Are TI Pspice models encripted?

Yep. Looks like TI is following LT's lead... models that will only run on TINA.

The posted PSpice model... while I've not yet tried it, looks like it only will do a Bode plot. I'll let you know. ...Jim Thompson

Yep, only Bode. TI will have its way with you >:-}

I just did a model for the TI LM94022 (no model released by TI), based entirely on the datasheet, which is in beta testing. I'll post as soon as it is blessed.

Perhaps I'll try the TPS54335, time permitting. The system modeling that the LM94022 goes into is a paying project, so it will dominate my time ;-) ...Jim Thompson

Damn, another bizarre National temperature sensor. I wonder why the slope is negative.

I like the specification...

SYM PARAMETER TYPICAL CL Output Load Capacitance 1100 pF (max)

So, that's a typical max?

The data sheet is similarly funny in other places. Figs 9, 16, 17, and

The LM35/45 series was a similar horror, with a nasty output stage, oscillation and latchup problems. Bob Pease promised me that he'd fix it, but he didn't get around to it.

You just need to read thru it thoroughly, actually the effects of the Cload values are easy to decipher.

What's vague is the deviation with load. If I didn't know CMOS well, it would be difficult to figure out what they mean. ...Jim Thompson

I especially enjoyed the first-page claim about how it can drive an ADC s/h circuit, and fig 18, which shows that it can't.

Why didn't they make it c-load stable?

Ask National/TI. I didn't design it, I just modeled it.

That you can't decipher some of the data (because you're CMOS illiterate) is your problem, not mine. ...Jim Thompson

I can read the data sheet. The PSRR, about 4 dB at 30 KHz, seems to be one of those CMOS virtues that you are so fond of.

Are you sure you didn't design this one?

Your ignorance and assholiness proceeds you >:-} ...Jim Thompson

You sputter when you can't think of any other noise to make.

Thing about CMOS is its terrible ratio of capacitance to transconductance. I've seen CMOS opamps that have PSRR *gain*.

You know not of what you speak, yet you shout like a leftist to be heard above the true facts.

Where'd you get that birdbrain idea the CMOS has a "...terrible ratio of capacitance to transconductance"? It doesn't. Most modern CMOS processes will do analog quite in excess of 500MHz without breaking a sweat.

Citing someone's crap product as a measure of all CMOS simply displays your fundamental ignorance of the subject... but that will not keep you from being loud >:-} ...Jim Thompson

That's slow in our business. We use opamps that have GBW up to 18 GHz and MMICS way past that. CMOS is a cheap workhorse but it's slow and noisy and low voltage and not very precise. And CMOS parts, in my experience, tend to be buggier than bipolar parts. Must be a different class of designers. The only really notable CMOS parts are chopamps and a few fA bias current amps.

Wanna stop babbling and actually compare some opamps, bipolar vs CMOS?

Start with something medium-fast, like AD8009 or THS3201, nice parts. Got a CMOS equivalent?

We could also compare low-noise, or high current, or low Ib opamps. Game?

This thread is about Spice modeling. What are you babbling about? Trying to make me responsible for _your_ ignorance? ...Jim Thompson

You made it about how fast analog CMOS is.

What are you babbling about?

I want to name and compare actual parts, and you don't. Who's ignorant here?

I guess that old hens are always still chickens.

Who uttered their profound statement of ignorance, "Thing about CMOS is its terrible ratio of capacitance to transconductance. I've seen CMOS opamps that have PSRR *gain*." ???

Anyone with half a clue knows that PSRR is referred to input for a reason... to hide the fact that there is always a frequency point above which ALL OpAmps have gain from supplies to output... bipolar's included.

I was designing bipolar integrated circuits while you were still in diapers. Sometimes I think you still are. ...Jim Thompson

You're still chicken, and still wrong.

If you dispute the gain:capacitance disadvantage of CMOS amps, name a CMOS opamp that's as fast as a bipolar THS3201. Or has the speed and input capacitance of a jfet ADA4817. Or comes anywhere near the specs of an AD8034.

Come on, try it.

Any questions/comments about the original topic, please post a response to this re-thread. ...Jim Thompson

Testing ...Jim Thompson

It works. Nobody's interested.