The AD7628 is an AD company's 8-bit digital-to-analog converter with excellent DAC-to-DAC matching. It uses a small 0.3-inch wide 20-pin DIP and 20-pin surface mount package. Each DAC has a separate on-chip latch to allow easy microprocessor interface. Data is transferred to either of the two DAC data latches through a common 8-bit TTL/CMOS compatible input port. The control input DAC A/DAC B determines which DAC is to be loaded. The AD7628's load cycle is similar to the write cycle of a random access memory, and the device is bus compatible with most 8-bit microprocessors, including 6502, 6809, 8085, Z80. The device operates from a +12 V to +15 V power supply and is TTL-compatible over this range. Power dissipation is a low 20 mW. Both DACs offer excellent four quadrant multiplication characteristics with a separate reference input and feedback resistor for each DAC.