14-/16-Bit, Low-Power, Buffered Output, Rail-to-Rail DACs with SPI Interface

Description

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The MAX5214/MAX5216 are pin-compatible, 14-bit and 16-bit digital-to-analog converters (DACs). The MAX5214/MAX5216 are single-channel, low-power, buffered 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 5.5V supply voltage range. Power consumption is extremely low to accommodate most low-power and low-voltage applications. These devices feature a 3-wire SPI-/QSPI^™-/MICROWIRE-/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 powered down after completion of each serial input frame. On power-up, the MAX5214/MAX5216 reset the DAC output to zero, providing additional safety for applications 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 80µA (max) and a low offset error of ±0.25mV. A zero level applied to the active-low 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 5mm), 8-pin µMAX^® package and are specified over the -40°C to +105°C extended industrial temperature range.

Key Features

• Low-Power Consumption (80µA max)
• 14-/16-Bit Resolution in a 3mm x 5mm, 8-Pin µMAX Package
• Relative Accuracy
  • ±0.40 LSB INL (MAX5214, 14-Bit typ, ±1 LSB max)
  • ±1.2 LSB INL (MAX5216, 16-Bit typ, ±4 LSB max)
• Guaranteed Monotonic Over All Operating Ranges
• Low Gain and Offset Error
• Wide 2.7V to 5.5V 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 Active-Low CLR Clears DAC Output to Code 0
• High Reference Input Resistance for Power Reduction
• Buffered Voltage Output Directly Drives 10kΩ Loads

Applications/Uses

• 2-Wire Sensors
• Automatic Test Equipment
• Automatic Tuning
• Communication Systems
• Gain and Offset Adjustment
• Portable Instrumentation
• Power Amplifier Control
• Process Control and Servo Loops
• Programmable Voltage and Current Sources