原标题：Maxim MAX5717/MAX5719 16位和20位DAC解决方案

　　Maxim公司的MAX5717/MAX5719是串行输入无缓冲16位和20位电压输出单极数模转换器(DAC),集成的反馈电阻和外接运放一起可用作双极工作,±4 LSB INL (Max, 16位), ±0.5 LSB DNL (Max, 16位),稳定时间750ns,输出噪音密度6 nv/√Hz,工作电压4.5V-5.5V,50MHz 3线SPI接口,主要用在测试和测量设备,自动测试设备(ATE),数据采集系统,过程控制和伺服回路,可编电压和电流源以及通信系统等.本文介绍了MAX5717/MAX5719优势和特性,框图和应用电路,以及MAX5717/MAX5719评估板主要特性,电路图,材料清单和PCB设计图.

　　The MAX5717 and MAX5719 are serial-input, unbuffered16 and 20-bit voltage-output unipolar digital-to-analogconverters (DACs) with integrated feedback resistorsthat allow bipolar operation when used with an externaloperational amplifier. These DACs provide low glitchenergy, low noise, tight bipolar resistor matching, and highaccuracy. The DACs feature ±4LSB INL (max, 16-bit) overthe temperature range of -40℃ to +105℃. Integratedprecision setting resistors make the DACs easy to use.

　　The MAX5717 and MAX5719 feature a 50MHz, 3-wireSPI™, QSPI™, MICROWIRE™, and DSP-compatibleserial interface.On power-up,the output resets to zero-scale, providingadditional safety for applications which drive valves orother transducers that need to be off on power-up. TheDAC output settles in 750ns and has a low offset andgain drift of ±0.1 ppm/℃ of FSR.

　　The MAX5717 is functionally similar to the MAX542,but with significantly faster settling time. The MAX5719provides a similar speed improvement as well as anincrease in resolution to 20 bits.

　　MAX5717/MAX5719优势和特性:

　　●● 16 and 20-bit resolution

　　●● ±4 LSB INL (Max, 16-bit)

　　●● ±0.5 LSB DNL (Max, 16-bit)

　　●● 750ns settling time (typ)

　　●● 0.05 nV-sec glitch energy

　　●● 6 nv/√Hz Output Noise Density

　　●● Integrated ±0.025% (max) Bipolar Setting Resistors

　　●● 4.5V to 5.5V Supply Range

　　●● 4.0V to VDD Reference Input Range

　　●● Safe Power-Up Reset-to-Zero-Scale DAC Output(Unipolar)

　　●● 50MHz 3-Wire SPI Interface

　　●● -40℃ to +105℃ Operating Temperature Range.

　　●● SO-14 Package

　　MAX5717/MAX5719应用:

　　●● Test and Measurement Equipment

　　●● Automatic Test Equipment

　　●● Gain and Offset Adjustment

　　●● Data-Acquisition Systems

　　●● Process Control and Servo Loops

　　●● Portable Instrumentation

　　●● Programmable Voltage and Current sources

　　●● Automatic Tuning

　　●● Communication Systems

　　图1.MAX5717/MAX5719简化框图

　　图2.单个双极输出电路图

　　图3.双极输出电路图

　　图4.采用基准电压的双极输出电路图

　　MAX5717/MAX5719评估板

　　demonstrates the MAX5717/MAX5719, 16/20-bit DAC. TheEV kit includes a graphical user interface (GUI) that providescommunication over SPI with an on-board master IC.The MAX5717 EV kit comes with the MAX5717GSD+installed and the MAX5719 comes with the MAX5719GSD+installed.

　　MAX5717/MAX5719评估板主要特性:

　　●● On-Board SPI Controller

　　●● On-Board Output Buffer (MAX9632)

　　●● On-Board +4.096V Reference Voltage (MAX6126)

　　●● Windows XP®, Windows® 7/8/8.1/10-Compatible Software

　　图5.MAX5717/MAX5719评估板外形图

　　图6.MAX5717/MAX5719评估板电路图(1)

　　图7.MAX5717/MAX5719评估板电路图(2)

　　MAX5717/MAX5719评估板材料清单:

　　详情请见:

MAX5717-MAX5719.pdf

MAX5717EVKIT-MAX5719EVKIT.pdf