Can this comparator accept negative voltage as its negative supply?

In summary, the LM 319 high speed comparator can accept negative supply voltage, within a range of ±18 V or +11 V to -25 V. The output ranges between approximately Vs+ and ground, with the option to choose a different 0 V reference for ground. However, the output cannot exceed the maximum rating of 16 V between ground and Vcc, so a different op amp may be needed for a ±10 V output.
  • #1
Mr su
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TL;DR Summary
LM 319 high speed comparator.
I check the datasheet of LM 319 high speed comparator online. I was wondering if LM 319 can accept negative supply voltage(-10V) and its possible to produce a 10V to -10V square wave which oscillates along origin rather than just 10V to 0v as shown below.
 

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  • #2
LM319 can accept negative supply, eg power rails up to ±18 V or +11 V to -25 V (with ground at 0V)
Within those (and other) parameters, it doesn't matter what absolute values you assign the three voltages (at least until you connect to another circuit!)

As far as I can see from the datasheet, the output ranges between approx Vs+ and ground.
Vs- can be ground or negative of ground.

There is no law that says ground has to be your 0 V reference, so you could have Vs+ as say +5 V, gnd as -5 V and Vs- as -6 V to achieve an output roughly symmetrical about 0 V. (Only approx as the output does not reach exactly the power rail nor ground.
But you cannot reach peak to peak output of 20 V (±10 V) because that would exceed the maximum rating of 16 V between ground and Vcc.

You could follow the oscillator with a buffer stage, whose job was simply to amplify the signal and limit the output to ±10 V. That would require a different op amp. But then you could just use that alone as the osc., if you only wanted a rough output !

So for what you ask, I think I'd use a different op amp.
 

1. Can a comparator accept negative voltage as its negative supply?

Yes, some comparators are designed to accept negative voltage as their negative supply. However, it is important to check the datasheet of the specific comparator to ensure that it is capable of handling negative voltage.

2. What is the purpose of using negative voltage as the negative supply for a comparator?

Negative voltage can be used as the negative supply for a comparator to allow for a wider input voltage range. This can be useful in certain applications where the input signal may vary greatly in polarity.

3. Can all comparators handle negative voltage as their negative supply?

No, not all comparators are designed to handle negative voltage as their negative supply. It is important to check the datasheet of the comparator to determine its capabilities.

4. How does using negative voltage as the negative supply affect the performance of a comparator?

Using negative voltage as the negative supply can affect the performance of a comparator in terms of its speed, accuracy, and noise. It is important to select a comparator that is specifically designed to handle negative voltage if it is required for the application.

5. Are there any precautions that need to be taken when using negative voltage as the negative supply for a comparator?

Yes, it is important to ensure that the negative voltage supply is within the specified range for the comparator and that it is stable and free from any noise or ripple. Additionally, proper decoupling and grounding techniques should be used to minimize any potential issues.

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