Analog Devices AD4111/AD4112 24-Bit Sigma-Delta analog to digital converter

     Analog Devices' AD4111 and AD4112 are low-power, low-noise, 24-bit Sigma Delta ADCs. These ADCs integrate an analog front end (AFE) for fully differential or single-ended high-impedance (≥1 millioeur) bipolar, ±10 V voltage input and 0 mA to 20 mA current input.

     The AD4111 and AD4112 integrate key analog and digital signal conditioning blocks, configuring eight separate Settings for each analog input channel in use. These ADCs feature a maximum channel sweep rate of 6.2 over proliferated for fully resolved data (161 μs). Built-in 2.5V, low drift (5ppm /°C) bandgap internal reference (with output reference buffer), reduces external component count.

     The digital filter allows for flexible Settings, including simultaneous 50 Hz and 60 Hz rejection at a 27.27 SPS output data rate. Users can choose between different filter Settings based on the requirements of each channel in the application. The automatic channel collator enables the ADC to switch through each enabled channel. The precision performance of these ADCs is achieved by integrating proprietary iPassives technology and being calibrated in the factory to achieve a high degree of specified accuracy.

     The AD4111 also has the unique capability of open-circuit detection of voltage inputs (patent pending) for system-level diagnostics using a single 5 V or 3.3V power supply. The AD4111 and AD4112 operate with a single power supply, making them easy to use in electrical isolation applications. The specified operating temperature range is -40°C to +105°C, and they are available in a 40-pin, LFCSP package. They are designed for use with PLC and DCS modules.