OP491GSZ Operational amplifier, 4-fold, 0.5 V/µs, 3 MHz, SO-14

Micropower Single-Supply Rail-to-Rail Input/Output Op Amps

Description The OP191, OP291, and OP491 are single, dual, and quad micropower, single-supply, 3 MHz bandwidth amplifiers featuring rail-to-rail inputs and outputs. All are guaranteed to operate from a +3 V single supply as well as ±5 V dual supplies. Fabricated on Analog Devices CBCMOS process, the OPx91 family has a unique input stage that allows the input voltage to safely extend 10 V beyond either supply without any phase inversion or latch-up. The output voltage swings to within millivolts of the supplies and continues to sink or source current all the way to the supplies. Applications for these amplifiers include portable tele-communications equipment, power supply control and protection, and interface for transducers with wide output ranges. Sensors requiring a rail-to-rail input amplifier include Hall effect, piezo electric, and resistive transducers. The ability to swing rail-to-rail at both the input and output enables designers to build multistage filters in single-supply systems and to maintain high signal-to-noise ratios. The OP191/OP291/OP491 are specified over the extended industrial -40°C to +125°C temperature range. The OP191 single and OP291 dual amplifiers are available in 8-lead plastic SOIC surface-mount packages. The OP491 quad is available in a 14-lead PDIP, a narrow 14-lead SOIC package, and a 14-lead TSSOP.

Features - Single-supply operation: 2.7 V to 12 V - Wide input voltage range - Rail-to-rail output swing - Low supply current: 300 µA/amp - Wide bandwidth: 3 MHz - Slew rate: 0.5 V/µs - Low offset voltage: 700 µV - No phase reversal

Applications - Industrial process control - Battery-powered instrumentation - Power supply control and protection - Telecommunications - Remote sensors - Low voltage strain gage amplifiers - DAC output amplifiers