Analog Devices Inc. DC2395A-I

Overview

DC2395A-I from Analog Devices is an evaluation board for the LTC2325-12, a quad 12-bit + sign simultaneous-sampling SAR ADC with differential inputs, 5 Msps/channel throughput, 77 dB SNR at 2.2 MHz, and integrated 4.096 V temperature-compensated reference - designed for high-fidelity data acquisition in multiphase motor control and optical networking systems.

For engineers reviewing the DC2395A-I datasheet, DC2395A-I pinout, DC2395A-I application, or DC2395A-I equivalent, this page delivers verified functional context, precise interface configuration (CMOS/LVDS, SDR/DDR), power sequencing guidance, FPGA-compatible timing alignment via CLKOUT, and layout-critical decoupling requirements for REFOUT pins and exposed pad grounding.

Technical Context

The DC2395A-I implements full-featured signal conditioning and digital interface support for the LTC2325-12, including four independent 8 V_P-P differential analog input paths with ±1 LSB INL, selectable CMOS or LVDS serial I/O, and dual-mode clocking (SDR/DDR) with skew-matched CLKOUT output. It supports both internal 4.096 V reference operation and external reference injection via REFOUT1–4 pins.

Board-level design incorporates low-noise power delivery (separate VDD and OVDD rails), 10 µF X5R ceramic decoupling per REFOUT pin, 1 µF REF bypass, and direct-exposed-pad grounding per LTC2325-12 thermal and EMI requirements. All analog inputs are routed with matched-length differential pairs and guarded ground traces to preserve >102 dB CMRR up to 2.5 MHz.

Key Specifications

Availability

DC2395A-I is available at Aetrix Electronics and suitable for high-speed data acquisition, optical transceiver monitoring, multiphase motor control feedback, and communications baseband processing requiring stable component supply and rapid prototyping validation.

Supply support for DC2395A-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. is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving precision instrumentation, industrial automation, and communications markets.

The DC2395A-I belongs to Analog Devices' Linear Technology evaluation board family, engineered specifically to accelerate system-level validation of high-speed, multi-channel SAR ADCs in noise-sensitive, timing-critical applications.

FAQ

What is the primary function of the DC2395A-I evaluation board?

The DC2395A-I evaluation board is a fully assembled and tested platform for evaluating the LTC2325-12 quad 12-bit + sign simultaneous-sampling SAR ADC. It provides all necessary signal conditioning, power regulation, reference buffering, and configurable digital interface (CMOS/LVDS, SDR/DDR) to validate performance in real-world high-speed acquisition systems. DC2395A-I enables immediate functional testing without custom PCB development.

Does the DC2395A-I support both internal and external reference configurations for the LTC2325-12?

Yes, the DC2395A-I supports both modes. When REFBUFEN is tied to VDD, the board uses the LTC2325-12's internal 4.096 V temperature-compensated reference with 20 ppm/°C drift. When REFBUFEN is grounded, the REFOUT1–4 pins accept external references from 1.25 V to 5 V, enabling system-level reference sharing or higher-precision external sources. DC2395A-I includes appropriate decoupling (10 µF per REFOUT) for either mode.

How is timing synchronization handled between the LTC2325-12 and host FPGA on the DC2395A-I?

The DC2395A-I leverages the LTC2325-12's CLKOUT pin to provide a skew-matched clock synchronized to SCK, ensuring deterministic data capture at the FPGA receiver. CLKOUT is routed with controlled impedance and length-matched to SDO lines. The board supports both SDR (falling-edge sampling) and DDR (dual-edge sampling) modes via the SDR/DDR jumper, and includes CLKOUTEN for optional power reduction when not needed. This eliminates setup/hold uncertainty in DC2395A-I-based designs.

What power supply requirements must be met to operate the DC2395A-I with the LTC2325-12 at full 5 Msps/channel rate?

To operate DC2395A-I at full speed, two clean, low-noise supplies are required: VDD (4.75 V to 5.25 V or 3.13 V to 3.47 V) for the ADC core and REF buffers, and OVDD (1.71 V to 2.63 V) for digital I/O - set to match host interface voltage (e.g., 1.8 V or 2.5 V). DC2395A-I includes onboard 0.1 µF + 10 µF ceramic decoupling per supply pin and requires proper grounding of the exposed thermal pad (Pin 53) to maintain <1 ps RMS aperture jitter and 77 dB SNR as specified for the LTC2325-12.

Can the DC2395A-I be used to evaluate differential input performance up to the full 95 MHz –3dB bandwidth of the LTC2325-12?

Yes, the DC2395A-I maintains controlled-impedance, length-matched differential analog routing for all four AIN+ / AIN– pairs, with guard traces and solid ground planes to preserve signal integrity. Its layout adheres to LTC2325-12's recommended practices for >102 dB CMRR and 95 MHz small-signal bandwidth. For optimal high-frequency evaluation, users must drive inputs with low-output-impedance differential sources and terminate appropriately - DC2395A-I provides SMA connectors and test points to support such measurements.