1. Overview

️· Purpose: This document describes the DC2094A demonstration board, designed for engineering development or evaluation purposes of the LTC2348 Analog-to-Digital Converter (ADC). It's *not* intended for commercial use.
️· Limitations: The board is a prototype and may not be fully compliant with regulatory standards.
️· Safety: Users are responsible for handling the board safely and following good laboratory practices. ESD precautions are critical.

2. Hardware Details

️· ADC: The board demonstrates the LTC2348 ADC.
️· Jumpers & Connectors:
- JP1 (REF): Selects internal or external reference voltage for the ADC. (Default: Internal)
- JP2 (VCCIO): Sets output levels for the interface (Default: 2.5V, compatible with DC890)
- P1: Interface for connection to DC890 controller.
- J1 (CLK): Provides the ADC clock signal.
- J2, J3, J4: Reserved for factory use.
- JP4 (EEPROM): Reserved for factory use.
- JP6-JP12: Allows shorting AIN inputs to ground or driving them with external signals.
- J5 & J6: Input analog voltages to ADC channels.
- J7: Routes analog signals to specific ADC channels.
️· Layout Considerations: Ground plane is necessary. Bypass capacitors should be close to power pins, with low-impedance returns. Symmetrical layout around analog inputs minimizes parasitic effects. Shield analog traces with ground.

3. Software/Data Acquisition

️· DC890/QuikEval: The board interfaces with either the DC890 controller for data acquisition and evaluation (using PScope software) or the DC590/DC2026 for slower measurements (using QuikEval).
️· PScope Software: Used with the DC890 to configure the LTC2348, change input ranges, and view data. A "Set Demo Bd Options" button allows quick configuration. Windowing in FFT analysis can reduce leakage if ADC input frequency is a sub-multiple of the sample rate.
️· QuikEval Software: Used with DC590/DC2026. Limited to slower measurements and data collection.
️· Important Note: PScope calculations of SNR may need correction to account for signal level adjustments.

4. Important Notices

️· Disclaimer: Linear Technology provides the board "AS IS" and makes no warranty.
️· Liability: Users assume all responsibility for safe handling and are released from liability to Linear Technology.
️· Regulatory Compliance: Board is not necessarily compliant with regulatory standards (FCC, UL, CE, etc.).
️· Patent Rights: No patent rights are granted.
️· Non-Exclusive: LTC serves multiple customers and the transaction is not exclusive.

5. Key Takeaways

️· Educational Tool: This board is an excellent resource for learning about ADC evaluation and circuit design.
️· Careful Handling: Adhere to safety guidelines and precautions when handling the board.
️· Software Familiarity: Become familiar with both PScope and QuikEval for data acquisition and analysis.
️· Limitations: Understand the limitations of the board – it is a prototype and not intended for production.
️· Read the Manual: Carefully review the entire manual before using the board.