Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsData collecting ICsData acquisition IC - Digital potentiometer linear Non-permanent TSSOP 14

General Description

The MAX5436–MAX5439 are 128-tap high-voltage (±5V

to ±15V) digital potentiometers in packages that are half

the size of comparable devices in 8-pin SO. They perform

the same function as mechanical potentiometers, but

replace the mechanics with a simple digital interface. The

digital logic is powered by a separate single +2.7V to

+5.25V supply voltage (V

). The resistor string uses its

own analog supplies (V

and V

) that require

- V

to be greater than 9V and less than 31.5V. This

allows for greater flexibility in voltage ranges that can be

used with these devices. Examples of analog supply

ranges include not only dual voltages of ±5V to ±15V, but

single-supply voltages, such as +10V, +15V, +30V, -30V,

and more, as long as the ranges of V

- V

and V

are met.

The MAX5437/MAX5439 include an on-chip, high-

voltage, uncommitted amplifier, providing additional

reductions in board space and cost. Other features

include low 35ppm/°C end-to-end and 5ppm/°C ratio-

metric resistor temperature coefficients, a 3-wire SPI™/

QSPI™/MICROWIRE™-compatible serial interface, and

a power-on reset to midscale.

The MAX5436/MAX5438 are available in 10-pin µMAX

packages. The MAX5437/MAX5439 are available in 14-

pin TSSOP package. Each device is guaranteed over

the extended temperature range of -40°C to +85°C.

Applications

LCD Screen Contrast Adjustment

Data-Acquisition Systems

Mechanical Potentiometer Replacement

Low-Drift Programmable Gain Amplifier

Audio Volume Control

Features

♦ +10V to +30V Single-Supply Operation

♦ -28V to -10V Single Negative Supply Operation

♦ ±5V to ±15V Dual-Supply Operation

♦ 128 Tap Positions

♦ Uncommitted High-Voltage Amplifier

(MAX5437/MAX5439)

♦ Low Temperature Coefficient

35ppm/°C (End-to-End)

5ppm/°C (Ratiometric)

♦ Small-Footprint Packages

10-Pin µMAX (MAX5436/MAX5438)

14-Pin TSSOP (MAX5437/MAX5439)

♦ Glitchless Switching Between the Resistor Taps

♦ 3-Wire SPI/QSPI/MICROWIRE-Compatible Serial

Interface

♦ 50kΩ/100kΩ End-to-End Resistances

♦ Power-On Reset: Wiper Goes to Midscale

(Position 64)

MAX5436–MAX5439

±15V, 128-Tap, Low-Drift Digital Potentiometers

________________________________________________________________ Maxim Integrated Products 1

MAX5436

MAX5438

μMAX

TOP VIEW

MAX5437

MAX5439

TSSOP

GND

DIN

SCLK

SHDN

DIN

SCLK

IN+

IN-

OUT

GND

Pin Configurations

Ordering Information

19-2657; Rev 3; 9/04

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.

PART TEMP RANGE

PIN-

PACKAGE

RESISTANCE

(kΩ)

MAX5436EUB -40°C to +85°C 10 µMAX 50

MAX5437EUD -40°C to +85°C 14 TSSOP 50

MAX5438EUB -40°C to +85°C 10 µMAX 100

MAX5439EUD -40°C to +85°C 14 TSSOP 100

SPI/QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

Summary of content (11 pages)

PAGE 1
9-2657; Rev 3; 9/04 ±15V, 128-Tap, Low-Drift Digital Potentiometers The MAX5436–MAX5439 are 128-tap high-voltage (±5V to ±15V) digital potentiometers in packages that are half the size of comparable devices in 8-pin SO. They perform the same function as mechanical potentiometers, but replace the mechanics with a simple digital interface. The digital logic is powered by a separate single +2.7V to +5.25V supply voltage (VCC).
PAGE 2
MAX5436–MAX5439 ±15V, 128-Tap, Low-Drift Digital Potentiometers ABSOLUTE MAXIMUM RATINGS VDD to GND, VSS = GND........................................-0.3V to +34V VSS to GND, VDD = GND........................................-34V to +0.3V VDD to VSS ..............................................................-0.3V to +34V VDD to VCC ........................................................-6.3V to +28.75V VCC to VSS ..............................................................-0.3V to +34V VCC to GND ...
PAGE 3
±15V, 128-Tap, Low-Drift Digital Potentiometers (VDD = +15V, VSS = -15V, VCC = +5V, VH = VDD, VL = VSS, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS Input High Voltage VCC = 2.7V to 3.6V Input Low Voltage VCC = 2.7V to 3.6V MIN TYP MAX UNITS 0.6 V ±1.0 µA 2.0 V Input Leakage Current Input Capacitance 5.
PAGE 4
ELECTRICAL CHARACTERISTICS (continued) (VDD = +15V, VSS = -15V, VCC = +5V, VH = VDD, VL = VSS, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C, unless otherwise noted.
PAGE 5
±15V, 128-Tap, Low-Drift Digital Potentiometers 80 RESISTANCE (kΩ) 0.05 50kΩ -0.05 -0.10 70 60 50 50kΩ 40 30 100kΩ -0.15 100kΩ 20 -0.20 40 MAX5436 toc06 90 35 DIGITAL SUPPLY CURRENT (μA) 0.10 MAX5436 toc05 100 MAX5436 toc04 30 25 20 15 10 0 -40 -15 10 35 60 10 0 85 16 32 48 64 80 112 128 96 -40 -15 10 INPUT CODE TEMPERATURE (°C) MIDSCALE SWITCHING TRANSIENT (CODE 63 TO CODE 64) VARIABLE-RESISTOR DNL vs. INPUT CODE (50kΩ) MAX5436 toc07 0.10 CONDITIONS OF NOTE 2 0.
PAGE 6
Typical Operating Characteristics (continued) (VDD = +15V, VSS = -15V, VCC = +5V, VH = VDD, VL = VSS, TA = +25°C, unless otherwise noted.) VOLTAGE-DIVIDER DNL vs. INPUT CODE (100kΩ) 0.03 0.04 0.03 0.02 0.01 0.01 -0.002 INL (LSB) 0.02 0.002 INL (LSB) 0.004 0 0 0 -0.01 -0.01 -0.004 -0.02 -0.02 -0.006 -0.03 -0.03 -0.008 -0.04 -0.04 -0.010 -0.05 16 32 48 64 80 96 -0.
PAGE 7
±15V, 128-Tap, Low-Drift Digital Potentiometers PIN MAX5436/ MAX5438 1 MAX5437/ MAX5439 1 NAME DESCRIPTION SCLK Serial Clock Input 2 2 DIN Serial Data Input Chip Select 3 3 CS — 4 SHDN Amplifier Shutdown 4 5 GND Analog and Digital Ground 5 6 VSS Negative Analog Supply. Bypass with a 0.1µF capacitor to GND. — 7 OUT Amplifier Output — 8 IN- — 9 IN+ Amplifier Positive Input 6 10 VDD Positive Analog Supply. Bypass with a 0.1µF capacitor to GND.
PAGE 8
MAX5436–MAX5439 ±15V, 128-Tap, Low-Drift Digital Potentiometers DATA WORD D7 D6 Don’t Care (MSB) D5 D4 D3 D2 D1 D0 (LSB) First Bit Loaded Last Bit Loaded Figure 1. Serial Data Format WIPER POSITION UPDATED CS SCLK MSB LOADED DIN D7 D6 LAST BIT LOADED D5 D4 D3 D2 D1 MSB D0 LSB TIME Figure 2. Serial Interface Timing Diagram CS tCSW tCS1 tCSS tCSO tCL tCH tCP tCSH SCLK tDS tDH DIN Figure 3.
PAGE 9
±15V, 128-Tap, Low-Drift Digital Potentiometers MAX5436–MAX5439 +15V VS VO MAX427 -15V L R2 H MAX5436– MAX5439 R1 W VO/VS = 1 + R2/R1 Figure 4. Noninverting Amplifier VBATT DC/DC CONVERTER (SIMPLIFIED) VOUT (LCD BIAS) CONTROL FIXED ±28V IN LCD PANEL MAX5436– MAX5439 MAX629 ±16V TO ±26V CONTRAST ADJUST MICROCONTROLLER/MICROPROCESSOR Figure 5a.
PAGE 10
MAX5436–MAX5439 ±15V, 128-Tap, Low-Drift Digital Potentiometers Functional Diagrams VCC VCC R 7 DIN SCLK CS 7-BIT SHIFT REGISTER CLOCK LOGIC H R 7-BIT LATCH R 7 DECODE 128 L POR MAX5436/ MAX5438 7 W VDD VSS DIN 7 DECODE 128 SCLK CLOCK LOGIC W L MAX5437/ MAX5439 CS GND 7-BIT SHIFT REGISTER H R 7-BIT LATCH VDD VSS POR GND OUT IN+ IN- SHDN Chip Information TRANSISTOR COUNT: 2556 PROCESS: BiCMOS 10 ___________________________________________________________________________
PAGE 11
±15V, 128-Tap, Low-Drift Digital Potentiometers 10LUMAX.EPS e 4X S 10 10 H Ø0.50±0.1 0.6±0.1 1 1 0.6±0.1 BOTTOM VIEW TOP VIEW D2 MILLIMETERS INCHES MAX DIM MIN 0.043 A 0.006 A1 0.002 A2 0.030 0.037 0.120 D1 0.116 0.118 D2 0.114 0.120 E1 0.116 0.118 E2 0.114 0.199 H 0.187 L 0.0157 0.0275 L1 0.037 REF 0.0106 b 0.007 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 3.00 2.89 3.05 2.95 2.89 3.00 4.75 5.05 0.40 0.70 0.940 REF 0.270 0.177 0.500 BSC 0.