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Is a replacement for the LOGDAC AD7111 ?

Question asked by eddyatpessac on Jan 18, 2016
Latest reply on Jan 25, 2016 by eddyatpessac

Hello, everybody.

I need to redesign a hardware composed with a variable (0/+80db) amplifier stage with a LOGDAC AD7111 followed by a 16 bits ADC AD7722. 

The signal frequency is around 5Khz. I don't find any modern replacement for the AD7111. Is there another solution to replace this design ?

The goal of this design is to measure the reflected IR signal by a photodiode from very dark material and from very reflectif white material.

With a optical reference chanel, the processor adjust the first amplifier stage from +0 to +80dB with the AD7111 and then measure the signal with the 16 bits range precision of the second stage.

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