Pmod AD5 4-channel 4.8 kHz 24-bit A/D Converter

Hello Everyone,

I am trying to interface the Pmod AD5 4-channel 4.8 kHz 24-bit A/D Converter to my own designed Arduino UNO board based on the Atnega328P chip via SPI ports but it is not working at all. However, the Pmod AD5 4-channel 4.8 kHz 24-bit A/D Converter works fine with normal Arduino Uno (brought from Arduino.cc). Actually, my own designed board hardware is exactly the same on the normal Arduino UNO. Any suggestion would be very helpful. Thanks