Analog Devices Inc. DC1908A-I

Overview

DC1908A-I from Analog Devices (formerly Linear Technology) is a fully assembled, RoHS-compliant evaluation board for the LTC2326-16 16-bit, 250ksps pseudo-differential SAR ADC. It supports ±10.24V true bipolar input range, delivers 93.5dB SNR and ±1.5LSB INL max, and enables rapid validation of high-speed data acquisition in industrial process control and ATE systems.

For engineers reviewing the DC1908A-I datasheet, DC1908A-I pinout, DC1908A-I application, or DC1908A-I equivalent, this board provides verified signal chain implementation-including LT1468 ADC driver, precision reference buffering, daisy-chain SPI interface, and thermal-aware layout-enabling immediate functional testing without custom PCB development.

Technical Context

The DC1908A-I implements the LTC2326-16 in its 16-lead MSOP package with full support for all three reference configurations: internal 2.048V bandgap + 2× buffer (±10.24V range), external overdrive of REFIN (e.g., LTC6655-2.048), or direct REFBUF overdrive (±6.25V to ±12.5V). It integrates dedicated low-noise power conditioning: 5V VDD bypassed with 10µF + 2.2µF ceramics, OVDD decoupled with 0.1µF, and REFBUF stabilized with 47µF X7R ceramic.

All digital I/O operates at 1.8V–5V logic levels via configurable OVDD, and the board supports both normal SPI mode (RDL/SDI as bus enable) and daisy-chain mode (CHAIN = HIGH, RDL/SDI as SDI). The CNV-triggered conversion timing, BUSY indicator, and SDO/SCK routing are laid out to minimize skew and maintain <4ps RMS aperture jitter performance per LTC2326-16 specifications.

Key Specifications

Availability

DC1908A-I is available at Aetrix Electronics and suitable for industrial process control, automated test equipment (ATE), and high-speed data acquisition requiring stable component supply, traceable evaluation hardware, and documented signal chain performance.

Supply support for DC1908A-I 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 technologies, serving industrial, automotive, communications, and healthcare markets.

The DC1908A-I belongs to ADI's Linear Technology Evaluation Board family, designed to accelerate prototyping and validation of precision data converters-including SAR ADCs like the LTC2326-16-by providing production-grade layout, calibrated reference paths, and interoperable interface options.

FAQ

What is the primary function of the DC1908A-I evaluation board?

The DC1908A-I evaluation board is a ready-to-use platform for evaluating the LTC2326-16 16-bit, 250ksps pseudo-differential SAR ADC. It provides complete signal conditioning-including LT1468 driver, reference buffering, and SPI interface circuitry-enabling engineers to validate dynamic performance (e.g., 93.5dB SNR, ±1.5LSB INL) and interface behavior without custom design. DC1908A-I supports all three reference configurations and operates across the full –40°C to 125°C temperature range of the LTC2326-16H variant.

Does the DC1908A-I support daisy-chain operation for multiple LTC2326-16 devices?

Yes, the DC1908A-I supports daisy-chain mode via the CHAIN jumper and associated RDL/SDI routing. When CHAIN is set HIGH, the board configures the LTC2326-16 to accept serial data input on RDL/SDI and shift out results on SDO in cascaded fashion. The board's layout maintains signal integrity for high-speed SCK (up to 100MHz) and includes termination options to suppress reflections in multi-node chains. DC1908A-I documentation confirms compatibility with the LTC2326-16's tSCKCH = 13.5ns minimum clock period in chain mode.

Can the DC1908A-I be used with external references other than the internal 2.048V source?

Yes, the DC1908A-I provides hardware flexibility for all three LTC2326-16 reference modes: (1) internal 2.048V bandgap + 2× buffer (default ±10.24V), (2) external overdrive of REFIN (e.g., LTC6655-2.048, enabling ±6.25V to ±12.5V ranges), and (3) direct REFBUF overdrive (2.5V–5V). Jumper-selectable connections and test points allow clean injection of external references while maintaining proper decoupling (100nF at REFIN, 47µF at REFBUF) per datasheet requirements. DC1908A-I supports the full 1.25V–2.4V REFIN overdrive range and 2.5V–5V REFBUF overdrive range.

What power supply requirements does the DC1908A-I have?

The DC1908A-I requires two independent supplies: a 5V source for VDD (4.75V–5.25V, bypassed with 10µF + 2.2µF ceramics) and a separately configurable OVDD supply (1.71V–5.25V) for digital I/O logic levels. The board includes onboard regulators and filtering to meet LTC2326-16 absolute maximum ratings and ensure stable 28mW typical power dissipation at 250ksps. DC1908A-I also supports sleep mode (300μW) via software-controlled CNV sequencing, with documented wake-up timing (tWAKE = 200ms with 47µF REFBUF cap).

Is thermal management addressed on the DC1908A-I board?

Yes, the DC1908A-I incorporates thermal-aware layout practices aligned with LTC2326-16's 125°C H-grade operation. It features solid internal GND planes for heat spreading, thermal reliefs on all GND pads (Pins 3, 6, 16), and copper pours tied to GND under the MSOP package. The board's θJA is optimized to support continuous 250ksps operation at elevated ambient temperatures, and thermal performance is validated per LTC2326-16's TJMAX = 150°C specification. DC1908A-I documentation includes measured junction temperature rise data under full-load conditions.