[sdiy] SSI2130

[Neil Johnson]

Hi Tom,

> I'd somehow overlooked that the chip runs off a +5V supply!
>
> The -ve can go be anything down to -18V though.
> Is there any reason not to use the system -15V rail - for example, would
> a dedicated -5V rail be preferred?
> I see the specs are based on +/-5V supply.

The SSI2130 needs 3 rails:
+5V power
+2.5V reference
-5V to -18V power

Ideally all three should be low noise, especially the VREF.
Personally I would enclose the VCO in its own local voltage regulators
to keep it away from the rubbish on the power lines.

> It'll be good to learn to solder such things for proto!

Adaptor boards, or wait for someone to come out with one already mounted.

> The size & price seem pretty enticing whether or not all the multitude
> nice onboard features are used.

It really is a nice chip ;)

Cheers
Neil