AD743

Ultralow Noise BiFET Op Amp AD743 FEATURES Ultralow Noise Performance 2.9 nV/√Hz at 10 kHz 0.38 ␮V p-p, 0.1 Hz to 10 Hz 6.9 fA/√Hz Current Noise at 1 kHz Excellent DC Performance 0.5 mV Max Offset Voltage 250 pA Max Input Bias Current 1000 V/mV Min Open-Loop Gain AC Performance 2.8 V/␮s Slew Rate 4.5 MHz Unity-Gain Bandwidth THD = 0.0003% @ 1 kHz Available in Tape and Reel in Accordance with EIA-481A Standard APPLICATIONS Sonar Preamplifiers High Dynamic Range Filters (>140 dB) Photodiode and IR Detector Amplifiers Accelerometers GENERAL DESCRIPTION The AD743 is an ultralow noise, precision, FET input, monolithic operational amplifier. It offers a combination of the ultralow voltage noise generally associated with bipolar input op amps and the very low input current of a FET input device. Furthermore, the AD743 does not exhibit an output phase reversal when the negative common-mode voltage limit is exceeded. The AD743’s guaranteed, maximum input voltage noise of 4.0 nV/√Hz at 10 kHz is unsurpassed for a FET input monolithic op amp, as is the maximum 1.0 µV p-p, 0.1 Hz to 10 Hz noise. The AD743 also has excellent dc performance with 250 pA maximum input bias current and 0.5 mV maximum offset voltage. The AD743 is specifically designed for use as a preamp in capacitive sensors, such as ceramic hydrophones. The AD743J is rated over the commercial temperature range of 0°C to 70°C. The AD743 is available in a 16-lead SOIC and 8-lead PDIP. PRODUCT HIGHLIGHTS 1. The low offset vol...