AD8551

The AD855x series amplifiers employ a patented fast-step response, chopper-stabilization technique for input offset voltage correction, achieving ultralow offset and drift. This approach continuously measures and compensates for input offset, eliminating drift over time and temperature as well as 1/f noise. This design breakthrough enables the devices to achieve a 1.5MHz gain bandwidth product and a 1.2V/μs slew rate while consuming only 125μA of supply current. These devices are unity-gain stable and feature excellent power supply rejection ratio and common-mode rejection ratio. The AD855x series is ideal for applications requiring precision amplification of low-level signals that cannot tolerate error sources, yet demand high bandwidth and fast transient response. Rail-to-rail input and output swing simplifies both high-side and low-side sensing. The LTH855x series operates from a single supply as low as 1.8V, making it suitable for dual-battery applications. AD855x op amps feature enhanced EMI protection to minimize interference from external sources and offer high ESD protection (5-kV HBM). All grades are specified over the extended industrial temperature range of -40°C to +125°C.

Applications

• Precision current sensing
• Resistance temperature detectors
• Temperature, position, and pressure sensors
• Medical equipment
• Electronic scales

Key features

• High DC accuracy: max offset voltage ±8μV, max drift ±40nV/℃; min open-loop gain 112dB (VDD = 5.5V); min PSRR 112dB (VDD = 5.5V); min CMRR 112dB (VDD = 5.5V); typical input voltage noise 0.45μVPP (f = 0.1 to 10Hz)
• 1.5MHz bandwidth and 1.2V/μs slew rate
• Settling time to 0.1% accuracy: 1.2μs for 1V step signal
• Overload recovery to 0.1% accuracy: 35μs
• Micropower, 125μA per amplifier, wide supply voltage range 1.8V to 5.5V
• Operating temperature range: -40℃ to +125℃