RTD Interface chip needed

Started by jvoytovich March 15, 2009
Hi,

I've got an application where an existing RTD interface circuitry needs upgrading, and I'm looking for a custom chip that will handle the current sourcing and amplification necessary. The current circuit is composed of op amps, resistors and caps, and I would think there would be a single chip solution for this, possibly one that might also have a built-in ADC of 12 bits or more, and have an SPI interface.

I know that Christmas is a ways off, but a chip like this would save us a lot of board space. Seeing that RTD interfacing is a very common application, one would think some chips would habdle this.

Thanks all.

You would think that would be a common chip, but I've yet to find one. One
option is to change
to K-Thermocouples and use a MAX6675. The other is to use a RTD transmitter
(Omega $75
fits in protective head output 4-20ma) then use a PIC or A/D to get what
you need. The upside
is quick integration and they come already calibrated (What's your time
worth). For a small
batch it's probably the best way to go.
Hi,

I've got an application where an existing RTD interface circuitry needs
upgrading, and I'm looking for a custom chip that will handle the current
sourcing and amplification necessary. The current circuit is composed of op
amps, resistors and caps, and I would think there would be a single chip
solution for this, possibly one that might also have a built-in ADC of 12
bits or more, and have an SPI interface.

I know that Christmas is a ways off, but a chip like this would save us a
lot of board space. Seeing that RTD interfacing is a very common
application, one would think some chips would habdle this.

Thanks all.
Hi,

I use the AD7705 for RTDs.

16 bits ADC and SPI.

Van: p... [mailto:p...] Namens S
Bakaletz
Verzonden: zondag 15 maart 2009 20:18
Aan: p...
Onderwerp: RE: [piclist] RTD Interface chip needed

You would think that would be a common chip, but I've yet to find one. One
option is to change

to K-Thermocouples and use a MAX6675. The other is to use a RTD transmitter
(Omega $75

fits in protective head output 4-20ma) then use a PIC or A/D to get what
you need. The upside

is quick integration and they come already calibrated (What's your time
worth). For a small

batch it's probably the best way to go.

Hi,

I've got an application where an existing RTD interface circuitry needs
upgrading, and I'm looking for a custom chip that will handle the current
sourcing and amplification necessary. The current circuit is composed of op
amps, resistors and caps, and I would think there would be a single chip
solution for this, possibly one that might also have a built-in ADC of 12
bits or more, and have an SPI interface.

I know that Christmas is a ways off, but a chip like this would save us a
lot of board space. Seeing that RTD interfacing is a very common
application, one would think some chips would habdle this.

Thanks all.
Hello,

I need to hire a PIC programmer who is also a musician that fully understands MIDI.

Company is in Michigan, but that doesn't mean you would have to re-locate.

JT

----- Original Message -----
From: Michiel Nijst
To: p...
Sent: Sunday, March 15, 2009 3:06 PM
Subject: RE: [piclist] RTD Interface chip needed

Hi,

I use the AD7705 for RTDs.

16 bits ADC and SPI.

Van: p... [mailto:p...] Namens S Bakaletz
Verzonden: zondag 15 maart 2009 20:18
Aan: p...
Onderwerp: RE: [piclist] RTD Interface chip needed

You would think that would be a common chip, but I've yet to find one. One option is to change

to K-Thermocouples and use a MAX6675. The other is to use a RTD transmitter (Omega $75

fits in protective head output 4-20ma) then use a PIC or A/D to get what you need. The upside

is quick integration and they come already calibrated (What's your time worth). For a small

batch it's probably the best way to go.

Hi,

I've got an application where an existing RTD interface circuitry needs upgrading, and I'm looking for a custom chip that will handle the current sourcing and amplification necessary. The current circuit is composed of op amps, resistors and caps, and I would think there would be a single chip solution for this, possibly one that might also have a built-in ADC of 12 bits or more, and have an SPI interface.

I know that Christmas is a ways off, but a chip like this would save us a lot of board space. Seeing that RTD interfacing is a very common application, one would think some chips would habdle this.

Thanks all.

------

No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 8.0.237 / Virus Database: 270.11.15/2004 - Release Date: 03/16/09 07:04:00
Well I'm not a musician, though certainly exposed
to it for much of my life (ex wife is first chair
french horn, mother was a pianist, grandfather
was an operatic singer) I just never picked it up myself (rebellion maybe?).

However, Midi I understand, its a protocol the
same as anything else. In fact its used in many
non-music applications as well (xmas lights spring to mind).

What do you have in mind?

At 11:43 AM 3/15/2009, you wrote:
>Hello,
>
>I need to hire a PIC programmer who is also a
>musician that fully understands MIDI.
>
>Company is in Michigan, but that doesn't mean you would have to re-locate.
>
>JT
>
>----- Original Message -----
>From: Michiel Nijst
>To: p...
>Sent: Sunday, March 15, 2009 3:06 PM
>Subject: RE: [piclist] RTD Interface chip needed
>
>Hi,
>
>I use the AD7705 for RTDs.
>
>16 bits ADC and SPI.
>
>Van:
>p...
>[mailto:p...] Namens S Bakaletz
>Verzonden: zondag 15 maart 2009 20:18
>Aan: p...
>Onderwerp: RE: [piclist] RTD Interface chip needed
>
>You would think that would be a common chip, but
>I've yet to find one. One option is to change
>
>to K-Thermocouples and use a MAX6675. The other
>is to use a RTD transmitter (Omega $75
>
>fits in protective head output 4-20ma) then use
>a PIC or A/D to get what you need. The upside
>
>is quick integration and they come already
>calibrated (What's your time worth). For a small
>
>batch it's probably the best way to go.
>
>Hi,
>
>I've got an application where an existing RTD
>interface circuitry needs upgrading, and I'm
>looking for a custom chip that will handle the
>current sourcing and amplification necessary.
>The current circuit is composed of op amps,
>resistors and caps, and I would think there
>would be a single chip solution for this,
>possibly one that might also have a built-in ADC
>of 12 bits or more, and have an SPI interface.
>
>I know that Christmas is a ways off, but a chip
>like this would save us a lot of board space.
>Seeing that RTD interfacing is a very common
>application, one would think some chips would habdle this.
>
>Thanks all.
>----------
>
>No virus found in this incoming message.
>Checked by AVG - www.avg.com
>Version: 8.0.237 / Virus Database:
>270.11.15/2004 - Release Date: 03/16/09 07:04:00
>
>No virus found in this incoming message.
>Checked by AVG - www.avg.com
>Version: 8.0.238 / Virus Database:
>270.12.12/2090 - Release Date: 05/01/09 06:17:00