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From: Fred Bartoli on 4 Feb 2010 19:14
Spehro Pefhany a �crit :
> On Thu, 04 Feb 2010 02:03:10 +0100, Fred Bartoli <" "> wrote:
>
>> Joerg a �crit :
>>> Fred Bartoli wrote:
>>>> It's a primer for me, but it had to happen one day or another...
>>>>
>>>> I've a product designed and working using one such small 4-20mA IC for
>>>> a customer (a one manned business).
>>>>
>>>> The customer manages the subcontracted production and also managed to
>>>> get short of those XTR117, which next production run from TI seems to
>>>> be due by the end of April.
>>>>
>>> Interesting. It is not the first time with this chip.
>> What kind of stories?
>>
>>> Suggest to move to
>>> another 4-20mA transceiver but I guess for your client it's too late. TI
>>> seems to have some logistics issues lately.
>>>
>>>
>> Unfortunately, that one is 'the' one. Without it the product can't exist :-(
>
> Is this one of those things that has to live inside a 6mm (0.25")
> tube?
>

No, it's not that one, and it sure wouldn't fit there with all the other
components. Fortunately, the smaller ones are not 4-20mA and have direct
analog output. Include protections, though...

One is already finished, one sided and 21 components on the 7mm dia.
The other one is under development and is dual sided with 33 components.
all that with the connection pads. All those mounted in a TO5 packaging.
That's scary at first sight...


> I doubt they (Burr-Brown) got much market penetration. In the process
> control market design lives are very long and there is little reason
> to change from (relatively) jellybean precision op-amps, references
> and discretes once a product is designed.
>
> And newer stuff is moving away from analog 4-20mA to fieldbuse and
> other digital and hybrid analog/digital (eg. Hart) protocols.




--
Thanks,
Fred.
From: Joerg on 4 Feb 2010 19:26
Fred Bartoli wrote:
> Spehro Pefhany a �crit :
>> On Thu, 04 Feb 2010 02:03:10 +0100, Fred Bartoli <" "> wrote:
>>
>>> Joerg a �crit :
>>>> Fred Bartoli wrote:
>>>>> It's a primer for me, but it had to happen one day or another...
>>>>>
>>>>> I've a product designed and working using one such small 4-20mA IC
>>>>> for a customer (a one manned business).
>>>>>
>>>>> The customer manages the subcontracted production and also managed
>>>>> to get short of those XTR117, which next production run from TI
>>>>> seems to be due by the end of April.
>>>>>
>>>> Interesting. It is not the first time with this chip.
>>> What kind of stories?
>>>
>>>> Suggest to move to another 4-20mA transceiver but I guess for your
>>>> client it's too late. TI seems to have some logistics issues lately.
>>>>
>>>>
>>> Unfortunately, that one is 'the' one. Without it the product can't
>>> exist :-(
>>
>> Is this one of those things that has to live inside a 6mm (0.25")
>> tube?
>
> No, it's not that one, and it sure wouldn't fit there with all the other
> components. Fortunately, the smaller ones are not 4-20mA and have direct
> analog output. Include protections, though...
>
> One is already finished, one sided and 21 components on the 7mm dia.
> The other one is under development and is dual sided with 33 components.
> all that with the connection pads. All those mounted in a TO5 packaging.
> That's scary at first sight...
>

Hey, don't complain :-)

I am sitting here, looking at how to cram several hundred sense channels
and more than a dozen amps into a tube that will be 2-3mm diameter. Oh,
plus some digital stuff. Of course it'll be a chip but even that has its
limits. Fighting the Rdson values right now.

<sweat beads dripping on floor>

[...]

--
Regards, Joerg

http://www.analogconsultants.com/

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