Ultralow Noise Precision High Speed Op Amps

The RH1028 (gain of -1 stable) /RH1128 (gain of +1 stable) achieve a new standard of excellence in noise performance with 0.9nV/√Hz 1kHz noise, 1.0nV/√Hz 10Hz noise. This ultralow noise is combined with excellent high speed specifications (gain-bandwidth product is 75MHz for RH1028, 20MHz for RH1128), distortion-free output, and true precision parameters (0.25μV/°C drift, 20μV offset voltage, 25 million voltage gain). Although the RH1028/RH1128 input stage operates at nearly 1mA of collector current to achieve low voltage noise, input bias current is only 50nA.

The RH1028/RH1128’s voltage noise is less than the noise of a 50Ω resistor. Therefore, even in very low source impedance transducer or audio amplifier applications, the RH1028/RH1128’s contribution to total system noise will be negligible.

Applications

* Low Noise Frequency Synthesizers

* Infrared Detectors

* Accelerometer and Gyro Amplifiers

* 350Ω Bridge Signal Conditioning

* Voltage Noise

* 1.6nV/rt Hz Max. at 1kHz

* 0.9nV/rt Hz Typ. at 1kHz

* 4.7nV/ rtHz Typ. at 10Hz

* Gain-Bandwidth Product

* RH1028: 50MHz Min.

* RH1128: 11MHz Min.

* Slew Rate

* RH1028: 11V/µs Min.

* RH1128: 4.5V/µs Min.

* Offset Voltage: 80µV Max.

* Drift with Temperature: 1.0µV/°C Max.

* Voltage Gain: 5 Million Min.