Precision reinforced isolated amplifier for voltage sensing

The AMC1311 device, from Texas Instruments, is a precision, isolated amplifier with an output detached from the input circuitry by an isolation barrier that is extremely resistant to magnetic interference. This barrier is certified to provide reinforced galvanic isolation of up to 7kVPEAK according to VDE V 0884-11 and UL1577. Used together with isolated power supplies, this device separates parts of the system that operate on different common-mode voltage levels and protects lower-voltage parts from damage. The high-impedance input of the device is optimised for connection to high-voltage resistive dividers or other voltage signal sources with high output resistance. The performance of the device supports accurate, low-temperature drift voltage or temperature sensing and control in closed-loop systems. The integrated missing high-side supply voltage detection feature simplifies system-level design and diagnostics. The device is offered with two performance grade options: the AMC1311B is specified over the extended industrial temperature range of –55C to +125C, and the AMC1311 for operation at –40C to +125C.