[sdiy] AS3280 test

Oren Leavitt obl64 at ix.netcom.com
Sun Nov 11 04:31:11 CET 2018


Very nice - Thanks Ian. It is nice to see a favorite OTA come back.

- Oren

On 11/10/18 4:17 PM, Ian Fritz 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
>
>
>
>




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