PRODUCT DESCRIPTION

The AD546 is a monolithic electrometer combining the virtues of low (1 pA) input bias current with the cost effectiveness of a plastic mini-DIP package. Both input offset voltage and input offset voltage drift are laser trimmed, providing very high perfor mance for such a low cost amplifier.

Input bias currents are reduced significantly by using “topgate” JFET technology. The 1015 Ω common-mode impedance, resulting from a bootstrapped input stage, insures that input bias current is essentially independent of common-mode voltage variations.

FEATURES

DC PERFORMANCE

1 mV max Input Offset Voltage

Low Offset Drift: 20 mV/8C

1 pA max Input Bias Current

Input Bias Current Guaranteed Over Full Common-Mode Voltage Range

AC PERFORMANCE

3 V/ms Slew Rate

1 MHz Unity Gain Bandwidth

Low Input Voltage Noise: 4 mV p-p, 0.1 Hz to 10 Hz

Available in a Low Cost, 8-Pin Plastic Mini-DIP

Standard Op Amp Pinout

APPLICATIONS

Electrometer Amplifiers

Photodiode Preamps

pH Electrode Buffers

Log Ratio Amplifiers