The CAT5128 is a single digitally programmable potentiometer (DPP™) designed as an electronic replacement for mechanical potentiometers and trim pots. Ideal for automated adjustments on high volume production lines, they are also well suited for applications where equipment requiring periodic adjustment is either difficult to access or located in a hazardous or remote environment.
The CAT5128 contains a 32-tap series resistor array connected between two terminals A and B. An up/down counter and decoder that are controlled by two input pins, determines which tap is connected to the wiper, W. Wiper-control of the CAT5128 is accomplished with two input control pins, U¯¯P and ¯D¯O¯W¯¯N¯. A high-to-low transition on the U¯¯P input increments the wiper position and a high-to-low transition on the ¯D¯O¯W¯¯N¯ input decrements the wiper position. The tap position is not stored in memory. The wiper is always set to the mid point, tap 15 at power up.
The digitally programmable potentiometer can be used as a three-terminal resistive divider or as a two-terminal variable resistor. DPPs bring variability and programmability to a wide variety of applications including control, parameter adjustments, and signal processing.

*32-position linear taper potentiometer
*Low power CMOS technology
*Single supply operation: 2.5V – 5.5V
*Discrete step-up/step-down digital control
*Resistance values: 10kΩ, 50kΩ and 100kΩ
*Available in SOT-23 8-lead Pb-free package

*Automated product calibration
*Remote control adjustments
*Offset, gain and zero control
*Tamper-proof calibrations
*Contrast, brightness and volume controls
*Motor controls and feedback systems
*Programmable analog functions

CAT5128TBI-10, CAT5128TBI-50, CAT5128TBI-00

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The DS1844 Quad Digital Potentiometer is a four-channel, digitally controlled linear potentiometer.
Each potentiometer is comprised of 63 equi-resistive sections and has three terminals accessible to the user.
These include the high side terminals, HX, the wiper terminals, WX, and the low-side terminals, LX.
The wiper position on the resistor ladder is selected via an 8-bit register value.
Communication and control of the device are supported by two types of serial interface.
These include a 5-wire I/O shift register interface and a 2-wire addressable interface.
The DS1844 is available in standard 10 k, 50 k, and 100 k versions.
Mixed resistor combinations are also available through custom setups.
The DS1844 is specified to operate over the industrial temperature range: -40C to +85C.
Packages for the DS1844 include 20-pin DIPs, SOICs, and TSSOPs.

* Four independent, digitally controlled 64-position potentiometers
* Two interface control options
- 5-wire serial
- 2-wire addressable
* Standard resistance values
- DS1844-010 10 k
- DS1844-050 50 k
- DS1844-100 100 k
* Mixed resistor value combinations (contact factory for availability)
* Operating Temperature Range
- Industrial: -40°C to +85°C

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General Description
The MAX5494–MAX5499 10-bit (1024-tap), dual, nonvolatile, linear-taper, programmable voltage-dividers and variable resistors perform the function of a mechanical potentiometer, but replace the mechanics with a 3-wire SPI™-compatible serial interface. The MAX5494/MAX5495 are dual, 3-terminal, programmable voltage-dividers; the MAX5496/MAX5497 are dual, 2-terminal variable resistors; and the MAX5498/ MAX5499 include one 2-terminal variable resistor and
one 3-terminal programmable voltage-divider.
The MAX5494–MAX5499 feature an internal, nonvolatile, electrically erasable programmable read-only memory (EEPROM) that stores the wiper position for initialization during power-up. The 3-wire SPI-compatible serial interface allows communication at data rates up to 7MHz.
The MAX5494–MAX5499 are ideal for applications requiring digitally controlled potentiometers. End-to-end resistance values of 10kΩ and 50kΩ are available with a 35ppm/°C end-to-end temperature coefficient. The ratiometric temperature coefficient is 5ppm/°C for each channel,
making these devices ideal for applications requiring low-temperature-coefficient programmable voltagedividers such as low-drift, programmable-gain amplifiers.
The MAX5494–MAX5499 operate with either a single power supply (+2.7V to +5.25V) or dual power supplies (±2.5V). The devices consume 400μA (max) of supply current when writing data to the nonvolatile memory and 1.5μA (max) of standby supply current. The devices are available in space-saving (5mm x 5mm x 0.8mm), 16-pin TQFN package and are specified over
the extended (-40°C to +85°C) temperature range.

Gain and Offset Adjustment
LCD Contrast Adjustment
Pressure Sensors
Low-Drift Programmable-Gain Amplifiers
Mechanical Potentiometer Replacement
Volume Control

* Wiper Position Stored in Nonvolatile Memory and Recalled Upon Power-Up
* 16-Pin, 5mm x 5mm x 0.8mm TQFN Package
* 35ppm/°C End-to-End Resistance Temperature Coefficient
* 5ppm/°C Ratiometric Temperature Coefficient
* 10kΩ and 50kΩ End-to-End Resistor Values
* 3-Wire SPI-Compatible Serial Interface
* Reliability (TA = +85°C) 50,000 Wiper Store Cycles 50 Years Wiper Data Retention
* 1.5μA (max) Standby Current
* Single +2.7V to +5.25V Supply Operation
* Dual ±2.5V Supply Operation


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