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ADN4621BRSZ Device Overview:

The ADN4620/ADN46211 are dual, signal-isolated, low-voltage differential signal (LVDS) buffers that operate at speeds up to 2.5 Gbps with extremely low jitter. These devices integrate Analog Devices, Inc.'s iCoupler® technology, which is enhanced for high-speed operation, to provide drop-in galvanic isolation for the LVDS signal chain. AC coupling and/or level translation to the LVDS receiver and LVDS driver allows isolation of other high speed signals such as current mode logic (CML).

The ADN4620/ADN4621 include a refresh mechanism to monitor the input and output states and ensure that they remain unchanged in the absence of data transitions (e.g. at power-up). To achieve lower power consumption and low jitter for high speed operation, the isolator circuitry relies on a 1.8 V supply, while a 3.3 V supply is used for the LVDS receiver 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, see Table 2.

The ADN4620 and ADN4621 have a wide industrial temperature range and are available in a compact SSOP package with a creepage distance of 5.3 mm (for enhanced insulation at AC supply voltages).

Features

3.75kVrms LVDS isolator

TIA/EIA-644-A LVDS signal level compliant

Dual channel configuration (ADN4620: 2 + 0, ADN4621: 1 + 1)

Capable of switching at any data rate up to 2.5Gbps with low jitter

Total bandwidth on both channels: 5Gbps

Propagation delay: 2.15ns (typical)

Typical jitter: 0.82ps rms random, 40ps total peak-to-peak

Low power 1.8V supply, 3.3V supply for I/O

±7kV IEC 61000-4-2 ESD protection (entire isolation gate)

High common mode transient rejection: 70kV/μs (typical)

Safety and regulatory approval (20-pin SSOP package)

UL (pending): 3750V rms for 1 minute to UL 1577

CSA Component Approval Notice 5A (in progress)

VDE Certificate of Conformity, Enhanced Insulation (application in progress)

DIN V VDE V 0884-11 (VDE V 0884-11): 2017-01

VIORM = 1500VPEAK (maximum working insulation voltage)

Refresh enabled or disabled (low speed output correctness check)

Operating temperature range: -40°C to +125°C

Compact SSOP package with a creepage distance of 5.3mm

Applications

Analogue front-end isolation

Data plane isolation

Isolated high-speed clock and data links

Multi-gigabit serialisation/deserialisation (SERDES)

PCB-to-PCB optical alternatives (e.g. short-haul fibre)

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