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Full control from oscilloscope through ProBus interface
DC to 100 MHz bandwidth
Outstanding 100,000: 1 Common Mode Rejection Ratio (CMRR)
Gain of X1 or X10
Industry-leading overdrive recovery
Low noise
Selectable BW limiting
Two gain control modes when connected to a LeCroy oscilloscope
Built-in Precision Voltage Generator (PVG)
Comparator and true differential offset modes

The DA1855A is a stand-alone, high-performance 100 MHz differential amplifier. It is intended to act as a signal conditioning preamplifier for oscilloscopes, digitizers and spectrum analyzers, providing differential measurement capability to instruments having only a single-ended input. When used with a DA1855A, oscilloscopes can obtain Common Mode Rejection Ratio (CMRR) and overdrive recovery performance levels previously unobtainable.

Amplifier gain can be set to 1 or 10. A built-in input attenuator can be separately set to attenuate signals by a factor of 10, providing gains of 10, 1, or 0.1 and common mode dynamic range of ±15.5 V (÷1) or ±155 V (÷10). Optional probes increase the maximum input signal and common mode ranges in proportion to their attenuation ratio but do not exceed their maximum input voltage rating. Effective gain of the DA1855A, including probe attenuation, amplifier gain and attenuator settings, is automatically displayed.