MAX5477ETE#G16中文资料

Dual, 256-Tap, Nonvolatile,

General Description

Features

The MAX5477/MAX5478/MAX5479 nonvolatile, dual, linear-taper, digital potentiometers perform the function Power-On Recall of Wiper Position fromNonvolatile Memoryof a mechanical potentiometer, but replace themechanics with a simple 2-wire digital interface. Each EEPROM Write Protection

device performs the same function as a discrete poten- Tiny 3mm x 3mm x 0.8mm Thin QFN Packagetiometer or variable resistor and has 256 tap points.

70ppm/°C End-to-End Resistance TemperatureThe devices feature an internal, nonvolatile EEPROMCoefficientused to store the wiper position for initialization duringpower-up. A write-protect feature prevents accidental 10ppm/°C Ratiometric Temperature Coefficientoverwrites of the EEPROM. The fast-mode I2C-compati- Fast 400kbps I2C-Compatible Serial Interfaceble serial interface allows communication at data rates 1µA (max) Static Supply Current

up to 400kbps, minimizing board space and reducinginterconnection complexity in many applications. Three Single-Supply Operation: +2.7V to +5.25Vaddress inputs allow a total of eight unique address 256 Tap Positions per Potentiometercombinations.

±0.5 LSB DNL in Voltage-Divider ModeThe MAX5477/MAX5478/MAX5479 provide three nomi-

±1 LSB INL in Voltage-Divider Mode

nal resistance values: 10k (MAX5477), 50k (MAX5478), or 100k (MAX5479). The nominal resistortemperature coefficient is 70ppm/°C end-to-end and10ppm/°C ratiometric. The low temperature coefficientmakes the devices ideal for applications requiring a low-temperature-coefficient variable resistor, such as low-drift, programmable gain-amplifier circuit configurations.The MAX5477/MAX5478/MAX5479 are available in 16-pin 3mm x 3mm x 0.8mm thin QFN and 14-pin 4.4mm x5mm TSSOP packages. These devices operate overthe extended -40°C to +85°C temperature range.

Applications

Mechanical Potentiometer ReplacementLow-Drift Programmable-Gain AmplifiersPurchase of I2C components from Maxim Integrated Products,Volume Control

Inc. or one of its sublicensed Associated Companies, conveysLiquid-Crystal Display (LCD) Contrast Control

a license under the Philips I2C Patent Rights to use these com-ponents in an I22C system, provided that the system conformsto the IC Standard Specification as defined by Philips.

*Future product—contact factory for availability.Pin Configurations appear at end of data sheet.

________________________________________________________________Maxim Integrated Products

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For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at http://www.77cn.com.cn.

MAX5477/MAX5478/MAX5479

Dual, 256-Tap, Nonvolatile, I2C-Interface, Digital PotentiometersMAX5477/MAX5478/MAX5479

ABSOLUTE MAXIMUM RATINGS

SDA, SCL, VDDto GND.........................................-0.3V to +6.0VAll Other Pins to GND.................................-0.3V to (VDD+ 0.3V)Maximum Continuous Current into H_, L_, and W_

MAX5477......................................................................±5.0mAMAX5478......................................................................±1.3mAMAX5479......................................................................±0.6mA

Continuous Power Dissipation (TA= +70°C)

16-Pin Thin QFN (derate 17.5mW/°C above +70°C) 1398mW14-Pin TSSOP (derate 9.1mW/°C above +70°C).........727mWOperating Temperature Range...........................-40°C to +85°CMaximum Junction Temperature.....................................+150°CStorage Temperature Range.............................-65°C to +150°CLead Temperature (soldering, 10s).................................+300°C

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functionaloperation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure toabsolute maximum rating conditions for extended periods may affect device reliability.

ELECTRICAL CHARACTERISTICS

(VDD= +2.7V to +5.25V, H_ = VDD, L_ = GND, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VDD= +5V, TA=+25°C.) (Note 1)

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Dual, 256-Tap, Nonvolatile, I2C-Interface,

Digital Potentiometers

ELECTRICAL CHARACTERISTICS (continued)

(VDD= +2.7V to +5.25V, H_ = VDD, L_ = GND, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VDD= +5V, TA=+25°C.) (Note 1)

TIMING CHARACTERISTICS

MAX5477/MAX5478/MAX5479

Dual, 256-Tap, Nonvolatile, I2C-Interface, Digital PotentiometersMAX5477/MAX5478/MAX5479

TIMING CHARACTERISTICS (continued)

(V= +2.7V to +5.25V, H_ = V, L_ = GND, T= -40°C to +85°C, unless otherwise noted. Typical values are at V= +5V, Note 2:The DNL and INL are measured with the potentiometer configured as a voltage-pider with H_ = VDDand L_ = GND. The

wiper terminal is unloaded and measured with a high-input-impedance voltmeter.

Note 3:The DNL and INL are measured with the potentiometer configured as a variable resistor. H_ is unconnected and L_ =

GND. For VDD= +5V, the wiper is driven with 400µA (MAX5477), 80µA(MAX5478), or 40µA (MAX5479). For VDD= +3V,the wiper is driven with 200µA (MAX5477), 40µA (MAX5478), or 20µA (MAX5479).

Note 4:The wiper resistance is measured using the source currents given in Note 3.

Note 5:The devices draw current in excess of the specified supply current when the digital inputs are driven with voltages betwee …… 此处隐藏：21281字，全部文档内容请下载后查看。喜欢就下载吧 ……