12位Low Power四路电压输出DAC与串行接口MAX5742

　　The MAX5742 quad， 12-bit， low-power， buffered voltage-output， digital-to-analog converter （DAC） is packaged in a space-saving 10-pin µMAX package （5mm ✕ 3mm）。 The wide supply voltage range of +2.7V to +5.5V and 229µA supply current accommodates lowpower and low-voltage applications. DAC outputs employ on-chip precision output amplifiers that swing Rail-to-Rail®。 The MAX5742’s reference input accepts a voltage range from 0 to VDD. In power-down the reference input is high impedance， further reducing the system’s total power consumption. The 20MHz， 3-wire SPI™， QSPI™， MICROWIRE™ and DSP-compatible serial interface saves board space and reduces the complexity of opto- and transformerisolated applications. The MAX5742 on-chip power-on reset （POR） circuit resets the DAC outputs to zero and loads the output with a 100kΩ resistor to ground. This provides additional safety for applications that drive valves or other transducers that need to be off on power-up. The MAX5742’s software-controlled powerdown reduces supply current to less than 0.3µA and provides software-selectable output loads （1kΩ， 100kΩ， or high impedance） while in power-down. The MAX5742 is specified over the -40°C to +125°C automotive temperature range.