+3V/+5V、12位、串行、电压输出DAC，内置电压基准

 

器件号	Replacement	Explanation

说明

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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.

MAX5120、MAX5121：功能原理框图 放大+

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)
• Pin-Compatible 14-Bit Upgrades Available (MAX5170/MAX5172)

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