What Is The Difference Between Op Amps And Comparators - however both op s and parators often share this mon problem unwanted oscillation application issues the operational lifier is intended for linear operation where the output may be at any voltage within the limits of the power supply rails the voltage parator is simply a 1bit analog to digital converter where the output is always in positive or negative saturation so in every case you could use an op as a parator or a parator as an op if your requirements are not very demanding given the difference in how the parts are specified it may not be possible to know from the specifications how it will even perform p div div class b algotextcarousel id ce carousel 1408614795 2 div id slideexp1 69160ec class b slideexp data wire i slideexp init b select i f selected o f active o data control id slideexp1 69160e data appns serp data k 5357 1 data stk div class b overlay div id slideexp1 69160echevrons.

prevbtn class btn disabled prev rounded bld data dir div class bg span span div div class vcac div style height 32px margin top 16px div class cr div div div div div div div id slideexp1 69160echevrons nextbtn class btn disabled next rounded bld data dir div class bg span span div div class vcac div style height 32px margin top 16px div class cr div div div div div div div div class b viewport div class b slidebar id slideexp1 69160e role list aria label please use arrow keys to navigate div class slide data dataurl data rinterval data appns serp data k 5348 1 tabindex 0 role listitem a href https electronics stackexchange a 72982 h id serp 5347 1 div class b insideslide div class b text as a first approximation there isn t a difference a similar question might be what s the difference between a dc motor and a generator either will function in either capacity but each is optimized.

to maximize certain qualities at the expense of others according to the intended application let s pare the internal schematic for a mon op tl072 and a mon parator lm339 tl072 lm339 things in mon differential pair input very high gain differences the tl072 uses jfets for the input this is because jfets provide extremely high input impedance which is desirable for an op most op analysis assumes that the bias currents the currents moving through the inputs are zero but this is only true to the extent that the input impedance is infinite for a parator you do want high input impedance to avoid loading the source excessively but it s not so important that input impedance is very high the lm339 has an open collector output for a parator this is good because it allows it to interface with any number of output voltages through a pull up resistor or trivially implement a wired or bus you.

wouldn t want this for an op because usually you want an op to be as good at sourcing current as sinking it so that your output waveform is symmetrical notice the npn pnp push pull pair output of tl072 the lm339 can pull the output as low as 0 2v or as high as v cc by virtue of its open collector output tl072 specifies an output voltage swing of pm 10v when vcc 15v when the load is less than 2k omega an experienced ic designer could probably point out more differences from the schematic alone i m not one of those but i can see the differences in the datasheets for ex le i don t see a mon mode or power supply rejection ratio harmonic distortion or noise figure specified at all for lm339 these could be measured for a parator and you will find them in every op datasheet but for a parator application these parameters aren t especially relevant so they aren t specified and if they were would.

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