Information
30
DIFFERENTIAL AMPLIFIERS
Teledyne LeCroy
Differential Amplier
and Accessory
Model Numbers:
DA1855A
DA1855-PR2
DA1855A-RM
DA1855A-PR2-RM
DSC5100
DXC100A
DXC200
DA101
DA1855A
The DA1855A is a stand-alone, high-performance 100 MHz differential
amplier. It is intended to act as a signal conditioning preamplier 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.
Amplier 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, amplier gain and attenuator settings, is automatically displayed.
The DA1855A features a built-in Precision Voltage Generator (PVG) that can
be set to any voltage between ±15.5 V (±10 V in Differential Offset) with up to
100 µV resolution. The PVG’s output can be selected as an input to the
inverting (-) input of the amplier for operation as a differential comparator,
or applied internally as a true differential offset voltage independent of
oscilloscope offset. The differential amplier is also available in a 2 channel
model. In addition, a rackmount is available for each model for easy
installation with other instruments.