Datasheet questions

Question

Hello , 
 Thank you for all the excellent products and support. 
 I am sorry for my ignorance in electronics, I am a computer scientist. I am working on a circuit for electric guitars. I have been building prototypes based on the DS1882 digipot. I now realize that it's not adequate for my purpose and would like to try to use the AD5235. I have 2 questions: 
 1. Is the AD5235 compatible with 3.3v digital logic.(SPI)? 
 2. Can the AD5235 accept +/-7v as analog supplies? 
 
 I realize that this information may be available in the datasheet, but I haven't been able to understand it well enough to find it. 
 
 Thank you for your help and understanding.

Achim · Accepted Answer

Hello, 
 gratefulfrog said: 1. Is the AD5235 compatible with 3.3v digital logic.(SPI)? 
 The allowed input levels depend on the used supply voltage. The datasheet specifies up to Vdd=5V, and there the thresholds are 2,4V for high level and 0,8V for low level. If you drive the inputs by some 3,3V CMOS output, you should be able to reach these levels. 
 The digital output is a so called open drain output. I.e. you can define the output level by yourself, by wiring the required pullup resistor to the according supply. So if you wire the pullup to the 3,3V net, it should work (at least for not too high SPI frequencies). 
 
 gratefulfrog said: 2. Can the AD5235 accept +/-7v as analog supplies? 
 No, unfortunatelly it can't. That's far beyond its absolute maximum ratings, more than 7V between Vdd and Vss may destroy the chip ... 
 
 best regards 
 Achim)

Popular Forums

Product Forums

Application Forums

Design Center Forums

Highlighted Webinar

Places

Libraries

Challenge Yourself!

What's Brewing

Places

Resources

Visit ContentZone

The Latest Read

New Release

Recent Technical Insights

Products Mentioned

Thread Details

Datasheet questions