LMC6482

Hi Lawrence,

Sorry. I cannot find any char data at 15V, and we do not test offset voltage at 15V in production, but we can infer the max from the PSRR spec.

The PSRR spec conditions is from 5V to 15V, so it would give us the maximum expected offset change from 5V to 15V.

The worst-case PSRR spec is 60db over temp. 60dB = 1mV offset change per supply Volt (1mV/V)

The supply change is 10V, so the worst case offset change would be  10*1mV = 10mV. Though that sounds a bit high...the max number is obviously "padded".

The typical PSRR is 82dB (I'll use 80 since it is a nice round number), so 80dB is 100uV./V, or 1mV change over 10V. That sounds more believable.

So if you are using the "AI" version, the max over temp offset is 1.35mV, so if we add the worst case 10mV, that makes it ±10.35mV max offset over temperature. Again, that seems high - I doubt it would get that bad. 2-3mV sounds more reasonable, and even that sounds a bit high. My experience is that the offset changes less than that...maybe a few hundred microvolts (aligning with the "typ' number).

Drift is typical, we do not have limits. Are you asking temp drift, or over time? I do not see any long term drift data.

Regards,

Hi Paul,Thnaks for your reply.
For the Max Input Offset Voltage Average Drift what is the V/°C?Regards,
Lawrence Stoner

Hi Lawrence,

Yes. The typical is 1uV/°C, or a change of one micro volt for every degree Celsius. So if the offset is ±1mV at 25°C, then the offset at 85°C will change 85°C - 25°C = 60, 60* 1uV = 60uV, so the expected offset at 85C would be ±1.06mV

Regards,