max5402euat Maxim Integrated Products, Inc., max5402euat Datasheet

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max5402euat

Manufacturer Part Number
max5402euat
Description
Max5402 256-tap, ?pot Low-drift, Digital Potentiometer
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
The MAX5402 µPoT
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).
19-1896; Rev 0; 1/01
________________________Applications
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
SCLK
DIN
CS
Mechanical Potentiometer Replacement
Low-Drift PGAs
Adjustable Voltage References
REGISTER
CLOCK
LOGIC
SHIFT
8-BIT
R
________________________________________________________________ Maxim Integrated Products
8
digital potentiometer is a 256-tap
General Description
LATCH
Functional Diagram
8-BIT
R
GND
V
DD
POR
8
DECODE
MAX5402
256
H
W
L
256-Tap, µPoT, Low-Drift,
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
o Low End-to-End Resistor Temperature Coefficient
o Power-On Reset: Wiper Goes to Midscale
o Glitchless Switching Between the Resistor Taps
o 3-Wire SPI™-Interface Compatible
o 10kΩ Resistor Value
µPoT is a trademark of Maxim Integrated Products.
SPI is a trademark of Motorola, Inc.
MAX5402EUA
(Position 128)
Digital Potentiometer
TOP VIEW
5ppm/°C
35ppm/°C
PART
GND
DIN
CS
L
-40°C to +85°C
1
2
4
3
Ordering Information
RANGE
TEMP.
MAX5402
µMAX
Pin Configuration
PIN-
PACKAGE
8 µMAX
7
6
5
8
H
V
W
SCLK
DD
Features
R (kΩ)
10
1

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max5402euat Summary of contents

Page 1

Rev 0; 1/01 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 ...

Page 2

Low-Drift, Digital Potentiometer ABSOLUTE MAXIMUM RATINGS V to GND ..............................................................-0.3V to +6V DD DIN, SCLK GND ............................................-0. GND .............................................-0. Maximum Continuous Current into Pins H, L, and W ...

Page 3

ELECTRICAL CHARACTERISTICS (continued +5V MIN PARAMETER SYMBOL SCLK Pulse Width Low CS Fall to SCLK Rise Setup Time SCLK Rise to CS Rise ...

Page 4

Low-Drift, Digital Potentiometer (T = +25°C, unless otherwise noted.) A WIPER RESISTANCE vs. WIPER VOLTAGE 300 275 250 V = +3V DD 225 200 175 150 125 100 WIPER VOLTAGE (V) RESISTANCE vs. INPUT ...

Page 5

A = +25°C, unless otherwise noted.) VOLTAGE-DIVIDER INL vs. INPUT CODE 0.20 0.15 0.10 0.05 0.00 -0.05 -0.10 -0.15 -0. 128 160 192 224 256 INPUT CODE (DECIMAL) TAP-TO-TAP SWITCHING TRANSIENT V W-L CS 200ns/div ...

Page 6

Low-Drift, Digital Potentiometer CS SCLK 1ST CLOCK PULSE DIN D7 MSB TIME Figure 1. Serial Interface Timing Diagram CS t CSS t CSO SCLK DIN Figure 2. Detailed Serial Interface Timing Diagram Detailed Description ...

Page 7

Data Word B0 (D7) B1 (D6) B2 (D5) (MSB) First Bit In Figure 3. Serial Data Format Applications Information The MAX5402 is intended for a variety of circuits where accurate, fine-tuned adjustable resistance is required, such as in adjustable voltage ...

Page 8

Low-Drift, Digital Potentiometer +5V VIN V O OUT MAX6160 W ADJ GND 1.23V ✕ 255 WHERE C IS THE DECIMAL EQUIVALENT WRITTEN CODE. Figure 6. Adjustable Voltage Reference 8 _______________________________________________________________________________________ TRANSISTOR COUNT: 3475 PROCESS: ...

Page 9

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim ...

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