Document
19-3562; Rev 1; 6/05
www.DataSheet4U.com
10-Bit, Dual, Nonvolatile, Linear-Taper Digital Potentiometers
General Description
The MAX5494–MAX5499 10-bit (1024-tap), dual, nonvolatile, linear-taper, programmable voltage-dividers and variable resistors perform the function of a mechanical potentiometer, but replace the mechanics with a 3-wire SPI™-compatible serial interface. The MAX5494/MAX5495 are dual, 3-terminal, programmable voltage-dividers; the MAX5496/MAX5497 are dual, 2-terminal variable resistors; and the MAX5498/ MAX5499 include one 2-terminal variable resistor and one 3-terminal programmable voltage-divider. The MAX5494–MAX5499 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. The MAX5494–MAX5499 are ideal for applications requiring digitally controlled potentiometers. End-to-end resistance values of 10kΩ and 50kΩ are available with a 35ppm/°C end-to-end temperature coefficient. The ratiometric temperature coefficient is 5ppm/°C for each channel, making these devices ideal for applications requiring low-temperature-coefficient programmable voltagedividers such as low-drift, programmable-gain amplifiers. The MAX5494–MAX5499 operate with either a single power supply (+2.7V to +5.25V) or dual power supplies (±2.5V). The devices consume 400µA (max) of supply current when writing data to the nonvolatile memory and 1.5µA (max) of standby supply current. The devices are available in space-saving (5mm x 5mm x 0.8mm), 16-pin TQFN package and are specified over the extended (-40°C to +85°C) temperature range.
Features
♦ Wiper Position Stored in Nonvolatile Memory and Recalled Upon Power-Up ♦ 16-Pin, 5mm x 5mm x 0.8mm TQFN Package ♦ 35ppm/°C End-to-End Resistance Temperature Coefficient ♦ 5ppm/°C Ratiometric Temperature Coefficient ♦ 10kΩ and 50kΩ End-to-End Resistor Values ♦ 3-Wire SPI-Compatible Serial Interface ♦ Reliability (TA = +85°C) 50,000 Wiper Store Cycles 50 Years Wiper Data Retention ♦ 1.5µA (max) Standby Current ♦ Single +2.7V to +5.25V Supply Operation ♦ Dual ±2.5V Supply Operation
MAX5494–MAX5499
Pin Configurations
GND W1
TOP VIEW
12 DIN 13 N.C. 14 N.C. 15 SCLK 16 1 CS INTERFACE
11
10
H1 9 8 7 VSS N.C. N.C. VDD
MAX5494 MAX5495
L1
6 5
W2
N.C. 14 N.C. 15
INTERFACE
Gain and Offset Adjustment LCD Contrast Adjustment Pressure Sensors Low-Drift Programmable-Gain Amplifiers Mechanical Potentiometer Replacement Volume Control
5mm × 5mm × 0.8mm TQFN
D.N.C. 9 8 7 VSS N.C. N.C. VDD GND W1 L1 10
12 DIN 13
11
Ordering Information
PART MAX5494ETE MAX5495ETE TEMP RANGE PINPACKAGE PKG CODE T1655-2 T1655-2
SCLK 16
MAX5496 MAX5497
H2
L2
Applications
2
3
4
6 5
-40°C to +85°C 16 TQFN-EP* -40°C to +85°C 16 TQFN-EP*
1 CS
2 W2
3 L2
4 D.N.C.
*EP = Exposed pad. Ordering Information continued at end of data sheet. Selector Guid.