Analog Devices' ADN4654 and ADN4655 signal-isolated LVDS buffers operate at up to 1.1 Gbps with low jitter. The devices integrate Analog Devices' iCoupler® technology, enhanced for high-speed operation, to provide galvanic isolation of the TIA/EIA-644-A compliant LVDS drivers and receivers. This integration allows drop-in isolation of an LVDS signal chain.
The ADN4654 and ADN4655 comprise multiple channel configurations, and the LVDS receivers on the ADN4655 include a failsafe 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 (LDO) regulator 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 come in a 20-lead, wide body SOICW package with 5 kVrms isolation or in a 20-lead SSOP package with 3.75 kVrms isolation.
Features
- Integration: 1.1 Gbps LVDS isolator in SOICW or SSOP package (more than 5x to 7x faster than the competition)
- Precision timing: ultra-low jitter at 2.6 psrms (typ. random jitter) and 4.5 ns max propagation delay
- Robustness: 3 kV and 5 kV reinforced isolation provides high common mode immunity and transient immunity for external ports
- 5 kVrms and 3.75 kVrms LVDS isolators
- Complies with TIA/EIA-644-A LVDS standard
- Multiple dual-channel configurations
- 2.5 V or 3.3 V supplies
- Any data rate up to 1.1 Gbps switching with low jitter
- 4 ns typical propagation delay
- 2.6 psrms typical random jitter
- 90 ps typical peak-to-peak total jitter at 1.1 Gbps
- -75 dBc power supply ripple rejection, phase spur level
- Glitch immunity
- ±8 kV IEC 61000-4-2 ESD protection across the isolation barrier
- High common-mode transient immunity: >25 kV/µs
- Passes EN 55022 Class B radiated emissions limits with 1.1 Gbps PRBS (pending)
- Safety and regulatory approvals (20-lead SOICW package)
- UL (pending): 5000 Vrms for 1 minute per UL 1577
- CSA Component Acceptance Notice 5A (pending)
- VDE certificate of conformity (pending)
- DIN V VDE V 0884-10 (VDE V 0884-10):2006-12
- VIORM = 424 VPEAK
- Operating temperature range: -40°C to +125°C
- 7.8 mm creepage and clearance
Applications
- Isolated video and imaging data
- Analog front-end isolation
- Data plane isolation
- Isolated high-speed clock and data links