High Common-Mode Voltage Difference Amplifier Enables Direct Interface to High Voltage Input up to ±600 V

Designed for applications such as motor control, process control and power supplies, the AD8479 enables accurate measurements of currents in the presence of voltage fluctuations as large as ±600 V without additional complex signal conditioning components.



The AD8479 guarantees to reject ±200V with ±5V power supplies. The AD8479 offers cost-effective isolation and can replace more costly devices in applications that do not require galvanic isolation. With higher than 90 dB CMRR, 130 kHz bandwidth, 2MΩ differential input impedance, within 0.02% gain error and 5ppm/°C gain drift, the AD8479 offers precision over a wide range of common-mode voltages and frequencies. It operates over an extended temperature range of -40°C to +125°C.



The AD8479 is a difference amplifier with a very high input common-mode voltage range. The AD8479 is a precision device that allows the user to accurately measure differential signals in the presence of high common-mode voltages up to ±600 V. The AD8479 can replace costly isolation amplifiers in applications that do not require galvanic isolation. The device operates over a ±600 V common-mode voltage range and has inputs that are protected from common-mode or differential mode transients up to ±600 V.



The AD8479 has low offset, low offset drift, low gain error drift, low common-mode rejection drift, and excellent CMRR over a wide frequency range.



The AD8479 is available in a space-saving 8-lead SOIC package. It is operational over the −40°C to +125°C temperature range.



Applications



-High voltage current sensing

-Battery cell voltage monitor

-Power supply current monitor

-Motor controls

-Isolation