Getting crazy with an AD590

Apr 16, 2006 3 Replies

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rossi 20 years ago

Getting crazy with an AD590JH simply connected to a resistor of 11k/1% :

+5V---- | AD590 | -------*-------------o 11kOhm ^ -- Vo | | --- 0V --- 0V

Vo should be about 11mV/K but I measure 2.7V as indoor temperature (-24 °C!!).

According to you, where I'm wrong?

Thanks in advance

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Dave (from the UK) 20 years ago

My guess is that the resistor is too high given the suply voltage you have. I'd suggest decreating the resistor or increasing the supply voltage. The device needs a suppy voltage of 4 to 30 V, but with a 11 K resistor you have a lot less than that across the device.

Dave K MCSE. MCSE = Minefield Consultant and Solitaire Expert. Please note my email address changes periodically to avoid spam. It is always of the form: month-year@domain. Hitting reply will work for a couple of months only. Later set it manually.

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amdx 20 years ago

The Analog Devices pdf shows a series resistor of about

1000 ohms with a 6 volt supply.

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ZeroDue 20 years ago

amdx ha scritto:

Ok, I'll try. Is there some formula to obtain the resistor according to the supply?

Thanks to all.

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