High Precision, Digital-to-Analog Conversion Using the 16-Bit AD5541/AD5542 Voltage Output DAC, ADR421 Reference, and the AD8628 Auto-Zero Op Amp
Precision 16-bit voltage output DAC circuit using the AD5542, ADR421 voltage reference, and AD8628 auto-zero op amp for high accuracy and low noise performance.
Overview
This application note describes a high-precision, low-power digital-to-analog conversion circuit. It utilizes the AD5542 16-bit voltage output DAC in combination with an ADR421 voltage reference and an AD8628 auto-zero operational amplifier serving as a reference buffer. The design addresses linearity errors caused by the code-dependent input impedance of the DAC by using a zero-drift buffer. The circuit operates on a single 5V supply and achieves ±1 LSB integral nonlinearity (INL) and differential nonlinearity (DNL) errors. The document also provides guidance on component selection for output buffers and alternative references, as well as PCB layout recommendations for maintaining signal integrity in precision data conversion applications.
Use Cases
- Instrumentation
- Process Control
- Precision Voltage Output
- Data Acquisition Systems
- Medical Equipment
Topics
Referenced Parts
Analog Devices
The circuit shown in Figure 1 provides precision data conversion using the AD5542 voltage output digital-to-analog converter (DAC)
Analog Devices
the AD8628 reference buffer provide benefits previously found only in expensive, auto-zeroing or chopper stabilized amplifiers.
Analog Devices
the ADR421 voltage reference and the AD8628 auto-zero operational amplifier (op amp) as the reference buffer.
Analog Devices
The AD8538 is another excellent auto-zero op amp candidate to be used for buffering the reference in this circuit.
Analog Devices
The 2.500 V (typical) output ADR421 can be replaced by either the ADR423 or the ADR425
Analog Devices
the ADR421 can be replaced by either the ADR423 or the ADR425, which are low noise references available from the same reference family
Analog Devices
The ADR441 and the ADR431 ultralow noise references are suitable substitutes that provide 2.5 V (typical).
| AD5541 | Analog Devices | High Precision, Digital-to-Analog Conversion Using the 16-Bit AD5541/AD5542 |
| AD5542 | Analog Devices | The circuit shown in Figure 1 provides precision data conversion using the AD5542 voltage output digital-to-analog converter (DAC) |
| AD8628 | Analog Devices | the AD8628 reference buffer provide benefits previously found only in expensive, auto-zeroing or chopper stabilized amplifiers. |
| ADR421 | Analog Devices | the ADR421 voltage reference and the AD8628 auto-zero operational amplifier (op amp) as the reference buffer. |
| AD8538 | Analog Devices | The AD8538 is another excellent auto-zero op amp candidate to be used for buffering the reference in this circuit. |
| AD8605 | Analog Devices | The AD8605 or the AD8655 are also suitable output buffer options. |
| AD8655 | Analog Devices | The AD8605 or the AD8655 are also suitable output buffer options. |
| ADR423 | Analog Devices | The 2.500 V (typical) output ADR421 can be replaced by either the ADR423 or the ADR425 |
| ADR425 | Analog Devices | the ADR421 can be replaced by either the ADR423 or the ADR425, which are low noise references available from the same reference family |
| ADR431 | Analog Devices | The ADR441 and the ADR431 ultralow noise references are suitable substitutes |
| ADR441 | Analog Devices | The ADR441 and the ADR431 ultralow noise references are suitable substitutes that provide 2.5 V (typical). |