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// ADS7828 I2C address:- A0 = 0x49(73) & A1 = 0x4A(74) 
#define Addr 0x49

int raw_adc = 0;
double Current = 0;

void setup()
{
  // Set variable
  Particle.variable("Current", Current);
  
  // Initialize I2C communication as MASTER
  Wire.begin();

  // Initialize serial communication, set baud rate = 9600
  Serial.begin(9600);
  delay(300);
}

void loop()
{
  byte data[2];
  
  // Start I2C Transmission
  Wire.beginTransmission(Addr);

  // Send command byte
  // Single Ended inputs
  // Channel: 0 (zero) selected
  // Internal Reference ON and A/D Converter ON
  Wire.write(0x9C);

  // Stop I2C transmission
  Wire.endTransmission();
  
  // Request 2 bytes of data
  Wire.requestFrom(Addr, 2);
   //Particle.publish("Digital: ", "read two bytes");
  
  // Read 2 bytes of data
  // raw_adc msb, raw_adc lsb
  if(Wire.available() == 2)
  {
    Particle.publish("Digital: ", "after two bytes read");
    data[0] = Wire.read();
    data[1] = Wire.read();
    
    // Output data to dashboard
    Particle.publish("data D0: ", String(data[0]));
    Particle.publish("data D1: ", String(data[1]));

    // Converting the data to 12 bits
    int raw_adc = ((data[0] & 0x0F) * 256) + data[1];
    double Voltage = raw_adc * 0.0012207;
    Particle.publish("Digital: ", String(Voltage));

    // 1 sec delay
    delay(1000);
  }
  else
    Particle.publish("Digital: ", "Not available");
}

NOTE: I used both options but I am getting wrong values