The LT1028(gain of –1 stable)/LT1128(gain of +1 stable)achieve a new standard of excellence in noise performancewith 0.85nV/√Hz 1kHz noise, 1.0nV/√Hz 10Hz noise. Thisultra low noise is combined with excellent high speedspecifications (gain-bandwidth product is 75MHz forLT1028, 20MHz for LT1128), distortion-free output, andtrue precision parameters (0.1µV/°C drift, 10µV offsetvoltage, 30 million voltage gain). Although the LT1028/LT1128 input stage operates at nearly 1mA of collectorcurrent to achieve low voltage noise, input bias current isonly 25nA.The LT1028/LT1128’s voltage noise is less than the noiseof a 50Ω resistor. Therefore, even in very low sourceimpedance transducer or audio amplifier applications, theLT1028/LT1128’s contribution to total system noise willbe negligible.
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