Analog Devices Inc. DC1796A-C

Overview

DC1796A-C from Analog Devices (formerly Linear Technology) is a fully assembled, RoHS-compliant evaluation board for the LTC2367-16 16-bit, 500ksps pseudo-differential unipolar SAR ADC. It enables rapid characterization of dynamic performance (94.7dB SNR, ±0.75LSB INL), low-power operation (6.8mW at full rate), and SPI-compatible serial interface behavior under real-world signal chain conditions - including reference decoupling, input drive, and daisy-chain timing validation.

For engineers reviewing the DC1796A-C datasheet, DC1796A-C pinout, DC1796A-C application, or DC1796A-C equivalent, this board provides verified hardware implementation of the LTC2367-16 in both MSOP and DFN package variants, with on-board LT6202 driver, LTC6655-5 reference, and configurable analog input filtering - supporting immediate lab validation of high-speed data acquisition systems requiring <100dB SFDR and sub-1µs transient response.

Technical Context

The DC1796A-C implements the LTC2367-16 in its 16-lead MSOP package (LTC2367CMS-16#PBF) and supports all key operational modes: normal SPI readout, daisy-chain configuration via CHAIN/RDL/SDI pins, and burst sampling with precise CNV timing control. It integrates a 5V LTC6655-5 reference (0.025% initial accuracy, 2ppm/°C drift) and LT6202 unity-gain buffer (1.9nV/√Hz noise, 3mA supply current) to maintain ≤0.5LSB reference deviation across full code span at 500ksps.

Board-level design validates critical layout practices: dedicated 47µF X5R ceramic REF decoupling at Pin 7/8, 10µF VDD bypassing, 0.1µF OVDD filtering, exposed-pad GND soldering for DFN variant compatibility, and RC anti-aliasing networks (LPF1: 48kHz, LPF2: 1.6MHz) that preserve >94dB SNR while suppressing external noise coupling into the 34MHz –3dB input bandwidth.

Key Specifications

Availability

DC1796A-C is available at Aetrix Electronics and suitable for high-speed data acquisition, portable instrumentation, industrial process control, and medical imaging applications requiring stable component supply, traceable evaluation hardware, and validated signal chain performance.

Supply support for DC1796A-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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving precision measurement, communications, and industrial markets.

The DC1796A-C belongs to ADI's Linear Technology Evaluation Board product line, designed specifically to accelerate prototyping and validation of high-resolution, low-noise data converters in demanding real-world environments - with emphasis on layout integrity, reference stability, and interface timing fidelity.

FAQ

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

The DC1796A-C evaluation board is a ready-to-use hardware platform for evaluating the LTC2367-16 16-bit SAR ADC. It provides complete signal conditioning - including LT6202 input buffering, LTC6655-5 precision reference, and dual-stage RC filtering - enabling engineers to measure actual dynamic performance (94.7dB SNR, –119dB THD) and validate SPI interface timing without custom PCB development. The DC1796A-C supports both single-conversion and burst-mode operation with precise CNV edge control.

Does the DC1796A-C support daisy-chain configuration of multiple LTC2367-16 ADCs?

Yes, the DC1796A-C fully supports daisy-chain mode for the LTC2367-16. The CHAIN pin (Pin 1) is accessible and routed to a header, allowing direct logic-level control to enable chain mode. In this configuration, RDL/SDI functions as serial data input, enabling synchronized multi-ADC sampling and compact SPI bus utilization. Timing parameters such as tSCKCH (13.5ns minimum SCK period in chain mode) and tDSDO (9.5ns SDO delay) are preserved per the LTC2367-16 datasheet specifications implemented on the DC1796A-C.

Which reference voltage source is used on the DC1796A-C, and why is it critical for LTC2367-16 performance?

The DC1796A-C uses the LTC6655-5 precision voltage reference (5.000V output). This device delivers 0.025% maximum initial accuracy and 2ppm/°C temperature coefficient - matching the LTC2367-16's H-grade extended temperature capability up to 125°C. Its fast settling and low noise ensure reference deviation remains below 0.5LSB across the full 65,536-code range at 500ksps, directly enabling the DC1796A-C to achieve the datasheet's guaranteed 94.7dB SNR and ±0.75LSB INL for the LTC2367-16.

Can the DC1796A-C be used to evaluate both MSOP and DFN package versions of the LTC2367-16?

The DC1796A-C is factory-configured for the LTC2367CMS-16 (16-lead MSOP) variant, as indicated by the populated footprint and silk-screened part marking. While the board layout accommodates the pin-compatible DFN package (LTC2367CDE-16), no DFN socket or solder pads are provided - meaning direct DFN evaluation requires rework or custom adapter. All documented performance metrics (SNR, THD, timing) on the DC1796A-C datasheet apply exclusively to the MSOP-based LTC2367CMS-16 installed on the board.

What analog input filtering is implemented on the DC1796A-C, and how does it affect LTC2367-16 performance?

The DC1796A-C implements two cascaded RC filters: LPF1 (48kHz cutoff before the LT6202 buffer) suppresses broadband noise upstream, while LPF2 (1.6MHz cutoff between LT6202 and LTC2367-16) minimizes buffer noise contribution and isolates sampling transients. This dual-stage approach preserves the LTC2367-16's 34MHz –3dB input bandwidth and ensures measured SNR remains ≥94.7dB - validated using 32k-point FFT at f_IN = 2kHz. Component selection (NPO capacitors, metal-film resistors) avoids distortion-induced degradation.