[volt-nuts] LTZ1000 project build

ian at ianjohnston.com ian at ianjohnston.com
Thu May 26 07:25:04 EDT 2016

Hi all,

TiN, out of interest I spent ages fishing for low ppm/degC resistors for my own reference......ended up with 2ppm units from DigiKey. Yes, they are expensive and send the BOM into the clouds!..............so I know how you feel!


----- Original Message -----
 From: Illya Tsemenko [mailto:illya at xdevs.com]
 To: volt-nuts at febo.com
 Sent: Thu, 26 May 2016 18:42:54 +0800
 Subject: [volt-nuts] LTZ1000 project build

 I'm glad my little project got so much attention. Worth to mention few 
points regarding my (or any other LTZ1000) unit:

A. One should consider cost of whole BOM, not only LTZ chip. In my case 
resistors from VPG exceed cost of LTZ1000 by far.
B. PCB I designed was targeted best to my own application need, where 
compact size and direct output (whatever is coming out of LTZ) were key 
importance. Since modules are part of bigger system with DAC synth, 
specific value, like 7.1500000 was not important for me.
C. If there is large enough group to have this project going, I can 
actually modify original design (e.g. for easier hand soldering, or 
added buffer or ratio circuits, onboard LDO, you name it) and get PCBs 
made for interested nuts, at small cost.

You can also find lot of temco/stability data with 
temperature/environment logs with mentioned LTZ modules on my site here: 
https://xdevs.com/services/ in LTZ1000 voltage reference tests section. 
RAW DSV data are available. I still have 3 modules at hand for any 
testing/checks (one was sold while ago, one was installed in HP 3245A 
source to replace LM399).

Illya "TiN" Tsemenko

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