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Digital programmable potentiometer devices

A Programmable potentiometer is a component-level controlling device in which the resistance between two externally accessible terminals can be varied as programed by the master/host device.

The Digital potentiometer actually consists of a number of resistive elements connected in a series combination between the two terminals. The taps to these resistive elements are controlled by CMOS switches. These resistive elements are composed of polycrystalline silicon and are insulated from other parts of the circuit through the oxide layer coating. Only one of the CMOS switches is closed at a time leading to a certain resistance between the terminals.

There are special control registers which store the switching instructions for every wiper taps. The number of bits in the control registers depends on the number of resistive elements and the greater the number of resistive elements inside the digital pot, the greater the number of resistance values can be obtained. The CAT5241 programmable digital potentiometer IC, for example, has four independent digital pots on the same chip. Each of these four potentiometers has 63 resistive elements and need a 6-bit control resister to control their tapping.

The control registers can be programmed by a computer through I2C transmission. The wiper settings stored in these control registers are non-volatile, which means that the instructions are not erased from its memory even if the power is turned OFF.

Modes of operation

A programmable potentiometer may be used as a three-terminal device or as a two-terminal device. These applications are briefly explained with the help of the following examples:

As a three-terminal device

The digital pot can be used as a potential divider to get a certain voltage output anywhere between the voltages of the two terminals as the wiper voltage. This can be used to make a simple digital to analog converter which can give continuous varying voltage output by connecting the wiper to the input of an op-amp. The digital signal sent by the host device will be converted to an analog signal at the output of the op-amp. The greater the number of resistive elements in the potentiometer, the greater the resolution can be attained for the output signal.

As a two-terminal device

The digital potentiometer can also be used as a programmable resister in circuits where the circuit parameters depend on a certain resistor. For example, we can use the programmable pot to vary the voltage gain in an op-amp by using it as the feedback element. Or we can vary the cutoff frequency of a high-pass or low-pass filter by using it as the biasing resistance.

Data Acquisition - Digital Potentiometers

Records 7572
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Image Part Number Description Package In Stock Quantity
DS3905U-020+ DS3905U-020+Maxim IntegratedData Acquisition - Digital Potentiometers, IC DGTL POT 20KOHM 128TAP 10UMAX10-TFSOP, 10-MSOP (0.118", 3.00mm Width)In Stock: 101 piece(s)
CAT5241WI-50-T1 CAT5241WI-50-T1ON SemiconductorData Acquisition - Digital Potentiometers, IC POT DIG 50K 64TAP 4CH 20SOIC20-SOIC (0.295", 7.50mm Width)In Stock: 192 piece(s)
CAT5261YI-50-T2 CAT5261YI-50-T2ON SemiconductorData Acquisition - Digital Potentiometers, IC POT DIG 50K 256T SPI 24TSSOP24-TSSOP (0.173", 4.40mm Width)In Stock: 306 piece(s)
CAT5241WI-10-T1 CAT5241WI-10-T1ON SemiconductorData Acquisition - Digital Potentiometers, IC POT DIG 10K 64TAP 4CH 20SOIC20-SOIC (0.295", 7.50mm Width)In Stock: 107 piece(s)
CAT5241WI-25-T1 CAT5241WI-25-T1ON SemiconductorData Acquisition - Digital Potentiometers, IC POT DIG 25K 64TAP 4CH 20SOIC20-SOIC (0.295", 7.50mm Width)In Stock: 117 piece(s)
CAT5241WI-00-T1 CAT5241WI-00-T1ON SemiconductorData Acquisition - Digital Potentiometers, IC POT DIG 100K 64TAP 4CH 20SOIC20-SOIC (0.295", 7.50mm Width)In Stock: 180 piece(s)
CAT5241YI-50-T2 CAT5241YI-50-T2ON SemiconductorData Acquisition - Digital Potentiometers, IC POT DIG 50K 64TAP 4CH 20TSSOP20-TSSOP (0.173", 4.40mm Width)In Stock: 353 piece(s)
CAT5241YI-10-T2 CAT5241YI-10-T2ON SemiconductorData Acquisition - Digital Potentiometers, IC POT DIG 10K 64TAP 4CH 20TSSOP20-TSSOP (0.173", 4.40mm Width)In Stock: 293 piece(s)
CAT5241YI-00-T2 CAT5241YI-00-T2ON SemiconductorData Acquisition - Digital Potentiometers, IC POT DIG 100K 64TP 4CH 20TSSOP20-TSSOP (0.173", 4.40mm Width)In Stock: 428 piece(s)
CAT5241YI-25-T2 CAT5241YI-25-T2ON SemiconductorData Acquisition - Digital Potentiometers, IC POT DIG 25K 64TAP 4CH 20TSSOP20-TSSOP (0.173", 4.40mm Width)In Stock: 424 piece(s)
CAT5113ZI-00-T3 CAT5113ZI-00-T3ON SemiconductorData Acquisition - Digital Potentiometers, IC POT DPP NV 100TAP U/D 8MSOP8-TSSOP, 8-MSOP (0.118", 3.00mm Width)In Stock: 319 piece(s)
CAT5115ZI-50-GT3 CAT5115ZI-50-GT3ON SemiconductorData Acquisition - Digital Potentiometers, IC POT DIG 50K 32TAP 8MSOP8-TSSOP, 8-MSOP (0.118", 3.00mm Width)In Stock: 142 piece(s)
CAT5115ZI-00-GT3 CAT5115ZI-00-GT3ON SemiconductorData Acquisition - Digital Potentiometers, IC POT DIG 100K 32TAP 8MSOP8-TSSOP, 8-MSOP (0.118", 3.00mm Width)In Stock: 425 piece(s)
CAT5121TBI-10GT3 CAT5121TBI-10GT3ON SemiconductorData Acquisition - Digital Potentiometers, IC POT DIGITL 10K 16TAP SOT23-6SOT-23-6In Stock: 483 piece(s)
CAT5120TBI-10GT3 CAT5120TBI-10GT3ON SemiconductorData Acquisition - Digital Potentiometers, IC POT DIGITL 10K 16TAP SOT23-6SOT-23-6In Stock: 364 piece(s)
CAT5115YI-50-GT3 CAT5115YI-50-GT3ON SemiconductorData Acquisition - Digital Potentiometers, IC POT DIG 50K 32TAP 8TSSOP8-TSSOP (0.173", 4.40mm Width)In Stock: 410 piece(s)
CAT5115YI-10-GT3 CAT5115YI-10-GT3ON SemiconductorData Acquisition - Digital Potentiometers, IC POT DIG 10K 32TAP 8TSSOP8-TSSOP (0.173", 4.40mm Width)In Stock: 217 piece(s)
CAT5115YI-00-GT3 CAT5115YI-00-GT3ON SemiconductorData Acquisition - Digital Potentiometers, IC POT DIG 100K 32TAP 8TSSOP8-TSSOP (0.173", 4.40mm Width)In Stock: 377 piece(s)
CAT5115VI-50-GT3 CAT5115VI-50-GT3ON SemiconductorData Acquisition - Digital Potentiometers, IC POT DIG 50K 32TAP 8SOIC8-SOIC (0.154", 3.90mm Width)In Stock: 330 piece(s)
CAT5115VI-10-GT3 CAT5115VI-10-GT3ON SemiconductorData Acquisition - Digital Potentiometers, IC POT DIG 10K 32TAP 8SOIC8-SOIC (0.154", 3.90mm Width)In Stock: 313 piece(s)
CAT5115VI-00-GT3 CAT5115VI-00-GT3ON SemiconductorData Acquisition - Digital Potentiometers, IC POT DIG 100K 32TAP 8SOIC8-SOIC (0.154", 3.90mm Width)In Stock: 490 piece(s)
CAT5110SDI-50GT3 CAT5110SDI-50GT3ON SemiconductorData Acquisition - Digital Potentiometers, IC POT DGTL 32TAP 2WIRE SC70-66-TSSOP, SC-88, SOT-363In Stock: 490 piece(s)
CAT5115ZI-10-GT3 CAT5115ZI-10-GT3ON SemiconductorData Acquisition - Digital Potentiometers, IC POT DIG 10K 32TAP 8MSOP8-TSSOP, 8-MSOP (0.118", 3.00mm Width)In Stock: 465 piece(s)
X9408WW X9408WWRenesas Electronics AmericaData Acquisition - Digital Potentiometers, IC XDCP QUAD-In Stock: 284 piece(s)
X9400WS24IZT1S2705 X9400WS24IZT1S2705Renesas Electronics AmericaData Acquisition - Digital Potentiometers, IC XDCP QUAD 64-TAP 24-TSSOP-In Stock: 300 piece(s)
DS1805Z-010+T&R DS1805Z-010+T&RMaxim IntegratedData Acquisition - Digital Potentiometers, IC DGTL POT 10K 16SOIC-In Stock: 181 piece(s)
MAX5474EKA MAX5474EKAMaxim IntegratedData Acquisition - Digital Potentiometers, IC DGTL POT 50KOHM 32TAP SOT23-8SOT-23-8In Stock: 187 piece(s)
MAX5407EKA MAX5407EKAMaxim IntegratedData Acquisition - Digital Potentiometers, IC DGTL POT 20KOHM 32TAP SOT23-8SOT-23-8In Stock: 418 piece(s)
CAT5123TBI-10GT3 CAT5123TBI-10GT3ON SemiconductorData Acquisition - Digital Potentiometers, IC DGTL POT 10KOHM 32TAP SOT23-5SC-74A, SOT-753In Stock: 334 piece(s)
CAT5124TBI-50GT3 CAT5124TBI-50GT3ON SemiconductorData Acquisition - Digital Potentiometers, IC DGTL POT 50KOHM 32TAP SOT23-5SC-74A, SOT-753In Stock: 218 piece(s)