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MAX5479

更新时间： 2024-09-17 14:57:19
品牌 Logo 应用领域
亚德诺 - ADI 电位器
页数 文件大小 规格书
16页 313K
描述
双路、256抽头、非易失、I2C接口、数字电位器

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MAX5479 数据手册

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19-3379; Rev 5; 11/11  
Dual, 256-Tap, Nonvolatile,  
I2C-Interface, Digital Potentiometers  
8/MAX5479  
General Description  
Features  
The MAX5477/MAX5478/MAX5479 nonvolatile, dual,  
linear-taper, digital potentiometers perform the function  
of a mechanical potentiometer, but replace the  
mechanics with a simple 2-wire digital interface. Each  
device performs the same function as a discrete poten-  
tiometer or variable resistor and has 256 tap points.  
o Power-On Recall of Wiper Position from  
Nonvolatile Memory  
o EEPROM Write Protection  
o Tiny 3mm x 3mm x 0.8mm Thin QFN Package  
o 70ppm/°C End-to-End Resistance Temperature  
Coefficient  
The devices feature an internal, nonvolatile EEPROM  
used to store the wiper position for initialization during  
power-up. A write-protect feature prevents accidental  
overwrites of the EEPROM. The fast-mode I2C-compati-  
ble serial interface allows communication at data rates  
up to 400kbps, minimizing board space and reducing  
interconnection complexity in many applications. Three  
address inputs allow a total of eight unique address  
combinations.  
o 10ppm/°C Ratiometric Temperature Coefficient  
o Fast 400kbps I C-Compatible Serial Interface  
2
o 1µA (max) Static Supply Current  
o Single-Supply Operation: +2.7V to +5.25V  
o 256 Tap Positions per Potentiometer  
o
0.5 LSB DNL in Voltage-Divider Mode  
1 LSB INL in Voltage-Divider Mode  
o
The MAX5477/MAX5478/MAX5479 provide three nomi-  
nal resistance values: 10kΩ (MAX5477), 50kΩ  
(MAX5478), or 100kΩ (MAX5479). The nominal resistor  
temperature coefficient is 70ppm/°C end-to-end and  
10ppm/°C ratiometric. The low temperature coefficient  
makes the devices ideal for applications requiring a low-  
temperature-coefficient variable resistor, such as low-  
drift, programmable gain-amplifier circuit configurations.  
Functional Diagram  
HA  
V
DD  
8-BIT  
SHIFT  
REGISTER  
256  
POSITION  
DECODER  
8
8
8
256  
256  
16-BIT  
LATCH  
GND  
WA  
The MAX5477/MAX5478/MAX5479 are available in 16-  
pin 3mm x 3mm x 0.8mm TQFN and 14-pin 4.4mm x  
5mm TSSOP packages. These devices operate over  
the extended -40°C to +85°C temperature range.  
POR  
LA  
16-BIT  
NV  
MEMORY  
SDA  
SCL  
WP  
HB  
I2C  
INTERFACE  
256  
POSITION  
DECODER  
WB  
LB  
Applications  
Mechanical Potentiometer Replacement  
Low-Drift Programmable-Gain Amplifiers  
Volume Control  
MAX5477  
MAX5478  
MAX5479  
A0  
A1  
A2  
Pin Configurations appear at end of data sheet.  
Liquid-Crystal Display (LCD) Contrast Control  
Ordering Information/Selector Guide  
END-TO-END  
RESISTANCE (kꢀ)  
PART  
TEMP RANGE  
PIN-PACKAGE  
TOP MARK  
MAX5477ETE+T  
MAX5477EUD+  
MAX5478ETE+T  
MAX5478EUD+  
MAX5479ETE+T  
MAX5479EUD+  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
16 TQFN-EP*  
14 TSSOP  
10  
10  
ABO  
—
16 TQFN-EP*  
14 TSSOP  
50  
ABP  
—
50  
16 TQFN-EP*  
14 TSSOP  
100  
100  
ABQ  
—
+Denotes a lead(Pb)-free/RoHS-compliant package.  
T = Tape and reel.  
*EP = Exposed pad.  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at  
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.  
1234567...16

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