MAX551

19-1260; Rev 0; 10/97 +3V/+5V, 12-Bit, Serial, Multiplying DACs in 10-Pin µMAX Package _______________General Description The MAX551/MAX552 are 12-bit, current-output, 4-quadrant multiplying digital-to-analog converters (DACs). These devices are capable of providing unipolar or bipolar outputs when operating from either a single +5V (MAX551) or +3V (MAX552) power supply. An internal power-on-reset circuit clears all DAC registers on power-up, setting the DAC output voltage to 0V. The SPI™/QSPI™ and Microwire™-compatible 3-wire serial interface saves board space and reduces power dissipation compared with parallel-interface devices. The MAX551/MAX552 feature double-buffered interface logic with a 12-bit input register and a 12-bit DAC register. Data in the DAC register sets the DAC output voltage. Data is loaded into the input register via the serial interface. The LOAD input transfers data from the input register to the DAC register, updating the DAC output voltage. The MAX551/MAX552 are available in an 8-pin DIP package or a space-saving 10-pin µMAX package. The µMAX package provides an asynchronous clear (CLR) input that clears all DAC registers when pulled to GND, setting the output voltage to 0V. ____________________________Features o Single-Supply Operation: +4.5V to +5.25V (MAX551) +2.7V to +3.6V (MAX552) o 12.5MHz 3-Wire Serial Interface o SPI/QSPI and Microwire Compatible o Power-On Reset Clears DAC Output to Zero o Asynchronous Clear Input Clears DAC Output to Zero...