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LTC1968 Production
The LTC1968 is a true RMS-to-DC converter that uses an innovative delta-sigma computational technique. The benefits of the LTC1968 proprietary architecture...
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LTC1968 on Analog.com

LT1494 Production
The LT1494/LT1495/LT1496 are the lowest power (IS = 1.5µA) op amps with precision specifications. The extremely low supply current is combined with excellent...
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LT1494 on Analog.com

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The output of the buffered post filter in LTC1968 is incorrect

zhejiang

on Nov 27, 2023

Category: Hardware

Product Number: LTC1968

Tested using ADI's LTC1968 development board, a 460KHz sine wave signal with an RMS of around 350mV was inputted, and after passing through LTC1968, it was found to be correct. But after adding a buffered post filter, the output result turned out to be around 5V.

What's going on?

ADIApproved

on Nov 27, 2023 7:55 PM
0
I think you must have built the post filter incorrectly. The filters in the datasheet are drawn correctly.
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ADIApproved

on Nov 27, 2023 10:09 PM
0
Perhaps try probing the LT1494 output (at E8) through a 10k resistor. LT1494 is an ultra-low power opamp and may be having trouble in a high EMI environment.
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The output of the buffered post filter in LTC1968 is incorrect