AD573SD/883B

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AD573SD/883B Analog to Digital Converters (ADC) are extremely versatile devices used to convert analog signals into digital signals. Their application field is wide and covers a variety of electronic systems, from robotics and automotive to medical and aerospace. With their broad selection of input and output channels, wide range of data throughput speeds, and various power supply options, these ADCs provide a cost-effective solution to quickly and accurately acquire analog data.

The AD573SD/883B ADC features a 16-bit successive approximation register (SAR) converter with a 13-bit plus sign A/D converter. The family of devices includes 8 single-ended analog input models, 6 differential analog input models, 5 digital signal processing (DSP) ready PDM models, and 2 16-bit CODECs. All models provide a very low 20μV offset voltage, a wide input signal range of 0V to 5V, and a single voltage power supply of +3.3V to +5.5V, making them perfect for battery-powered applications. The wide variety of output choices include SPI, I2C, and PDM interfaces.

The AD573SD/883B ADC also features a highly optimized converter design and system architecture that allows high-speed operation while consuming less electrical power. By employing a time-interleaved architecture and advanced calibration techniques, the power efficiency is maximized while maintaining a high conversion rate. These devices can achieve a maximum throughput of up to 400 ksps, depending on the model, and have a wide conversion range adjusting from 1x to 256x, allowing them to easily fit the most demanding resolution and speed requirements.

As for the working principle, AD573SD/883B ADCs operate by sampling an analog voltage waveform and converting it into a digital signal, which then can be used for further processing in a digital logic circuit. The basic operational mode of this particular ADC is based on a successive approximation register (SAR) design. The SAR design ensures an accurate conversion with a very fast settling time.

At the beginning of a conversion, the SAR holds the most current value of the analog input voltage. This initial value is then compared, bit by bit, with a reference subject to the internal capacitance DAC (steady voltage ramp generator). If the sampled voltage is greater than the internal reference, then the bit goes high, and vice versa. As all the bits are compared and updated, the output of the successive approximation register will asymptotically approach the value of the sampled analog input voltage.

In summary, the AD573SD/883B Analog to Digital Converter (ADC) family consists of a wide range of devices generally used for acquiring and processing analog data in electronic systems. The AD573SD/883B has a variety of input and output options that make it suitable for many different applications. It also features a highly efficient SAR design with fast settling time and excellent precision, as well as a low-power time-interleaved system architecture that ensures a high throughput rate.

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