SPISettings mySettings(16000, MSBFIRST, SPI_MODE2);

void initSPIforTLV5637(){
  SPI.begin();
  pinMode(DAC_CS, OUTPUT);
  digitalWrite(DAC_CS, HIGH); 
  SPI.setBitOrder(MSBFIRST);
  SPI.setDataMode(SPI_MODE2);
  SPI.setClockDivider(SPI_CLOCK_DIV2); 
  setIntRefTLV5637(0);
}