FAQs/RAQs (81)
- I'm trying to use a potentiometer (pot) in the feedback loop of an op amp circuit, but the adjustment is too sensitive. Do you have any suggestions on how to improve the performance of this circuit?
- Is there a power up sequence I should follow?
- For dual supply digital potentiometers, if VDD/VSS are +2.5V/-2.5V respectively, can digital inputs be fed from a standard 3.3V CMOS logic component without logic level translation? What are the logic level thresholds when VDD is +2.5V and VSS is -2.5V?
- Is there a dependency between the logic level and power consumption?
- Is digital potentiometer a real replacement for mechanical potentiometer or are there restrictions regarding voltage potentials?
- Are all digital potentiometers limited to |5V|?
- Do digital potentiometers handle bipolar and AC operations?
- Can I achieve a 15V signal swing when using a 5V digital potentiometer?
- For digital potentiometers that do not have nonvolatile memory, what is the state during power up?
- Is there a particularly low-power digital potentiometer?
- Does the memory allow the device to return to the last stored value without an update from a micro?
- Will the data in the EEMEM need to be refreshed after 15 yrs when it is operated at 55°C?
- How many write cycles can the EEMEM go through before it fails?
- After the specified EEMEM data retention timeout period, can the power be turned off and back on so that the part is considered "refreshed"?
- Why are some digital potentiometers' maximum operating temperature only 85°C instead of the standard 125°C?
- How good is the resistance matching between Ch1 and Ch2 in the dual digital potentiometer?
- How is the resistance matching device to device?
- What is the resistance tolerance of the digital potentiometers?
- Can I cascade, serialize, or parallel multiple digital potentiometers to get the resistance or resolution I need? My requirement is for a 250 Ω digital potentiometer with approximately 1 Ω/step. I plan to use four 1 kΩ AD8403 in parallel with each set to nominally the same value.
- I would like to know how the digital potentiometer is built. How ideal are the wiper switches?
- What is the tempco of the digital potentiometer?
- What is the maximum current I can force into the digital potentiometer?
- Can a digitally controlled variable resistor withstand greater than 20mA?
- Can a digipot be used to construct a programmable high current source?
- If I use the digital potentiometer in a "dry" circuit (current through wiper < 1 pA), will it behave as a linear resistor in rheostat mode?
- Are ADI's digital potentiometers suitable for use in photodetector amplifiers and will they suffer from leakage currents which could affect the gain of the circuit?
- Regarding the spec on R-DNL, I am only concerned with relative adjustments. I'm not concerned with the actual value of the resistor in the digipot but need the digipot to be monotonic.
- Can I adjust the digital potentiometer for frequencies around 1MHz to 10MHz for adjusting the gain of a video signal?
- What is the maximum frequency that can be applied to the digital potentiometer CLK input?
- Is there crosstalk between Ch1 and Ch2 of a dual digital potentiometer such that a sine wave applied to Ch1 will occur in Ch2 as well?
- If I program Ch 1 from zero to full scale, will I expect Ch 2 to be disturbed?
- Digital Feedthrough
- How is the THD performance of digital potentiometer?
- If I use the digital potentiometer in audio volume control, will I experience zipper noise?
- For a digital potentiometer that requires 6-bit word length, what happens if I have 8-bit word length from my PC?
- For a digital potentiometer that requires 12-bit word length, how can I control with only 8-bit word length from my micro?
- Do you provide any software to control the digital potentiometers?
- How do I daisy-chain multiple potentiometers? How does the serial interface work for multiple AD8403's when there are still only two address bits? Are there multiple /CS lines, one for each individual chip?
- Can I program two channels of a multi-channel digital potentiometer at the same time?
- Can I read back the wiper setting of the digital potentiometers?
- Can I read back the contents of the two RDAC registers of AD5242 or AD5282 (dual I2C compatible digital potentiometer)?
- Is there a digital potentiometer controlled by a parallel input?
- Can digital potentiometers do log taper adjustment?
- I'm unsure about how to use pin 13 write protect (/WP), pin 14 preset (/PR), and pin 16 ready (RDY)?
- Why Should I replace mechanical potentiometers with digiPOT?
- What should I watch out for when I replace mechanical potentiometers with digital potentiometers?
- What is the ESD rating of digital potentiometers?
- How do I tell the end-to-end RAB resistance value?
- What are the common failure modes of digital potentiometers?
- Are there any evaluation boards for the digital potentiometers?
- Are PB-free digital potentiometers available?
- Can I use the new PB-free DigiPOTs in my traditional solder based PCB assembly process?
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