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PDF MAX5401 Data sheet ( Hoja de datos )
| Número de pieza | MAX5401 | |
| Descripción | 256-Tap SOT-PoT / Low-Drift Digital Potentiometers in SOT23 | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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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
MAX5401EKA-T -40°C to +85°C
8-SOT23
8-SOT23
50
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
VDD
8-BIT
SHIFT
8
8-BIT
LATCH
8
DECODER
REGISTER
DIN
H
W
L
SCLK
CS
CLOCK
LOGIC
MAX5400/MAX5401
POR
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 SOT-PoT,
Low-Drift Digital Potentiometers in SOT23
(TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
TAP-to-TAP SWITCHING TRANSIENT
(FROM CODE 127 toc CODE 128)
MAX5400 Toc10
10mV/div
VW-L
2.5V
SUPPLY CURRENT vs.
INPUT LOGIC VOLTAGE
10
1
VDD = +5V
0.1
5V/div
0.01
CS
0
0.001
VDD = +3V
0.10
0.08
0.06
0.04
0.02
0
-0.02
-0.04
-0.06
-0.08
-0.10
0
VOLTAGE DIVIDER DNL
vs. INPUT CODE (50kΩ)
32 64 96 128 160 192 224 256
INPUT CODE-DECIMAL
0.0001
0
123
4
DIGITAL INPUT VOLTAGE (V)
5
VOLTAGE DIVIDER INL
vs. INPUT CODE (50kΩ)
0.20
VDD = +2.7V to +5.5V
0.15
0.10
0.05
0
-0.05
-0.10
-0.15
-0.20
0
32 64 96 128 160 192 224 256
INPUT CODE-DECIMAL
PIN NAME
FUNCTION
1 L Low Terminal of Resistor
2
GND
Ground
3 CS Chip Select Input
4 DIN Serial Data Input
5
SCLK
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 8 Páginas | |
| PDF Descargar | [ Datasheet MAX5401.PDF ] | |
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