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/etc... Amplifiers & Other Linear Forum
converting negative voltage to positive voltage using LMP 348
I am using DAC0800 which is giving a negative voltage. I tried to convert it to positive by using inverting amplifier but the voltage is getting decrease like if am getting 0v for min. input of DAC and -5V for max. input of DAC after converting 1.9V for min. DAC input and 5V for max. DAC input. Is it possible to get a 0V for min. input of DAC after converting?
This is our first project.Please do help.
Can you tell us more about what speed of conversion you need, and what is the ultimate output voltage range you are looking for? It may be possible to get the DAC0800 output converted to the range you are looking for, but there may also be other TI DAC products that are more suited to your application.
Also, if you could send the schematic of what you currently have prototyped and what type of IC packages you can work with it would help us recommend a circuit to achieve what you are looking for.
Hi Sir ,
Thanks for your replay. I am attaching the schematic diagram of our DAC4341.DAC.doc circuit .The output voltage range what we are looking for is 5V for max. DAC input and 0v for min. It would be helpful for our project if conversion speed is within 100u sec.
Here are some recommended changes to your current circuit to achieve 0V to 5V Vo range. These first few items can be found by careful reading of the LM348-N and DAC0800 datasheets:
Information on general op-amp usage can be found in numerous applications notes, including this one: (http://www.ti.com/lit/an/snla140a/snla140a.pdf)
You may also want to consider a DAC like the TLC7225. It is a voltage output DAC with parallel inputs. It may more directly meet the needs you have.
I hope this is helpful.
Thanks for your answer.It was very helpful for our project.
Best regards ,
Mohammed Bilal Tamkin
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