should the LTC1043 voltage divider circuit be buffered?

[SArepairman]

How should I look at the LTC1043 voltage divider circuits (divide by 2, etc) as a voltage source? what kind if impedance can it support?



how is this analysis done?

I figured something like 600 Hz oscillator frequency, 1uF charge on capacitor, 10k drain, so essentially the capacitor is losing X charge per second and it is restoring itself to full every 1/600th of a second? So its just a RC ripple that changes depending on load?

[T3sl4co1l]

The output impedance is roughly Rds(ON) * 2 + Xc.

Tim

[Andreas]

Hello,

If you want to use it as precision device you should never load the output.
Even the input bias current of a standard buffer amplifier creates a large error.
Usually a LTC1050 buffer (10pA bias current) is used together with the LTC1043.

With best regards

Andreas