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PDF MAX5402 Data sheet ( Hoja de datos )
| Número de pieza | MAX5402 | |
| Descripción | 256-Tap / PoT / Low-Drift / Digital Potentiometer | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX5402 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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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
VDD
DIN
SCLK
CS
R
8-BIT
SHIFT
REGISTER
8
R
8-BIT
LATCH
8
256
DECODE
CLOCK
LOGIC
MAX5402
POR
H
W
L
Pin Configuration
TOP VIEW
L1
GND 2
CS 3
DIN 4
MAX5402
8H
7W
6 VDD
5 SCLK
µMAX
GND
________________________________________________________________ Maxim Integrated Products 1
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.
1 page  
256-Tap, µPoT, Low-Drift,
Digital Potentiometer
(TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
VOLTAGE-DIVIDER INL vs. INPUT CODE
0.20
0.15
0.10
0.05
0.00
-0.05
-0.10
-0.15
-0.20
0
32 64 96 128 160 192 224 256
INPUT CODE (DECIMAL)
TAP-TO-TAP SWITCHING TRANSIENT
MAX5402 toc09
+2.51V
VW-L +2.49V
+5V
CS
0
200ns/div
(CODE 127 TO 128)
SUPPLY CURRENT vs. TEMPERATURE
1.2
1.0
VDD = +5V
0.8
0.6
0.4
0.2
VDD = +3V
0.0
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80
TEMPERATURE (°C)
INPUT LOGIC VOLTAGE
10
1
0.1
VDD = +5V
0.01
0.001
0.0001
0
VDD = +3V
1234
DIGITAL INPUT VOLTAGE (V)
5
PIN NAME
FUNCTION
1 L Low Terminal of Resistor
2
GND
Ground
3 CS Chip Select Input
4 DIN Serial Data Input
5
SCLK
Serial Clock Input
6 VDD Power Supply. Bypass with a 0.1µF capacitor to GND.
7 W Wiper Terminal
8 H High Terminal of Resistor
Pin Description
________________________________________________________________________________________ 5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet MAX5402.PDF ] | |
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