Overview
The AD670SD, produced by Analog Devices Inc., is a complete 8-bit signal conditioning analog-to-digital converter (ADC). This device integrates an instrumentation amplifier front end, a DAC, a comparator, a successive approximation register (SAR), a precision voltage reference, and a three-state output buffer on a single monolithic chip. It is designed to interface directly with analog systems to an 8-bit data bus without requiring external components or user trims. The AD670SD operates on a +5 V system supply and is configured for both unipolar and bipolar inputs over two input ranges: 0 mV to 255 mV (1 mV/LSB) and 0 to 2.55 V (10 mV/LSB).
Key Specifications
| Parameter | Value |
|---|---|
| Resolution | 8 bits |
| Input Ranges | 0 mV to 255 mV, 0 to 2.55 V |
| Input Type | Differential, unipolar and bipolar |
| Supply Voltage | +5 V |
| Conversion Time | 10 µs |
| Temperature Range | -55°C to +125°C (S grade) |
| Package Types | 20-pin ceramic DIP, 20-terminal LCC (for S grade with MIL-STD-883 processing) |
| Accuracy | ±1 LSB (after laser wafer trimming) |
Key Features
- Integrated instrumentation amplifier front end with excellent common-mode rejection.
- No external components or user trims required for full accuracy.
- Advanced circuit design using I2L (integrated injection logic) and thin-film SiCr resistors for stability.
- Laser wafer trimming for calibration to within ±1 LSB.
- Three-state output buffer for direct interface to 8-bit data bus.
- Available in various grades and package types, including military-grade options.
Applications
The AD670SD is particularly useful in applications requiring the conversion of transducer signals that are superimposed on common-mode voltages. It is suitable for a variety of industrial and military applications where high accuracy and reliability are crucial. Some specific use cases include:
- Transducer signal conversion in industrial automation.
- High-reliability data acquisition systems.
- Military and aerospace applications requiring adherence to MIL-STD-883 standards.
Q & A
- What is the resolution of the AD670SD ADC?
The AD670SD has an 8-bit resolution.
- What are the input ranges of the AD670SD?
The input ranges are 0 mV to 255 mV and 0 to 2.55 V.
- What type of inputs does the AD670SD support?
The AD670SD supports differential inputs and can be configured for both unipolar and bipolar inputs.
- What is the supply voltage for the AD670SD?
The supply voltage is +5 V.
- How long does the conversion process take for the AD670SD?
The conversion time is 10 µs.
- What is the temperature range for the S grade of the AD670SD?
The temperature range for the S grade is -55°C to +125°C.
- What types of packages are available for the AD670SD?
The AD670SD is available in 20-pin ceramic DIP and 20-terminal LCC packages.
- Does the AD670SD require external components or user trims?
No, the AD670SD does not require external components or user trims for full accuracy.
- What is the accuracy of the AD670SD after calibration?
The accuracy is within ±1 LSB after laser wafer trimming.
- Is the AD670SD suitable for military applications?
