DAC9881 18-Bit, Single-Channel, Digital-to-Analog

By Texas Instruments 272

DAC9881 18-Bit, Single-Channel, Digital-to-Analog

Texas Instruments' DAC9881 is an 18-bit, single-channel, voltage-output digital-to-analog converter (DAC). It features 18-bit monotonicity, excellent linearity, very low-noise, and fast settling time. The on-chip precision output amplifier allows rail-to-rail output swing to be achieved over the full supply range of 2.7 V to 5.5 V.

The device supports a standard SPI serial interface capable of operating with input data clock frequencies up to 50 MHz. The DAC9881 requires an external reference voltage to set the output range of the DAC channel. A programmable power-on reset circuit is also incorporated into the device to ensure that the DAC output powers up at zero-scale or midscale, and remains there until a valid write command.

Additionally, the DAC9881 has the capability to function in either unipolar straight binary or two's complement mode. The DAC9881 provides low-power operation. To further save energy, power-down mode can be achieved by accessing the PDN pin, thereby reducing the current consumption to 25 µA at 5 A. Power consumption is 4 mW at 5 V, reducing to 125 µW in power-down mode.

The DAC9881 is available in a 4 mm x 4 mm QFN-24 package with a specified temperature range of -40°C to +105°C.

Block Diagram

Pin Assignments

  • 18-bit monotonic over temperature range
  • Relative accuracy: ±2 LSB max.
  • Low-noise: 24 nV/√Hz
  • Fast settling: 5 µs
  • On-chip output buffer amplifier with rail-to-rail operation
  • Single power supply: +2.7 V to +5.5 V
  • DAC loading control
  • Selectable power-on reset to zero-scale or midscale
  • Power-down mode
  • Unipolar straight binary or twos complement input mode
  • Fast SPI™ interface with Schmitt-Triggered inputs: up to 50 MHz, 1.8 V / 3 V / 5 V logic
  • Small package: QFN-24, 4 mm x 4 mm
  • Automatic test equipment
  • Precision instrumentation
  • Industrial control
  • Data acquisition systems