The ICL7135 Integrating A/D Converter Functional Diagram and Datasheet

The schematic below shows the ICL7135 integrating analog-to-digital converter (ADC) functional diagram. According to the datasheet, an integrating converter is the right choice for panel meters and digital voltmeter applications. It can also be used for reducing line frequency noise due to its excellent rejection of frequencies. In the ICL7135 datasheet, there are sections describing the dual slope technique (theory and practice), a simplified dual slope converter circuit diagram, the analog section of the dual slope converter, and more.

The ICL7135 is a highly integrated analog-to-digital converter designed for precision measurement applications. It employs the dual-slope integration technique, which is particularly advantageous for applications where noise reduction is critical, such as in digital voltmeters and panel meters. The dual-slope method works by integrating the input signal over a fixed period, followed by a reference voltage integration over the same duration. This approach effectively cancels out noise and provides high accuracy in voltage measurement.

The functional diagram of the ICL7135 illustrates its key components, including the input stage, integrating capacitor, comparator, and control logic. The input stage is responsible for conditioning the analog signal before it is fed into the integrator. The integrator uses a capacitor to accumulate the input voltage over time, while the comparator continuously monitors the integrated voltage against a reference level. When the integrated voltage reaches the reference, the system switches to the reference integration phase, allowing for precise measurement of the input signal.

The ICL7135 is designed with features that enhance its performance, including high input impedance, low offset voltage, and excellent linearity. These characteristics make it suitable for a wide range of applications beyond just panel meters, including industrial automation, laboratory instrumentation, and consumer electronics. The datasheet provides a wealth of information, including detailed sections on the dual slope technique, simplified circuit diagrams for implementation, and specifications for the analog section of the converter.

Overall, the ICL7135 stands out as a versatile and reliable choice for high-precision analog-to-digital conversion, particularly in environments where minimizing noise and maximizing accuracy are of paramount importance.The schematic below showsthe ICL7135 integrating analog to digital converter (ADC) functional diagram. According to the datasheet, an integrating converter is the right choice for panel meters and digital voltmeter applications.

It also can be used for reducing line frequency noise since it has very good rejection of frequencies. In theICL7135 dat asheet, you will find sections for such the description of dual slope technique (theory and practice), simplified dual slope converter circuit diagram, analog section of dual slope converter, and more. 🔗 External reference