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MAX5422

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256-Tap, Nonvolatile, SPI-Interface, Digital Potentiometers

Printable Data Sheet

Product Details

See parametric specs for Digital Potentiometers

Key Features

See parametric specs for Digital Potentiometers

Parametric specs for Digital Potentiometers

Steps	256
# Potentiometers	1
Control Interface	3-Wire Serial SPI
Taper	Linear
Wiper Memory	Non-Volatile
R_END-TO-END (kΩ)	50
Res. Tol. (%)	25
Temp. Coeff. (ppm/°C) (typ)	50
Wiper Resistance (Ω) (typ)	325
I_CC @5V (µA) (max)	1
Package/Pins	TDFN/8
Budgetary Price (See Notes)	1.69

See parametric specs for Digital Potentiometers

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Simplified Block Diagram

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Exact equivalent in functionality and parametrics to the compared device:

Part No.	Description
MAX5478	Dual, 256-Tap, Nonvolatile, I²C-Interface, Digital Potentiometers
MAX5479	Dual, 256-Tap, Nonvolatile, I²C-Interface, Digital Potentiometers
MAX5477	Dual, 256-Tap, Nonvolatile, I²C-Interface, Digital Potentiometers
MAX5417	256-Tap, Nonvolatile, I²C-Interface, Digital Potentiometers
MAX5418	256-Tap, Nonvolatile, I²C-Interface, Digital Potentiometers
MAX5419	256-Tap, Nonvolatile, I²C-Interface, Digital Potentiometers

Technical Docs

Data Sheet

256-Tap, Nonvolatile, SPI-Interface, Digital Potentiometers

Aug 09, 2004

Design & Development

Click any title below to view the detail page where available.

Hardware Development

Evaluation Board

MAX5422EVKIT

$111.30

Description/Applications

The MAX5422 evaluation kit (EV kit) is an assembled and tested PCB that evaluates the MAX5422 IC. The MAX5422 is a 50kΩ 256-tap, nonvolatile, linear digital potentiometer communicating over SPI. The MAX5422 features an internal nonvolatile EEPROM used to store the potentiometer's wiper position for initialization during power-up. The EEPROM is programmed through the SPI-compatible serial interface, communicating at data rates up to 5MHz. The SPI signals can be transmitted through an on-board USB interface circuit using a computer or a user-supplied SPI bus along with PCB headers on the EV kit.

The EV kit also features Windows 2000/XP/Vista®-compatible software that provides a professional user interface for exercising the MAX5422's features. The program is menu driven and offers a graphical user interface (GUI) complete with buttons, track bars, and spin boxes.

The MAX5422 IC is powered from a 3.3V source generated from the EV kit's USB interface circuit, or an external user-supplied 2.7V to 5.25V DC power supply. The MAX5422 section can be broken out from the EV kit, allowing the MAX5422 to be attached to the user applications with minimal additional circuit area.

The EV kit can also evaluate the MAX5423 (100kΩ) or MAX5424 (200kΩ) after IC replacement (U1). The MAX5422 EV kit is shipped with a MAX5422ETA+ IC installed.

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Features

Power-On Recall of Wiper Position from Nonvolatile Memory
2.7V to 5.25V Single-Supply Operation
On-Board USB Interface Circuit for SPI-Compatible Signals
Proven USB-PC Connection for Power and Control (USB Cable Included)
Main Circuit Breakout Board
PCB Headers for User-Supplied SPI-Compatible Signals
PCB Pads for Potentiometer Signals L, W, and H
Evaluates the MAX5422ETA/MAX5423ETA/MAX5424ETA in 3mm x 3mm x 0.8mm, 8-Pin TDFN Package
Windows 2000/XP/Vista (32-Bit)-Compatible Software
Fully Assembled and Tested

Evaluation Board

MAX5422EVKIT

Data Sheet

$111.30

Description/Applications

View Details

Features

Power-On Recall of Wiper Position from Nonvolatile Memory
2.7V to 5.25V Single-Supply Operation
On-Board USB Interface Circuit for SPI-Compatible Signals
Proven USB-PC Connection for Power and Control (USB Cable Included)
Main Circuit Breakout Board
PCB Headers for User-Supplied SPI-Compatible Signals
PCB Pads for Potentiometer Signals L, W, and H
Evaluates the MAX5422ETA/MAX5423ETA/MAX5424ETA in 3mm x 3mm x 0.8mm, 8-Pin TDFN Package
Windows 2000/XP/Vista (32-Bit)-Compatible Software
Fully Assembled and Tested

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Parameters

Parametric specs for Digital Potentiometers

Steps	256
# Potentiometers	1
Control Interface	3-Wire Serial SPI
Taper	Linear
Wiper Memory	Non-Volatile
R_END-TO-END (kΩ)	50
Res. Tol. (%)	25
Temp. Coeff. (ppm/°C) (typ)	50
Wiper Resistance (Ω) (typ)	325
I_CC @5V (µA) (max)	1
Package/Pins	TDFN/8
Budgetary Price (See Notes)	1.69

See parametric specs for Digital Potentiometers

Key Features

Wiper Position Stored in Nonvolatile Memory (EEPROM) and Recalled Upon Power-Up or Interface Command
3mm x 3mm x 0.8mm TDFN Package
35ppm/°C End-to-End Resistance Temperature Coefficient
5ppm/°C Ratiometric Temperature Coefficient
50kΩ, 100kΩ, and 200kΩ Resistor Values
5MHz SPI-Compatible Serial Interface
500nA (typ) Static Supply Current
Single-Supply Operation: +2.7V to +5.25V
256 Tap Positions
±0.5 LSB DNL in Voltage-Divider Mode
±0.5 LSB INL in Voltage-Divider Mode

Applications/Uses

Audio Volume Control
Liquid-Crystal Display (LCD) Contrast Control
Low-Drift Programmable Filters
Low-Drift Programmable-Gain Amplifiers
Mechanical Potentiometer Replacements

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: 50kΩ (MAX5422), 100kΩ (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.

Simplified Block Diagram

MAX5422, MAX5423, MAX5424: Functional Diagram

Technical Docs

Data Sheet

256-Tap, Nonvolatile, SPI-Interface, Digital Potentiometers

Aug 09, 2004

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

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INTERACTIVE Data Sheet

MAX5422

256-Tap, Nonvolatile, SPI-Interface, Digital Potentiometers

Product Details

Key Features

Applications/Uses

Simplified Block Diagram

Similar products you might be interested in

Technical Docs

Design & Development

Support & Training

Parameters

Key Features

Applications/Uses

Description

Simplified Block Diagram

Technical Docs

Support & Training

MAX5422 Related Videos