RC4558 maximum voltage swing

Kum Hoo Lee

Other Parts Discussed in Thread: RC4558

Hi,

May I know what is the maximum voltage swing for RC4558 with below condition? I can't find it from the datasheet. Need advise. Thank you very much!

Vin= +/- 5V

Load= 10kohms

Thanks and best regards,

over 8 years ago

0 Gerald Schwarz over 8 years ago

Prodigy 40 points

Look in the datasheet on page 5 in the table 6.5 the line VOM. Then you can calculate it with your condition.
Gerald

0 Ron Michallick over 8 years ago

TI__Guru*** 140026 points

Kum Hoo

Output will be typically +/-4V. It can be a little less at cold temperature, a little more at high temperature.
I expect worst case would be > +/-3.5V

0 Kum Hoo Lee over 8 years ago in reply to Ron Michallick

Expert 1855 points

Hi Ron,

Thanks for the reply, may I know is there anyway to do the calculation to get the output you have mentioned?

Best regards,
KH

0 Ron Michallick over 8 years ago in reply to Kum Hoo Lee

TI__Guru*** 140026 points

KH,

I looked at table 6.5 typical 10k VOM, schematic on page 9, and typical chart, figure 5 (2k chart).
At +/-5V there will be less load current, so VOM will be closer to rail than supply at +/-15V.
Temperature effect is mostly base emitter voltage which is -2mV/C. At -40C, output will be +/-130mV less. (than 25C)
+/-3.5V worst case estimate is conservative value based on the known factors and margin for variance.

Now there is a decision point. Is this output range acceptable?
If not, consider higher supply voltage or another device with rail to rail output.

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RC4558 maximum voltage swing