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OPT3101EVM: What is the Speed of light value of Output Data Equation.

Part Number: OPT3101EVM

Hi. everyone.

I'm using the OPT3101EVM. 

There is an equation about distance in the datasheet. 

What is the "c", speed of light value in the datasheet? The distance equation is (PHASE_OUT/2^16)/(c/10Mhz) meters.

Our solution is that measure the distance of hot Slab which is a high temperature. (Max 400℃) 

Is it possible to measure the hot slab?

Best

Regrads