The 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 twos 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 V. Power consumption is 4 mW at 5 V, reducing to 125 µW in power-down mode.
The DAC9881 is available in a 4 mm × 4 mm VQFN-24 package with a specified temperature
range of –40°C to 105°C.
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