ADS7861IRHBR

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The ADS7861IRHBR is a high-speed and low-power 8-bit bus-oriented analog to digital converter (ADC). The main application fields of the ADS7861IRHBR is automotive, industrial and communication systems where precise and reliable analog to digital conversion is required. The device works by the principle of chopping (also called “resonant method” or “interleaved aliasing technique”), which is to rapidly and accurately sample the input signals at a fixed frequency. It is one of the most precise analog to digital converters (ADCs) thanks to its repeatability and fast integration time.

The main characterstics of the ADS7861IRHBR include a resolution of 8 bit, an architecture of one-shot conversion with internal or external clock and an input range from 0V to 3.6V with a samplind rate of up to 200kSPS. The device includes an internal track-and-hold amplifier with low noise (0.35µVrms) which allows it to accurately sample input signals at high frequencies. The device also supports low-power modes, making it suitable for applications where power consumption is critical.

The ADS7861IRHBR features two types of outputs, serial (SPI) and parallel (Sigma-Delta). The SPI output provides 8-bit conversion data at a rate of up to 200kSPS and the Sigma-Delta output is a low frequency serialized pulse density-modulated (PDM) output, with a resolution of 16-bit and sampling rate up to 500kSPS. The PDM output can be used as a reference input for other data converters, which enables applications such as auto-calibration.

The ADS7861IRHBR working principle is based on chopping, a technique that enables precise and fast direct sampling of signals. The chopping circuit reduces the amount of clock energy that needs to be dissipated to perform the conversion and is done by sampling the input signal at a known frequency and then choosing a point within the sample period to adjust the gain. The chopped signal is then filtered and amplified up to the full scale of the ADC.

The advantage of the ADS7861IRHBR is that it offers an extremely fast conversion speed of up to 200kSPS with a resolution of 8-bit and low-power consumption of about 10mW. The device also features Sigma-Delta output that allows for a higher resolution and sampling rate of up to 500kSPS. The programmable slew rate and track-and-hold time can be adjusted to accommodate different types of signals. The low-noise track-and-hold amplifier ensures that the signal remains undistorted during the testing process.

In conclusion, the ADS7861IRHBR is a highly versatile and low-power bus-oriented analog to digital converter designed for automotive, industrial and communication systems. It offers high conversion speed of up to 200kSPS with a resolution of 8-bit and programmable slew rate and track-and-hold time. The device also features a Sigma-Delta output with increased resolution and sampling rate of up to 500kSPS. The ADS7861IRHBR is suitable for applications requiring precise and reliable analog to digital conversion.

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