AD820ARMZ-R7

The AD820 is a precision, low power FET input op amp that can operate from a single supply of 5V to 36V, or dual supplies of ±2.5V to ±18V. It has true single- supply capability, with an input voltage range extending below the negative rail, allowing the AD820 to accommodate input signals below ground in the single- supply mode. Output voltage swing extends to within 10mV of each rail, providing the maximum output dynamic range. Offset voltage of 800μV maximum, offset voltage drift of 2μV/°C, typical input bias currents below 25pA and low input voltage noise provide dc precision with source impedances up to 1 GΩ. 1.8MHz unity gain bandwidth, - 93 dB THD at 10kHz and 3V/μs slew rate are provided for a low supply current of 800μA. The AD820 drives up to 350pF of direct capacitive load and provides a minimum output current of 15mA. This allows the amplifier to handle a wide range of load conditions. This combination of ac and dc performance, plus the outstanding load drive capability, results in an exceptionally versatile amplifier for the single- supply user.

Applications

• Battery- powered precision instrumentation
• Photodiode preamps
• Active filters
• 12- bit to 14- bit data acquisition systems
• Medical instrumentation
• Low power references and regulators

Key features

• True single- supply operation
• Output swings rail- to- rail
• Input voltage range extends below ground
• Single- supply capability from 5 V to 30V
• Dual- supply capability from ±2.5V to ±15V
• Excellent load drive
• Capacitive load drive up to 350 pF
• Minimum output current of 15mA
• Excellent ac performance for low power
• 800μA maximum quiescent current
• Unity- gain bandwidth: 1.8 MHz
• Slew rate of 3V/μs
• Excellent dc performance
• 800μV maximum input offset voltage
• 2μV/°C typical offset voltage drift
• 25 pA maximum input bias current
• Low noise: 13nV/√Hz @10kHz