Triple-Rail Isolator Eyes Industrial Data Acquisition

Ground potentials in industrial systems applications can vary widely, often exceeding the tolerable range, leading to communications disruptions or potentially destroying components. Linear Technology’s LTM2883, a six-channel SPI/Digital or I²C digital µModule isolator with triple-rail regulated power for 3.3- and 5-V systems, breaks ground loops by electrically separating communications signals. It isolates the logic-level interface on each side of an internal inductive isolation barrier that withstands a very large common-mode voltage range up to 2500 V rms. A low EMI-isolated dc-dc converter powers the communications interface and provides adjustable 5-, +12.5-, and −12.5-V supply outputs to power, for instance, data converters in data-acquisition systems. Two communications interface versions are available: the LTM2883-I (I²C-compliant up to 400 kHz with bidirectional SDA serial data plus SCL clock and three additional CMOS logic signals) and LTM2883-S (SPI-compliant with six CMOS digital communications channels). All channels operate at up to 20 Mbits/s.

LINEAR TECHNOLOGY CORP.