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MAX5477-MAX5479 Datasheet(PDF) 1 Page - Maxim Integrated Products

Part No. MAX5477-MAX5479
Description  Dual, 256-Tap, Nonvolatile, I2C-Interface, Digital Potentiometers
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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MAX5477-MAX5479 Datasheet(HTML) 1 Page - Maxim Integrated Products

 
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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
Ω (MAX5477), 50kΩ
(MAX5478), or 100k
Ω (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.
Applications
Mechanical Potentiometer Replacement
Low-Drift Programmable-Gain Amplifiers
Volume Control
Liquid-Crystal Display (LCD) Contrast Control
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
Dual, 256-Tap, Nonvolatile, I2C-Interface,
Digital Potentiometers
________________________________________________________________ Maxim Integrated Products
1
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
VDD
GND
I
2C
INTERFACE
Ordering Information/Selector Guide
Functional Diagram
19-3379; Rev 2; 12/04
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.
†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.
PART
TEMP RANGE
PIN-PACKAGE
END-TO-END
RESISTANCE (k
Ω)
TOP
MARK
PACKAGE CODE
MAX5477ETE*
-40°C to +85°C
16 Thin QFN
10
ABO
T1633F-3
MAX5477EUD*
-40°C to +85°C
14 TSSOP
10
MAX5478ETE*
-40°C to +85°C
16 Thin QFN
50
ABP
T1633F-3
MAX5478EUD
-40°C to +85°C
14 TSSOP
50
MAX5479ETE*
-40°C to +85°C
16 Thin QFN
100
ABQ
T1633F-3
MAX5479EUD
-40°C to +85°C
14 TSSOP
100
*Future product—contact factory for availability.


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