Overview
The AD7245A, specifically the AD7245AAPZ, is a 12-bit, voltage output, digital-to-analog converter (DAC) produced by Analog Devices Inc. This component is part of the AD7245A/AD7248A series, which offers enhanced performance over earlier models. It features a monolithic CMOS chip with an integrated output amplifier and a 5 V buried Zener diode for a low noise, temperature-compensated reference. The AD7245A is designed for high-speed data transfer and is microprocessor compatible, making it suitable for a variety of applications requiring precise analog output.
Key Specifications
| Parameter | Value | Unit | Conditions |
|---|---|---|---|
| Resolution | 12 bits | ||
| Supply Voltage | +12 V to +15 V | V | VSS = 0 V or -12 V to -15 V |
| Output Voltage Ranges | 0 V to +5 V, 0 V to +10 V, ±5 V | V | Single or dual supplies |
| Linearity Grade | ±1/2 LSB | ||
| Load Capability | +10 V across a 2 kΩ load to GND | V/Ω | |
| Interface Times | t1 (Chip Select Pulsewidth): 80 ns min t2 (Write Pulsewidth): 80 ns min t5 (Data Valid to Write Setup Time): 40 ns typ | ns | TMIN to TMAX |
| Temperature Range | Commercial and industrial grades | ||
| Package Types | 24-pin DIP, SOIC, 28-terminal surface mount |
Key Features
- High-speed data latches and double-buffered interface logic for efficient data transfer.
- Integrated 5 V buried Zener diode for a low noise, temperature-compensated reference.
- No external user trims required to achieve full specified performance.
- Microprocessor compatible with asynchronous LDAC signal for updating the analog output.
- CLR signal for power-on reset and other features.
- Extended temperature range operation for commercial and industrial grades.
- Low digital feedthrough of 10 nV-s in a 5 V output range.
Applications
The AD7245A is suitable for various applications requiring precise analog output, such as:
- Industrial control systems.
- Medical devices.
- Aerospace and defense systems.
- Automotive systems.
- Test and measurement equipment.
Q & A
- What is the resolution of the AD7245A?
The AD7245A has a resolution of 12 bits. - What are the available output voltage ranges for the AD7245A?
The output voltage ranges include 0 V to +5 V, 0 V to +10 V, and ±5 V, depending on the supply configuration. - What is the linearity grade of the AD7245A?
The linearity grade is ±1/2 LSB. - Does the AD7245A require external user trims?
No, the AD7245A does not require external user trims to achieve full specified performance. - What is the purpose of the CLR signal in the AD7245A?
The CLR signal allows features such as power-on reset to be implemented. - What are the package options for the AD7245A?
The AD7245A is available in 24-pin DIP, SOIC, and 28-terminal surface mount packages. - Is the AD7245A microprocessor compatible?
Yes, the AD7245A is microprocessor compatible with high-speed data latches and double-buffered interface logic. - What is the temperature range for the AD7245A?
The AD7245A operates over commercial and industrial temperature ranges. - What is the digital feedthrough of the AD7245A?
The digital feedthrough is 10 nV-s in a 5 V output range. - How does the AD7245A handle data transfer?
The AD7245A uses an asynchronous LDAC signal to transfer data from the input latch to the DAC latch and update the analog output.
