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LT1028 - Ultra Low Noise Precision High Speed Op Amps

The LT1028 (gain of –1 stable)/LT1128(gain of +1 stable) achieve a new standard of excellence in noise performance with 0.85nV/Rt.Hz 1kHz noise, 1.0nV/Rt.Hz 10Hz noise. This ultralow noise is combined with excellent high speed specifications (gain-bandwidth product is 75MHz for LT1028, 20MHz for LT1128), distortion-free output, and true precision parameters (0.1µV/°C drift, 10µV offset voltage, 30 million voltage gain). Although the LT1028/LT1128 input stage operates at nearly 1mA of collector current to achieve low voltage noise, input bias current is only 25nA.

The LT1028/LT1128’s voltage noise is less than the noise of a 50 Ohm resistor. Therefore, even in very low source impedance transducer or audio amplifier applications, the LT1028/LT1128’s contribution to total system noise will be negligible.

Features Voltage Noise 1.1nV/rt Hz Max. at 1kHz 0.85nV/rt Hz Typ. at 1kHz 1.0nV/ rtHz Typ. at 10Hz 35nVP-P Typ., 0.1Hz to 10Hz Gain-Bandwidth Product LT1028: 50MHz Min. LT1128: 13MHz Min. Slew Rate LT1028: 11V/µs Min. LT1128: 5V/µs Min. Offset Voltage: 40µV Max. Drift with Temperature: 0.8µV/°C Max. Voltage Gain: 7 Million Min. Voltage and Current Noise 100% Tested Available in 8-Pin SO Package Typical Application

Applications Low Noise Frequency Synthesizers High Quality Audio Infrared Detectors Accelerometer and Gyro Amplifiers 350 ohms Bridge Signal Conditioning Magnetic Search Coil Amplifiers Hydrophone Amplifiers Packaging

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