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Author Topic: X9C103 digitally controlled potentiometer  (Read 2399 times)
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max
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« on: February 11, 2019, 03:43:16 03:43 »

Hi,

I have xicor X9C103 based potentiometer module, as per data sheet -5v to +5v can be
applied across the potentiometer, is it ok if I can apply 0 to 10v across the pot?

Secondly where I can find the xicor app notes pdf files?

Regards
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Xwing
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« Reply #1 on: February 11, 2019, 04:49:53 04:49 »

the maximum voltage applicable to the potentiometer pins is 5V, although compatible with the +/- 5V range it is not possible to use it with 0-10 V range.
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« Reply #2 on: February 11, 2019, 05:27:15 05:27 »

https://pdf1.alldatasheet.com/datasheet-pdf/view/34254/XICOR/X9C103S.html
you could use an opamp to get 0-10v range.
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Sideshow Bob
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« Reply #3 on: February 11, 2019, 11:12:22 11:12 »

It can be used in a single supply application, as far as I can see from the data sheet. How about use it in a setting with a VH=5 volt and VL=ground. And simply use an opamp after with a gain of two
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h0nk
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« Reply #4 on: February 11, 2019, 03:36:08 15:36 »


> in a setting with a VH=5 volt and VL=ground

Why not use then a DAC instead of digitally controlled potentiometer,
and an opamp as by SideshowBoB suggested?

Real use cases of digitally controlled potentiometer are rather seldom.

I have seen years ago some in the circuitry of a Laser-Receiver for
the Equalizers.


Best Regards
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fpgaguy
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« Reply #5 on: February 12, 2019, 11:51:37 11:51 »

or, you can try this part from analog devices

AD5290YRMZ10-R7CT-ND

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« Reply #6 on: February 16, 2019, 01:13:13 13:13 »

take a look this data book from Xicor.
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PICker
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« Reply #7 on: February 16, 2019, 02:30:47 14:30 »

Hi, I've worked for a long time with Digital potentiometers for designing custom gain instrumentation amplifiers/signal subtractors.
The main issue is the wide range of resistance variation among chips while the laser-trimmered R values inside the single device is amazing.
This make a DIGIPOT useful for creating analog Resistor nets for operational amplifiers with low % differences inside the chip.
Another problem, I rembember, was the difference with real potentiomenters about bipolar signals in relationship with the power supply of the DIGIPOT. Some devices are exclusively for single supply applications while others for dual supply.
Just for having an idea and if you have time, read the following introductive document from Analg Devices:
https://www.analog.com/media/en/news-marketing-collateral/product-selection-guide/Choosing_the_Correct_Digipot.pdf
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Checksum8
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« Reply #8 on: February 16, 2019, 04:04:53 16:04 »

If you can't get the Xicor to work, take a look at the MCP41HVX1. It's specified for up to +36v or +/-18v. Page 24 of the data sheet shows the different digital ground configurations. I bought some samples, but have not had the time to test them out.

http://ww1.microchip.com/downloads/en/DeviceDoc/20005207B.pdf
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« Reply #9 on: March 14, 2019, 05:58:33 17:58 »

I know it may be late, but give a chance to the Microchip MCP41HVx1 digipots. They work flawlessly.
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