PRODUCT DESCRIPTION

The AD645 is a low noise, precision FET input op amp. It offers the pico amp level input currents of a FET input device coupled with offset drift and input voltage noise comparable to a high performance bipolar input amplifier.

FEATURES

Improved Replacement for Burr-Brown

OPA-111 and OPA-121 Op Amp

LOW NOISE

2 μV p-p max, 0.1 Hz to 10 Hz

10 nV/√Hz max at 10 kHz

11 fA p-p Current Noise 0.1 Hz to 10 Hz

HIGH DC ACCURACY

250 μV max Offset Voltage

1 μV/°C max Drift

1.5 pA max Input Bias Current

114 dB Open-Loop Gain

Available in Plastic Mini-DIP, 8-Pin Header Packages, or Chip Form

APPLICATIONS

Low Noise Photodiode Preamps

CT Scanners

Precision I-V Converters