MAX5400 Datasheet, PDF (1/8 Pages) Maxim Integrated Products – 256-Tap SOT-PoT, Low-Drift Digital Potentiometers in SOT23

19-1848; Rev 0; 10/00
256-Tap SOT-PoT,
Low-Drift Digital Potentiometers in SOT23
General Description
The MAX5400/MAX5401 digital potentiometers offer
256-tap SOT-PoT™ digitally controlled variable resis-
tors in tiny 8-pin SOT23 packages. Each device func-
tions as a mechanical potentiometer, consisting of a
fixed resistor string with a digitally controlled wiper con-
tact. They operate from +2.7V to +5.5V single-supply
voltages and use an ultra-low supply current of 0.1µA.
These devices also provide glitchless switching
between resistor taps, as well as a convenient power-
on reset that sets the wiper to the midscale position at
power-up. A low 5ppm/°C ratiometric temperature coef-
ficient makes it ideal for applications requiring low drift.
The MAX5400/MAX5401 serve well in applications
requiring digitally controlled resistors, including
adjustable voltage references and programmable gain
amplifiers (PGAs). A nominal end-to-end resistor tem-
perature coefficient of 50ppm/°C allows these parts to
be used as variable resistors in applications such as
low-tempco adjustable gain and other circuit configura-
tions.
Two resistance values are available: 50kΩ (MAX5400)
and 100kΩ (MAX5401). Each device is guaranteed over
the extended industrial temperature range (-40°C to
+85°C).
________________________Applications
Mechanical Potentiometer Replacement
Low-Drift PGAs
Adjustable Voltage References
Features
o Miniature 8-Pin SOT23 (3mm x 3mm)
o 256 Tap Positions
o Ultra-Low 0.1µA Supply Current
o Single-Supply Operation: +2.7V to +5.5V
o Low Ratiometric Temperature Coefficient:
5ppm/°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 50kΩ/100kΩ Resistor Values
Ordering Information
PART
TEMP.
RANGE
PIN-
PACKAGE
R (kΩ)
MAX5400EKA-T -40°C to +85°C 8-SOT23
50
MAX5401EKA-T -40°C to +85°C 8-SOT23
100
SOT-PoT is a trademark of Maxim Integrated Products.
SPI is a trademark of Motorola, Inc.
Pin Configuration appears at end of data sheet.
Functional Diagram
V_DD
H
8
8-BIT
SHIFT
8-BIT
LATCH
8
DECODER
W
REGISTER
DIN
L
SCLK
CS
CLOCK
LOGIC
MAX5400/MAX5401
POR
GND
________________________________________________________________ Maxim Integrated Products 1
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