Differential input to single-ended

[booblik]

Hi all,

I have a differential signal, around 1MHz frequency, and 3.3 volt. What would be the simplest way to turn it into a single-ended signal, which is to be fed to an ADC.

Thanks,

 

[keith1200rs]

It depends. Is the signal high or low impedance? If low impedance then an opamp.

Keith

 

[design_oriented]

Don't ADC's normally have low input impedance (1 - 10k)?

The LF356 is a good general purpose OPAMP which you can use.

 

[keith1200rs]

I was talking about the impedance of the signal source not the ADC. The input impedance of an ADC depends on the type of ADC. Generally you want to drive them with a low impedance.

If you signal source is high impedance then an instrumentation amplifier might be a better choice.

Keith

 

[love_analog]

Why can't you just use a simple comparator.

 

[keith1200rs]

Why can't you just use a simple comparator.

Because a comparator doesn't turn differential analog signals into single ended!

Keith

 

[love_analog]

oops sorry...I misread the question. Its single ended analog output not single ended differential output.

Added after 3 seconds:

oops sorry...I misread the question. Its single ended analog output not single ended digital output.

Added after 9 seconds:

oops sorry...I misread the question. Its single ended analog output not single ended digital output.

 

[kwkam]

This have a very common design. You can goto OPA2134 datasheet and there are application circuit of diff to SE circuit