Tricks to boost LM358 swing

[Jim Spears]

What is best design practice for maximizing output swing on one amp of
the LM358?

Any specific recommendations would be appreciated. Supply is 6V. Input
frequency 60 Hz. Load 20mA.

Would a slightly better specified (low power) replacement, such as a
TL062, improve prospects in this regard?

Or is there a better choice in this price/performance category.

Jim

 

[Luhan Monat]

Jim Spears wrote:

What is best design practice for maximizing output swing on one amp of
the LM358?

You cant, it is fixed for any specific supply voltage.

Any specific recommendations would be appreciated. Supply is 6V. Input
frequency 60 Hz. Load 20mA.

Would a slightly better specified (low power) replacement, such as a
TL062, improve prospects in this regard?

Or is there a better choice in this price/performance category.

Jim

If you want maximum output swing, use CMOS with rail-to-rail outputs.

--
Luhan Monat (luhanis 'at' yahoo 'dot' com)
"The future is not what it used to be..."
http://members.cox.net/berniekm

 

[John Popelish]

Jim Spears wrote:

What is best design practice for maximizing output swing on one amp of
the LM358?

Any specific recommendations would be appreciated. Supply is 6V. Input
frequency 60 Hz. Load 20mA.

Would a slightly better specified (low power) replacement, such as a
TL062, improve prospects in this regard?

Or is there a better choice in this price/performance category.

Jim

Unless you have to use the lowest possible cost amp, I would suggest
you look at something made for such applications, like:
http://rocky.digikey.com/WebLib/Analog%20Devices/Web%20Data/AD8532.pdf
Pulls to within .1 volt from rails at 20 ma current.

--
John Popelish

 

[Winfield Hill]

John Popelish wrote...

Jim Spears wrote:

What is best design practice for maximizing output swing on one amp
of the LM358? Any specific recommendations would be appreciated.
Supply is 6V. Input frequency 60 Hz. Load 20mA.

Unless you have to use the lowest possible cost amp, I would suggest
you look at something made for such applications, like:
http://rocky.digikey.com/WebLib/Analog%20Devices/Web%20Data/AD8532.pdf
Pulls to within .1 volt from rails at 20 ma current.

The AD8532's 250mA output capability is impressive, but its 2.7 to 6V
total recommended operating-voltage range is rather limited, even if
it does meet the OP's requirement and is fairly low cost (64 cents,
DigiKey qty 100). For a jelly-bean recommendation (implies second-
source and long product life) I'd prefer a general-purpose part that
can handle higher 16V supply voltages, like the TLC272 or LMC6482.
One other issue, the AD8532 has a rather high offset-voltage spec,
25mV vs. 10 and 3mV maximum for the other two parts. That may not be
much of a problem for a LCD or headphone driver, but...


--
Thanks,
- Win