Analog Devices Inc. DC1796A-G

Overview

DC1796A-G from Analog Devices (formerly Linear Technology) is a fully assembled, RoHS-compliant demonstration board for the LTC2367-18 18-bit, 500ksps pseudo-differential SAR ADC. It enables rapid evaluation of DC and AC performance-including 97dB SNR, ±2.5LSB INL max, and no missing codes-at full throughput with minimal external components. The board supports VREF from 2.5V to 5.1V and operates across –40°C to 85°C.

For engineers reviewing the DC1796A-G datasheet, DC1796A-G pinout, DC1796A-G application, or DC1796A-G equivalent, this board provides validated signal chain layout, calibrated reference path (LTC6655-5), low-noise LT6202 input driver, and SPI interface support for daisy-chain configuration-critical for high-fidelity data acquisition system prototyping.

Technical Context

The DC1796A-G implements the LTC2367-18 in its 16-lead DFN (4mm × 3mm) package with exposed pad grounded, using a precision 5V LTC6655-5 reference and LT6202 unity-gain buffer to achieve guaranteed 97dB SNR and –120dB THD at 2kHz. All analog routing follows strict controlled-impedance, ground-isolated practices per Linear's layout guidelines.

It features on-board jumpers for CNV clock source selection (external TTL or internal oscillator), REF voltage scaling (2.5V/5V), and RDL/SDI mode control (normal vs. daisy-chain). Power is supplied via USB (5V) with local LDO regulation to 2.5V (VDD) and selectable 1.8V/2.5V/3.3V/5V (OVDD), enabling direct interfacing with FPGA, MCU, or PC-based controllers.

Key Specifications

Availability

DC1796A-G is available at Aetrix Electronics and suitable for high-speed data acquisition, portable instrumentation, industrial process control, and medical imaging systems requiring stable component supply, traceable evaluation hardware, and production-ready signal chain validation.

Supply support for DC1796A-G 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. (acquiring Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors for precision measurement and signal conditioning.

The DC1796A-G belongs to Analog Devices' Signal Chain Evaluation Platform family, designed to accelerate development of high-fidelity data acquisition systems by providing production-grade layouts, calibrated references, and verified driver circuits for flagship precision ADCs like the LTC2367-18.

FAQ

What is the primary function of the DC1796A-G evaluation board?

The DC1796A-G evaluation board is a ready-to-use hardware platform for evaluating the LTC2367-18 18-bit, 500ksps pseudo-differential SAR ADC. It integrates all critical support circuitry-including the LTC6655-5 reference, LT6202 input driver, proper decoupling, and SPI interface headers-enabling immediate AC/DC performance validation without custom PCB design. The DC1796A-G delivers measured 97dB SNR and ±2.5LSB INL as specified in the LTC2367-18 datasheet.

Does the DC1796A-G support daisy-chain configuration of multiple LTC2367-18 ADCs?

Yes, the DC1796A-G supports daisy-chain operation via its configurable CHAIN pin and RDL/SDI header. When CHAIN is asserted high, the board operates in chain mode, allowing serial data from up to four LTC2367-18 devices to be read back through a single SPI bus. The DC1796A-G's layout and firmware-ready pinout comply with LTC2367-18 timing requirements for tSCKCH (13.5ns minimum) and tDSDO (9.5ns).

What reference voltage options are available on the DC1796A-G for the LTC2367-18?

The DC1796A-G provides two factory-configured reference options: a precision 5V LTC6655-5 (default) and a jumper-selectable 2.5V mode. Both meet the LTC2367-18's VREF specification of 2.5V to 5.1V and include dedicated 47µF X5R ceramic decoupling per Linear's layout recommendations. The DC1796A-G's reference path is isolated from digital noise and validated to maintain <0.5LSB deviation across the full code span.

Can the DC1796A-G operate from a USB power source alone?

Yes, the DC1796A-G is powered exclusively via its micro-USB port (5V), which feeds onboard regulators generating the required 2.5V (VDD) and user-selectable OVDD (1.8V/2.5V/3.3V/5V). No external power supplies are needed for basic operation. The DC1796A-G's power architecture ensures clean, low-noise rails meeting LTC2367-18's IVDD (3.2mA typ) and IOVDD (0.1mA typ) specifications at 500ksps.

Is the DC1796A-G compatible with the LTC2367-18's extended temperature grade (H-grade, –40°C to 125°C)?

No-the DC1796A-G is rated for operation from –40°C to +85°C, matching the I-grade LTC2367-18 variants (e.g., LTC2367IDE-18). While the LTC2367-18 H-grade part itself supports 125°C junction temperature, the DC1796A-G's passive components (capacitors, resistors, connectors) and layout are not qualified beyond 85°C ambient. For 125°C applications, users must validate thermal derating and component selection independently. The DC1796A-G does not ship with H-grade LTC2367-18 devices.