LTC1404CS8#TRPBF

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The LTC1404CS8#TRPBF (LTC1404) is a high-performance, dual 8-bit analog-to-digital converter (ADC) designed for use in a variety of signal processing and data acquisition applications. The device features an 8-bit accuracy and a high signal-to-noise ratio with a sampling rate of up to 18 Msps. It features various features, such as fast settling, precise reject and auto-offset calibration and a powerful software library. In this article, we will explore the application field and working principles of the LTC1404.

Application Fields

The LTC1404 is a dual-channel ADC which enables it to handle both single-ended and differential inputs simultaneously. It is suitable for use in a wide range of signal processing and data acquisition applications such as:

• Process control and monitoring systems
• Medical imaging and diagnostics systems
• Industrial automation systems
• Automotive control systems
• Test and measurement systems

The LTC1404 also provides high performance for imaging systems and is ideal for low power and low-light sensitive applications.

Working Principle

The LTC1404 consists of two synchronous pipelines, each with a single 8-bit-wide result. The sampling rate of each pipeline can be up to 18Msps. The device accepts either dual single-ended or single differential analog inputs. A multiplexer is used to route the analog input signals to the pipelines. The digital outputs of the two pipelines can be multiplexed and the expected format for the output digital word is 16-bit two’s complement.

The LTC1404 contains on-chip supply-voltage-independent power-on reset, voltage reference, and reference buffer, as well as an integrated analog mux. It also includes programmable-gain buffers, comparators and an on-chip 10-bit multiplying DAC (MDAC) with programmable full-scale ranges. This MDAC is used to auto-calibrate the device with no external components needed.

Once the analog input signals have been routed to the pipelines, the input level is compared against the internal or external reference. The result of the comparison is stored in an on-chip result register and is output as a 16-bit word. For single-ended input signals, the word varies from 0 to 4095. For differential inputs, the word varies from -2048 to 2047. For each pipeline, the result is stored whether or not data is available for a particular input. This allows for simultaneous acquisition of multiple inputs for higher speed operation.

The LTC1404 also contains a low latency digital interface that provides separate clock, reset, and control inputs for each pipeline. Additionally, it has an SPI port to program the user-selectable analog reference, full scale range, and digital filter setting for the converter. A control register allows for partial power down and enables adjustment of device performance parameters.

Conclusion

The LTC1404 is a high performance, dual 8-bit ADC suitable for use in a variety of signal processing and data acquisition applications. Its features include fast settling, precise reject and auto-offset calibration, and a powerful software library. Its multiple pipelines are capable of sampling up to 18Msps and the device requires no external components for calibration. The LTC1404 is ideal for low power and low light sensitive applications, and is an excellent choice for medical imaging and diagnostics systems.

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