MSK198RH M. S Kennedy, MSK198RH Datasheet - Page 4

• Manufacturer Part Number: MSK198RH
• Description: Rad Hard Dual Precision Op-amp
• Manufacturer: M. S Kennedy

SINGLE TO DIFFERENTIAL ADC DRIVER
convert a single analog signal into an ADC with differential inputs.
Some ADC's require an op amp to provide the appropriate gain and
offset to match the signal to the input range of the ADC. An ADC may
generate transient currents at their input due to the internal conver-
sion circuit, and these currents need to be isolated from the signal
source. The circuit in Figure 1 will provide a low impedance drive and
absorb these currents. The first op amp offsets the input signal 1.25V
while operating in unity gain. The output of the first op amp goes into
the IN+ of the ADC and the inverting input of the second op amp. The
second op amp inverts the signal around the 1.25VDC level applied to
its non-inverting input and the output is connected to the IN- of the
ADC. Optional filtering can be added to reduce high frequency noise
from the ADC inputs if required.
INSTRUMENTATION AMPLIFIER
fier can be designed with the MSK 198RH. Figure 2 shows a design
that offers sensitivity trim for offset voltage, CMRR and gain. The
circuit is configured for a differential input gain of 100.
A simple low cost, low power consumption instrumentation ampli-
The circuit shown in Figure 1 utilizes the MSK 198RH to buffer and
APPLICATION NOTES
FIGURE 1
FIGURE 2
4
4th ORDER BUTTERWORTH FILTER
order filter circuits. The circuit in Figure 3 shows a design that cas-
cades two 2nd order filters as a 100KHz 4th order low pass filter.
The design operates from a single supply. The filter offers a good
compromise for low parts count and performance with minimal over-
shoot and ringing characteristics that a Butterworth filter offers.
TOTAL DOSE RADIATION TEST
PERFORMANCE
Radiation performance curves for TID testing will be generated for all
radiation testing performed by MS Kennedy. These curves show per-
formance trends throughout the TID test process and will be located
in the MSK 198RH radiation test report. The complete radiation test
report will be available in the RAD HARD PRODUCTS section on the
MSK website.
ADDITIONAL APPLICATION INFORMATION
nology Corporation's® LT1498/1499 and RH1498 data sheets.
For additional applications information, please reference Linear Tech-
The wide bandwidth of the MSK 198RH is ideal for designing multi-
FIGURE 3
PRELIMINARY Rev. - 1/10