MAX5402 Datasheet, PDF (1/9 Pages) Maxim Integrated Products – 256-Tap, μPoT, Low-Drift, Digital Potentiometer

19-1896; Rev 0; 1/01
256-Tap, µPoT, Low-Drift,
Digital Potentiometer
General Description
The MAX5402 µPoT^™ digital potentiometer is a 256-tap
variable resistor with 10kΩ total resistance in a tiny 8-
pin µMAX package. This device functions as a mechan-
ical potentiometer, consisting of a fixed resistor string
with a digitally controlled wiper contact. It operates
from +2.7V to +5.5V single-supply voltages and uses
an ultra-low 0.1µA supply current. This device also pro-
vides glitchless switching between resistor taps, as well
as a convenient power-on reset (POR) that sets the
wiper to the midscale position at power-up. A low
5ppm/°C ratiometric temperature coefficient makes it
ideal for applications requiring low drift.
The MAX5402 serves well in applications requiring digi-
tally controlled resistors, including adjustable voltage
references and programmable gain amplifiers (PGAs).
A nominal end-to-end resistor temperature coefficient of
35ppm/°C makes this part suitable for use as a variable
resistor in applications such as low-tempco adjustable
gain and other circuit configurations. This device is
guaranteed over the extended industrial temperature
range (-40°C to +85°C).
Features
o Small Footprint, 8-Pin µMAX Package
o Ultra-Low 100nA Supply Current
o +2.7V to +5.5V Single-Supply Operation
o 256 Tap Positions
o Low Ratiometric Temperature Coefficient
5ppm/°C
o Low End-to-End Resistor Temperature Coefficient
35ppm/°C
o Power-On Reset: Wiper Goes to Midscale
(Position 128)
o Glitchless Switching Between the Resistor Taps
o 3-Wire SPI™-Interface Compatible
o 10kΩ Resistor Value
________________________Applications
Mechanical Potentiometer Replacement
Low-Drift PGAs
Adjustable Voltage References
Ordering Information
PART
TEMP.
RANGE
PIN-
PACKAGE
MAX5402EUA -40°C to +85°C 8 µMAX
µPoT is a trademark of Maxim Integrated Products.
SPI is a trademark of Motorola, Inc.
R (kΩ)
10
Functional Diagram
V_DD
H
R
8-BIT
8
R
8-BIT
LATCH
8
256
DECODE
W
SHIFT
DIN
REGISTER
L
SCLK
CS
CLOCK
LOGIC
MAX5402
POR
Pin Configuration
TOP VIEW
L1
GND 2
CS 3
DIN 4
MAX5402
8H
7W
6 V_DD
5 SCLK
µMAX
GND
________________________________________________________________ Maxim Integrated Products 1
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