Overview
The AD667SD is a microprocessor-compatible 12-bit digital-to-analog converter (DAC) produced by Analog Devices Inc. This component integrates a high stability buried Zener voltage reference and a double-buffered input latch on a single chip, ensuring high accuracy and fast settling times. The AD667SD is designed for use in a wide range of applications requiring precise analog output from digital inputs, particularly in environments with varying temperatures.
Key Specifications
| Parameter | Specification |
|---|---|
| Resolution | 12 bits |
| Output Type | Voltage |
| Temperature Range | -55°C to +125°C |
| Linearity Error | ±1/2 LSB maximum at +25°C, ±1/2 LSB over full temperature range |
| Full-Scale Gain Temperature Coefficient | 5 ppm/°C typical |
| Package Options | Ceramic DIP (D-28), Leadless Ceramic Chip Carrier (E-28A) |
| Input Coding | Positive-true binary, unipolar and bipolar coding supported |
| Settling Time | Fast settling time due to high-speed bipolar current steering switches and laser-trimmed resistor network |
| Power Supply | Minimum dual supply voltage: 11.4V |
Key Features
- High Accuracy and Linearity: The AD667SD features ±1/2 LSB maximum linearity error over the full operating temperature range, ensuring high accuracy in analog output.
- Double-Buffered Input Latch: Allows direct interface to 4-, 8-, 12-, or 16-bit microprocessor buses, preventing spurious analog output values.
- High Stability Voltage Reference: The buried Zener diode provides a low noise voltage reference with long-term stability and minimal temperature drift.
- Fast Settling Time: Achieved through the use of high-speed bipolar current steering switches and a laser-trimmed thin-film resistor network.
- Microprocessor Compatibility: Designed to work seamlessly with various microprocessors, with control inputs consistent with general microprocessor practices.
Applications
- Industrial Control Systems: Where precise analog outputs are required for control and monitoring.
- Aerospace and Defense: The AD667SD's military-grade versions (e.g., AD667SD/883B) make it suitable for high-reliability applications in these sectors.
- Medical Devices: For applications requiring accurate and stable analog signals, such as in medical imaging and diagnostic equipment.
- Automotive Systems: In systems that need reliable and accurate analog outputs over a wide temperature range.
Q & A
- What is the resolution of the AD667SD DAC?
The AD667SD has a 12-bit resolution.
- What is the temperature range for the AD667SD?
The AD667SD operates over a temperature range of -55°C to +125°C.
- What type of input coding does the AD667SD support?
The AD667SD supports positive-true binary, unipolar, and bipolar coding.
- How does the double-buffered input latch work?
The double-buffered input latch allows data to be loaded into the first rank of latches and then transferred to the second rank, preventing spurious analog output values.
- What is the significance of the buried Zener diode in the AD667SD?
The buried Zener diode provides a high stability, low noise voltage reference with minimal temperature drift.
- What are the package options for the AD667SD?
The AD667SD is available in ceramic DIP (D-28) and leadless ceramic chip carrier (E-28A) packages.
- How fast is the settling time of the AD667SD?
The AD667SD has a fast settling time due to its high-speed bipolar current steering switches and laser-trimmed resistor network.
- What is the minimum dual supply voltage required for the AD667SD?
The minimum dual supply voltage required is 11.4V.
- Is the AD667SD suitable for military applications?
Yes, the AD667SD has military-grade versions (e.g., AD667SD/883B) that are screened in accordance with MIL-STD-883.
- What are some common applications of the AD667SD?
The AD667SD is used in industrial control systems, aerospace and defense, medical devices, and automotive systems.
