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64 ADCs on PXA255 !!

I need to interface a minimum of 32 (maximum of 64) 14-bit ADCs to an Intel PXA255 XScale processor. Each ADC is connected to an individual linear Hall Effect sensor. The sensors are distributed over an area of approx 2 sq metres. I want an ADC near each Sensor (for signal integrity reasons), so multi-channel ADCs are not suitable.

The PXA255 has I2C and SSP ports available.

Does anyone have any reccomendations on how I might best do this (taking into account signal integrity, loading, addressing issues,etc) ?

RR

Reply to
RR
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You'll need Serial ADCs - and some sort of a MUX scheme. One ADC candidate would be TI's new ADS1230

- specs 5MHz SLCK

Ideal would be SPI ADCs that can be wired in a daisy-chain loop, which would work very well with the SSP, but I don't recall seeing an ADC that is quite that clever.

-jg

Reply to
Jim Granville

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