Product Details
●The AD820 is a precision, low power FET input op amp that can operate from a single supply of 5 V to 36 V, or dual supplies of ±2.5 V to ±18 V. 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 10 mV of each rail, providing the maximum output dynamic range.
●Offset voltage of 800 μV maximum, offset voltage drift of 2 μV/°C, typical input bias currents below 25 pA, and low input voltage noise provide dc precision with source impedances up to 1 GΩ. 1.8 MHz unity gain bandwidth, −93 dB THD at 10 kHz, and 3 V/μs slew rate are provided for a low supply current of 800 μA. The AD820 drives up to 350 pF of direct capacitive load and provides a minimum output current of 15 mA. 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.
●The AD820 is available in two performance grades. The A and B grades are rated over the industrial temperature range of −40°C to +85°C. The AD820 is offered in three 8-lead package options: plastic DIP (PDIP), surface mount (SOIC) and (MSOP).
●Applications
● Battery-powered precision instrumentation
● Photodiode preamps
● Active filters
● 12-bit to 14-bit data acquisition systems
● Medical instrumentation
● Low power references and regulators
●Data Sheet, Rev. F, 11/08
●### Features and Benefits
● True single-supply operation
●Output swings rail-to-rail
●Input voltage range extends below ground
●Single-supply capability from 5 V to 36 V
●Dual-supply capability from ±2.5 V to ±18 V
● Excellent load drive
●Capacitive load drive up to 350 pF
●Minimum output current of 15 mA
● Excellent ac performance for low power
●800 μA maximum quiescent current
●Unity-gain bandwidth: 1.8 MHz
●Slew rate of 3 V/μs
● Excellent dc performance
●800 μV maximum input offset voltage
●2 μV/°C typical offset voltage drift
●25 pA maximum input bias current
● Low noise: 13 nV/√Hz @ 10 kHz
