PCM1781DBQ

The PCM1781DBQ is a special purpose analog-to-digital converter designed for data acquisition applications. It is a dual channel converter with a dynamic range of 75 dB, and a low current consumption of 5 mA. This converter utilizes a high-accuracy, low-noise Delta Sigma modulator architecture to create a high-performance, low-power ADC solution for portable and other low power applications.

The device offers a range of features that makes it suitable for use in a variety of applications. It provides a wide input range, from 0V to 5V, and is able to operate over a wide temperature range, from –20°C to +85°C. In addition, it has a high sampling rate, up to 3.2 Msps, and a low offset voltage error of ± 1 mV. The PCM1781DBQ also provides an on-chip voltage reference, which allows for accurate measurements over temperature and supply voltage variations.

The working principle behind this device is the Delta Sigma Modulation technique. This technique is used to convert an analog input signal into a digital signal. This is accomplished by sampling the input, performing differentiators, integrators, and quantizers, and then passing the output through a analog-to-digital converter. The modulated output is then passed through a low-pass filter and then fed back to the input to close the loop.

The device utilizes a constant-size digital filter that provides high-accuracy, low-noise conversion. The modulated output is 8 bits in resolution with a sampling rate of up to 3.2 Msps. The device is also able to detect and reduce noise, jitter and distortion. Additionally, it provides a programmable output to enable integration with other system components.

In summary, the PCM1781DBQ special purpose analog-to-digital converter provides a high performance and low power solution for data acquisition applications. It features a wide input range, low noise and distortion, high sampling rate, and low power consumption. Additionally, it provides an on-chip voltage reference and programmable output, allowing for accurate integration with other components. This device is suitable for use in a variety of applications, from consumer electronics to precision instrumentation.