in precision analog output systems.

For engineers reviewing the DC1678A-D datasheet, DC1678A-D pinout, DC1678A-D application, or DC1678A-D equivalent, this board provides direct access to all four DAC outputs (VOUTA–D), configurable PORSEL/LDAC/CLR control, external reference injection, on-board decoupling, and test points for settling time (≤8.9μs), glitch impulse (≤6nV·s), and noise density (85nV/√Hz at 1kHz) measurements under real-world load conditions.

Technical Context

The DC1678A-D implements a complete signal chain for evaluating LTC2654 DAC performance: it routes all 16/20 pins of the target IC to accessible headers or test points, includes jumpers to select internal/external reference mode, sets PORSEL via DIP switch for zero-scale or mid-scale power-on reset, and provides dedicated LDAC and CLR pushbuttons for asynchronous update and register clear. The board uses 0.1μF ceramic capacitors on VCC, REFIN/OUT, and REFCOMP per datasheet recommendations.

It supports dual supply configurations - 2.7–5.5V for LTC2654-L variants and 4.5–5.5V for LTC2654-H - with GND plane isolation and exposed pad soldering verification for thermal and electrical integrity. All DAC outputs are buffered and routed to SMA connectors or 0.1" headers, enabling direct oscilloscope probing without loading effects.

Key Specifications

Availability

DC1678A-D is available at Aetrix Electronics and suitable for precision instrumentation, industrial process control, automatic test equipment, and automotive calibration systems requiring stable component supply, rapid prototyping validation, and production-ready DAC performance characterization.

Supply support for DC1678A-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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing (DSP) technologies, serving industrial, automotive, communications, and healthcare markets.

The DC1678A-D belongs to ADI's Linear Technology evaluation board portfolio, designed specifically to accelerate design-in and performance validation of precision data converter ICs like the LTC2654 family in mission-critical analog output applications.

FAQ

What is the primary purpose of the DC1678A-D evaluation board?

The DC1678A-D evaluation board is designed exclusively to validate the electrical performance and system integration of the LTC2654 quad DAC family. It enables engineers to measure key parameters including INL (±4LSB), DNL, settling time (≤8.9μs), crosstalk (<3nV·s), and power-on reset behavior under real operating conditions - directly supporting design decisions before committing to custom PCB layout. DC1678A-D does not function as a standalone product but serves as a trusted reference platform for LTC2654 qualification.

Which LTC2654 variants are supported by the DC1678A-D?

The DC1678A-D supports all standard LTC2654 variants: LTC2654-L (2.5V full-scale, 2.7–5.5V supply) and LTC2654-H (4.096V full-scale, 4.5–5.5V supply), in both 16-lead narrow SSOP (GN) and 20-lead 4mm × 4mm QFN (UF) packages. Jumper settings allow selection between internal reference modes (1.25V or 2.048V) or external reference input, matching the exact configuration of the installed LTC2654 device.

How does the DC1678A-D handle power-on reset configuration for the LTC2654?

The DC1678A-D provides a DIP switch to configure the PORSEL pin of the LTC2654 - tying it to GND for zero-scale reset or to VCC for mid-scale reset at power-up. This matches the LTC2654's documented PORSEL functionality and allows users to verify system initialization behavior under both conditions, critical for applications where downstream circuitry must tolerate or require defined DAC output states during startup.

Can the DC1678A-D be used to evaluate DAC crosstalk and glitch performance?

Yes. The DC1678A-D provides direct SMA access to all four DAC outputs (VOUTA–D) and includes dedicated test points for SCK, CS/LD, LDAC, and CLR - enabling precise oscilloscope measurement of dynamic parameters. Users can trigger full-scale transitions on one channel while monitoring induced glitches on others, verifying the specified DAC-to-DAC crosstalk (<3nV·s) and mid-scale glitch impulse (≤6nV·s) per LTC2654 datasheet conditions.

Does the DC1678A-D include provisions for external reference injection?

Yes. The DC1678A-D includes a dedicated header and jumper (JP1) to disconnect the internal reference and route an external reference voltage to the REFIN/OUT pin of the LTC2654. This allows evaluation of full-scale output scaling (2×V_EXTREF) and performance trade-offs such as gain error vs. reference input voltage, as characterized in the LTC2654 datasheet's Typical Performance Characteristics section.