7.5 kV RMS/3.75 kV RMS, Dual-Channel LVDS 2.5 Gigabit Isolator (1 Reverse Channel)

The ADN4620/ADN4621 are dual-channel, signal isolated, low voltage differential signaling (LVDS) buffers that operate at up to 2.5 Gbps with very low jitter. The devices integrate Analog Devices, Inc., iCoupler® technology, enhanced for high speed operation to provide drop-in galvanic isolation of LVDS signal chains. AC coupling and/or level shifting to the LVDS receivers and from the LVDS drivers 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 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, while 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) or a wide SOICIC package with 16 mm creepage (for high working insulation voltages up to 1500 VPEAK, reinforced).

APPLICATIONS

* 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)

Protected by U.S. Patents 7,075,329; 9,941,565; and 10,205,442. Other patents are pending.

* 7.5 kV rms/3.75 kV rms 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

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

* High common-mode transient immunity: 70 kV/μs typical