Contents
How is the output voltage swing calculated on a DAC?
Output voltage swing: the output swing is usually from 0V to V REF (the DAC’s reference voltage). Number of bits of resolution: The number of bits of resolution determines how many adjustment steps the DAC will have. The number of steps is equal to 2 N, where “N” is the number of bits of resolution of the DAC.
What is the step size of the max5361 DAC?
For example, the MAX5361, a 6-bit DAC with a 4V output voltage swing, has a step size of 62.5mV (4V output voltage swing/2 6 steps). Full-scale voltage error: For DACs with <= 8-bits of resolution, this error is generally the largest, and will have the greatest effect on overall system accuracy.
How many adjustment steps are in a DAC?
Number of bits of resolution: The number of bits of resolution determines how many adjustment steps the DAC will have. The number of steps is equal to 2 N, where “N” is the number of bits of resolution of the DAC. A 6-bit DAC, for example, will have 2 6, or 64 steps; while an 8-bit DAC will have 2 8, or 256 adjustment steps.
How is the output voltage of a DC converter adjusted?
This article discusses several methods of digitally adjusting the output voltage of a DC-DC converter, with emphasis on devices for portable applications. A DAC is simply a digitally-controlled voltage source. The digital interface to a DAC can be either serial or parallel.
How to control voltage with a DAC microchip?
It might be possible to use a high voltage MOSFET from ADJ to GND with perhaps a 1.2 k resistor from output to ADJ. Put something like a 420k resistor across the source and drain to limit maximum output to 420V. Then you may be able to adjust the gate voltage using PWM or a DAC to get Rds of 1k for 2.2 volts or 100k for 101.2 volts.
Can a DAC be used to generate a constant analog signal?
The DAC can be used to generate a constant analog signal. It uses the output of the Voltage Reference (VREF) peripheral as positive reference. The DAC output ranges from 0V to 255 × VR EF 256 VREFcan be selected from a list of predefined values: Figure 3-1.