概述
　　The MAX5120/MAX5121 are low-power, 12-bit, voltage-output digital-to-analog converters (DACs) with an internal precision bandgap reference and an output amplifier. The MAX5120 operates on a +5V supply with an internal amplifier reference of +2.5V and is capable of a +4.095V full-scale output range. The MAX5121, operating on +3V, delivers its +2.0475V full-scale output with an internal precision reference of +1.25V. If necessary, the user can override the internal, < 10ppm/°C voltage reference with an external reference. Both devices draw only 500μA of supply current, which reduces to 3μA in power-down mode. In addition, their power-up reset feature allows for a user-selectable initial output state of either 0V or midscale and minimizes output voltage glitches during power-up.
　　The serial interface is compatible with SPI™, QSPI™ and MICROWIRE™, which makes the MAX5120/MAX5121 suitable for cascading multiple devices. Each DAC has a double-buffered input organized as an input register followed by a DAC register. A 16-bit shift register loads data into the input register. The DAC register may be updated independently or simultaneously with the input register.
　　Both devices are available in a 16-pin QSOP package and are specified for the extended industrial (-40°C to +85°C) temperature range. For pin-compatible 14-bit upgrades, see the MAX5170/MAX5172 data sheet; for pin-compatible 13-bit versions, see the MAX5130/MAX5131 data sheet.
　　关键特性
　　Single-Supply Operation
　　+5V (MAX5120)
　　+3V (MAX5121)
　　Full-Scale Output Range
　　+4.095V (MAX5120)
　　+2.0475V (MAX5121)
　　Built-In 10ppm/°C (max) Precision Bandgap Reference
　　+2.5V (MAX5120)
　　+1.25V (MAX5121)
　　Adjustable Output Offset
　　SPI/QSPI/Microwire-Compatible, 3-Wire Serial Interface
　　Pin-Programmable Shutdown Mode and Power-Up Reset (0V or Midscale Output Voltage)
　　Buffered Output Capable of Driving 5kΩ ||100pF or 4-20mA Loads
　　Space-Saving 16-Pin QSOP Package
　　Pin-Compatible 13-Bit Upgrades Available (MAX5130/MAX5131)
　　应用
　　μP控制系统
　　自动测试设备(ATE)
　　数字增益与失调控制
　　工业过程控制
　　运动控制
　　MAX5120、MAX5121功能原理框图

　　关键参数