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MAX5477 Datasheet Preview

MAX5477 Datasheet

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

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MAX5477 pdf
19-3379; Rev 2; 12/04
www.DataSheet4U.com
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 35ppm/°C end-to-end and
5ppm/°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 thin QFN and 14-pin 4.4mm x
5mm TSSOP packages. These devices operate over
the extended -40°C to +85°C temperature range.
Features
Power-On Recall of Wiper Position from
Nonvolatile Memory
EEPROM Write Protection
Tiny 3mm x 3mm x 0.8mm Thin QFN Package
35ppm/°C End-to-End Resistance Temperature
Coefficient
5ppm/°C Ratiometric Temperature Coefficient
Fast 400kbps I2C-Compatible Serial Interface
1µA (max) Static Supply Current
Single-Supply Operation: +2.7V to +5.25V
256 Tap Positions per Potentiometer
±0.5 LSB DNL in Voltage-Divider Mode
±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
HA
WA
LA
HB
WB
Applications
Mechanical Potentiometer Replacement
Low-Drift Programmable-Gain Amplifiers
Volume Control
Liquid-Crystal Display (LCD) Contrast Control
A0 MAX5477
A1 MAX5478
A2 MAX5479
LB
Purchase of I2C components from Maxim Integrated
Products, Inc. or one of its sublicensed Associated
Companies, conveys a license under the Philips I2C Patent
Rights to use these components in an I2C system, provided
that the system conforms to the I2C Standard Specification as
defined by Philips.
Ordering Information/Selector Guide
PART
TEMP RANGE
PIN-PACKAGE
MAX5477ETE*
-40°C to +85°C 16 Thin QFN
MAX5477EUD*
-40°C to +85°C 14 TSSOP
MAX5478ETE*
-40°C to +85°C 16 Thin QFN
MAX5478EUD
-40°C to +85°C 14 TSSOP
MAX5479ETE*
-40°C to +85°C 16 Thin QFN
MAX5479EUD
-40°C to +85°C 14 TSSOP
*Future product—contact factory for availability.
END-TO-END
RESISTANCE (k)
10
10
50
50
100
100
TOP
MARK
ABO
ABP
ABQ
PACKAGE CODE
T1633F-3
T1633F-3
T1633F-3
Pin Configurations appear at end of data sheet.
________________________________________________________________ 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
Maxim

MAX5477 Datasheet Preview

MAX5477 Datasheet

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

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MAX5477 pdf
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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 Thin QFN (derate 17.5mW/°C above +70°C) 1399mW
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
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.
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)
PARAMETER
SYMBOL
DC PERFORMANCE (VOLTAGE-DIVIDER MODE)
CONDITIONS
Resolution
Integral Nonlinearity
INL (Note 2)
Differential Nonlinearity
DNL (Note 2)
Dual Code Matching
R0 and R1 set to same code (all codes)
End-to-End Resistance
Temperature Coefficient
TCR
MIN
TYP
256
35
MAX UNITS
±1
±0.5
±1
Taps
LSB
LSB
LSB
ppm/°C
Ratiometric Resistance
Temperature Coefficient
MAX5477
Full-Scale Error
MAX5478
MAX5479
MAX5477
Zero-Scale Error
MAX5478
MAX5479
DC PERFORMANCE (VARIABLE-RESISTOR MODE)
Integral Nonlinearity (Note 3)
INL VDD = 3V
VDD = 5V
VDD = 3V, MAX5477, guaranteed
monotonic
Differential Nonlinearity (Note 3)
DNL
VDD = 3V, MAX5478
VDD = 3V, MAX5479
VDD = 5V
Dual Code Matching
R0 and R1 set to same code
(all codes), VDD = 3V or 5V
DC PERFORMANCE (RESISTOR CHARACTERISTICS)
Wiper Resistance
Wiper Capacitance
RW (Note 4)
CW
MAX5477
End-to-End Resistance
RHL MAX5478
MAX5479
5 ppm/°C
-3
-0.6 LSB
-0.3
3
0.6 LSB
0.3
±3
±1.5
±1
±1
±1
±1
±3
LSB
LSB
LSB
325 675
10 pF
7.5 10 12.5
37.5 50 62.5 k
75 100 125
2 _______________________________________________________________________________________


Part Number MAX5477
Description Dual - 256-Tap/ Nonvolatile/ I2C-Interface/ Digital Potentiometers
Maker Maxim
Total Page 15 Pages
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