Rainbow Electronics MAX5439 User Manual

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 (VCC). The resistor string uses its
own analog supplies (VDDand VSS) that require
VDD- VSSto 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 VDD- VSSand VCC­VSSare met.

The MAX5437/MAX5439 include an on-chip, high­voltage, uncommitted amplifier, providing additional
reductions in board space and cost. Other features
include low 35ppm/°C end-to-end and 5ppm/°C ratio­metric 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 14­pin 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

Pin Configurations

Ordering Information

19-2657; Rev 0; 10/02

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.

SPI/QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

PART TEMP RANGE

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

PIN­PACKAGE

RESISTANCE

(kΩ)

TOP VIEW

SCLK

DIN

GND

V

1

1

2

3

4

5

MAX5436/
MAX5438

µMAX

CS

SS

10

9

8

7

6

SCLK

V

CC

2

DIN

L

3

CS

W

4

SHDN

H

V

GND

DD

V

OUT

MAX5437/

MAX5439

5

6

SS

7

14

13

12

11

10

9

8

V

L

W

H

V

IN+

IN-

CC

DD

TSSOP

MAX5436–MAX5439

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

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

VDDto GND, VSS= GND........................................-0.3V to +34V

V

SS

to GND, VDD= GND........................................-34V to +0.3V

V

DD

to VSS..............................................................-0.3V to +34V

V

DD

to VCC........................................................-6.3V to +28.75V

V

CC

to VSS..............................................................-0.3V to +34V

V

CC

to GND..............................................................-0.3V to +6V

DIN, SCLK, CS, SHDN ...............................-0.3V to (V

CC

+ 0.3V)

H, L, W, IN+, IN-, OUT .....................(V

SS

- 0.3V) to (VDD+ 0.3V)

Maximum Continuous Current into H, L, and W

MAX5436–MAX5439.......................................................±1mA

Continuous Power Dissipation (T

A

= +70°C)

10-Pin µMAX (derate 6.94mW/°C above +70°C) .........556mW

14-Pin TSSOP (derate 9.1mW/°C above +70°C) .........727mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

ELECTRICAL CHARACTERISTICS

(VDD= +15V, VSS= -15V, VCC= +5V, VH= VDD, VL= VSS, TA= -40°C to +85°C, unless otherwise noted. Typical values are at
T

A

= +25°C, unless otherwise noted.)

DC PERFORMANCE (Voltage-Divider Mode)

Resolution 2
Integral Nonlinearity INL (Note 1) ±1 LSB
Differential Nonlinearity DNL (Note 1) ±1 LSB

End-to-End Resistor Tempco TC

Ratiometric Resistor Tempco 5 ppm/°C

Full-Scale Error RHL = 50kΩ (MAX5436/MAX5438) -0.3 LSB

Zero-Scale Error RHL = 50kΩ (MAX5436/MAX5438) +0.3 LSB

Full-Scale Error RHL = 100kΩ (MAX5437/MAX5439) -0.15 LSB

Zero-Scale Error RHL = 100kΩ (MAX5437/MAX5439) +0.15 LSB

DC PERFORMANCE (Variable-Resistor Mode)

Resolution 2
Integral Nonlinearity INL (Note 2) ±1 LSB
Differential Nonlinearity DNL (Note 2) ±1 LSB

DC PERFORMANCE (Resistor Characteristics)

Wiper Resistance W

Wiper Capacitance W

End-to-End Resistance R

DIGITAL INPUTS

Input High Voltage V

Input Low Voltage V

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

N

R

N

(Note 3) 0.9 2 kΩ

R

Midscale 6 pF

C

MAX5437/MAX5439 75 100 125

HL

MAX5436/MAX5438 37.5 50 62.5

= 4.75V to 5.25V (Note 4) 2.4 V

CC

= 4.75V to 5.25V 0.8 V

CC

128 Taps

35 ppm/°C

128 Taps

kΩ

MAX5436–MAX5439

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

_______________________________________________________________________________________ 3

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
T

A

= +25°C, unless otherwise noted.)

Input High Voltage V

Input Low Voltage V
Input Leakage Current ±1.0 µA

Input Capacitance 5.0 pF

DYNAMIC CHARACTERISTICS (Analog)

Wiper -3dB Bandwidth BW

Wiper Settling Time t

AMPLIFIER CHARACTERISTICS (Analog)

Input Bias Current I

Input Offset Voltage V

Offset-Voltage Temperature Drift V

Input Offset Current I

Unity-Gain Bandwidth UBW

Slew Rate SR 0.25 V/µs

Large-Signal Voltage Gain A

Input Noise V

Input Compliance CMR

Output Compliance CMR

DC CMRR CMRR 68 dB

DC PSRR PSRR 70 dB

TIMING CHARACTERISTICS (Digital) (Note 5, Figure 3)

SCLK Clock Frequency f

SCLK Clock Period t

SCLK Pulse Width High t

SCLK Pulse Width Low t
CS Fall to SCLK Rise Setup Time t
SCLK Rise to CS Rise Hold Time t

DIN Setup Time t

DIN Hold Time t
SCLK Rise to CS Fall Delay t

CS Rise to SCLK Rise Hold t
CS Pulse Width High t

POWER SUPPLIES

Positive Analog Supply Voltage V

Negative Analog Supply Voltage V

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

= 2.7V to 3.6V 2.0 V

CC

= 2.7V to 3.6V 0.6 V

CC

W

IL

B

OS

OSD

OS

A

VO

N

I

OILOAD

CLK

CP

CH

CL

CSS

CSH

DS

DH

CSO

CS1

CSW

DD

SS

RHL = 50kΩ, midscale, VH = 1.5V

= 20pF, voltage-divider mode

C

WIPER

RHL = 100kΩ, midscale, VH = 1.5V

= 20pF, voltage-divider mode

C

WIPER

C

= 20pF, code 1 to code 127, settle

WIPER

to 0.5LSB

C

= 250pF 100 kHz

LOAD

R

LOAD

= 100kΩ, V

= ±14V 100 V/mV

OUT

f = 1kHz 110 nV/√Hz

= ±5mA VSS + 1 VDD - 1 V

P-P

P-P

,

,

400

kHz

200

5µs

15 nA
±6mV

10 µV/°C

2nA

VSS + 1 VDD - 2 V

0 10 MHz

100 ns

40 ns

40 ns

40 ns

10 ns

40 ns

0ns

10 ns

40 ns

100 ns

0 31.5 V

-28.8 0 V

MAX5436–MAX5439

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

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
T

A

= +25°C, unless otherwise noted.)

Note 1: The DNL and INL are measured with the potentiometer configured as a voltage-divider with H = VDDand L = VSS. The

wiper terminal is unloaded.

Note 2: The DNL and INL are measured with the potentiometer configured as a variable resistor. H is unconnected and L = V

SS

.

The wiper terminal is driven with a source current of 80µA for the 50kΩ configuration and 40µA for the 100kΩ configuration.

Note 3: The wiper resistance is measured assuming the source currents given in Note 2.
Note 4: Device draws current in excess of the specified supply current when a digital input is driven with a voltage of V

IN

< V

CC

-

0.6V or V

IN

> 0.5V. This is due to the CMOS input stage crowbar current. At VIN= 2.4V with VCC= 5.25V, this supply current

can be as high as 1.6mA.

Note 5: Guaranteed by design and characterization.

Analog Supply Separation V

Digital Supply Voltage V

Digital Supply to Negative Analog
Supply Separation

Power-On Reset Threshold POR 1.6 V

Digital Supply Current I

Positive Analog Supply Current I

Negative Analog Supply Current I

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

DS

CC

V

CS

CC

DD

SS

VDD - V

SS

VCC - V

SS

(Note 4) 30 50 µA

MAX5436/MAX5438

SHDN = GND for MAX5437/MAX5439
SHDN = V

MAX5436/MAX5438

SHDN = GND for MAX5437/MAX5439
SHDN = V

CC

CC

9.0 31.5 V

2.70 5.25 V

2.7 31.5 V

30 60

105 215

55 110

130 250

µA

µA