[time-nuts] Re: Temperature accuracy / repeatability / drift of double ovens

[Ed Marciniak]

Yes, that’s the one. A bit expensive, but current production.

My guess is it's probably used for DWDM lasers in telecom.

That said, call your local office and ask for a couple samples.

I still think it would make a fine way to use AT cut crystals instead of SC because it will no longer matter if the crystal you have happens to have a turnover above or below rooom temperature....and there are two turnover temperatures...you could use either of above ambient is no longer a requirement.

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________________________________
From: Lux, Jim via time-nuts <time-nuts at lists.febo.com>
Sent: Friday, March 31, 2023 6:27:59 PM
To: time-nuts at lists.febo.com <time-nuts at lists.febo.com>
Cc: Lux, Jim <jim at luxfamily.com>
Subject: [time-nuts] Re: Temperature accuracy / repeatability / drift of double ovens

On 3/31/23 4:04 PM, Richard (Rick) Karlquist via time-nuts wrote:
> I believe that IC went out of production decades ago.
>
> Rick
>
https://www.analog.com/en/products/ltc1923.html#product-overview


High Efficiency Thermoelectric Cooler Controller

Example circuit is 0.01degree.

Eval boards available too DC388C and DC491A


Looks like a $40 part, with a $150 eval board.






> On 3/31/2023 11:13 AM, Ed Marciniak via time-nuts wrote:
>> Linear technology made a thermoelectric full H bridge temperature
>> controller. At the time, I’d like to say it came as a lot of two
>> components. The second was an op-amp that may have been selected or
>> trimmed unless there was a good reason to include it with samples
>> (maybe less commonly available).
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