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ltc2400

I am having trouble in testing 24 bit LTC2400 ADC. The data sheet specifies free running mode, where ADC generates serial clock along with data if chip select in permanently grounded. I tried to do so and I see no pulses at all.I have followed the same schematics/layout recommended in eval board. FO is pulled to +5V and SCK/SDO is connected to scope. CS is permanently grounded