The DAC1208 and the DAC1230 series are 12-bit multiplying D to A converters designed to interface directly with a wide variety of microprocessors (8080 8048 8085 Z-80 etc ) Double buffering input registers and associated control lines allow these DACs to appear as a two-byte ``stack'' in the system's memory or I O space with no additional interfacing logic required The DAC1208 series provides all 12 input lines to allow single buffering for maximum throughput when used with 16-bit processors These input lines can also be externally configured to permit an 8-bit data interface The DAC1230 series can be used with an 8-bit data bus directly as it internally formulates the 12-bit DAC data from its 8 input lines All of these DACs accept left-justified data from the processor The analog section is a precision silicon-chromium (Si-Cr) R-2R ladder network and twelve CMOS current switches An inverted R-2R ladder structure is used with the binary weighted currents switched between the IOUT1 and IOUT2 maintaining a constant current in each ladder leg independent of the switch state Special circuitry provides TTL logic input voltage level compatibility The DAC1208 series and DAC1230 series are the 12-bit members of a family of microprocessor compatible DACs (MICRO-DACsTM ) For applications requiring other resolutions the DAC1000 series for 10-bit and DAC0830 series for 8-bit are available alternatives