The AD557 DACPORT® is a complete voltage output 8-bit digital-to-analog converter that integrates an output amplifier, a full microprocessor interface, and a precision reference on a single chip. No external components or adjustments are required to interface the 8-bit data bus with the analog system with full accuracy.
The low cost and versatile features of the AD557 DACPORT are the result of the continuous evolution of single-chip bipolar technology.
The complete microprocessor interface and control logic are implemented using integrated injection logic (I2L), an extremely high-density, low-power logic structure that is compatible with linear bipolar manufacturing processes. The internal precision reference is a patented low-voltage bandgap circuit that delivers full-accuracy performance from a single +5 V supply. Thin-film silicon-chromium resistors provide the stability needed for monotonic operation over the entire operating temperature range, and laser wafer adjustment of these thin-film resistors allows for factory absolute calibration within ±2.5 LSB, eliminating the need for gain or offset voltage adjustments. The new circuit design enables voltages to achieve ±1/2 LSB accuracy (full-scale stepping) within 800 ns.
The AD557 is available in two package configurations. AD557JN available in a 16-pin plastic, 0.3" wide DIP package. AD557JP is suitable for surface mount applications and is available in a 20-pin JEDEC standard PLCC package. Both devices have an operating temperature range of 0°C to +70°C.
DACPORT is a registered trademark of Analog Devices, Inc.