Overview
The AD7245ATQ is a 12-bit digital-to-analog converter (DAC) produced by Analog Devices Inc. This component is part of the AD7245A/AD7248A family and is known for its high performance and versatility. The AD7245ATQ features a voltage output DAC with an integrated output amplifier and a Zener voltage reference on a single monolithic CMOS chip. It is designed to be microprocessor-compatible, with high-speed data latches and double-buffered interface logic, making it suitable for a wide range of applications.
Key Specifications
| Parameter | Value | Unit | Conditions |
|---|---|---|---|
| Resolution | 12-bit | ||
| Output Type | Voltage Output | ||
| VDD Range | +12 V to +15 V | V | |
| VSS Range | 0 V or -12 V to -15 V | V | |
| AGND/DGND | 0 V | V | |
| Load Resistance (RL) | 2 kΩ | Ω | |
| Load Capacitance (CL) | 100 pF | pF | |
| Chip Select Pulsewidth (t1) | 55 ns (typ), 80 ns (min) | ns | TMIN to TMAX |
| Write Pulsewidth (t2) | 40 ns (typ), 80 ns (min) | ns | TMIN to TMAX |
| Chip Select to Write Setup Time (t3) | 0 ns (min) | ns | TMIN to TMAX |
| Chip Select to Write Hold Time (t4) | 0 ns (min) | ns | TMIN to TMAX |
| Data Valid to Write Setup Time (t5) | 40 ns (typ) | ns |
Key Features
- Integrated Output Amplifier and Zener Voltage Reference: The AD7245ATQ includes an integrated output amplifier and a Zener voltage reference, eliminating the need for external components to achieve full specified performance.
- High-Speed Data Latches and Double-Buffered Interface Logic: The component is designed with high-speed data latches and double-buffered interface logic, making it compatible with microprocessors and suitable for high-speed applications.
- Extended Temperature Range Operation: The AD7245ATQ operates over an extended temperature range, making it suitable for both commercial and industrial applications.
- No External User Trims Required: No external user trims are necessary to achieve the full specified performance of the DAC.
- Low Digital Feedthrough: The component features a very low digital feedthrough figure of 10 nV-s in a 5 V output range, reducing noise and interference.
- Internal Input Protection: All logic inputs are protected by on-chip distributed diodes, ensuring robust operation.
Applications
- Industrial Control Systems: The AD7245ATQ is suitable for use in industrial control systems due to its extended temperature range and high reliability.
- Medical Devices: Its precision and low noise characteristics make it a good fit for medical devices that require accurate analog outputs.
- Aerospace and Defense: The component's robustness and ability to operate over a wide temperature range make it suitable for aerospace and defense applications.
- Automotive Systems: It can be used in automotive systems that require high precision and reliability in analog output generation.
- Test and Measurement Equipment: The AD7245ATQ is also used in test and measurement equipment where precise analog outputs are necessary.
Q & A
- What is the resolution of the AD7245ATQ DAC?
The AD7245ATQ has a 12-bit resolution.
- What is the output type of the AD7245ATQ?
The AD7245ATQ provides a voltage output.
- What is the typical operating voltage range for the AD7245ATQ?
The typical operating voltage range is +12 V to +15 V for VDD and 0 V or -12 V to -15 V for VSS.
- Does the AD7245ATQ require external user trims for full performance?
No, the AD7245ATQ does not require external user trims to achieve full specified performance.
- What is the significance of the LDAC signal in the AD7245ATQ?
The LDAC signal is an asynchronous input that transfers data from the input latch to the DAC latch and updates the analog output.
- How does the AD7245ATQ protect its logic inputs?
The AD7245ATQ protects its logic inputs with on-chip distributed diodes.
- What is the typical chip select pulsewidth for the AD7245ATQ?
The typical chip select pulsewidth is 55 ns, with a minimum of 80 ns over the operating temperature range.
- What are some common applications of the AD7245ATQ?
The AD7245ATQ is commonly used in industrial control systems, medical devices, aerospace and defense applications, automotive systems, and test and measurement equipment.
- Does the AD7245ATQ support extended temperature range operation?
Yes, the AD7245ATQ supports extended temperature range operation, making it suitable for both commercial and industrial applications.
- What is the digital feedthrough figure of the AD7245ATQ?
The AD7245ATQ has a very low digital feedthrough figure of 10 nV-s in a 5 V output range.
