AD557

a FEATURES Complete 8-Bit DAC Voltage Output—0 V to 2.56 V Internal Precision Band-Gap Reference Single-Supply Operation: +5 V (؎ 10%) Full Microprocessor Interface Fast: 1 ␮ s Voltage Settling to ؎1/2 LSB Low Power: 75 mW No User Trims Required Guaranteed Monotonic Over Temperature All Errors Specified TMIN to TMAX Small 16-Pin DIP or 20-Pin PLCC Package Low Cost DACPORT, Low-Cost Complete ␮P-Compatible 8-Bit DAC AD557 FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION PRODUCT HIGHLIGHTS The AD557 DACPORT® is a complete voltage-output 8-bit digital-to-analog converter, including output amplifier, full microprocessor interface and precision voltage reference on a single monolithic chip. No external components or trims are required to interface, with full accuracy, an 8-bit data bus to an analog system. The low cost and versatility of the AD557 DACPORT are the result of continued development in monolithic bipolar technologies. The complete microprocessor interface and control logic is implemented with integrated injection logic (I2L), an extremely dense and low-power logic structure that is process-compatible with linear bipolar fabrication. The internal precision voltage reference is the patented low-voltage band-gap circuit which permits full-accuracy performance on a single +5 V power supply. Thin-film silicon-chromium resistors provide the stability required for guaranteed monotonic operation over the entire operating temperature range, while laser-wafer trimming of these th...