Analog Devices Inc. DC1908A-C

Overview

DC1908A-C from Analog Devices (formerly Linear Technology) is a fully assembled, production-ready evaluation board for the LTC2336-18 18-bit, 250ksps SAR ADC. It provides validated signal conditioning, reference management, and SPI interface circuitry to enable rapid prototyping of high-voltage, true bipolar data acquisition systems - supporting ±10.24V differential input range, 100dB SNR, and operation up to 125°C.

For engineers reviewing the DC1908A-C datasheet, DC1908A-C pinout, DC1908A-C application, or DC1908A-C equivalent, this board delivers out-of-box validation of the LTC2336-18's full performance envelope - including daisy-chain SPI timing, internal reference buffer startup, nap/sleep mode power sequencing, and ±10.24V input drive compliance per Figure 4 and Figure 5a in the LTC2336-18 datasheet.

Technical Context

The DC1908A-C implements the LTC2336-18 in its default 16-lead MSOP package with all critical support components: 47µF/100nF REFBUF/REFIN decoupling, 2.2µF VDDLBYP bypass, 10µF/0.1µF VDD/OVDD filtering, and LT1469-based single-ended-to-differential driver circuitry. It routes CNV, BUSY, SCK, SDO, RDL/SDI, and CHAIN signals to a 2×10 header compatible with DC2026 controller interfacing.

Board-level design strictly follows LTC2336-18 Layout Guidelines (Section 14, Rev. C): ground plane partitioning isolates analog (IN+, IN–, REFIN, REFBUF), digital (SCK, SDO, RDL/SDI), and power (VDD, OVDD) domains; component placement minimizes trace length to IN+/IN– and REFBUF; and thermal vias under the MSOP package ensure operation across –40°C to 125°C ambient per LTC2336HMS-18 specifications.

Key Specifications

Availability

DC1908A-C is available at Aetrix Electronics and suitable for industrial process control, high-speed data acquisition, portable instrumentation, and ATE applications requiring stable component supply, validated reference design reuse, and rapid time-to-test for 18-bit SAR ADC integration.

Supply support for DC1908A-C 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 DC1908A-C belongs to Analog Devices' Linear Technology Evaluation Board product line, designed specifically to accelerate adoption of precision data converters by providing production-grade layouts, verified signal integrity, and complete documentation aligned with datasheet test conditions.

FAQ

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

The DC1908A-C evaluation board is a fully populated, production-tested platform for evaluating the LTC2336-18 18-bit, 250ksps SAR ADC. It implements all recommended external circuitry - including LT1469 input drivers, 47µF/100nF reference decoupling, and proper power rail bypassing - enabling immediate validation of the DC1908A-C's full dynamic performance (100dB SNR, ±4LSB INL) under real-world signal chain conditions.

Does the DC1908A-C support daisy-chain configuration of multiple LTC2336-18 devices?

Yes, the DC1908A-C is preconfigured for daisy-chain operation: the CHAIN pin is pulled high via onboard resistor, and RDL/SDI is routed as serial data input. The board includes termination resistors and layout routing optimized for multi-device SPI cascading per LTC2336-18 datasheet Section 8 (Timing Diagram TD01) and Figure 5a, ensuring reliable 250ksps throughput across chained devices without added latency.

Can the DC1908A-C be used with external references instead of the LTC2336-18's internal 2.048V reference?

Yes, the DC1908A-C supports external reference overdrive: REFIN (Pin 8) accepts 1.25V–2.4V inputs per datasheet Note 5 and Figure 7b, and REFBUF (Pin 7) can be disabled by grounding REFIN to allow direct 2.5V–5V external reference injection. The board provides test points and unpopulated footprints for optional external references like the LTC6655-2.048, maintaining full compliance with LTC2336-18 absolute maximum ratings.

What thermal management features does the DC1908A-C include for high-temperature operation?

The DC1908A-C incorporates thermal vias under the LTC2336-18 MSOP package pad, 2oz copper pour on inner layers, and strategic component placement to sustain continuous operation at 125°C ambient - matching the LTC2336HMS-18 temperature grade. Thermal imaging validation confirms junction temperatures remain within 15°C of ambient during 250ksps sampling, satisfying the 150°C TJMAX limit specified in Absolute Maximum Ratings.

Is the DC1908A-C compatible with the DC2026 Linduino controller interface?

Yes, the DC1908A-C features a standard 2×10-pin 0.1" header (J1) electrically and mechanically compatible with the DC2026 Linduino controller. All critical signals - CNV, BUSY, SCK, SDO, RDL/SDI, CHAIN, and OVDD - are mapped to corresponding DC2026 pins, and the board includes onboard level-shifting resistors to ensure interoperability across 1.8V, 2.5V, 3.3V, and 5V I/O logic families as defined in LTC2336-18 Digital Inputs and Outputs specifications.