[原创] ADI AD5770R六路14位低噪音DAC光学控制应用方案

ADI公司的AD5770R是六路14位分辨率低噪音可编电流输出的数模转换器(DAC)光学控制应用器件,采用1.25V片上基准电压,2.5 kΩ精密电阻作为基准电流产生,芯片温度,输出监测功能,故障告警和重置功能.AD5770R包含5个14位分辨率电流源DAC通路和一个14位分辨率电流源和沉的DAC通路:通路0可配置成多达60mA的沉和多达300mA的源,而通路1到5有多个可编输出电流源范围由寄存器存储来定;每个DAC工作在0.8V到AVDD -0.4V电源轨内,以优化电源效率和热消耗.AD5770R工作电压从2.9V到5.5V AVDD电源,工作温度−40℃到+105℃,具有SPI接口,主要工作在光学控制,LED驱动器可编电流源和电流模式偏置.本文介绍了AD5770R主要特性,功能框图以及评估板EVAL-AD5770RSDZ主要特性,加电图和电路图以及材料清单.

The AD5770R is a 6-channel, 14-bit resolution, low noise, programmable current output, digital-to-analog converter (DAC) for photonics control applications. The device incorporates a 1.25 V, on-chip voltage reference, a 2.5 kΩ precision resistor for reference current generation, die temperature, output monitoring functions, fault alarm, and reset functions.

The AD5770R contains five 14-bit resolution current sourcing DAC channels and one 14-bit resolution current sourcing and sinking DAC channel.

Channel 0 can be configured to sink up to 60 mA and source up to 300 mA. Channel 1 to Channel 5 have multiple programmable output current sourcing ranges set by register access.
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