[sdiy] SSM2164 last time buys

[Oscar Salas]

Hello David,


> Here's what H&H has to say about the LM334 (2nd ed.,
> Section 16.18, p. 355):
> 
> "National makes a special 3-terminal device, the LM334,
> optimized for use as
> a low-power current source.  It comes in the small
> plastic transistor
> package (TO-92), as well as the standard DIP IC
> package.  You can use it all
> the way down to 1uA, because the "adj" current is a small
> fraction of the
> total current.  It has one peculiarity, however: The
> output current is
> temperature-dependent, in fact, precisely proportional to
> absolute
> temperature.  So although it is not the world's most
> stable current source,
> you can use it (Section 15.01) as a temperature sensor!"
> 
> Hmm.  Based on that, I'm wondering whether a simple
> resistor might not be
> the better choice for temperature stability.

I don't think temperature stability is important here. Just provide more current than the 2164 consumes. That maximum worst case was about 11mA , So providing 20mA the little deviation because temperature, I think will not affect the 2164