Power Electronics

Nonvolatile Digital-to-Analog Converter Products

Xicor Inc.’s new X79000 series of digital-to-analog converters (DACs) is targeted at the bias adjustment and calibration market. This family of products integrates a single channel, 12-bit nonvolatile DAC, voltage reference with selectable gain and level shift, a configurable output buffer and general purpose EEPROM into a single-chip solution. The flexibility of the X79000 series can achieve effective resolution of 14 bits to 16 bits by utilizing its programmability and non-volatile storage at a 12-bit DAC cost.

The X79000 series offer several advantages for bias and calibration applications, such as data acquisition, sensor signal conditioning and power amplification bias. These devices provide several non-volatile registers whose values are restored during the power up of the device, making the device capable of operating independently of a microcontroller. The flexible DAC, or FlexDAC™, devices provide user configurability of the following functions:

  • Nonvolatile initial-value, DAC-register that restores the values during the power up.
  • Push-Pot-style DAC control that allows for incrementing or decrementing from the initial DAC value in either one LSB or byte or word steps, making the device ideal for calibration or human interface.
  • Nonvolatile selection of both the upper and lower DAC ladder voltages using a single internal voltage reference. A serial interface allows for on-the-fly selection of these values without any hardware changes using an internal variable gain and level shift circuits. This provides digital selection for course or fine voltage output span.
  • Unbuffered output or buffered output (configurable via external feedback) options.
  • 64-bytes of general purpose EEPROM to store manufacturing information, calibration coefficients and other important information, such as curve-fit profiling, signal conditioning parameters and device or system identification.

For more information, visit www.xicor.com.

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