Analog Devices has introduced two multi-channel ±10V and 0-20mA precision A/D converters that better enable implementation of programmable logic controller (PLC) and distributed control system (DCS) modules.
Leveraging ADI’s iPassives® integrated precision passives technology, the AD4111 and AD4112 A/D converters integrate precision matched current sense resistors and resistor dividers. The high degree of channel-to-channel matching simplifies calibration requirements, and with support for up to eight single-ended voltage inputs and four current inputs, makes them ideal 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. This allows reliable measurements close to 0mA and provides over range margin past 20mA. The devices offer an Absolute Maximum Rating of ±50V on voltage pins and ±50mA on current pins.
The AD4111 and AD4112 are low power, low noise, 24-bit, sigma-delta (Σ-Δ) analog-to-digital converter (ADC) that integrates an analog front end (AFE) for fully differential or single-ended, high impedance (≥1 MΩ) bipolar, ±10 V voltage inputs, and 0 mA to 20 mA current inputs. The AD4111 and AD4112 also integrates key analog and digital signal conditioning blocks to configure eight individual setups for each analog input channel in use. Both devices feature a maximum channel scan rate of 6.21 kSPS (161 µs) for fully settled data.
The embedded 2.5 V, low drift (5 ppm/°C), band gap internal reference (with output reference buffer) reduces the external component count. Whilst the digital filter allows flexible settings, including simultaneous 50 Hz and 60 Hz rejection at a 27.27 SPS output data rate. The user can select between the different filter settings depending on the demands of each channel in the application. The automatic channel sequencer enables the ADC to switch through each enabled channel.
The precision performance of the AD4111 and AD4112 is achieved by integrating the proprietary iPassives™ technology from Analog Devices, Inc. The AD4111 and AD4112 are both factory calibrated to achieve a high degree of specified accuracy.
The AD4111 device also uniquely 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.
The AD4111 and AD4112 devices also offer a high level of robustness to EMC/EMI and are tested per IEC6100-4-x and CISPR 11 for industrial automation. See Application Note AN-1572 for more details.
View a demonstration of the EMC/EMI robustness of the AD4111/AD4112
The AD4111 and AD4112 operate with a single power supply, making them easy to use in galvanically isolated applications. The specified operating temperature range is −40°C to +105°C and both devices are available housed in a 40-lead, 6 mm × 6 mm LFCSP package.
Anglia are offering customers a FREE evaluation board and samples of the AD4111 and AD4112 multi-channel precision A/D converters from Analog Devices, please fill in the form below to register your interest now.
FREE samples for UK and Ireland customers only, subject to availability.
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