LM124: Non-inverting terminal

Jonathan Navor

Part Number: LM124

Hi Experts,

We need your assistance with our customer.

Pin number 11 of LM124 is given to -15V in our design.
Can the input voltage at the non-inverting terminal (pin number 3) go up to -15.3V (0.3V less than -15V)? The datasheet mentions only -0.3V as the lower limit for the input and if this limit is crossed, the output of LM124 can go to V or ground. Is V the positive supply voltage or high impedance?

Thank you in advance for your support.

Best regards,

Jonathan

over 1 year ago

+1 Clemens Ladisch over 1 year ago

Guru 284830 points

It means VCC+. See the LMx24 application note for details.

0 Jonathan Navor over 1 year ago

TI__Genius 9475 points

Hi Clemens,

One more thing.

Jonathan Navor said:
Can the input voltage at the non-inverting terminal (pin number 3) go up to -15.3V (0.3V less than -15V)?

Kindly clarify whether the non-inverting terminal (pin number 3) of LM124 can be given -15.3V when its pin number 11 is given -15V.po

Thank you for your support.

Best regards,

Jonathan

+1 Clemens Ladisch over 1 year ago in reply to Jonathan Navor

Guru 284830 points

The absolute maximum ratings allow 0.3 V less than the negative power supply. For any lower voltage, the clamping diodes can begin to conduct. See the application note.

0 Jonathan Navor over 1 year ago in reply to Clemens Ladisch

TI__Genius 9475 points

Hi Clemens,

Thank you for the clarification.

Best regards,

Jonathan

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LM124: Non-inverting terminal