ADS7822P

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Data Acquisition is a type of technology used to transmit signals from a physical environment to a generator. Data Acquisition systems can be used to capture a range of signals, including mechanical, electrical, optical, and thermal. An Analog to Digital Converter (ADC) is a type of Data Acquisition system designed to encode analog signals into a digital signal, allowing the signal to be processed by computer systems.

An example of an Analog to Digital Converter is the ADS7822P. This specific ADC was designed to operate in a wide range of applications, ensuring accurate signal capture for both commercial and industrial applications.

The ADS7822P features a high-resolution and a low differential non-linearity, which results in an increased accuray of digital signal conversion. It is a low power, single ended, 12-bit switching ADC that is capable of a Wide differential input voltage range of ±Vref/2 to Vref/2. This ADC offers very low power dissipation, and its single-ended analog inputs make it ideal for handheld applications and battery powered designs.

The working principle of the ADS7822P is based on the traditional switched capacitor design. It is built around a 2 stage amplifier and a 4-step successive approximation register. In theory, the amplifier partially cancels the information in each sample and passes the remainder to the SAR. The successive approximation is then applied to the remainder by the SAR to determine the required result.

The ADS7822P works by charging a capacitor to the input voltage. Then it allows the same amount of current to flow into the charge capacitor. This action outputs a voltage output into the digital circuits where the result is compared to a reference voltage. The exact voltage is determined by the comparison results and is used as the final digital output.

The ADS7822P also features integrated timing circuits and control logic to simplify control and provide a programmable conversion-rate. The internal design of the ADC enables it to reduce the overall number of external components required for integration in the system.

The ADS7822P is an excellent choice for designs that require a low power, single ended 12-bit switching ADC due to its wide differential input voltage range and low power consumption. Its internal design also allows it to be integrated easily into existing systems with minimal additional components.

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