Rainbow Electronics MAX5499 - Manual

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
♦ 10kΩ and 50kΩ End-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.