Digital Potentiometers - Maxim Integrated Products
Description
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19-3371; Rev 0; 7/04
256-Tap, Nonvolatile, SPI-Interface, Digital Potentiometers
General Description
The MAX5422/MAX5423/MAX5424 nonvolatile, lineartaper, digital potentiometers perform the function of a mechanical potentiometer, but replace the mechanics with a simple 3-wire SPI™-compatible digital interface.
Each device performs the same function as a discrete potentiometer or variable resistor and has 256 tap points.
The devices feature an internal, nonvolatile EEPROM used to store the wiper position for initialization during power-up.
The 3-wire SPI-compatible serial interface allows communication at data rates up to 5MHz, minimizing board space and reducing interconnection complexity in many applications.
The MAX5422/MAX5423/MAX5424 provide three nominal resistance values: 50k Ω (MAX5422), 100k Ω (MAX5423), or 200kΩ (MAX5424).
The nominal resistor temperature coefficient is 35ppm/°C end-to-end and only 5ppm/°C ratiometric.
This makes the devices ideal for applications requiring a low-temperature-coefficient variable resistor, such as low-drift, programmable gainamplifier circuit configurations.
The MAX5422/MAX5423/MAX5424 are available in a 3mm x 3mm 8-pin TDFN package, and are specified over the extended -40°C to +85°C temperature range.
Features
o Wiper Position Stored in Nonvolatile Memory (EEPROM) and Recalled Upon Power-Up or Interface Command o 3mm x 3mm x 0.
8mm TDFN Package o 35ppm/°C End-to-End Resistance Temperature Coefficient o 5ppm/°C Ratiometric Temperature Coefficient o 50kΩ, 100kΩ, and 200kΩ Resistor Values o 5MHz SPI-Compatible Serial Interface o 500nA (typ) Static Supply Current o Single-Supply Operation: +2.
7V to +5.
25V o 256 Tap Positions o ±0.
5 LSB DNL in Voltage-Divider Mode o ±0.
5 LSB INL in Voltage-Divider Mode
SPI is a trademark of Motorola, Inc.
MAX5422/MAX5423/MAX5424
Applications
Mechanical Potentiometer Replacement Low-Drift Programmable Gain Amplifiers Audio Volume Control Liquid-Crystal Display (LCD) Contra...
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