The ADC has an SPI-compatible, bidirectional serial interface that is used to read the conversion data as well as configure and control the ADC. The serial interface consists of four control lines: CS, SCLK, DIN, and DOUT/DRDY. If the ADS1262 or ADS1263 is the only device connected to the SPI bus, the CS input can be tied low, resulting in a minimum of three control signals for communications: SCLK, DIN, and DOUT/DRDY. The ADC has a data ready output signal (DRDY) that asserts regardless of interface selection. The DRDY functionality is also integrated with the DOUT/DRDY pin.