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Maxim 公司的MAX5214/MAX5216是14位/16位單路低功耗電壓輸入的數模轉換器(DAC),工作電壓2.7V-5.25V,MAX5214的相對精度±0.25 LSB INL, MAX5216的相對精度±1.0 LSB INL,具有50MHz, 3線SPI/QSPI/MICROWIRE兼容的接口,主要用于2線傳感器,通信系統,過程控制和伺服回路,手提儀表,功率放大器控制,可編電壓和電流源.本文介紹了MAX5214/MAX5216主要特性,功能框圖,典型應用電路圖以及評估板MAX5214DACLite主要特性,電路圖和材料清單,PCB元件布局圖. The MAX5214/MAX5216 are pin-compatible, 14-bit and 16-bit digital-to-analog converters (DACs). The MAX5214/MAX5216 are single-channel, low-power, buff-ered voltage-output DACs. The devices use a precision external reference applied through the high resistance input for rail-to-rail operation and low system power consumption. The MAX5214/MAX5216 accept a wide 2.7V to 5.25V supply voltage range. Power consump-tion is extremely low to accommodate most low-power and low-voltage applications. These devices feature a 3-wire SPIK-/QSPIK-/MICROWIREK-/DSP-compatible serial interface to save board space and to reduce the complexity in isolated applications. The MAX5214/ MAX5216 minimize the digital noise feedthrough from input to output with SCLK and DIN input buffers pow-ered down after completion of each serial input frame. On power-up, the MAX5214/MAX5216 reset the DAC output to zero, providing additional safety for applica-tions that drive valves or other transducers that need to be off on power-up. The DAC output is buffered resulting in a low supply current of 80FA (max) and a low offset error of Q0.25mV. A zero level applied to the CLR pin asynchronously clears the contents of the input and DAC registers and sets the DAC output to zero independent of the serial interface. The MAX5214/ MAX5216 are available in an ultra-small (3mm x 3mm), 8-pin FMAX® package and are specified over the -40NC to +105NC extended industrial temperature range. MAX5214/MAX5216主要特性: Low-Power Consumption (80μA max) 14-/16-Bit Resolution in a 3mm x 3mm, 8-Pin μMAX Package Relative Accuracy ±0.25 LSB INL (MAX5214, 14-Bit) ±1.0 LSB INL (MAX5216, 16-Bit) Guaranteed Monotonic Over All Operating Ranges Low Gain and Offset Error Wide 2.7V to 5.25V Supply Range Rail-to-Rail Buffered Output Operation Safe Power-On Reset (POR) to Zero DAC Output Fast 50MHz, 3-Wire, SPI/QSPI/MICROWIRE-Compatible Serial Interface Schmitt-Trigger Inputs for Direct Optocoupler Interface Asynchronous CLR Clears DAC Output to Code 0 High Reference Input Resistance for Power Reduction Buffered Voltage Output Directly Drives 10kI Loads MAX5214/MAX5216應用: 2-Wire Sensors Communication Systems Automatic Tuning Gain and Offset Adjustment Power Amplifier Control Process Control and Servo Loops Portable Instrumentation Programmable Voltage and Current Sources Automatic Test Equipment 
圖1.MAX5214/MAX5216功能框圖
圖2.MAX5214/MAX5216典型應用電路圖 評估板MAX5214DACLite The MAX5214DACLite evaluation kit (EV kit) enables evaluation of the MAX5214 single-channel, low-power, buffered-output, 3-wire SPI interface 14-bit DAC. The EV kit also includes Windows XPM-, Windows VistaM-, and WindowsM 7-compatible software that provides a simple graphical user interface (GUI) for exercising the features of the IC. 評估板MAX5214DACLite主要特性: USB Powered, No Additional Supply Needed* (Cable Not Included) 3.3V Fixed VDD from On-Board LDO (MAX8510) 3.000V On-Board Precise Voltage Reference (MAX6133) Direct USB Communication through the MAXQ622 Microcontroller Windows XP-, Windows Vista-, and Windows 7 (32-bit)-Compatible Software SPI Interface Terminals Proven PCB Layout Fully Assembled and Tested
圖3.評估板MAX5214DACLite外形圖
圖4.評估板MAX5214DACLite電路圖 評估板MAX5214DACLite材料清單:
圖5.評估板MAX5214DACLite元件布局圖(頂層)
圖6.評估板MAX5214DACLite元件布局圖(底層) 詳情請見: 
MAX5214DACLITE.pdf
(1.59 MB)
和
MAX5214-MAX5216.pdf
(2.92 MB)
來源：網絡 |
