SLAS465 – JUNE 2005
External reference input and power supply
Ground for signal and power supply. All analog and digital signals are referred with respect to this pin.
Analog signal input
Serial clock input. This clock is used for clocking data out, and it is the source of conversion clock.
This is the serial data output of the conversion result. The serial stream comes with MSB first. The MSB is clocked out
(changed) on the falling edge one SCLK after the sampling period ends. This results in four leading zeros after CS
becomes active. SDO is 3-stated once all the valid bits are clocked out (12 for ADS7866, 10 for ADS7867, and 8 for
This is an active low input signal. It is used as a chip select to gate the SCLK input, to initiate a conversion, and to
frame output data.