5 kV/3.75 kV rms, 600 Mbps Dual Channel LVDS Isolator

The ADN4650/ADN4651/ADN46521 are signal isolated, low voltage differential signaling (LVDS) buffers that operate at up to 600 Mbps with very low jitter.

The devices integrate Analog Devices, Inc., iCoupler® technology, enhanced for high speed operation, to provide galvanic isolation of the TIA/EIA-644-A compliant LVDS drivers and receivers. This technology allows drop-in isolation of an LVDS signal chain.

Multiple channel configurations are offered, and the LVDS receivers on the ADN4651/ADN4652 include a fail-safe mechanism to ensure a Logic 1 on the corresponding LVDS driver output when the inputs are floating, shorted, or terminated, but not driven.

For high speed operation with low jitter, the LVDS and isolator circuits rely on a 2.5 V supply. An integrated on-chip low dropout regulator (LDO) can provide the required 2.5 V from an external 3.3 V power supply. The devices are fully specified over a wide industrial temperature range and are available in a 20-lead, wide body SOIC package with 5 kV rms isolation or a 20-lead SSOP package with 3.75 kV rms isolation.

Applications

* Analog front-end (AFE) isolation

* Data plane isolation

* Isolated high speed clock and data links

* Isolated serial peripheral interface (SPI) over LVDS

* 5 kV rms/3.75 kV rms LVDS isolator

* Complies with TIA/EIA-644-A LVDS standard

* Multiple dual-channel configurations

* Up to 600 Mbps switching with low jitter

* 4.5 ns maximum propagation delay

* 151 ps maximum peak-to-peak total jitter at 600 Mbps

* 100 ps maximum pulse skew

* 600 ps maximum part to part skew

* 2.5 V or 3.3 V supplies

* −75 dBc power supply ripple rejection and glitch immunity

* ±8 kV IEC 61000-4-2 ESD protection across isolation barrier

* High common-mode transient immunity: >25 kV/μs

* Passes EN55022 Class B radiated emissions limits with 600 Mbps PRBS