AD820ARZ-REEL7 Audio Power Amplifier IC Precision Amplifiers SGL-Supply RR Lo Pwr FET-Inpt

FEATURES

• True single-supply operation
• Output swings rail-to-rail
• Input voltage range extends below ground Single-supply capability from 5 V to 30 V Dual-supply capability from ±2.5 V to ±15 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

APPLICATIONS

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

GENERAL DESCRIPTION

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.