From Manuals

Digital to Analog Converter (dac_ssi)

Compatibility Eagle 50, 50E, 100 with IO plus

The I/O Plus option of the Eagle controller line includes four 10-bit DACs via the SSI serial synchronous interface with a maximum sample rate of 500 kilo-samples/sec (kSPS). These signals are available in the following headers:

This example shows how to use the DAC to generate triangle and square waves. The signal output is shown below. In integer format the 10-bit outputs go between 0 and 1023 (0x03FF) for the range 0.00V to 3.30V in steps of 3.22 mV. Op-amps or other alternatives should be used to implement scaling and isolation.