LMV358: Meaning of "Output Voltage Swing From Rails vs Supply Voltage" figure in data sheet of LMV358ID

Thanks. It was staring me in the face. Completely blind to the positive swings overlaying for the LMV3xx & LMV324S. No mention in 6.7/6.8 of the LMV324S, References to that part seem to have been removed from the text of the data sheet, but not the figures.

Thanks. It's a shame that there is only data for loads of 2K and 10K, with no indication of the negative swing when driving a high impedance load such as a MCU ADC pin. A National Semi DS (DS007787 Oct 05) for the LM358A has an Output Characteristics Current Sinking graph that covers currents from 1uA to 100mA, but there's no comparable information for the TI LMV358.

Figure 13 shows that the output can do rail-to-rail.

Yes. Presume that figure is for +/- 2.7V operation and behavior would translate to different single supply of 3V. Section 6.8 swing covers the case of 2.5V/2k = 1.25mA & 2.5V/10k 250uA, with significant reduction of the negative output swing by approx. half. Based on the the bottom left grid of Figure 13 it's hard to infer how the negative/0V rail swing figures might fall further for lighter loads. In the absence of that information for load currents of say <10uA for a 3V single supply then I could only call on the negative output swing figures from Section 6.7 in a design, as far as I can see.

Thanks Ron. That's interesting to know. How does the LMV358-N and LM358LV compare to these?

Chris,

LMV358-N is anti-saturation NPN; LM358LV is NMOS drain. 

Hi Chris,

I would not focus all too much on ultra low output saturation voltage. Keep in mind that the OPAmp will leave its linear operating range when the output slams into saturation. The settling time of OPAmp can suffer as well. You should plan enough headroom to prevent output saturation.

What ADC do you use?

Kai

Hi Kai. It's a 12-bit ADC peripheral integral to a MCU.

I wondered if the LMV358-N was an acquired National Semi variant of the LMV358, as mentioned for the LM358-N here https://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/809184/faq-lm358lv-what-is-the-difference-between-the-lm358-lm358b-and-lm358lv-op-amp-replacements

Yes, "-N" indicates National Semiconductor devices with an otherwise conflicting name.