Understanding ADC and DAC Power Requirements

Oct 13, 2025 by wbrum.org 63 views

Introduction

When designing a system that incorporates Analog-to-Digital Converters (ADCs) and Digital-to-Analog Converters (DACs), it is essential to determine the power supply requirements for these components. The power supply must be able to provide the necessary voltage and current to the ADC and DAC, as well as any other components in the system. In this article, we will discuss the power supply requirements for the AD7792 ADC and AD5686 DAC, and provide guidance on how to determine the power supply requirements for other ADCs and DACs.

Understanding ADC and DAC Power Requirements

ADCs and DACs require power to operate, and the power requirements can vary depending on the specific device and the application. The AD7792 ADC and AD5686 DAC are both powered by a 5V analog supply, which is used to power the analog circuitry and reference voltages. The digital supply, on the other hand, requires a separate power supply that is typically in the range of 1.8V to 5V.

Power Requirements for the AD7792 ADC

The AD7792 ADC is a 24-bit, delta-sigma ADC that requires a 5V analog supply and a digital supply. The analog supply is used to power the ADC's analog circuitry, including the input buffer, the delta-sigma modulator, and the output buffer. The digital supply is used to power the ADC's digital circuitry, including the digital-to-analog converter (DAC) and the output buffer.

The AD7792 ADC has a typical power consumption of 1.5mW at 5V, and a maximum power consumption of 3.5mW at 5V. The ADC also has a low power mode that can reduce the power consumption to as low as 0.5mW.

Power Requirements for the AD5686 DAC

The AD5686 DAC is a 16-bit, voltage-output DAC that requires a 5V analog supply and a digital supply. The analog supply is used to power the DAC's analog circuitry, including the output buffer and the reference voltage generator. The digital supply is used to power the DAC's digital circuitry, including the digital-to-analog converter (DAC) and the output buffer.

The AD5686 DAC has a typical power consumption of 1.5mW at 5V, and a maximum power consumption of 3.5mW at 5V. The DAC also has a low power mode that can reduce the power consumption to as low as 0.5mW.

Determining Power Supply Requirements

To determine the power supply requirements for the AD7792 ADC and AD5686 DAC, you will need to consider the following factors:

Analog supply voltage: The analog supply voltage must be able to provide the necessary voltage to the ADC and DAC's analog circuitry.
Digital supply voltage: The digital supply voltage must be able to provide the necessary voltage to the ADC and DAC's digital circuitry.
Current requirements: The ADC and DAC will require a certain amount of current to operate, which will depend on the specific device and the application.
Power consumption: The ADC and DAC will consume a certain amount of power, which will depend on the specific device and the application.

Calculating Power Supply Requirements

To calculate the power supply requirements for the AD7792 ADC and AD5686 DAC, you will need to consider the following factors:

Analog supply current: The analog supply current will depend on the specific device and the application. For the AD7792 ADC, the analog supply current is typically around 1mA. For the AD5686 DAC, the analog supply current is typically around 0.5mA.
Digital supply current: The digital supply current will depend on the specific device and the application. For the AD7792 ADC, the digital supply current is typically around 10mA. For the AD5686 DAC, the digital supply current is typically around 5mA.
Power consumption: The power consumption will depend on the specific device and the application. For the AD7792 ADC, the power consumption is typically around 1.5mW. For the AD5686 DAC, the power consumption is typically around 1.5mW.

Example Calculations

To calculate the power supply requirements for the AD7792 ADC and AD5686 DAC, you can use the following example calculations:

Analog supply voltage: 5V
Analog supply current: 1mA (AD7792 ADC), 0.5mA (AD5686 DAC)
Digital supply voltage: 3.3V
Digital supply current: 10mA (AD7792 ADC), 5mA (AD5686 DAC)
Power consumption: 1.5mW (AD7792 ADC), 1.5mW (AD5686 DAC)

Using these values, you can calculate the power supply requirements for the AD7792 ADC and AD5686 DAC as follows:

Analog supply power: 5V x 1mA = 5mW (AD7792 ADC), 5V x 0.5mA = 2.5mW (AD5686 DAC)
Digital supply power: 3.3V x 10mA = 33mW (AD7792 ADC), 3.3V x 5mA = 16.5mW (AD5686 DAC)
Total power: 5mW + 33mW = 38.5mW (AD7792 ADC), 2.5mW + 16.5mW = 19mW (AD5686 DAC)

Conclusion

In conclusion, determining the power supply requirements for ADCs and DACs is a critical step in designing a system that incorporates these components. By understanding the power requirements for the AD7792 ADC and AD5686 DAC, you can ensure that your system has the necessary power supply to operate correctly. By following the guidelines outlined in this article, you can calculate the power supply requirements for your system and ensure that it meets the necessary power requirements.

Recommendations

Based on the calculations outlined in this article, we recommend the following:

Analog supply voltage: 5V
Digital supply voltage: 3.3V
Analog supply current: 1mA (AD7792 ADC), 0.5mA (AD5686 DAC)
Digital supply current: 10mA (AD7792 ADC), 5mA (AD5686 DAC)
Power consumption: 1.5mW (AD7792 ADC), 1.5mW (AD5686 DAC)

By following these recommendations, you can ensure that your system has the necessary power supply to operate correctly and meet the necessary power requirements.

Additional Resources

For more information on determining power supply requirements for ADCs and DACs, please refer to the following resources:

AD7792 ADC datasheet: AD7792 Datasheet
AD5686 DAC datasheet: AD5686 Datasheet
Power supply design guidelines: Power Supply Design Guidelines

Q: What is the typical power consumption of the AD7792 ADC?

A: The typical power consumption of the AD7792 ADC is 1.5mW at 5V.

Q: What is the maximum power consumption of the AD7792 ADC?

A: The maximum power consumption of the AD7792 ADC is 3.5mW at 5V.

Q: What is the typical power consumption of the AD5686 DAC?

A: The typical power consumption of the AD5686 DAC is 1.5mW at 5V.

Q: What is the maximum power consumption of the AD5686 DAC?

A: The maximum power consumption of the AD5686 DAC is 3.5mW at 5V.

Q: How do I determine the power supply requirements for my ADC/DAC system?

A: To determine the power supply requirements for your ADC/DAC system, you will need to consider the following factors:

Analog supply voltage: The analog supply voltage must be able to provide the necessary voltage to the ADC and DAC's analog circuitry.
Digital supply voltage: The digital supply voltage must be able to provide the necessary voltage to the ADC and DAC's digital circuitry.
Current requirements: The ADC and DAC will require a certain amount of current to operate, which will depend on the specific device and the application.
Power consumption: The ADC and DAC will consume a certain amount of power, which will depend on the specific device and the application.

Q: How do I calculate the power supply requirements for my ADC/DAC system?

A: To calculate the power supply requirements for your ADC/DAC system, you will need to consider the following factors:

Analog supply current: The analog supply current will depend on the specific device and the application. For the AD7792 ADC, the analog supply current is typically around 1mA. For the AD5686 DAC, the analog supply current is typically around 0.5mA.
Digital supply current: The digital supply current will depend on the specific device and the application. For the AD7792 ADC, the digital supply current is typically around 10mA. For the AD5686 DAC, the digital supply current is typically around 5mA.
Power consumption: The power consumption will depend on the specific device and the application. For the AD7792 ADC, the power consumption is typically around 1.5mW. For the AD5686 DAC, the power consumption is typically around 1.5mW.

Q: What are the recommended power supply requirements for the AD7792 ADC and AD5686 DAC?

A: Based on the calculations outlined in this article, we recommend the following:

Analog supply voltage: 5V
Digital supply voltage: 3.3V
Analog supply current: 1mA (AD7792 ADC), 0.5mA (AD5686 DAC)
Digital supply current: 10mA (AD7792 ADC), 5mA (AD5686 DAC)
Power consumption: 1.5mW (AD7792 ADC), 1.5mW (AD5686 DAC)

Q: Where can I find more information on determining power supply requirements for ADC/DAC systems?

A: For more information on determining power supply requirements for ADC/DAC systems, please refer to the following resources:

AD7792 ADC datasheet: AD7792 Datasheet
AD5686 DAC datasheet: AD5686 Datasheet
Power supply design guidelines: Power Supply Design Guidelines

Q: What are the benefits of using a power supply with a high efficiency rating?

A: Using a power supply with a high efficiency rating can help to reduce heat generation, improve system reliability, and increase overall system performance.

Q: What are the benefits of using a power supply with a low noise rating?

A: Using a power supply with a low noise rating can help to reduce electromagnetic interference (EMI), improve system reliability, and increase overall system performance.

Q: How do I select the right power supply for my ADC/DAC system?

A: To select the right power supply for your ADC/DAC system, you will need to consider the following factors:

Power supply voltage: The power supply voltage must be able to provide the necessary voltage to the ADC and DAC's analog and digital circuitry.
Power supply current: The power supply current must be able to provide the necessary current to the ADC and DAC's analog and digital circuitry.
Power supply efficiency: The power supply efficiency must be high enough to reduce heat generation and improve system reliability.
Power supply noise: The power supply noise must be low enough to reduce electromagnetic interference (EMI) and improve system reliability.

By considering these factors and using the guidelines outlined in this article, you can select the right power supply for your ADC/DAC system and ensure that it meets the necessary power requirements.