I have bought a few ADCs from http://www.ti.com/product/ADS131E04 and I cannot get hear from them via the SPI.
I am putting the ADC in a TQFP socket and I connect the PWDN, RESET, SCLK, CS, DIN, and DOUT signals to the respective pins of an Arduino Due microcontroler (3.3V). I am also powering via DVDD and grounding via DGND. This should be enough for me to read a register so I can see that the SPI communication with the ADC is working. Unfortunately I don't hear back from the chip. The SPI read register request is sent to the ADC but the chip does not reply back. I have tried almost everything, including manually generating the SPI waveform. I am checking everything with a scope and a logic analyzer. I simply don't know how to get this working.
Edit 1: Thanks to everybody for giving suggestions. Today I have redone all wiring and I made sure that the power-up is fine. I measured VCAP1 and it gets to approx. 1.3V, so the analogue power-up is OK. I checked all CLK and SCLK requirements and they seem fine. This is a screenshot of the logic analyzer: