OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

MAX5478EUD+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
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 I
2
C-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: 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.
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 I
2
C-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
MAX5477/MAX5478/MAX5479
Dual, 256-Tap, Nonvolatile,
I
2
C-Interface, Digital Potentiometers
________________________________________________________________
Maxim Integrated Products
1
19-3379; Rev 5; 11/11
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.
Pin Configurations appear at end of data sheet.
EVALUATION KIT
AVAILABLE
Ordering Information/Selector Guide
PART TEMP RANGE PIN-PACKAGE
END-TO-END
RESISTANCE (k)
TOP MARK
MAX5477ETE+T -40°C to +85°C 16 TQFN-EP* 10 ABO
MAX5477EUD+ -40°C to +85°C 14 TSSOP 10 —
MAX5478ETE+T -40°C to +85°C 16 TQFN-EP* 50 ABP
MAX5478EUD+ -40°C to +85°C 14 TSSOP 50 —
MAX5479ETE+T -40°C to +85°C 16 TQFN-EP* 100 ABQ
MAX5479EUD+ -40°C to +85°C 14 TSSOP 100 —
+
Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
*
EP = Exposed pad.
Functional Diagram
MAX5477
MAX5478
MAX5479
8-BIT
SHIFT
REGISTER
POR
16-BIT
LATCH
16-BIT
NV
MEMORY
SDA
SCL
WP
A0
A1
A2
8
256
POSITION
DECODER
8
8
256
256
POSITION
DECODER
256
HA
WA
LA
HB
WB
LB
V
DD
GND
I
2
C
INTERFACE
MAX5477/MAX5478/MAX5479
Dual, 256-Tap, Nonvolatile, I
2
C-Interface,
Digital Potentiometers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
DD
= +2.7V to +5.25V, H_ = V
DD
, L_ = GND, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at V
DD
= +5V,
T
A
= +25°C.) (Note 2)
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.
SDA, SCL, V
DD
to GND.........................................-0.3V to +6.0V
All Other Pins to GND.................................-0.3V to (V
DD
+ 0.3V)
Maximum Continuous Current into H_, L_, and W_
MAX5477......................................................................±5.0mA
MAX5478......................................................................±1.3mA
MAX5479......................................................................±0.6mA
Continuous Power Dissipation (T
A
= +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
PACKAGE THERMAL CHARACTERISTICS (Note 1)
TQFN
Junction-to-Ambient Thermal Resistance (θ
JA
) ........57.2°C/W
Junction-to-Case Thermal Resistance (θ
JC
) ................40°C/W
TSSOP
Junction-to-Ambient Thermal Resistance (θ
JA
) ......100.4°C/W
Junction-to-Case Thermal Resistance (θ
JC
) ................30°C/W
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DC PERFORMANCE (VOLTAGE-DIVIDER MODE)
Resolution 256 Taps
Integral Nonlinearity INL (Note 3) ±1 LSB
Differential Nonlinearity DNL (Note 3) ±0.5 LSB
Dual Code Matching R0 and R1 set to same code (all codes) ±1 LSB
End-to-End Resistance
Temperature Coefficient
TC
R
70 ppm/°C
Ratiometric Resistance
Temperature Coefficient
10 ppm/°C
MAX5477 -4
MAX5478 -0.6
Full-Scale Error
MAX5479 -0.3
LSB
MAX5477 4
MAX5478 0.6
Zero-Scale Error
MAX5479 0.3
LSB
DC PERFORMANCE (VARIABLE-RESISTOR MODE)
V
DD
= 3V ±3
Integral Nonlinearity (Note 4) INL
V
DD
= 5V ±1.5
LSB
MAX5477 ±1
MAX5478 ±1
Differential Nonlinearity (Note 4) DNL
MAX5479 ±1
LSB
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
.
MAX5477/MAX5478/MAX5479
Dual, 256-Tap, Nonvolatile, I
2
C-Interface,
Digital Potentiometers
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +2.7V to +5.25V, H_ = V
DD
, L_ = GND, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at V
DD
= +5V,
T
A
= +25°C.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Dual Code Matching
R0 and R1 set to same code
(all codes), V
DD
= 3V or 5V
±3 LSB
DC PERFORMANCE (RESISTOR CHARACTERISTICS)
Wiper Resistance R
W
(Note 5) 325 675
Wiper Capacitance C
W
10 pF
MAX5477 7.5 10 12.5
MAX5478 37.5 50 62.5
End-to-End Resistance R
HL
MAX5479 75 100 125
k
DIGITAL INPUTS
V
DD
= 3.4V to 5.25V 2.4
Input High Voltage (Note 6) V
IH
V
DD
< 3.4V 0.7 x V
DD
V
Input Low Voltage V
IL
(Note 6) 0.8 V
Output Low Voltage V
OL
I
SINK
= 3mA 0.4 V
WP Pullup Resistance I
WP
255 k
Input Leakage Current I
LEAK
±1 µA
Input Capacitance 5 pF
DYNAMIC CHARACTERISTICS
Crosstalk
HA = 1kHz (0 to V
DD
), LA = GND,
LB = GND, measure WB
-75 dB
MAX5477 400
MAX5478 100
3dB Bandwidth (Note 7)
MAX5479 50
kHz
Total Harmonic Distortion Plus
Noise
THD+N
H_ = 1V
RMS
, f = 1kHz, L_ = GND,
measure W_
0.003 %
NONVOLATILE MEMORY RELIABILITY
Data Retention T
A
= +85°C 50 Years
T
A
= +25°C 200,000
Endurance
T
A
= +85°C 50,000
Stores
POWER SUPPLY
Power-Supply Voltage V
DD
2.70 5.25 V
Writing to EEPROM, digital inputs at
GND or V
DD
, T
A
= +25°C (Note 8)
250 400
WP = GND 15 20.6
Supply Current I
DD
Normal operation,
digital inputs at GND or
V
DD
, T
A
= +25°C
WP = V
DD
0.5 1
µA
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

MAX5478EUD+

Mfr. #:
Buy MAX5478EUD+
Manufacturer:
Maxim Integrated
Description:
Digital Potentiometer ICs Dual 256-Tap NV I2C-Interface
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet