MAX5401EKA+T Maxim Integrated Products, MAX5401EKA+T Datasheet

IC DIGITAL POT 256-TAP SOT23-8

MAX5401EKA+T

Manufacturer Part Number
MAX5401EKA+T
Description
IC DIGITAL POT 256-TAP SOT23-8
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX5400EKAT.pdf (8 pages)

Specifications of MAX5401EKA+T

Taps
256
Resistance (ohms)
100K
Number Of Circuits
1
Temperature Coefficient
50 ppm/°C Typical
Memory Type
Volatile
Interface
SPI, 3-Wire Serial
Voltage - Supply
2.7 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
SOT-23-8
Resistance In Ohms
100K
Number Of Pots
Single
Taps Per Pot
256
Resistance
100 KOhms
Wiper Memory
Volatile
Digital Interface
Serial (3-Wire, SPI)
Operating Supply Voltage
5 V
Supply Current
0.0007 mA (Typ)
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Description/function
256-Tap SOT-PoT, Low-Drift Digital Potentiometers in SOT23
Mounting Style
SMD/SMT
Supply Voltage (max)
5.5 V
Supply Voltage (min)
2.7 V
Tolerance
25 %
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
MAX5401EKA+TTR
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).
19-1848; Rev 0; 10/00
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.
________________________Applications
Mechanical Potentiometer Replacement
Low-Drift PGAs
Adjustable Voltage References
SCLK
DIN
Low-Drift Digital Potentiometers in SOT23
CS
________________________________________________________________ Maxim Integrated Products
General Description
REGISTER
CLOCK
LOGIC
SHIFT
8-BIT
8
LATCH
8-BIT
GND
V
DD
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:
o Power-On Reset: Wiper Goes to Midscale
o Glitchless Switching Between the Resistor Taps
o 3-Wire SPI™-Interface Compatible
o 50kΩ/100kΩ Resistor Values
Pin Configuration appears at end of data sheet.
SOT-PoT is a trademark of Maxim Integrated Products.
SPI is a trademark of Motorola, Inc.
POR
MAX5400EKA-T
MAX5401EKA-T
(Position 128)
5ppm/°C
8
PART
MAX5400/MAX5401
256-Tap SOT-PoT,
DECODER
-40°C to +85°C
-40°C to +85°C
Ordering Information
RANGE
TEMP.
Functional Diagram
PIN-
PACKAGE
8-SOT23
8-SOT23
Features
H
W
L
R (kΩ)
100
50
1

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MAX5401EKA+T Summary of contents

Page 1

... 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 PART MAX5400EKA-T MAX5401EKA-T SOT-PoT is a trademark of Maxim Integrated Products. SPI is a trademark of Motorola, Inc. Pin Configuration appears at end of data sheet 8-BIT ...

Page 2

SOT-PoT, Low-Drift Digital Potentiometers in SOT23 ABSOLUTE MAXIMUM RATINGS V to GND ............................................................. -0.3V to +6V DD DIN, SCLK GND ............................................-0. GND...........................................-0. Maximum Continuous Current into Pins H, L, ...

Page 3

Low-Drift Digital Potentiometers in SOT23 ELECTRICAL CHARACTERISTICS (continued +5V sured +25°C. Values over full temperature range are guaranteed by design.) ...

Page 4

SOT-PoT, Low-Drift Digital Potentiometers in SOT23 ( +25°C, unless otherwise noted.) WIPER RESISTANCE vs. VOLTAGE 600 500 V = +3V 400 DD 300 V = +5V DD 200 100 WIPER ...

Page 5

Low-Drift Digital Potentiometers in SOT23 ( +25°C, unless otherwise noted.) TAP-to-TAP SWITCHING TRANSIENT (FROM CODE 127 toc CODE 128) V W-L CS VOLTAGE DIVIDER DNL vs. INPUT CODE (50kΩ) 0.10 0.08 0.06 0.04 0.02 0 -0.02 -0.04 -0.06 ...

Page 6

SOT-PoT, Low-Drift Digital Potentiometers in SOT23 CS SCLK 1ST CLOCK PULSE DIN D7 MSB TIME Figure 2. Serial Interface Timing Diagram CS t CSS t CSO SCLK DIN Figure 3. Detailed Serial Interface Timing Diagram ...

Page 7

Low-Drift Digital Potentiometers in SOT23 B0 (D7) B1 (D6) B2 (D5) (MSB) FIRST BIT IN Figure 4. Serial Data Format Applications Information The MAX5400/MAX5401 are intended for a variety of circuits that require accurate, fine-tuning adjustable resistance, such as adjustable ...

Page 8

... Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2000 Maxim Integrated Products © ...

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