[sdiy] Sample & (infinite) Hold

[Tim Daugard]

> The DS4303 is a nonvolatile (NV) sample and infinite-hold adjustable
> voltage reference. The reference voltage is programmed in-circuit
> during factory calibration/ programming. Programming the reference

I looked at it. IIRC it is a three volt part or at most only a five volt
part. It is designed as a set and ignore calibration part. The diagram
show it being set by using an external source then check the output and
if not correct adjust the source. I lost interest in this part quick.

In my quest for a sample and hold (a module I haven't built yet) I tried
using a 2N7000 as a switch. When the input signal is greater than the
capacitor level it's great. Would work with lower input signals. I sat
down later and looked at the data sheet. You know . . . when you forward
bias a protection diode, it actually conducts! . . . duh, back to the
drawing board.

Tim Daugard
AG4GZ 30.4078N 86.6227W Alt: 3.7 M
http://home.sprintmail.com/~daugard/synth.htm

Waiting for hurricane Dennis