An application I am working on consists of varying the resistance between two points precisely. The max current flow through the resistive load would me 50mA and minimum current flow would be 10mA. However every digipot I have seen usually can’t handle more than 3mA of through put through the wiper. In an attempt to fix this problem I looked at DAC units and this is what I found.
In the circuit diagram the upper voltage source can be considered the constant 8v supply. The lower dc source can be thought of as a variable DAC. The resistor in the middle provides current regulation.
The idea is that by increasing or decreasing the ADC output voltage the voltage differential across the resistor is controlled and the current flowing from the 8V source can be precicly regulated.
I’m just a dumb EE student however and although on paper and in simulations this looks good I still would like an expert opinion.
HOW DO THEY NOT HAVE HIGHER THROUGHPUT DIGIPOTS BY NOW?!?
In the circuit diagram the upper voltage source can be considered the constant 8v supply. The lower dc source can be thought of as a variable DAC. The resistor in the middle provides current regulation.
The idea is that by increasing or decreasing the ADC output voltage the voltage differential across the resistor is controlled and the current flowing from the 8V source can be precicly regulated.
I’m just a dumb EE student however and although on paper and in simulations this looks good I still would like an expert opinion.
HOW DO THEY NOT HAVE HIGHER THROUGHPUT DIGIPOTS BY NOW?!?