LVDS isolators in DAQ signal chain

Why use an LVDS isolator like ADN4624 in my DAQ signal chain?

[edited by: EstiS at 7:33 AM (GMT -4) on 20 May 2021]
  • +1
    •  Analog Employees 
    on Apr 30, 2021 9:11 AM

    Test and measurement equipment may require galvanic isolation for operator safety (or patient safety in the case of healthcare applications).

    The isolation barrier also protects data integrity in the present of EMI, while a floating ground plane may allow large voltage offsets between the device under test and the measurement system.

    Using digital isolators with LVDS I/O allows  drop-in isolation with compact ICs, as LVDS is compatible with high-speed I/O blocks for FPGAs, as well as ADCs with built in LVDS capabilities such as ADAQ23875 and LTC2387-18.

    Enhanced iCoupler technology from ADI ensures minimal additive phase jitter, as low as 85 fs, ensuring that full ADC performance can still be realized.

    In addition, the transformer-based technology now supports data rates of up to 2.5 Gigabits, well beyond the hundreds of Megabits required by the latest precision ADCs.

    Compared to fiber solutions, ADN4624 reduces design complexity and total system cost; while much smaller solution sizes are possible than traditional digital isolators only offering up to 150 Mbps.  When combined with FPGA SERDES,

    ADN4624 can also be used to isolate ADCs with parallel CMOS I/O; or aggregate data from multiple channels across a gigabit isolation link.