Does someone has a suggestion to realise an DAC with 7Volt maximum output and 30mA?
With kind regards
Jan Lichtenbelt
DAC 7V output
- Jan Lichtenbelt
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Re: DAC 7V output
Hi Jan,
Sounds like a job for an op amp. You should be able to make a basic amplifier and use resistor values to give you say 1.5 x gain so 0-5V becomes 0-7.5V. Of course the op amp will need access to the higher voltage for it's positive rail.
Vout = Vin * (1 + (R2 / R1))
R1 = 2K
R2 = 1K
7.5V = 5V * 1.5
https://en.wikipedia.org/wiki/Operation ... _amplifier
It's a good idea to use an Op Amp With a DAC anyway as often the DAC output has extremely low driving current and so an op amp even in unity gain mode (1:1 Input Voltage to Output Voltage) will provide a level of buffering and current amplification.
Beware not all op amps are made the same, some can handle rail to rail outputs and some cannot.
Sounds like a job for an op amp. You should be able to make a basic amplifier and use resistor values to give you say 1.5 x gain so 0-5V becomes 0-7.5V. Of course the op amp will need access to the higher voltage for it's positive rail.
Vout = Vin * (1 + (R2 / R1))
R1 = 2K
R2 = 1K
7.5V = 5V * 1.5
https://en.wikipedia.org/wiki/Operation ... _amplifier
It's a good idea to use an Op Amp With a DAC anyway as often the DAC output has extremely low driving current and so an op amp even in unity gain mode (1:1 Input Voltage to Output Voltage) will provide a level of buffering and current amplification.
Beware not all op amps are made the same, some can handle rail to rail outputs and some cannot.
Regards Ben Rowland - MatrixTSL
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Flowcode Product Page - Flowcode Help Wiki - Flowcode Examples - Flowcode Blog - Flowcode Course - My YouTube Channel
- Jan Lichtenbelt
- Posts: 797
- Joined: Tue Feb 17, 2009 8:35 pm
- Location: Haren GN, the Netherlands
- Has thanked: 128 times
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Re: DAC 7V output
The forum https://www.circuitsonline.net/forum/ learned me the OpAmp OPA547. This OpApm needs a voltage between 8 and 60V with a 500 mA output.
It is very interesting for microcontroller user, because the DAC output can directly control the output current of this OpAmp. Just what I need.
Kind regards
Jan Lichtenbelt
PS. OPA in Dutch means grandfather in English. That is in agreement with my age.
It is very interesting for microcontroller user, because the DAC output can directly control the output current of this OpAmp. Just what I need.
Kind regards
Jan Lichtenbelt
PS. OPA in Dutch means grandfather in English. That is in agreement with my age.