16 Channels of 15V Analog Inputs... Any Suggestions?

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KeithRB:
Is 10 bits (1024 steps) not enough? 12 bits places a lot more effort on you rpart to get everything just right.

IF 10 bits is enough than some of these:
Analog to Digital Converter - MCP3002 - COM-08636 - SparkFun Electronics

Along with your analog inputs should work.

You can also google 12 bit ADC SPI

That's not 15V compatible.

That's the big issue. But we need more info about signal source before choosing an appropriate method of handling the signals - high impedance? low impedance? Definitely within the 0..15V range?

Clearly an analog multiplexer good for 15V would be a start (the original CMOS 4000 series can do that I think). But converting down to 5V needs either an active or passive attenuator circuit. And up-converting the signals to drive the analog multiplexer might be needed. I feel there is probably a modern 16way analog multiplexer that can handle 15V analog and use 5V digital - might be surface-mount though.