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Two ADCs simplify PLC and distributed control
The two multi-channel ±10V and 0 to 20mA precision ADCs are designed to simplify the implementation of programmable logic controller (PLC) and distributed control system (DCS) modules. The AD4111 and AD4112 ADCs use the company’s Passives integrated precision passives technology and integrate precision matched current sense resistors and resistor dividers. The channel-to-channel matching simplifies calibration requirements, explains the company. There is support for up to eight single-ended voltage inputs and four current inputs, making the ADCs particularly suitable for use as reconfigurable platform solutions, while reducing size, complexity and cost in PLC and DCS modules.

The ADCs can accept ±10V while meeting performance specifications and has a functional range of ±20V, adding over-range margin to the nominal ±10V. They can also accept currents of -0.5 to 24mA, allowing measurements close to 0mA with an over range margin above 20mA.

Both offer an absolute maximum rating of ±50V on voltage pins and ±50mA on current pins.

A feature of the AD4111 is that it enables open wire detection, to detect when an external sensor or signal source is disconnected from the system input, on ±10V voltage inputs while operated from either a 5V or 3.3V single power supply. When used in conjunction with the ADuM5411 quad-channel digital isolator, the AD4111 supports EMC/EMI standards IEC 61000-2, IEC 61000-3, IEC 61000-4, IEC 61000-5, IEC 61000-6, and CISPR 11.

The AD4111 is available now in a 40ld LFCSP, measuring 6.0 x 6.0 x 0.95mm. The AD4112 is also available now in the same package. Evaluation boards (the Eval-AD4111SDZ and Eval-AD4112SDZ) are also available now.

 



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