[sdiy] AS3280 test

Tim Parkhurst tim.parkhurst at gmail.com
Sun Nov 11 05:33:23 CET 2018

We are truly spoiled for choice these days. Who would have figured we would
see the relatively inexpensive reissue of the 3080, various and sundry CEM
and SSM chips, AND now the 3280? Along with the 13700 and 2164 chips that
have never really gone away, the analog designer's toolbox is full of
wonderful options these days.

Question: Does the improved linearity of the 3280 mean that it will perform
better in VCO applications than the 3080 and 13700?

Thanks for the update, Ian. :)

Tim (I'm not spoiled, I just smell that way) Servo

On Sat, Nov 10, 2018 at 2:21 PM Ian Fritz <ijfritz at comcast.net> wrote:

> Hello --
> Good news! Alex sent me a couple of his AS3280 chips, and they work great!
> I didn't do extensive testing, just a couple of measurements in my usual
> test configuration, which is a standard VCA circuit. I benchmarked them
> against a CA3280 that had previously been selected for high performance,
> and against typical results for older devices.
> Configuration: The input diode pins are fed a 1 mA current. The input to
> the control pin is 0 - 0.5 mA, and the output current is the same. The
> I-V converter output is 0 - 2V.
> With the offset nulled at full gain, the variation in output voltage
> with Iabc is under 1 mV. My standard for a very good device is under 2 mV.
> Output linearity vs Iabc was better than 1%, with two devices near 0.1%
> Devices I tested previously were mostly around 2%. So it shouldn't be
> too hard to select devices for critical multiplier applications.
> Thank you Alex!
> Ian
> --
> ijfritz.byethost4.com
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