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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX5477 Datasheet

Dual - 256-Tap / Nonvolatile / I2C-Interface / Digital Potentiometers

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19-3379; Rev 5; 11/11
EVAALVUAAILTAIOBNLEKIT
Dual, 256-Tap, Nonvolatile,
I2C-Interface, Digital Potentiometers
General Description
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.
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.
The MAX5477/MAX5478/MAX5479 provide three nomi-
nal resistance values: 10k(MAX5477), 50k
(MAX5478), or 100k(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.
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.
Applications
Mechanical Potentiometer Replacement
Low-Drift Programmable-Gain Amplifiers
Volume Control
Liquid-Crystal Display (LCD) Contrast Control
Features
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
o 10ppm/°C Ratiometric Temperature Coefficient
o Fast 400kbps I2C-Compatible Serial Interface
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
o ±1 LSB INL in Voltage-Divider Mode
Functional Diagram
VDD
8-BIT
GND
SHIFT 8
REGISTER
16-BIT
LATCH
8 256 256
POSITION
DECODER
POR
SDA
I2C
SCL INTERFACE
WP
16-BIT
NV
MEMORY
8
256 256
POSITION
DECODER
A0 MAX5477
A1 MAX5478
A2 MAX5479
Pin Configurations appear at end of data sheet.
HA
WA
LA
HB
WB
LB
PART
TEMP RANGE
MAX5477ETE+T
-40°C to +85°C
MAX5477EUD+
MAX5478ETE+T
-40°C to +85°C
-40°C to +85°C
MAX5478EUD+
MAX5479ETE+T
-40°C to +85°C
-40°C to +85°C
MAX5479EUD+
-40°C to +85°C
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
*EP = Exposed pad.
Ordering Information/Selector Guide
PIN-PACKAGE
16 TQFN-EP*
14 TSSOP
16 TQFN-EP*
14 TSSOP
16 TQFN-EP*
14 TSSOP
END-TO-END
RESISTANCE (k)
10
10
50
50
100
100
TOP MARK
ABO
ABP
ABQ
________________________________________________________________ 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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX5477 Datasheet

Dual - 256-Tap / Nonvolatile / I2C-Interface / Digital Potentiometers

No Preview Available !

Dual, 256-Tap, Nonvolatile, I2C-Interface,
Digital Potentiometers
ABSOLUTE MAXIMUM RATINGS
SDA, SCL, VDD to GND .........................................-0.3V to +6.0V
All Other Pins to GND.................................-0.3V to (VDD + 0.3V)
Maximum Continuous Current into H_, L_, and W_
MAX5477......................................................................±5.0mA
MAX5478......................................................................±1.3mA
MAX5479......................................................................±0.6mA
Continuous Power Dissipation (TA = +70°C)
16-Pin TQFN (derate 17.5mW/°C above +70°C) .......1398mW
14-Pin TSSOP (derate 9.1mW/°C above +70°C) .........727mW
Operating Temperature Range ...........................-40°C to +85°C
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
PACKAGE THERMAL CHARACTERISTICS (Note 1)
TQFN
Junction-to-Ambient Thermal Resistance (θJA) ........57.2°C/W
Junction-to-Case Thermal Resistance (θJC) ................40°C/W
TSSOP
Junction-to-Ambient Thermal Resistance (θJA) ......100.4°C/W
Junction-to-Case Thermal Resistance (θJC) ................30°C/W
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.
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 2)
PARAMETER
SYMBOL
CONDITIONS
DC PERFORMANCE (VOLTAGE-DIVIDER MODE)
Resolution
Integral Nonlinearity
INL (Note 3)
Differential Nonlinearity
DNL (Note 3)
Dual Code Matching
R0 and R1 set to same code (all codes)
MIN
256
TYP
MAX UNITS
±1
±0.5
±1
Taps
LSB
LSB
LSB
End-to-End Resistance
Temperature Coefficient
TCR
70 ppm/°C
Ratiometric Resistance
Temperature Coefficient
10 ppm/°C
MAX5477
Full-Scale Error
MAX5478
MAX5479
MAX5477
Zero-Scale Error
MAX5478
MAX5479
DC PERFORMANCE (VARIABLE-RESISTOR MODE)
Integral Nonlinearity (Note 4)
INL VDD = 3V
VDD = 5V
MAX5477
Differential Nonlinearity (Note 4)
DNL MAX5478
MAX5479
-4
-0.6 LSB
-0.3
4
0.6 LSB
0.3
±3
±1.5
LSB
±1
±1 LSB
±1
2 _______________________________________________________________________________________


Part Number MAX5477
Description Dual - 256-Tap / Nonvolatile / I2C-Interface / Digital Potentiometers
Maker Maxim
Total Page 16 Pages
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