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Hi Everyone,
I am using a pga in my circuits. Most of the time I operate it at unity gain where it's input is a InsAmp referenced to AGND and the output is sent to an A to D. However, I need to get an analog signal from a ground referenced RF crystal detector in one situation. I mux PGA between the InsAmp and the crystal detector. Unfortunately, I need some gain when measuing the crystal detector, but to really get much gain without driving the PGA to the rail I need a VSS reference when measuring the crystal detector. The rest of the time I want the PGA referenced to AGND. No driver is provided to switch the PGA amplifier reference dynamically, but it can be set to VSS in the GUI. I am assuming it can be done dynamically. Is that true? Could someone give me a nickel tour on how to do this for a pga placed at ACB01.
Thanks,
Tim
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PSoC 1
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Look at this register in TRM -
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The lower two bits in the register PGA_GAIN_CR0 are responsible for selecting the reference. You may set the value programmatically.
Bob
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CR0 sets the ref point for the feedback R, not the ref input -
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Thanks Bob and Dana.
I have a dog and pony tomorrow, and I wanted to be able to claim more resolution than I could get with a straight unity PGA feeding the A to D. This will allow me to increase my resolution by 2 or 3.
Tim
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Glad to assist.
Regards, Dana.
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"I have a dog and pony tomorrow"
That seems to be an idiom I've never heard before, what does that mean???
Bob
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A presentation.
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Thanks,Dana!
Bob
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Glad to assist.
Regards, Dana.