Is DDC232 work properly when the input signal is negitive current?

hb liu

Other Parts Discussed in Thread: DDC232

I am building a X-ray monitor by using a gas ionized detector and DDC232 as front end. The dector output is negitive current. Can DDC232 work with it?

over 14 years ago

0 Jason Bridgmon over 14 years ago

TI__Genius 14825 points

Depending on the nature of the source, it may be possible to apply the technique detailed in this application note to create a bipolar input range for the DDC232 using passive components to provide an offset which is summed on the input node of the integrator, allowing for negative currents.

Creating a Bipolar Input Range for the DDC112

Otherwise, per the data sheet, the DDC232 can only accommodate -0.4% of the selected full scale range, which in the largest (350pC) range would only be -1.4pC.

0 hb liu over 14 years ago in reply to Jason Bridgmon

Prodigy 20 points

Thanks a lot !

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Is DDC232 work properly when the input signal is negitive current?