This datasheet introduces the DAC9881 device from TI. It is a 18-bit single-channel low-noise voltage-output digital-to-analog converter. The device features 18-bit monotonicity, excellent linearity, very low noise and fast settling time. The device's on-chip precision output amplifier allows rail-to-rail output swing to be achieved over the full supply range of 2.7V to 5.5V. The device supports a standard SPI serial interface capable of operating with input data clock frequencies up to 50MHz. 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 in the power-down mode the output can be turned off.
The DAC9881 is an 18‑bit, single‑channel, voltage‑output digital‑to‑analog converter offering low noise, fast settling, and a rail‑to‑rail output buffer. It operates from a single supply of +2.7 V to +5.5 V and supports both straight‑binary and two's‑complement input formats via a fast SPI interface up to 50 MHz.
The document includes ordering information, absolute maximum ratings, detailed electrical characteristics, pin‑out descriptions, timing diagrams, and land‑pattern guidelines for the QFN‑24 package. It also contains important warranty and usage notices from Texas Instruments.
| Resolution | 18‑bit |
|---|---|
| Supply Voltage | +2.7 V to +5.5 V |
| Settling Time | 5 µs |
| Low‑Noise | 24 nV/√Hz |
| Output Current | 25 mA |
| Power Consumption (active) | 4 mW at 5 V |
| Power‑Down Current | 125 µW |
The DAC9881 operates from a single supply of +2.7 V to +5.5 V.
The device can source up to 25 mA at its output.
The DAC settles within 5 µs.
It achieves a noise density of 24 nV/√Hz.