DAC1232 Datasheet | National Semiconductor

Description 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 patibility The DAC1208 series and DAC1230 series are the 12-bit members of a family of microprocessor patible DACs (MICRO-DACs TM) For applications requiring other resolutions the DAC1000 series for 10-bit and DAC0830 series for 8-bit are available alternatives Features Y Linearity specified with zero and full-scale adjust only Y Direct interface to all popular microprocessors Y Double-buffered single-buffered or flow through digital data inputs Y Logic inputs which meet TTL voltage level specs (1 4V logic threshold) Y Works with g10V reference full 4-quadrant multiplication Y Operates stand-alone (without m P) if desired Y All parts guaranteed 12-bit monotonic Y DAC1230 series is pin patible with the DAC0830 series 8-bit MICRO-DACs Key Specifications Y Current Settling Time Y Resolution Y Linearity (Guaranteed over temperature) Y...