ADCs simplify PLC module development

Two multi-channel ±10V and 0 to 20mA precision ADCs are claimed to enable better implementation of programmable logic controller (PLC) and distributed control system (DCS) modules.

The AD4111 and AD4112 ADCs are based on Analog Devices’ iPassives integrated precision passives technology. The ADCs integrate precision matched current sense resistors and resistor dividers. The degree of channel-to-channel matching simplifies calibration requirements, says Analog Devices, and offers support for up to eight single-ended voltage inputs and four current inputs, making them particularly suitable for use as reconfigurable platform solutions, while reducing size, complexity and cost in PLC and DCS modules.

The AD4111 and the AD4112 A/D converters 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 while meeting performance specifications. Measurements can be close to 0mA and provide over range margin above 20mA. The devices offer an absolute maximum rating of ±50V on voltage pins and ±50mA on current pins.

The AD4111 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 and AD4112 are available in an LFCSP package, measuring 6.0 x 6.0 x 0.95mm. Evaluation boards, the Eval-AD4111SDZ and Eval-AD4112SDZ are also available now.

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