What amplifier will recomended for my k-type theromocoupler using usb 6008

I recently do a project about temperature control system using usb 6008, according to the spec, the minimum AI range is +/- 1V and the thermocouple giv the voltages in jz a mV, so what kind of amplifier will be recomamded? is there any amplifier chip set that available ?

Analog Devices AD594/AD595 Monolithic Thermocouple Amplifiers (Type J / Type K)
This would give you a conversion of 10mv per degree C using a single +5v supply you could get to a couple of hundred C
I get 11 bits of resolution available for the +/- 4v range (11 because I can't see a negative supply available so we are only using one side of the differential range).
That's a resolution of 2048 bits over 4v giving 0.001953 v per bit
The devices above give 10 mv per degree C so you would have about 0.2 C resolution and a maximum temperature of around 450 degrees C an minimum temperature of 0 degrees C.
The device draws about 1mW so you should have no problems with power consumption. (Hint Earth / Ground loops might be a problem).
I should add that whilst I have used this device many hundreds of times, I have never applied it to the USB 6008.
http://www.analog.com/en/prod/0%2C2877%2CAD594%2C00.html
Message Edited by Conseils on 05-08-2007 08:51 PM
Message Edited by Conseils on 05-08-2007 08:52 PM
Attachments:
46185785AD594_fbs.gif ‏17 KB

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What amplifier will recomended for my k-type theromocoupler using usb 6008

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