Maxim MAX5214 14位数模转换解决方案

2012年07月10日 12:33 发布者：1770309616

Maxim 公司的MAX5214/MAX5216是14位/16位单路低功耗电压输入的数模转换器(DAC),工作电压2.7V-5.25V,MAX5214的相对精度±0.25 LSB INL, MAX5216的相对精度±1.0 LSB INL,具有50MHz, 3线SPI/QSPI/MICROWIRE兼容的接口,主要用于2线传感器,通信系统,过程控制和伺服回路,手提仪表,功率放大器控制,可编电压和电流源.本文介绍了MAX5214/MAX5216主要特性,功能框图,典型应用电路图以及评估板MAX5214DACLite主要特性,电路图和材料清单,PCB元件布局图.

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应用:

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

图1.MAX5214/MAX5216功能框图

图2.MAX5214/MAX5216典型应用电路图

评估板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.

评估板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