ADN4620 Dual LVDS 2.5 Gigabit Isolators

Featured Product from Digi-Key Electronics

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ADI's ADN4620 is a dual-channel, signal isolated, low voltage differential signaling (LVDS) buffer that operates at up to 2.5 Gbps with very low jitter. The devices integrate ADI iCoupler technology enhanced for high-speed operation to provide drop-in galvanic isolation of LVDS signal chains. AC coupling, level shifting to the LVDS receivers and from the LVDS drivers, or both allow isolation of other high-speed signals, such as current mode logic (CML).

The ADN4620 includes a refresh mechanism to monitor the input and output states and ensure that it remains the same in the absence of data transitions (for example, at power-on). For lower power consumption and high-speed operation with low jitter, the isolator circuits rely on 1.8 V supplies. In comparison, 3.3 V supplies are used for LVDS receivers to support the full common-mode range with an input voltage range (input common mode plus differential input voltage) of 0 V to 2.4 V per Table 2 in the data sheet.

The devices are fully specified over a wide industrial temperature range and are available in a compact SSOP package with 5.3 mm creepage (for reinforced insulation at AC mains voltages).

The EVAL-ADN4620EBZ allows quick and easy evaluation of the ADN4620 LVDS isolators without needing external components. The ADN4620’s iCoupler technology combines a 2-channel isolator with LVDS receivers and drivers into a single, 20-lead SSOP package. The ADN4620 is capable of running at data rates of up to 2.5 Gbps with low jitter.

  • 3.75 kVRMS LVDS isolators
  • Complies with TIA/EIA-644-A LVDS signal levels
  • Dual-channel configuration (ADN4620: 2 + 0, ADN4621: 1 + 1)
  • Any data rate up to 2.5 Gbps switching with low jitter
    • 5 Gbps total bandwidth across two channels
    • 2.15 ns typical propagation delay
    • Typical jitter: 0.82 ps rms random, 40 ps total peak-to-peak
  • Lower power 1.8 V supplies with 3.3 V supplies for I/O
  • ±7 kV IEC 61000-4-2 ESD protection across isolation barrier
  • High common-mode transient immunity: 70 kV/μs typical
  • Safety and regulatory approvals (20-lead SSOP package)
    • UL (pending): 3750 VRMS for 1 minute per UL 1577
    • CSA Component Acceptance Notice 5A (pending)
    • VDE certificate of conformity, reinforced insulation (pending)
      • DIN V VDE V 0884-11 (VDE V 0884-11):2017-01
      • VIORM = 1500 VPEAK (maximum working insulation voltage)
  • Enable or disable refresh (low-speed output correctness check)
  • Operating temperature range: -40°C to +125°C
  • Compact SSOP package with 5.3 mm creepage
  • Analog front-end isolation
  • Data plane isolation
  • Isolated high-speed clock and data links
  • Multigigabit serialization/deserialization (SERDES)
  • PCB-to-PCB optical replacement (for example, short reach fiber)