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LM358: LM358 current error

user1932012
Intellectual 750 points

Part Number: LM358

We use TI's LM358 operational amplifier on the motherboard, and there is a problem of different magnification performance consistency in practical applications.

Input Voltage: 1500mV*100/10100=14.85mV Amplification: G1=G2=16 output Voltage 1:225.36mV output Voltage 2:3605.76mV

SN

LM358（mV）

SGM8632（mV）

 

OUT1

G1

OUT2

G2

OUT1

G1

OUT2

G2

 

1

225.0

15.2

3757.0

16.7

261.4

17.6

4112.0

15.7

 

2

237.2

16.0

3732.0

15.7

252.7

17.0

3964.0

15.7

 

3

227.6

15.3

3598.0

15.8

247.4

16.7

3893.0

15.7

 

4

230.2

15.5

3618.0

15.7

253.5

17.1

3990.0

15.7

 

5

233.3

15.7

3683.0

15.8

238.3

16.0

3763.0

15.8

 

6

219.3

14.8

3456.0

15.8

252.3

17.0

3981.0

15.8

 

7

239.8

16.1

3759.0

15.7

232.5

15.7

3670.0

15.8

 

8

242.0

16.3

3761.0

15.5

250.0

16.8

3943.0

15.8

 

9

201.2

13.5

3182.0

15.8

249.5

16.8

3914.0

15.7

 

10

237.5

16.0

3736.0

15.7

227.4

15.3

3561.0

15.7

 

11

243.6

16.4

3757.0

15.4

254.9

17.2

4032.0

15.8

 

12

238.0

16.0

3757.0

15.8

243.1

16.4

3825.0

15.7

 

13

233.1

15.7

3676.0

15.8

240.3

16.2

3805.0

15.8

 

14

240.5

16.2

3761.0

15.6

239.7

16.1

3775.0

15.7

 

15

232.6

15.7

3667.0

15.8

221.0

14.9

3481.0

15.8

 

16

223.7

15.1

3547.0

15.9

　

　

　

　

 

17

243.4

16.4

3762.0

15.5

　

　

　

　

 

18

246.9

16.6

3763.0

15.2

　

　

　

　

 

19

235.9

15.9

3717.0

15.8

　

　

　

　

 

20

233.6

15.7

3688.0

15.8

　

　

　

　

 

21

226.1

15.2

3566.0

15.8

　

　

　

　

 

22

227.9

15.3

3602.0

15.8

　

　

　

　

 

23

237.8

16.0

3747.0

15.8

　

　

　

　

 

24

232.8

15.7

3663.0

15.7

　

　

　

　

 

25

240.6

16.2

3762.0

15.6

　

　

　

　

 

26

228.5

15.4

3602.0

15.8

　

　

　

　

 

27

233.1

15.7

3668.0

15.7

　

　

　

　

 

28

236.0

15.9

3714.0

15.7

　

　

　

　

 

29

233.8

15.7

3692.0

15.8

　

　

　

　

 

30

235.7

15.9

3708.0

15.7

　

　

　

　

 

  • 0
    TI__Guru**** 170036 points

    Hello User,

    Thanks for the table. I found that OUT1 is working well. OUT1 = 16 * VIN + 16 * VIO. VIN was 14.85mV and VIO was calculated to be between -2.14mV and +0.55mV which is a passing value per data sheet. I found that OUT2 is limited by VCC and I suspect VCC is 5V. The output of LM358 is not rail to rail, and VOH is well under VCC. VOH specification for 5V (at 25C) is 3.5V

  • 0 in reply to Ron Michallick
    TI__Guru**** 170036 points

    User,

    Here is OUT2 vs. OUT1 and the VOH limiting is obvious. The one dot that is out of place was likely a typographical error for SN1 value. changing  3.757 to 3.557 would bring it back into line.