Document
19-3708; Rev 3; 4/07
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10-Bit, Nonvolatile, Linear-Taper Digital Potentiometers
General Description
The MAX5481–MAX5484 10-bit (1024-tap) nonvolatile, linear-taper, programmable voltage-dividers and variable resistors perform the function of a mechanical potentiometer, but replace the mechanics with a pinconfigurable 3-wire serial SPI™-compatible interface or up/down digital interface. The MAX5481/MAX5482 are 3-terminal voltage-dividers and the MAX5483/MAX5484 are 2-terminal variable resistors. The MAX5481–MAX5484 feature an internal, nonvolatile, electrically erasable programmable read-only memory (EEPROM) that stores the wiper position for initialization during power-up. The 3-wire SPI-compatible serial interface allows communication at data rates up to 7MHz. A pin-selectable up/down digital interface is also available. The MAX5481–MAX5484 are ideal for applications requiring digitally controlled potentiometers. Two end-toend resistance values are available (10kΩ and 50kΩ) in a voltage-divider or a variable-resistor configuration (see the Selector Guide). The nominal resistor temperature coefficient is 35ppm/°C end-to-end, and only 5ppm/°C ratiometric, making these devices ideal for applications requiring low-temperature-coefficient voltage-dividers, such as low-drift, programmable gain-amplifiers. The MAX5481–MAX5484 operate with either a +2.7V to +5.25V single power supply or ±2.5V dual power supplies. These devices consume 400µA (max) of supply current when writing data to the nonvolatile memory and 1.0µA (max) of standby supply current. The MAX5481–MAX5484 are available in a space-saving (3mm x 3mm), 16-pin TQFN, or a 14-pin TSSOP package and are specified over the extended (-40°C to +85°C) temperature range.
Features
♦ 1024 Tap Positions ♦ Power-On Recall of Wiper Position from Nonvolatile Memory ♦ 16-Pin (3mm x 3mm x 0.8mm) TQFN or 14-Pin TSSOP Package ♦ 35ppm/°C End-to-End Resistance Temperature Coefficient ♦ 5ppm/°C Ratiometric Temperature Coefficient ♦ 10kΩ and 50kΩ End-to-End Resistor Values ♦ Pin-Selectable SPI-Compatible Serial Interface or Up/Down Digital Interface ♦ 1µA (max) Standby Current ♦ Single +2.7V to +5.25V Supply Operation ♦ Dual ±2.5V Supply Operation
MAX5481–MAX5484
Pin Configurations
DIN(U/D) 10 TOP VIEW CS SCLK(INC) SPI/UD 9 8 7 VSS N.C. N.C. N.C.
12
GND
11
13 14 15 16 1 H
INTERFACE
VDD N.C.
VSS
MAX5481* MAX5482*
6 5
2 W
3 L DIN(U/D) 10
4 N.C. SPI/UD 9 8 7 VSS N.C. N.C. N.C.
TQFN
*SEE FUNCTIONAL DIAGRAM
Gain and Offset Adjustment LCD Contrast Adjustment Pressure Sensors
Low-Drift Programmable Gain Amplifiers Mechanical Potentiometer Replacement
GND
12 13 14 15 16 1 D.N.C.
11
INTERFACE
VDD
SCLK(INC)
Applications
CS
Ordering Information
PART MAX5481ETE MAX5481EUD PIN-PACKAGE 16 TQFN-EP* 14 TSSOP PKG CODE T1633F-3 U14-1 TOP MARK ACP —
N.C.
VSS
MAX5483 MAX5484
6 5
2 W
3 L
4 N.C.
TQFN
Note: All devices are specified over the -40°C to +85°C operating temperature range. *EP = Exposed pad. Ordering Information continued at end of data sheet.
Pin Configurations continued at end of data sheet. Selector Guide appears at end of data sheet. SPI is a trademark of Motorola, Inc. 1
________________________________________________________________ Maxim Integrated Products
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.
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10-Bit, Nonvolatile, Linear-Taper Digital Potentiometers MAX5481–MAX5484
ABSOLUTE MAXIMUM RATINGS
VDD to GND ...........................................................-0.3V to +6.0V VSS to GND............................................................-3.5V to +0.3V VDD to VSS .............................................................-0.3V to +6.0V H, L, W to VSS ..................................(VSS - 0.3V) to (VDD + 0.3V) CS, SCLK(INC), DIN(U/D), SPI/UD to GND ..-0.3V to (VDD + 0.3V) Maximum Continuous Current into H, L, and W MAX5481/MAX5483.........................................................±5mA MAX5482/MAX5484......................................................±1.0mA Maximum Current into Any Other Pin ...............................±50mA Continuous Power Dissipation (TA = +70°C) 16-Pin TQFN (derate 17.5mW/°C above +70°C) .....1398.6mW 14-Pin TSSOP (derate 9.1mW/°C above +70°C) ..........727mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-60°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 a.