The PB-DAC3 is a 4 channel 12-bit opto-isolated D/A piggyback for use with ModPack carrier boards. All outputs are independent and galvanically isolated from the system supply. Bipolar or unipolar conversion is indicated by the version being ordered. Board specific calibration data remain stored in an on-board EEPROM for software gain/offset correction. The PB-DAC3 has software support for both OS9 and VxWorks.