Pages: [1]   Go Down
Author Topic: Which term describe the max output swing of an op-amp?  (Read 470 times)
0 Members and 1 Guest are viewing this topic.
Offline Offline
Full Member
***
Karma: 0
Posts: 213
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

I have been trying to find the term that explains the max output swing possible for LM358N dual op-amp with 5V. Can someone point me to this information? But the data sheet doesn't seem to give me this information.
Logged

Offline Offline
Full Member
***
Karma: 0
Posts: 213
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

I mean the VOH and VOL of the op-amp? Datasheet only mention for Vcc = 30V
Logged

United Kingdom
Offline Offline
Tesla Member
***
Karma: 224
Posts: 6619
Hofstadter's Law: It always takes longer than you expect, even when you take into account Hofstadter's Law.
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

As you say, the datasheet only gives the data on Voh for a 30v supply. If you want a guaranteed output swing on a single 5v supply, you could go for something like LMV358, see http://www.farnell.com/datasheets/1383727.pdf. Unfortunately these are only available in SMD packages afaik, however you can buy adapters to convert them to DIP.
Logged

Formal verification of safety-critical software, software development, and electronic design and prototyping. See http://www.eschertech.com. Please do not ask for unpaid help via PM, use the forum.

0
Offline Offline
Shannon Member
****
Karma: 206
Posts: 12179
Arduino rocks
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

"Output voltage swing" works for me...  Also the graphs "Output Characteristics Current Sourcing" and "Output Characteristics Current Sinking" go into full detail of drive capability.
Logged

[ I won't respond to messages, use the forum please ]

Offline Offline
God Member
*****
Karma: 4
Posts: 813
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

I have been trying to find the term that explains the max output swing possible for LM358N dual op-amp with 5V. Can someone point me to this information? But the data sheet doesn't seem to give me this information.

How about you get a rail-to-rail 5V op amp, and you'll know you get 5V swing? (plus or minus a few dozen millivolts) Something like that MCP602?
http://search.digikey.com/us/en/products/MCP602-I%2FP/MCP602-I%2FP-ND/305932
Logged

0
Offline Offline
Shannon Member
****
Karma: 206
Posts: 12179
Arduino rocks
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

You have to realise that "rail-to-rail" outputs don't go fully to the rails if you actually load them - the current from them affects how close they can drive to the rail.  Also I believe the bandwidth/slew-rate is greatly reduced when driving close to the rails...

Some are very good (use both FET and BJT in output stage IIRC), but in general you have to be wary of this limitation.  The LM258 family seem pretty good if lightly loaded if you look at the graphs.
Logged

[ I won't respond to messages, use the forum please ]

Pages: [1]   Go Up
Jump to: