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September 21, 2020

Q.series X A122

The Fastest EtherCAT Module with High-Voltage Inputs for Loop Control Applications

The Q.series X A122 module was specially developed for meeting the demands of loop control applications in the high-voltage area for e-mobility in the automotive industry. At present, the A122 is the fastest EtherCAT module on the market for this dedicated job. It offers two analog inputs. One input is typically for measuring the phase voltage up to 1,200 V, and the second is for measuring the phase current with an external shunt. The high galvanic isolation allows a continuous potential shift of 1,200 V between the channels and the rest of the electronics, power supply, and CPU/communication. With its symmetric input channel design with up to ±1200 V, it is also reverse polarity protected. Minimizing group delays is vital for a high-quality loop control function. The A122 is equipped with a specialized 18-bit SAR ADC per channel to avoid any latency impact.

The module is available for DIN rail, 19” 3U, and Q.brixx for portable applications.


What is SAR ADC?

The method of Successive Approximation Register – SAR is a method used in A/D converters for converting the analog signal into a digital signal. It is based on the comparison of the analog input voltage with a reference voltage. In successive approximation, the comparison is made step by step and is repeated continuously, whereby the reference voltage is changed so that it increasingly approaches the input voltage. Unlike a sigma-delta ADC, the SAR architecture doesn’t have latency. The relatively high sample rate and zero-latency make the SAR ADC suitable for loop control applications.


Key Features:

  • High-Isolation Module for Voltages with 2 Channel at 100 kS/s, each with SAR ADC
  • 1 Voltage channel
    Input range ±40 V, ±120 V, ±400 V, ±1200 V
  • 1 Current channel (via Shunt Resistor)
    Input range ±80 mV, ±240 mV, ±800 mV, ±2400 mV
  • Fast, high-accuracy digitization with 18-bit SAR ADC
  • Galvanic isolation of 1200 VDC / 848 VACrms permanent channel-to-channel, -power supply, and -interface, test voltage 5k VDC over 1 minute
  • Software selectable Filters per channel (IIR, low-pass, high-pass, band-pass as Butterworth or Bessel up to 8th order)
  • High-Voltage Banana inputs

Read more about our full DAQ I/O options here.

Author: Benedikt Heinz

Benedikt Heinz is Gantner Instrument's Vice President and Global Sales Manager.

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