Datasheet

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General Description

The MAX5450–MAX5455 are a family of dual digital

potentiometers that perform the same function as a

mechanical potentiometer or variable resistor. The

MAX5451/MAX5453/MAX5455 have two 3-terminal

potentiometers and the MAX5450/MAX5452/MAX5454

have two 2-terminal variable resistors. The MAX5450–

MAX5455 operate from a +2.7V to +5.5V single-supply

voltage and use an ultra-low supply current of 0.1µA.

These devices consist of two fixed resistors each

with 256 digitally-controlled wiper contacts. The conve-

nient power-on reset (POR) sets the wiper to midscale

position at power-up and the easy-to-use up/down

interface allows glitchless switching between

resistor taps. Six inputs control the 14-pin MAX5451/

MAX5453/MAX5455 potentiometers. Four inputs control

the 10-pin MAX5450/MAX5452/MAX5454 variable resis-

tors.

The MAX5450–MAX5455 are ideal for applications

requiring digitally-controlled resistors. Three resistance

values are available: 10kΩ, 50kΩ, and 100kΩ. An end-

to-end resistor temperature coefficient of 35ppm/°C

and a ratiometric temperature coefficient of 5ppm/°C

make the MAX5450–MAX5455 excellent choices for

adjustable gain circuit requiring low-temperature drift

The MAX5450–MAX5455 are available in 10-pin µMAX

and 14-pin TSSOP packages. Each device is guaran-

teed over the extended–industrial temperature range

(-40°C to +85°C).

Applications

Mechanical Potentiometer Replacement

Low-Drift Programmable-Gain Amplifier (PGA)

Volume Control

LCD Screen Adjustment

Adjustable Voltage References

Adjustable Linear Regulators

Programmable Filters, Delays, Time Constants

Impedance Matching

Features

♦ Small-Footprint Packages

10-Pin µMAX (MAX5450/MAX5452/MAX5454)

14-Pin TSSOP (MAX5451/MAX5453/MAX5455)

♦ 256-Tap Positions

♦ Independent Up/Down Potentiometer Controls

(MAX5451/MAX5453/MAX5455)

♦ Ultra-Low 0.1µA Supply Current

♦ +2.7V to +5.5V Single-Supply Operation

♦ Low 35ppm/°C End-to-End Temperature

Coefficient

♦ Power-On Reset Sets Wiper to Midscale

(Position 127)

♦ Glitchless Switching Between the Resistor Taps

♦ 10kΩ, 50kΩ, 100kΩ Resistance Values

MAX5450–MAX5455

Dual, 256-Tap, Up/Down Interface,

Digital Potentiometers

________________________________________________________________ Maxim Integrated Products 1

INC

GND

W2W1

MAX5450

MAX5452

MAX5454

µMAX

TOP VIEW

L2L1

GNDV

MAX5451

MAX5453

MAX5455

L2L1

TSSOP

U/D

CS1 CS2

INC1

INC2

U/D1

U/D2

CS2

CS1

Pin Configurations

19-1997; Rev 2; 2/06

Ordering Information

PART PIN-PACKAGE R (kΩ)

PKG

CODE

MAX5450EUB 10 µMAX 10 U10C-4

MAX5451EUD 14 TSSOP 10 U14-1

MAX5452EUB 10 µMAX 50 U10C-4

MAX5453EUD 14 TSSOP 50 U14-1

MAX5454EUB 10 µMAX 100 U10C-4

MAX5455EUD 14 TSSOP 100 U14-1

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Note: All devices specified over the -40°C to +85°C operating

range.

µMAX is a registered trademark of Maxim Integrated Products, Inc.

Summary of content (12 pages)

PAGE 1
9-1997; Rev 2; 2/06 Dual, 256-Tap, Up/Down Interface, Digital Potentiometers Features The MAX5450–MAX5455 are a family of dual digital potentiometers that perform the same function as a mechanical potentiometer or variable resistor. The MAX5451/MAX5453/MAX5455 have two 3-terminal potentiometers and the MAX5450/MAX5452/MAX5454 have two 2-terminal variable resistors. The MAX5450– MAX5455 operate from a +2.7V to +5.5V single-supply voltage and use an ultra-low supply current of 0.1µA.
PAGE 2
MAX5450–MAX5455 Dual, 256-Tap, Up/Down Interface, Digital Potentiometers ABSOLUTE MAXIMUM RATINGS VDD to GND ..............................................................-0.3V to +6V CS_, INC_, and U/D_ to GND...................................-0.3V to +6V H_, L_, W_ to GND ......................................-0.3V to (VDD +0.3V) Maximum Continuous Current into H_, L_, and W_............±1mA Continuous Power Dissipation (TA = +70°C) 10-Pin µMAX (derate 6.94mW/°C above +70°C) ..........
PAGE 3
Dual, 256-Tap, Up/Down Interface, Digital Potentiometers (VDD = +2.7V to +5.5V, VH = VDD, VL = 0; TA = TMIN to TMAX, unless otherwise noted. Typical values are at VDD = +5V, TA = +25°C, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DIGITAL INPUTS (Note 5) Input High Voltage VIH Input Low Voltage VIL 0.7 x VDD V 0.3 x VDD Input Leakage Current ±1.0 Input Capacitance 5 V µA pF TIMING CHARACTERISTICS (Analog) Wiper-Settling Time (Note 6) tIW MAX5451 0.
PAGE 4
Typical Operating Characteristics (VDD = +5V, TA = +25°C, unless otherwise noted.) 240 220 VDD = +5V 200 VDD = +3V 320 300 280 VDD = +5V 260 240 220 180 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 280 260 240 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 WIPER VOLTAGE (V) WIPER VOLTAGE (V) WIPER RESISTANCE vs. WIPER POSITION (10kΩ) WIPER RESISTANCE vs. WIPER POSITION (50kΩ) WIPER RESISTANCE vs.
PAGE 5
Dual, 256-Tap, Up/Down Interface, Digital Potentiometers (VDD = +5V, TA = +25°C, unless otherwise noted.) VARIABLE RESISTOR INL vs. WIPER POSITION (MAX5453) DNL (LSB) -0.04 -0.06 -0.08 -0.10 -0.12 -0.14 -0.16 0 32 64 96 -0.20 0 32 64 128 160 192 224 256 0 64 0.10 0.02 0.06 256 0.05 0.00 -0.05 -0.10 0.00 160 192 224 0.07 DNL (LSB) INL (LSB) 0.03 128 0.08 0.05 0.04 96 VOLTAGE-DIVIDER DNL vs. WIPER POSITION (50kΩ) MAX5450/5 toc14 0.15 0.01 0.04 0.03 0.02 0.01 0.00 -0.15 -0.
PAGE 6
Typical Operating Characteristics (continued) (VDD = +5V, TA = +25°C, unless otherwise noted.) SUPPLY CURRENT vs. TEMPERATURE SUPPLY CURRENT vs. DIGITAL INPUT VOLTAGE 1.2 VDD = 5V 0.1 IDD (mA) 1.0 0.8 0.6 VDD = 3V 0.01 VDD = +5V 0.8 SUPPLY CURRENT (µA) DIGITAL INPUTS + VDD MAX5450/5 toc20 1 MAX5450/5 toc19 1.4 1.0 0.6 0.4 VDD = +3V 0.4 0.2 0.001 0.2 0 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 0.0001 0 0 1 2 3 4 5 0 6 1 2 3 END-TO-END RESISTANCE % CHANGE vs.
PAGE 7
Dual, 256-Tap, Up/Down Interface, Digital Potentiometers PIN MAX5451 MAX5453 MAX5455 MAX5450 MAX5452 MAX5454 NAME 1 1 CS1 Chip-Select Input of Resistor 1. Drive low to change wiper position W1 through INC and U/D. — 2 U/D Up/Down Control Input. With U/D low, a high-to-low INC transition decrements wiper position. With U/D high, a high-to-low INC transition increments wiper position. 2 — U/D1 Up/Down Control Input of Resistor 1.
PAGE 8
MAX5450–MAX5455 Dual, 256-Tap, Up/Down Interface, Digital Potentiometers CS_ tCI tIC tIL INC_ tIH tDI U/D_ tID tIW W_ Figure 1. Digital Interface and Timing diagram Detailed Description The MAX5450–MAX5455 contain two independent resistor arrays each with 255-resistive elements. 256tap points are accessible to the wiper along the resistor arrays between H and L (Figure 2). Power-on reset circuitry sets the wiper to midscale (position 127) at power-up.
PAGE 9
Dual, 256-Tap, Up/Down Interface, Digital Potentiometers W1 CS1 S256 UP/DOWN COUNTER INC U/D R255 POSITION DECODER L1 VDD S255 R254 GND CS2 S254 MAX5450 MAX5452 MAX5454 POWER-ON RESET UP/DOWN COUNTER W W2 POSITION DECODER L2 R2 S3 Figure 3. MAX5450/MAX5452/MAX5454 Simplified Functional Diagram R1 S2 S1 L Figure 2.
PAGE 10
MAX5450–MAX5455 Dual, 256-Tap, Up/Down Interface, Digital Potentiometers VCC VIN VOUT OUT1 VOUT1 OUT2 VOUT2 W1 MAX4493 W2 MAX8866 VEE MAX5450 MAX5452 MAX5454 W V+ MAX5450 MAX5452 MAX5454 IN L1 SHDN1 SET1 SHDN2 SET2 L2 GND L Figure 7. Adjustable Dual Linear Regulator Figure 6a.
PAGE 11
Dual, 256-Tap, Up/Down Interface, Digital Potentiometers 10LUMAX.EPS e 4X S 10 10 INCHES H Ø0.50±0.1 0.6±0.1 1 1 0.6±0.1 BOTTOM VIEW TOP VIEW D2 MILLIMETERS MAX DIM MIN 0.043 A 0.006 A1 0.002 A2 0.030 0.037 D1 0.120 0.116 0.118 D2 0.114 E1 0.116 0.120 0.118 E2 0.114 0.199 H 0.187 L 0.0157 0.0275 L1 0.037 REF b 0.007 0.0106 e 0.0197 BSC c 0.0035 0.0078 0.0196 REF S α 0° 6° MAX MIN 1.10 0.15 0.05 0.75 0.95 3.05 2.95 2.89 3.00 2.95 3.05 2.89 3.00 4.75 5.05 0.40 0.70 0.940 REF 0.177 0.270 0.
PAGE 12
Dual, 256-Tap, Up/Down Interface, Digital Potentiometers TSSOP4.40mm.EPS MAX5450–MAX5455 Package Information (continued) PACKAGE OUTLINE, TSSOP 4.40mm BODY 21-0066 G 1 1 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.