Overview
The AD7247AAN is a dual 12-bit digital-to-analog converter (DAC) produced by Analog Devices Inc. This component is part of the AD7247A series and is known for its high performance and versatility. The AD7247AAN features a complete dual 12-bit DAC with on-chip voltage reference and output amplifiers, making it suitable for a wide range of applications requiring precise analog output.
This device is an enhanced version of the industry-standard AD7247, offering improvements such as operation from 12 V to 15 V supplies, faster interface times, and better reference stability. It is designed to be microprocessor-compatible with high-speed data latches and interface logic, facilitating easy integration into various systems.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Resolution | 12-bit | |
| Output Range (Single Supply) | 0 V to +5 V, 0 V to +10 V | V |
| Output Range (Dual Supply) | 0 V to +5 V, 0 V to +10 V, ±5 V | V |
| Power Supply Range | 12 V to 15 V | V |
| Power Consumption (Typical) | 165 mW | mW |
| Data Setup Time | 30 ns | ns |
| Voltage Output Settling Time | 8 µs (Typical), 10 µs (Max) | µs |
| DC Output Impedance | 0.5 Ω | Ω |
| Input Current (Data Inputs) | ±10 µA (Max) | µA |
| Input Capacitance | 8 pF (Max) | pF |
Key Features
- Complete Dual 12-Bit DAC: Comprising two 12-bit CMOS DACs on a single chip, offering space savings and increased reliability over multichip designs.
- On-Chip Voltage Reference and Output Amplifiers: Includes a Zener voltage reference and output amplifiers, eliminating the need for external components.
- Microprocessor Compatibility: High-speed data latches and interface logic allow easy interfacing with most modern microprocessors.
- Flexible Power Supply Operation: Can operate from single or dual supplies, with a range of 12 V to 15 V.
- Fast Interface Times: Data setup time of 30 ns, facilitating fast data transfer and processing.
- Low Power Consumption: Typical power consumption of 165 mW in single supply operation.
- REF OUT/REF IN Function: Allows the use of either the on-chip 5 V reference or an external reference voltage.
- Asynchronous LDAC Signal: Enables simultaneous updating of multiple AD7247AAN devices.
Applications
- Industrial Control Systems: Used in control systems that require precise analog output signals.
- Medical Devices: Suitable for medical equipment that demands high accuracy and reliability in analog signal generation.
- Aerospace and Defense: Applied in various aerospace and defense applications where high-performance DACs are essential.
- Automotive Systems: Used in automotive systems for controlling and monitoring various parameters.
- Test and Measurement Equipment: Utilized in test and measurement instruments to generate accurate analog signals.
Q & A
- What is the resolution of the AD7247AAN DAC?
The AD7247AAN has a resolution of 12 bits.
- What are the output voltage ranges for the AD7247AAN in single and dual supply operations?
In single supply operation, the output ranges are 0 V to +5 V and 0 V to +10 V. In dual supply operation, the ranges include 0 V to +5 V, 0 V to +10 V, and ±5 V.
- What is the typical power consumption of the AD7247AAN in single supply operation?
The typical power consumption is 165 mW.
- How does the AD7247AAN interface with microprocessors?
The AD7247AAN is microprocessor-compatible with high-speed data latches and interface logic, allowing easy interfacing with most modern microprocessors.
- What is the settling time for the voltage output of the AD7247AAN?
The settling time is typically 8 µs and a maximum of 10 µs.
- Can the AD7247AAN use an external reference voltage?
Yes, the AD7247AAN has a REF OUT/REF IN function that allows the use of either the on-chip 5 V reference or an external reference voltage.
- How does the asynchronous LDAC signal work in the AD7247AAN?
The asynchronous LDAC signal controls the transfer of 12-bit data from the input latches to the DAC latches and is level triggered, updating both DAC latches and analog outputs simultaneously.
- What are the typical applications of the AD7247AAN?
The AD7247AAN is used in industrial control systems, medical devices, aerospace and defense applications, automotive systems, and test and measurement equipment.
- What is the input current for the data inputs of the AD7247AAN?
The input current for the data inputs is ±10 µA maximum.
- What is the DC output impedance of the AD7247AAN?
The DC output impedance is typically 0.5 Ω.
