ADS7066: SPI Communication between Arduino Uno and ADS7066

Hi I am trying to do SPI comm. between ADC7066 and Arduino Uno. I am giving 2V from the external Power supply to the CH1 (AIN1) but  getting some random data on SDO. I am using manual mode and SPI mode 0.

Connections:

Arduino CODE:

#include <SPI.h>

const int CS = 10;
uint32_t ADC_GET(int CS);
#define DELAYTIME 2 //delay, in seconds

void setup(){

pinMode(13, OUTPUT); //SPI SCK
pinMode(11, OUTPUT); //SPI MOSI
pinMode(12, INPUT); //SPI MISO

pinMode (CS, OUTPUT);
digitalWrite(CS, HIGH);
SPI.begin();
SPI.setBitOrder(MSBFIRST);
SPI.setDataMode(SPI_MODE0);
SPI.setClockDivider(SPI_CLOCK_DIV2);
Serial.begin(9600);

}

void loop() {

uint8_t RD_REG = 0b00010000;
uint8_t Add = 0x11;
uint8_t Data = 0x00;
digitalWrite(CS, LOW);
SPI.transfer(WR_REG);
SPI.transfer(0b00010001);
SPI.transfer(Data);
digitalWrite(CS, HIGH);
uint32_t data = (RD_REG)+(Add)+ (Data); //combine bytes, scale 32bit to 24bit
return data;

delay(5000);

}