LM2904LV: Vee-1.5V ABS opamp

Hideki Hayashi1

Part Number: LM2904LV

Hi team,

Customer sometimes see the VIN- is -1.5V with Vee=GND when using LM2904LVIDDFR.

Is there any opamp which are able to stand this negative voltage without supplying negative voltage?

Regards,

Hayashi

0 Clemens Ladisch over 1 year ago

Guru 287370 points

As far as I know, all opamps have negative clamping diodes, which must be protected.

A series resistor of more than 100 Ω in front of the input would limit the current through the diode to a safe < 10 mA.

0 kai klaas69 over 1 year ago

Guru 140200 points

Hi Hayashi,

figure 2-7 of this appnote shows a suited protection circuit:

Kai

0 Ron Michallick over 1 year ago

Hello Hayashi-san,

On front page of the data sheet is "The op amps are stable at unity gain, and do not have reverse phase in overdrive conditions."

Be sure that there is enough input resistance to keep input current well below 10mA , 10mA is in absolute maximum table.

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