Can you confirm if you need 1MSPS from all 4 channels in parallel or if you need a 1MSPS sampling rate divided by the four channels? ADS8594 has 4ADCs in parallel @ 500kSPS ADS8694 has 4ADCs MUX'ed @ 500kSPS ADS9224R is 2ADCs @3MSPS and you could use two of these devices.
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