**LTC2420CS8#PBF: A High-Precision 20-Bit Delta-Sigma ADC with Integrated Oscillator**

In the realm of data acquisition and precision measurement, the ability to accurately convert analog signals into digital data is paramount. The **LTC2420CS8#PBF** from Analog Devices stands out as a exemplary solution, **integrating a high-performance 20-bit delta-sigma analog-to-digital converter (ADC) with a precision on-chip oscillator**. This combination delivers exceptional accuracy and simplifies system design, making it an ideal choice for demanding applications.

At the core of this 8-pin SOIC device is a **high-resolution delta-sigma modulator**. This architecture is renowned for its inherent linearity and excellent noise rejection, particularly against 50Hz and 60Hz power line interference. The LTC2420 achieves **outstanding DC performance**, offering **no missing codes** and a typical total unadjusted error of just 10µV. Its integrated oscillator eliminates the need for an external crystal or clock circuitry, which not only saves valuable board space but also reduces the bill of materials and design complexity. The ADC operates from a single 2.7V to 5.5V supply, drawing a mere 200µA of current, making it suitable for both portable and industrial systems.

Communication is handled through a simple, **3-wire digital interface** that is compatible with SPI and MICROWIRE protocols. A unique feature of the LTC2420 is its built-in digital filter, which settles in a single cycle. This allows for a variable output data rate; when continuous conversions are performed, the output rate is synchronized to the internal oscillator at approximately 7.5Hz. Alternatively, it can be synchronized to an external clock for more flexible timing. The device also includes a proprietary input sampling scheme that reduces the average input current by several orders of magnitude, minimizing the need for driving circuitry.

The applications for such a precise and easy-to-use ADC are vast. It is perfectly suited for:

* **High-resolution sensor interfaces** for strain gauges, thermocouples, and pressure transducers.

* **Precision industrial process control** and automation systems.

* **Portable instrumentation** and medical equipment where power and space are constrained.

* **Direct digitization** of low-level signals from bridges and transducers.

**ICGOOODFIND**: The LTC2420CS8#PBF is a superior choice for designers seeking a no-compromise, high-resolution ADC. Its **exceptional integration**, combining a precision 20-bit core with an onboard oscillator, delivers maximum accuracy with minimal external components. This device provides a complete, simple, and robust signal chain solution for the most demanding precision measurement applications.

**Keywords**: High-Precision ADC, 20-Bit Resolution, Delta-Sigma Modulator, Integrated Oscillator, Low Noise.