Overview
The AD5781ARUZ from Analog Devices Inc. is a single 18-bit, unbuffered voltage-output digital-to-analog converter (DAC). It operates from a bipolar supply of up to 33 V, making it versatile for various high-precision applications. The DAC accepts a positive reference input range of 5 V to VDD - 2.5 V and a negative reference input range of VSS + 2.5 V to 0 V. It is known for its high accuracy and stability, with a relative accuracy specification of ±0.5 LSB maximum and guaranteed monotonic operation with a ±0.5 LSB differential nonlinearity (DNL) maximum specification.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions/Comments |
|---|---|---|---|---|---|
| Resolution | 18 bits | ||||
| Integral Nonlinearity (INL) | ±0.5 LSB | ||||
| Differential Nonlinearity (DNL) | ±0.5 LSB | ||||
| Noise Spectral Density | 7.5 nV/√Hz | At 100 kHz | |||
| Settling Time | 1 µs | ||||
| Temperature Drift | <0.05 ppm/°C | ||||
| Operating Temperature Range | -40°C | +125°C | |||
| Power Supply Range | ±16.5 V | ||||
| Digital Interface Clock Rate | Up to 35 MHz | Compatible with SPI, QSPI, MICROWIRE, and DSP interfaces | |||
Key Features
- High Accuracy: ±0.5 LSB INL and ±0.5 LSB DNL ensure high precision in output voltage.
- Low Noise: 7.5 nV/√Hz noise spectral density at 100 kHz.
- Stability: Long-term linearity stability of 0.05 LSB and temperature drift of <0.05 ppm/°C.
- Fast Settling Time: 1 µs settling time for rapid response.
- Wide Power Supply Range: Operates from bipolar supplies up to ±16.5 V.
- Flexible Digital Interface: 3-wire serial interface compatible with SPI, QSPI, MICROWIRE, and DSP standards, operating up to 35 MHz.
- Power-On Reset and Clear Logic: Ensures the DAC output powers up to 0 V and in a known output impedance state.
- Output Clamp Feature: Places the output in a defined load state.
Applications
- Medical Instrumentation: High precision and stability make it suitable for medical devices.
- Test and Measurement: Ideal for precise voltage output in test and measurement equipment.
- Industrial Control: Used in industrial control systems requiring high accuracy and reliability.
- Scientific and Aerospace Instrumentation: Supports applications in scientific research and aerospace due to its high precision and stability.
- Data Acquisition Systems: Suitable for data acquisition systems needing precise analog output.
- Digital Gain and Offset Adjustment: Can be used for adjusting gain and offset in various applications.
- Power Supply Control: Used in power supply control systems for precise voltage regulation.
Q & A
- What is the resolution of the AD5781ARUZ DAC?
The AD5781ARUZ is an 18-bit DAC.
- What is the maximum integral nonlinearity (INL) of the AD5781ARUZ?
The maximum INL is ±0.5 LSB.
- What is the noise spectral density of the AD5781ARUZ at 100 kHz?
The noise spectral density is 7.5 nV/√Hz at 100 kHz.
- What is the settling time of the AD5781ARUZ?
The settling time is 1 µs.
- What is the operating temperature range of the AD5781ARUZ?
The operating temperature range is -40°C to +125°C.
- What is the power supply range for the AD5781ARUZ?
The power supply range is up to ±16.5 V.
- What digital interfaces is the AD5781ARUZ compatible with?
The AD5781ARUZ is compatible with SPI, QSPI, MICROWIRE, and DSP interfaces.
- Does the AD5781ARUZ have a power-on reset feature?
Yes, the AD5781ARUZ has a power-on reset circuit that ensures the DAC output powers up to 0 V and in a known output impedance state.
- What are some common applications of the AD5781ARUZ?
Common applications include medical instrumentation, test and measurement, industrial control, scientific and aerospace instrumentation, data acquisition systems, digital gain and offset adjustment, and power supply control.
- Is the AD5781ARUZ suitable for defense and aerospace applications?
Yes, the AD5781-EP version supports defense and aerospace applications and complies with the AQEC standard.
