Datasheet

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General Description

The MAX5403/MAX5404/MAX5405 is a family of dual

linear taper digital potentiometers. Each device has one

3-terminal potentiometer and one 2-terminal variable

resistor (Figure 1). The MAX5403/MAX5404/MAX5405

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

resistors taps as well as a convenient power-on reset

(POR) that sets the wiper to the midscale position at

power-up. The potentiometer consists of a fixed resistor

with a wiper contact that is digitally controlled through a

3-wire serial interface and has 256-tap points. It per-

forms the same function as a discrete potentiometer or

variable resistor.

These parts are ideal for applications requiring digitally

controlled resistors. Three resistance values are avail-

able: 10kΩ (MAX5403), 50kΩ (MAX5404), and 100kΩ

(MAX5405). A nominal resistor-temperature coefficient

of 35ppm/°C end-to-end and 5ppm/°C ratiometric make

the MAX5403/MAX5404/MAX5405 ideal for applications

requiring low temperature-coefficient variable resistors,

such as adjustable-gain circuit configurations.

The MAX5403/MAX5404/MAX5405 are available in a 10-

pin µMAX

package. Each device is guaranteed 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 Reference

Programmable Filters, Delays, Time Constant

Impedance Matching

Features

♦ 10-Pin µMAX Small Footprint Package

♦ 256-Tap Positions

♦ Ultra Low 0.1µA Supply Current

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

♦ Low End-To-End Temperature Coefficient:

35ppm/°C

♦ Low Ratiometric Temperature Coefficient:

5ppm/°C

♦ Power-On Reset: Wiper Goes to Midscale

(Position 128)

♦ Glitchless Switching Between Resistor Taps

♦ 3-Wire SPI™ -Interface Compatible

♦ 10kΩ/50kΩ/100kΩ Resistor Values

MAX5403/MAX5404/MAX5405

Dual 256-Tap, Low-Drift,

Digital Potentiometers in 10-µMAX

________________________________________________________________ Maxim Integrated Products 1

SCLKW

GND

MAX5403

MAX5404

MAX5405

µMAX

TOP VIEW

DINCS

Pin Configuration

Ordering Information

19-1934; Rev 2; 11/05

PART PIN-PACKAGE

(kΩ)

PKG

CODE

MAX5403EUB 10 µMAX 10 U10C-4

MAX5404EUB 10 µMAX 50 U10C-4

MAX5405EUB 10 µMAX 100 U10C-4

SPI is a registered trademark of Motorola, Inc.

µMAX is a registered trademark of Maxim Integrated

Products, Inc.

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 operate over the -40°C to +85°C temperature

range.

Summary of content (10 pages)

PAGE 1
9-1934; Rev 2; 11/05 Dual 256-Tap, Low-Drift, Digital Potentiometers in 10-µMAX The MAX5403/MAX5404/MAX5405 is a family of dual linear taper digital potentiometers. Each device has one 3-terminal potentiometer and one 2-terminal variable resistor (Figure 1). The MAX5403/MAX5404/MAX5405 operate from +2.7V to +5.5V single-supply voltages and use an ultra-low supply current of 0.1µA.
PAGE 2
MAX5403/MAX5404/MAX5405 Dual 256-Tap, Low-Drift, Digital Potentiometers in 10-µMAX ABSOLUTE MAXIMUM RATINGS VDD to GND ..............................................................-0.3V to +6V DIN, SCLK, CS .........................................................-0.3V to +6V HX, LX, WX to GND .......................................-0.3V to (VDD + 0.3) Maximum Continuous Current Into HX, LX, and WX ...........±1mA Continuous Power Dissipation (TA = +70°C) 10-Pin µMAX (derate 5.6mW/°C above +70°C) ........
PAGE 3
Dual 256-Tap, Low-Drift, Digital Potentiometers in 10-µMAX (VDD = +5V, unless otherwise noted. VH = VDD, VL = 0, TA = TMIN to TMAX. Typical values are at VDD = +5V, TA = +25°C, unless otherwise noted.) PARAMETER End-to-End Resistance SYMBOL RHL MIN TYP MAX MAX5403 CONDITIONS 7.5 10 12.5 MAX5404 37.5 50 62.5 MAX5405 75 100 125 UNITS kΩ DIGITAL INPUTS Input High Voltage VIH Input Low Voltage VIL 0.7 ✕ VDD V Input Leakage Current Input Capacitance 0.3 ✕ VDD V ±1.
PAGE 4
Typical Operating Characteristics (VDD = +5.0V, TA = +25°C, unless otherwise noted.) WIPER RESISTANCE vs. WIPER VOLTAGE (100kΩ) VDD = +3V 320 300 280 VDD = +5V 260 240 220 VDD = +3V 320 300 280 260 240 220 200 200 180 VDD = +5V 220 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 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-TO-END RESISTANCE vs. INPUT CODE (50kΩ) WIPER-TO-END RESISTANCE vs. INPUT CODE (100kΩ) WIPER-TO-END RESISTANCE vs.
PAGE 5
Dual 256-Tap, Low-Drift, Digital Potentiometers in 10-µMAX VARIABLE RESISTOR INL vs. INPUT CODE (50kΩ) -0.04 -0.06 -0.08 -0.10 -0.12 -0.14 -0.16 32 64 96 0.05 0.04 0.03 0.02 0.01 0.00 -0.01 -0.02 128 160 192 224 256 32 64 96 128 160 192 224 VOLTAGE-DIVIDER INL vs. INPUT CODE (10kΩ) MAX5403 toc13 0.15 0.10 0 256 0.03 0.02 0.01 64 96 128 160 192 224 0.00 -0.05 256 0.02 -0.01 -0.02 0 32 64 96 128 160 192 224 0 256 32 VOLTAGE-DIVIDER DNL vs. INPUT CODE (100kΩ) 0.07 0.06 0.04 0.
PAGE 6
Typical Operating Characteristics (continued) (VDD = +5.0V, TA = +25°C, unless otherwise noted.) SUPPLY CURRENT vs. LOGIC INPUT VOLTAGE SUPPLY CURRENT vs. TEMPERATURE VDD = +5V 0.1 0.01 VDD = +3V MAX5403 toc20 VDD = +5V 0.8 SUPPLY CURRENT (µA) 1 SUPPLY CURRENT (mA) 1.0 MAX5403 toc19 10 0.6 0.4 VDD = +3V 0.2 0.001 0.0001 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 INPUT LOGIC VOLTAGE (V) TEMPERATURE (°C) END-TO-END RESISTANCE % CHANGE vs.
PAGE 7
Dual 256-Tap, Low-Drift, Digital Potentiometers in 10-µMAX PIN NAME FUNCTION 1 GND 2 LB Low Terminal of Resistor B 3 HB High Terminal of Resistor B 4 WB Wiper Terminal of Resistor B 5 CS SPI Chip Select 6 DIN SPI Serial Data Input 7 SCLK 8 VDD Power Supply, +2.7V to +5.5V. Connect a 0.1µF capacitor to GND.
PAGE 8
MAX5403/MAX5404/MAX5405 Dual 256-Tap, Low-Drift, Digital Potentiometers in 10-µMAX POT REGISTER LOADED CS SCLK 1ST CLOCK PULSE DIN A0 D7 9TH CLOCK PULSE D6 D5 D4 MSB D3 D2 D1 D0 LSB TIME Figure 2. Potentiometer Serial Data Timing Circuit CS ••• tCSO tCSS tCL SCLK tCSW tCS1 tCH tCP tCSH ••• tDS tDH ••• DIN Figure 3. Detailed Serial Interface Timing Diagram of each SCLK pulse (Figure 2).
PAGE 9
Dual 256-Tap, Low-Drift, Digital Potentiometers in 10-µMAX B0 (A0) DATA WORD B1 (D7) B2 (D6) B3 (D5) B4 (D4) B5 (D3) B6 (D2) B7 (D1) B8 (D0) (MSB) (LSB) First Bit In Last Bit In Figure 4. Serial Data Format R3 WA VCC VOUT MAX5403 MAX5404 MAX5405 R1 R2 LA +5V WA V0 MAX5403 MAX5404 MAX5405 MAX4250 LA V0 / IS = R3 (1 + R2/R1) + R2 Figure 5. I to V Converter VCC Figure 6a. Adjustable Gain Circuit Using: 2-Terminal Variable Resistor VIN VOUT +5V VIN OUT VOREF WB HB VOREF = 12.
PAGE 10
Chip Information TRANSISTOR COUNT: 8689 PROCESS: BiCMOS Package Information e 10LUMAX.EPS MAX5403/MAX5404/MAX5405 Dual 256-Tap, Low-Drift, Digital Potentiometers in 10-µMAX 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 0.116 0.120 D2 0.114 0.118 E1 0.116 0.120 0.114 0.118 E2 0.187 0.199 H 0.0157 0.0275 L 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.