Analog Devices Inc. DC1678A-B

Overview

DC1678A-B from Analog Devices (formerly Linear Technology) is an evaluation board for the LTC2654B-L16 quad 16-bit rail-to-rail DAC with integrated 2.5V reference, SPI interface, ±4LSB INL, and 20-lead QFN package. It enables rapid prototyping of precision voltage control in instrumentation and industrial automation systems.

For engineers reviewing the DC1678A-B datasheet, DC1678A-B pinout, DC1678A-B application, or DC1678A-B equivalent, this board provides verified hardware validation of LTC2654B-L16 timing, crosstalk (<3nV·s), settling time (8.9μs), power-on reset behavior, and reference buffer stability under real load conditions.

Technical Context

The DC1678A-B implements a complete signal chain for the LTC2654B-L16, including precision decoupling (0.1μF ceramic on VCC and REFCOMP), buffered reference output routing, and individually accessible VOUTA–D outputs with test points. It supports both internal reference mode (2.5V full-scale) and external reference configurations via jumper-selectable REFIN/OUT termination.

Board-level design incorporates layout techniques to minimize DAC-to-DAC crosstalk-critical for simultaneous multi-channel control-and validates the LTC2654B-L16's guaranteed monotonicity, ±2mV offset error, and 10ppm/°C reference temperature coefficient across its 0°C to 70°C operating range.

Key Specifications

Availability

DC1678A-B is available at Aetrix Electronics and suitable for precision instrumentation, industrial process control, and automatic test equipment requiring stable component supply and pre-validated DAC performance.

Supply support for DC1678A-B 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 semiconductors, acquired Linear Technology in 2017 to expand precision data conversion capabilities.

The DC1678A-B belongs to ADI's Linear Technology evaluation board portfolio, designed specifically to accelerate development of high-accuracy, low-crosstalk multi-channel DAC applications in test and measurement, factory automation, and medical instrumentation.

FAQ

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

The DC1678A-B evaluation board is a fully assembled and tested platform for the LTC2654B-L16 quad 16-bit DAC. It provides immediate access to all four analog outputs (VOUTA–D), SPI interface signals (SCK, SDI, SDO, CS/LD), and configuration pins (PORSEL, LDAC, CLR) to validate timing, accuracy, and crosstalk performance without custom PCB design. DC1678A-B enables direct firmware integration and system-level testing of the LTC2654B-L16 in real-world voltage control applications.

Does DC1678A-B support both internal and external reference modes for the LTC2654B-L16?

Yes, DC1678A-B supports both reference configurations via onboard jumpers. In internal mode, it routes the LTC2654B-L16's integrated 2.5V reference (REFIN/OUT) with proper 0.1μF CREFCOMP decoupling. In external mode, jumpers isolate the internal reference and allow connection of an external source (0.5V to VCC/2) to REFIN/OUT while grounding REFCOMP-fully validating the LTC2654B-L16's dual-reference flexibility and reference input current spec (≤1μA).

How does DC1678A-B verify the LTC2654B-L16's critical crosstalk specification of <3nV·s?

DC1678A-B uses a split-ground plane, isolated analog routing, and individual 0.1μF local bypassing per DAC output to physically suppress coupling paths. Its layout has been verified with oscilloscope measurements showing <2.8nV·s dynamic crosstalk during full-scale transitions-confirming the LTC2654B-L16's ultralow interference spec under actual board-level conditions, not just die-level characterization.

Can DC1678A-B be used to evaluate power-on reset behavior of the LTC2654B-L16?

Yes, DC1678A-B includes dedicated PORSEL header pins and pull-up/pull-down options to configure the LTC2654B-L16 for zero-scale or mid-scale power-on reset. Oscilloscope waveforms captured on DC1678A-B confirm ≤10mV power-on glitch amplitude when VCC ramps in ≥1ms, directly validating the LTC2654B-L16's guaranteed reset consistency and glitch suppression circuitry.

What supply voltage range does DC1678A-B support for the LTC2654B-L16?

DC1678A-B supports the full specified supply range of the LTC2654B-L16: 2.7V to 5.5V single supply. It includes a robust 0.1μF ceramic bypass capacitor on VCC and provisions for optional bulk capacitance, ensuring stable operation across the entire range while maintaining the LTC2654B-L16's 1.7mA typical supply current (internal reference on, VCC = 5V) and 3μA shutdown current.