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OK, great.In fact i understood the concept thoroughly.I have used a similar concept earlier with 2 channels of an Adc to get 2 ranges of a signal.
Is 300uA max error at 50mA acceptable?
I already told you why the TLC4502 won't work in your output amplifier circuit.Oh i just checked and accuracy for test current should be 0.5%.That makes it 250µA
Also,can you put some thoughts on post #28 ?
Awaiting precious reply
Thanks and regards
Hello
I am in the thought process for a new project where one of the modules is to design a Digitally controlled constant current source (50mA-1A in steps of 10mA).
I am thinking about using the Silab's C8051F021 with a 100ksps sampling rate 12-bit-ADC and 12-bit-DAC.
I am looking for some starters/pointers on designing the CC Digital control.
Please help as usual.
Thanks and regards
AS8710 does not show up on Austria Microsystems web site.What exactly you wanted to control (load) ? If you wanted to adjust current digitally, take a look at this constant current driver from Austria Microsystem : AS8710
Which has 8 dedicated individual channel...you can control this device through SPI port...integrate it with a PIC mid range controller....
AS8710 does not show up on Austria Microsystems web site.
Can you get any Linear Tech parts?
May be under some modification.... I have used this chip an year back....
Or try Allegro constant current driver...
Yes I can get some LT10xx parts.(or let me know of some part and i can check)
I also looked up OP777,727,747 checking whether i can get them.
AD620 is the one i can get easily and seems AD is well stocked up.
I can use a dual supply if OP07 has to be used.
Its just that, the specific part LT1677 i am not able to get
@Rajneesh
I looked up Austria Microsystems and found THIS page for LED drivers.Can you point out which ones the closest?
Thanks for the support![]()
Hi Abi...
AS1109 can support 100mA per channel in constant current mode... Im clue less what is exactly you are going to drive with this....
Also for instrument amplifier application.....
If you are going to drive drive more than the max channel current, this will sink....
That should work for your current sink op amp. Intersil doesn't appear to have a spice model for it.Hello Ron
I have another opamp from intersil available immediately
ICL7650S (chopper stabilised)
Please advise
You should be able to do the calculations.
What could be these parts?You can also buy differential amplifiers with the resistors internal to the package, but given your difficulty in getting parts, I don't know if that is an option.
If you make a current source instead of a current sink, the load resistor can connect to ground, which makes your output buffer a simple voltage follower (or nothing, if your A/D input resistance is reasonably high). However, the current source (in my implementation) would require two op amps with rail-to-rail input capability, and power p-channel MOSFET.
If you make a current source instead of a current sink, the load resistor can connect to ground, which makes your output buffer a simple voltage follower (or nothing, if your A/D input resistance is reasonably high). However, the current source (in my implementation) would require two op amps with rail-to-rail input capability, and power p-channel MOSFET.