3V/+5V, 12-Bit, Serial, Multiplying DACs in 10-Pin µMAX Package

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 through the serial interface. The active-low 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-bar) input that clears all DAC registers when pulled to GND, setting the output voltage to 0V.

Applications

* µP-Controlled Systems * Automatic Calibration * Digitally Controlled Filters * Gain Adjustment * Motion-Controlled Systems * Process-Control I/O Boards * Programmable Amplifiers/Attenuators * Transducer Drivers

* Single-Supply Operation:

* +4.5V to +5.25V (MAX551)

* +2.7V to +3.6V (MAX552)

* 12.5MHz 3-Wire Serial Interface

* SPI/QSPI and MICROWIRE Compatible

* Power-On Reset Clears DAC Output to Zero

* Asynchronous Clear Input Clears DAC Output to Zero

* Voltage Mode or Bipolar Mode Operation with a Single Power Supply

* Schmitt-Trigger Digital Inputs for Direct Optocoupler Interface

* 0.4µA Supply Current

* 10-Pin µMAX Package