Part Number: LMV324
1. The LMV324IDR is used for three op amp instrumentation amplifier circuits. The normal operation of the chip at the first stage of amplification is 14.3 (resistance parameters are the same,Unusual deviations in the first-level amplification of the chip, eg 16.6 times, 10.2 times) Misaligned die soldering is still abnormal on qualified PCB boards.The abnormal PCB board is normal after replacing the customer's chip.I would like to ask if this is the quality of my chip or the customer's circuit design? Or is the computing range of this LMV324 unable to meet the needs of customers?
2. The suffix of the material previously used by the customer is G4. I now give them LMV324 with G3 suffix. The customer uses G4, and G3 cannot. I would like to ask what is the difference between G3 and G4? I have inquired that the G4 was produced overseas. It seems that it is Mexico or Malaysia. The G3 is made in China. Is it? If the origin is not the same, but this does not affect the parameters inside there is a big difference can not be used!
3. I went back to the client yesterday and also took the LMV324IDR tail of the Malaysian origin to test the G4, but it was also the same as the G3 that was sent to the customer before. The magnification was unstable and the fluctuation data was relatively large.There are 12 bad chips in the 2000 chips, a difference of 800 times. I took a test that was given to my own engineer. But it was bad to measure this material, but it did not break down. Now you can help analyze what is the reason.
Regards,Ronald MichallickLinear Applications
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In reply to Ron Michallick:
In reply to Eric Cui13:
In reply to kai klaas69:
Hi Eric, without knowing more about the circuitry at the input of LMV324 I can only speculate that it has to do with the fact that the LMV324 cannot go fully down to 0V at its output. Eventually you should take an OPAmp which can swing from rail to rail at the output (RRIO). Also, the LMV324 has a high offset voltage, which is in the range of your measuring signal. So, you should eventually look for a better OPAmp. Kai
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