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SERIAL PORT INTERFACE (SPI)
The serial port of the AD9874 has 3-wire or 4-wire SPI capability,
allowing read/write access to all registers that configure the
device’s internal parameters. The default 3-wire serial communication
port consists of a clock (PC), peripheral enable (PE), and
bidirectional data (PD) signal. The inputs to PC, PE, and PD
contain a Schmitt trigger with a nominal hysteresis of 0.4 V
centered about the digital interface supply (i.e., VDDH/2).
A 4-wire SPI interface can be enabled by setting the MSB of the
SSICRB register (Reg. 0x19, Bit 7), resulting in the output data
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