Re: OPA349 spice model acting weird

On Wed, 6 Jul 2005 20:02:37 +0200, "Helmut Sennewald"
<helmutsennewald@xxxxxxxxxxx> wrote:

>"Tom (at tomsweb.net)" <tomtorfs@xxxxxxxxxxxxxxxx> schrieb im Newsbeitrag
>news:1120650714.692137.269580@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>>> > I tried the model with LTspice and see the same problem as you
>>> > have described. I recommend you write a letter to AD.
>>> Sorry, it's TI and not AD,
>>
>> TI just confirmed that their model is crap (actually I would prefer
>> them not offering a model at all in that case!).
>>
>> --snip--
>> You were requesting the information about OPA349 Spice macro model. Our
>> OPA349 macromodel is not a very good one. It was written 5 years ago
>> and I've found that it does have some problems (Especially Low Voltage
>> problems,less than 3Volts) .Sorry for the inconvenience caused.
>>
>> You might want to consider using the TLV2401 device and the
>> specifications are almost similar to OPA349. The TLV2401 device has a
>> Spice model and it can be downloaded from TI website
>> (http://focus.ti.com/docs/prod/folders/print/tlv2401.html#productmodels
>> ).
>> --snip--
>>
>> I'm now simulating with the TLV2401 model, which works. However, the
>> real circuit will use a OPA349, because my supply is less than 2.5V
>> (the minimum for TLV2401).
>>
>> greetings,
>> Tom
>
>Hello Tom,
>
>thanks for this information. I will keep this message in my folder.
>
>It sounds like TI will not spend any money/time to correct
>this model. What a bad service to their customers when I assume
>that they eventually know since 5 years that the model is wrong.
>
>Best regards,
>Helmut
>

They (and others :) are not willing to spend the money it takes to
derive a good model.

But that provokes a question to you... Would you PAY for a good
model?

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

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