The AD5544/AD5554 quad， 16-/14-bit， current output， digitalto-analog converters （DACs） are designed to operate from a 2.7 V to 5.5 V supply range. The applied external reference input voltage （VREFx） determines the full-scale output current. Integrated feedback resistors （RFB） provide temperature-tracking， full-scale voltage outputs when combined with an external I-to-V precision amplifier. A double-buffered serial data interface offers high speed， 3-wire， SPI- and microcontroller-compatible inputs using serial data in （SDI）， a chip select （CS）， and clock （CLK） signals. In addition， a serial data out pin （SDO） allows for daisy-chaining when multiple packages are used. A common， level-sensitive， load DAC strobe （LDAC） input allows the simultaneous update of all DAC outputs from previously loaded input registers. Additionally， an internal power-on reset forces the output voltage to 0 at system turn-on. The MSB pin allows system reset assertion （RS） to force all registers to zero code when MSB = 0 or to half-scale code when MSB = 1. The AD5544 is packaged in the compact 28-lead SSOP and 32-lead LFCSP. The AD5554 is packaged in the compact 28-lead SSOP. The EV-AD5544/45SDZ is available for evaluating DAC performance. For more information， see the UG-285 evaluation board user guide.