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AD630 replacement for water probe?

Dear All,

For a probe that reads the reflections of water particles into water (water turbidity) I am using AD630 as an ADC. Any TI p/n that can replace this?

I need to capture a reflected light signal starting from zero and with a high noise, the more I disconnect the signal from the noise the more I can go down to the bottom in the measurement.
The sore point is the ac / dc conversion, for the moment, I used the AD630 in the Lock-in Amp configuration to not use a uC (like MSP430) and write SW pages ...
Do you have any ideas about it?

Many Thanks,

Antonio

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