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Rainbow Electronics MAX5499 User Manual

General description, Applications, Features

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General Description

The MAX5494–MAX5499 10-bit (1024-tap), dual, non-
volatile, 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, programma-
ble 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 inter-
face allows communication at data rates up to 7MHz.

The MAX5494–MAX5499 are ideal for applications requir-
ing digitally controlled potentiometers. End-to-end resis-
tance values of 10k

Ω and 50kΩ are available with a

35ppm/°C end-to-end temperature coefficient. The ratio-
metric temperature coefficient is 5ppm/°C for each chan-
nel, making these devices ideal for applications requiring
low-temperature-coefficient programmable voltage-
dividers 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.

Applications

Gain and Offset Adjustment

LCD Contrast Adjustment

Pressure Sensors

Low-Drift Programmable-Gain Amplifiers

Mechanical Potentiometer Replacement

Volume Control

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
10kand 50kEnd-to-End Resistor Values
3-Wire SPI-Compatible Serial Interface
Reliability (T

A

= +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

10-Bit, Dual, Nonvolatile, Linear-Taper

Digital Potentiometers

________________________________________________________________ Maxim Integrated Products

1

16

1

2

3

4

12

11

10

9

15

14

13

5

6

7

8

SCLK

N.C.

N.C.

DIN

GND

INTERF

ACE

W1

L1

H1

W2

L2

H2

V

DD

N.C.

N.C.

V

SS

TOP VIEW

MAX5494
MAX5495

CS

5mm

× 5mm × 0.8mm TQFN

16

1

2

3

4

12

11

10

9

15

14

13

5

6

7

8

SCLK

N.C.

N.C.

DIN

GND

INTERF

ACE

W1

L1

D.N.C.

W2

L2

D.N.C.

V

DD

N.C.

N.C.

V

SS

MAX5496
MAX5497

CS

5mm

× 5mm × 0.8mm TQFN

PART

TEMP RANGE

PIN-
PACKAGE

PKG CODE

MAX5494ETE

-40°C to +85°C

16 TQFN-EP*

T1655-2

MAX5495ETE

-40°C to +85°C

16 TQFN-EP*

T1655-2

Pin Configurations

Ordering Information

19-3562; Rev 1; 6/05

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.

*EP = Exposed pad.
Ordering Information continued at end of data sheet.
Selector Guide appears at end of data sheet.

Pin Configurations continued at end of data sheet.

SPI is a trademark of Motorola, Inc.