Fast LVDS isolators eliminate de-serialising in industrial environments

February 12, 2016 // By Graham Prophet
Analog Devices has introduced a low-voltage differential signal (LVDS) digital isolator series designed to improve performance, reliability and power consumption in industrial instrumentation and programmable logic controller (PLC) applications that previously required redesign of the interface to support LVDS signal isolation.

Incorporating ADI’s iCoupler digital isolator technology, the ADN465x series ensures safety and reliability through galvanic isolation in a single package while delivering data throughput rates of 600 Mbps (up to four times faster than competing digital isolators), ultralow jitter at 70 psec, and 4.5-nsec max propagation delay. With ADN465x devices, high-speed serial LVDS signals can now be directly isolated without needing to deserialise as compared to previous custom implementations. Design resources and time are saved by offering an off-the-shelf, high-performance, LVDS-compatible solution.

 

In industrial PLC backplanes, data generated from an increasing number of sensors is distributed between processing nodes for improved control, while also maintaining robustness to interference for system dependability. With ultra-low jitter of 70 psec, full compliance to the TIA/EIA-644-A standard, reinforced insulation with surge protection tested at 10 kVpk, and the ability to withstand voltage ratings up to 5 kVrms, these LVDS digital isolators enable advanced I/O extension integration across metres of cable at high signal rates.

 

Real time analysis of grid supply, ADI adds, is paramount as server farm density increases to support the ever-increasing rise in consumption. Smart power quality analysers that enable real-time analysis require precise data at high speeds. In addition to supporting up to 600-Mbps data rates, ADN465x LVDS digital isolators support 300-MHz clocks to enable isolation of precision converters with LVDS interfaces. Source synchronous interfaces are supported with low channel-to-channel skew of 200 psec. Ultra-low additive phase jitter of 380 fsec enables A/D converter sampling clocks to be isolated while maintaining low aperture jitter for full A/D converter performance and resolution.

Product

Availability

Fail Safe Receiver

Inputs

Total Channels

Price Each per 1,000

Packaging

ADN4650

Now

No

Dual-Channel

(same direction)

$5.50

20-lead

SOIC-W

ADN4651

Now

Yes

Dual-Channel

(one each direction)

$5.50

20-lead

SOIC-W

ADN4652

April 2016

Yes

Dual-Channel

(one each direction opposite pin-out)

$5.50

 

20-lead

SOIC-W

 

Analog Devices; www.analog.com/en/products/interface-isolation/isolation/isolated-lvds.html