Date: 19/12/2012

Not-so-expensive sensor-interface op-amp from ADI for process control sys

Analog Devices, Inc. (ADI) has made available a high precision operational amplifier designed for applications in process control, chemical and environmental monitoring, motor control and electronic test and instrumentation.

The ADA4077-2 has a typical bandwidth of 3.9 MHz and 7-nV/ÖHz voltage noise at 1 kHz while consuming only 400 µA typical at 25°C with ±15-Vdc nominal power supplies. Available in two grades for offset and thermal drift, the device provides design engineers with the flexibility to meet budget and packaging requirements. ADI claims this device offers better performance than the similar competing op amps in the market.

ADA4077-2 suggested as ideal front end amplifier in designing sensor interfaces for applications such as process control input modules, where high accuracy, precision, and linearity are critical to accurate measurement of sensor output.

ADA4077-2 Precision Operational Amplifier Key Features:
· Low offset voltage: 25µV maximum (B-Grade)
· Low offset voltage drift: 0.25 µV/°C maximum (B-Grade)
· Low input bias current: <1.0 nA maximum
· Input voltage range: V- +1.2 V to V+ -2 V
· Low noise: 7 nV/vHz typical
· Low supply current: 400 µA per amplifier typical
· Specified for dual voltage supply operation from ±5 V to ±15 V