Overview
The DAC9881SBRGER is an 18-bit, single-channel, voltage-output digital-to-analog converter (DAC) produced by Texas Instruments. This device is known for its high precision, low noise, and fast settling time, making it suitable for a variety of applications requiring high accuracy and reliability. The DAC9881 features an on-chip precision output amplifier that allows for a rail-to-rail output swing over a supply range of 2.7 V to 5.5 V. It supports a standard SPI interface with clock frequencies up to 50 MHz and operates in either unipolar straight binary or two's complement input mode.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Resolution | 18 bits | |
| Relative Accuracy | ±2 LSB maximum | |
| Noise Voltage Density | 24 nV/√Hz (Gain = 1) | |
| Settling Time | 5 μs | |
| Supply Voltage Range | 2.7 V to 5.5 V | V |
| Output Range | 0 V to AVDD | V |
| Power Consumption (Active) | 4.3 mW (at 5 V) | mW |
| Power Consumption (Power-Down) | 125 µW (at 5 V) | µW |
| Operating Temperature Range | –40°C to +105°C | °C |
| Package Type | VQFN-24, 4 mm × 4 mm |
Key Features
- 18-bit monotonicity over the temperature range
- Low noise: 24 nV/√Hz
- Fast settling time: 5 μs
- On-chip output buffer amplifier with rail-to-rail operation
- Selectable power-on reset to zero-scale or midscale
- Power-down mode reducing current consumption to 25 µA at 5 V
- Fast SPI interface with Schmitt-triggered inputs up to 50 MHz
- Support for unipolar straight binary or two's complement input mode
- DAC loading control
Applications
- Semiconductor test
- Oscilloscope (DSO)
- X-ray systems
- Lab and field instrumentation
- Data acquisition (DAQ)
Q & A
- What is the resolution of the DAC9881?
The DAC9881 has a resolution of 18 bits. - What is the relative accuracy of the DAC9881?
The relative accuracy is ±2 LSB maximum. - What is the noise voltage density of the DAC9881?
The noise voltage density is 24 nV/√Hz in Gain = 1 mode. - How fast does the DAC9881 settle?
The settling time is 5 μs. - What is the supply voltage range for the DAC9881?
The supply voltage range is 2.7 V to 5.5 V. - What are the power consumption modes of the DAC9881?
The DAC9881 has an active power consumption of 4.3 mW at 5 V and a power-down mode consuming 125 µW at 5 V. - What is the operating temperature range of the DAC9881?
The operating temperature range is –40°C to +105°C. - What package type is the DAC9881 available in?
The DAC9881 is available in a VQFN-24 package, 4 mm × 4 mm. - Does the DAC9881 support different input data formats?
Yes, it supports unipolar straight binary and two's complement input modes. - How does the power-down mode work on the DAC9881?
The power-down mode is activated by setting the PDN pin high, reducing the current consumption to 25 µA at 5 V.
