Rainbow Electronics MAX5484 User Manual

General Description

The MAX5481–MAX5484 10-bit (1024-tap) nonvolatile,
linear-taper, programmable voltage-dividers and vari­able resistors perform the function of a mechanical
potentiometer, but replace the mechanics with a pin­configurable 3-wire serial SPI™-compatible interface or
up/down digital interface. The MAX5481/MAX5482 are
3-terminal voltage-dividers and the MAX5483/MAX5484
are 2-terminal variable resistors.

The MAX5481–MAX5484 feature an internal, non­volatile, electrically erasable programmable read-only
memory (EEPROM) that stores the wiper position for ini­tialization during power-up. The 3-wire SPI-compatible
serial interface allows communication at data rates up
to 7MHz. A pin-selectable up/down digital interface is
also available.

The MAX5481–MAX5484 are ideal for applications
requiring digitally controlled potentiometers. Two end-to­end resistance values are available (10kΩ and 50kΩ) in a
voltage-divider or a variable-resistor configuration (see
the Selector Guide). The nominal resistor temperature
coefficient is 35ppm/°C end-to-end, and only 5ppm/°C
ratiometric, making these devices ideal for applications
requiring low-temperature-coefficient voltage-dividers,
such as low-drift, programmable gain-amplifiers.

The MAX5481–MAX5484 operate with either a +2.7V to
+5.25V single power supply or ±2.5V dual power sup­plies. These devices consume 400µA (max) of supply
current when writing data to the nonvolatile memory
and 1.0µA (max) of standby supply current. The
MAX5481–MAX5484 are available in a space-saving
(3mm x 3mm), 16-pin TQFN, or a 14-pin TSSOP pack­age and are specified over the extended (-40°C to
+85°C) temperature range.

Applications

Features

♦ 1024 Tap Positions

♦ Power-On Recall of Wiper Position from

Nonvolatile Memory

♦ 16-Pin (3mm x 3mm x 0.8mm) TQFN or 14-Pin

TSSOP Package

♦ 35ppm/°C End-to-End Resistance Temperature

Coefficient

♦ 5ppm/°C Ratiometric Temperature Coefficient
♦ 10kΩ and 50kΩ End-to-End Resistor Values

♦ Pin-Selectable SPI-Compatible Serial Interface or

Up/Down Digital Interface

♦ 1µA (max) Standby Current

♦ Single +2.7V to +5.25V Supply Operation

♦ Dual ±2.5V Supply Operation

MAX5481–MAX5484

10-Bit, Nonvolatile, Linear-Taper Digital

Potentiometers

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

16

15

14

13

V

SS

N.C.

V

DD

GND

9

101112

SPI/UD

DIN(U/D)

SCLK(INC)

CS

4321

N.C.

L

W

H

5

6

7

8

N.C.

N.C.

N.C.

V

SS

INTERFACE

TOP VIEW

TQFN

*SEE FUNCTIONAL DIAGRAM

16

15

14

13

V

SS

N.C.

V

DD

GND

9

101112

SPI/UD

DIN(U/D)

SCLK(INC)

CS

4321

N.C.

L

W

D.N.C.

5

6

7

8

N.C.

N.C.

N.C.

V

SS

MAX5483
MAX5484

INTERFACE

TQFN

MAX5481*
MAX5482*

Pin Configurations

19-3708; Rev 0; 5/05

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.

Selector Guide appears at end of data sheet.

SPI is a trademark of Motorola, Inc.

†

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

temperature range.

*Future product—contact factory for availability.

**EP = Exposed pad.

Ordering Information continued at end of data sheet.

Pin Configurations continued at end of data sheet.

Gain and Offset
Adjustment

LCD Contrast Adjustment

Pressure Sensors

Low-Drift Programmable
Gain Amplifiers

Mechanical Potentiometer
Replacement

PART

MAX5481ETE 16 TQFN-EP** T1633F-3 ACP

MAX5481EUD* 14 TSSOP — —

†

PIN-PACKAGE PKG CODE

TOP

MARK

MAX5481–MAX5484

10-Bit, Nonvolatile, Linear-Taper 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...........................................................-0.3V to +6.0V

V

SS

to GND............................................................-6.0V to +0.3V

V

DD

to VSS.............................................................-0.3V to +6.0V

H, L, W to V

SS

..................................(VSS- 0.3V) to (VDD+ 0.3V)

CS, SCLK(INC), DIN(U/D), SPI/UD to GND..-0.3V to (V

DD

+ 0.3V)

Maximum Continuous Current into H, L, and W

MAX5481/MAX5483.........................................................±5mA

MAX5482/MAX5484......................................................±1.0mA

Maximum Current into Any Other Pin ...............................±50mA

Continuous Power Dissipation (T

A

= +70°C)

16-Pin TQFN (derate 17.5mW/°C above +70°C) .....1398.6mW

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 .............................-60°C to +150°C

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

ELECTRICAL CHARACTERISTICS

(VDD= +2.7V to +5.25V, VSS= GND = 0, VH= VDD, VL= 0, TA= -40°C to +85°C, unless otherwise noted. Typical values are at V

DD

= +5.0V, TA= +25°C, unless otherwise noted.) (Note 1)

DC PERFORMANCE (MAX5481/MAX5482 programmable voltage-divider)

Resolution N 10 Bits

Integral Nonlinearity (Note 2) INL

Differential Nonlinearity (Note 2) DNL

End-to-End Resistance
Temperature Coefficient

Ratiometric Resistance
Temperature Coefficient

Full-Scale Error FSE

Zero-Scale Error ZSE

End-to-End Resistance R

Wiper Capacitance C

Resistance from W to L and H

DC PERFORMANCE (MAX5483/MAX5484 variable resistor)
Resolution N 10 Bits

Variable-Resistor Temperature
Coefficient

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

VDD = 2.7V ±2

V

= 5V ±2

DD

VDD = 2.7V ±1

V

= 5V ±1

DD

TC

R

MAX5481 -4 -2.5 0

MAX5482 -4 -0.75 0

MAX5481 0 +3.3 +5

MAX5482 0 +1.45 +5

H-L

TC

MAX5481 7.5 10 12.5

MAX5482 37.5 50 62.5

W

W at code = 15, H and L
shorted to V
resistance from W to H, Figures
1 and 2

VDD = 2.7V -1.6

VDD = 3V -4 -1.4 +4Integral Nonlinearity (Note 3) INL_R

= 5V -4 -1.3 +4

V

DD

VDD = 2.7V +0.45

VDD = 3V -1 +0.4 +1Differential Nonlinearity (Note 3) DNL_R

= 5V -1 +0.35 +1

V

DD

VDD = 3V to 5.25V; code = 128 to 1024 35 ppm/°C

VR

, measure

SS

MAX5481 6.3

MAX5482 25

35 ppm/°C

5 ppm/°C

60 pF

LSB

LSB

LSB

LSB

kΩ

kΩ

LSB

LSB

MAX5481–MAX5484

10-Bit, Nonvolatile, Linear-Taper Digital

Potentiometers

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VDD= +2.7V to +5.25V, VSS= GND = 0, VH= VDD, VL= 0, TA= -40°C to +85°C, unless otherwise noted. Typical values are at V

DD

= +5.0V, TA= +25°C, unless otherwise noted.) (Note 1)

Full-Scale Wiper-to-End
Resistance

Zero-Scale Resistor Error R

Wiper Resistance R
Wiper Capacitance C

DIGITAL INPUTS (CS, SCLK(INC), DIN(U/D), SPI/UD) (Note 5)

Input-High Voltage V

Input-Low Voltage V

Input Leakage Current I

Input Capacitance C

DYNAMIC CHARACTERISTICS

Wiper -3dB Bandwidth

Total Harmonic Distortion THD

NONVOLATILE MEMORY RELIABILITY

Data Retention TA = +85°C 50 Years

Endurance

POWER SUPPLY

Single-Supply Voltage V

Dual-Supply Voltage

Average Programming Current I

Peak Programming Current

Standby Current I

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

R

W-L

V

V

PG

DD

MAX5483 7.5 10 12.5 kΩ
MAX5484 37.5 50 62.5 kΩ

Code = 0

Z

VDD ≥ 3V (Note 4) 50 Ω

W

W

Single-supply operation

IH

Dual-supply operation

Single-supply operation

IL

Dual-supply operation

IN

IN

Wiper at code = 01111
01111, C

V

DD

code = 01111 01111,
1V

RMS

applied at H, 10pF
load on W

TA = +25°C 200,000

T

= +85°C 50,000

A

DD

DD

VSS = GND = 0 2.70 5.25 V

GND = 0 2.50 5.25

VDD - VSS ≤ 5.25V -2.5 -0.2

SS

During nonvolatile write; digital inputs =
V

DD

During nonvolatile write only; digital inputs
= V

Digital inputs = VDD or GND, TA = +25°C 0.6 1 µA

DD

= 10pF

LW

= 3V, wiper at

at 10kHz is

or GND

or GND

MAX5483 70
MAX5484 110

60 pF

VDD = +3.6V to
+5.25V

= +2.7V to

V

DD

+3.6V

V

= +2.5V, V

DD

= -2.5V

V

= +2.7V to

DD

+5.25V

V

= +2.5V, V

DD

= -2.5V

MAX5481 250

MAX5482 50

MAX5481 0.026

MAX5482 0.03

SS

SS

2.4

0.7 x
V

DD

2.0

5pF

220 400 µA

4mA

Ω

V

0.8

V

0.6

±1 µA

kHz

%

Stores

V

MAX5481–MAX5484

10-Bit, Nonvolatile, Linear-Taper Digital
Potentiometers

4 _______________________________________________________________________________________

TIMING CHARACTERISTICS

(VDD= +2.7V to +5.25V, VSS= GND = 0, VH= VDD, VL= 0, TA= -40°C to +85°C, unless otherwise noted. Typical values are at V

DD

= +5.0V, TA= +25°C, unless otherwise noted.) (Note 1)

Note 1: 100% production tested at TA= +25°C and TA= +85°C. Guaranteed by design to TA= -40°C.
Note 2: The DNL and INL are measured with the device configured as a voltage-divider with H = V

DD

and L = VSS. The wiper termi-

nal (W) is unloaded and measured with a high-input-impedance voltmeter.

Note 3: The DNL_R and INL_R are measured with D.N.C. unconnected and L = V

SS

= 0. For VDD= 5V, the wiper terminal is driven

with a source current of I

W

= 80µA for the 50kΩ device and 400µA for the 10kΩ device. For VDD= 3V, the wiper terminal is

driven with a source current of 40µA for the 50kΩ device and 200µA for the 10kΩ device.

Note 4: The wiper resistance is measured using the source currents given in Note 3.
Note 5: The device draws higher supply current when the digital inputs are driven with voltages between (V

DD

- 0.5V) and (GND +

0.5V). See Supply Current vs. Digital Input Voltage in the Typical Operating Characteristics.

Note 6: Wiper settling test condition uses the voltage-divider configuration with a 10pF load on W. Transition code from 00000 00000

to 01111 01111 and measure the time from CS going high to the wiper voltage settling to within 0.5% of its final value.

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

ANALOG SECTION

Wiper Settling Time (Note 6) t

SPI-COMPATIBLE SERIAL INTERFACE (Figure 3)

SCLK Frequency f

SCLK Clock Period t

SCLK Pulse-Width High t

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

DIN to SCLK Setup t

DIN Hold after SCLK t
SCLK Rise to CS Fall Delay t

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

Write NV Register Busy Time t

UP/DOWN DIGITAL INTERFACE (Figure 8)

CS to INC Setup t
INC High to U/D Change t
U/D to INC Setup t
INC Low Period t
INC High Period t
INC Inactive to CS Inactive t
CS Deselect Time (Store) t
INC Cycle Time t
INC Active to CS Inactive t

Wiper Store Cycle t

SCLK

CP

CH

CL

CSS

CSH

DS

DH

CS0

CS1

CSW

BUSY

CI

ID

DI

IH

IC

CPH

CYC

IK

WSC

MAX5481 5

S

MAX5482 22

IL

7 MHz

140 ns

60 ns

60 ns

60 ns

0ns

40 ns

0ns

15 ns

60 ns

150 ns

12 ms

25 ns

20 ns

25 ns

25 ns

25 ns

50 ns

50 ns

50 ns

50 ns

12 ms

µs

MAX5481–MAX5484

10-Bit, Nonvolatile, Linear-Taper Digital

Potentiometers

_______________________________________________________________________________________ 5

Typical Operating Characteristics

(VDD= 5.0V, VSS= 0, TA= +25°C, unless otherwise noted.)

DNL vs. CODE (MAX5483)

1.0

0.8

0.6

0.4

0.2

0

DNL (LSB)

-0.2

-0.4

-0.6

-0.8

-1.0
0 256 384128 512 640 768 896 1024

CODE

2.0

1.5

1.0

0.5

0

INL (LSB)

-0.5

-1.0

-1.5

-2.0

INL vs. CODE (MAX5483)

0 256 384128 512 640 768 896 1024

CODE

VDD = 2.7V

VDD = 3V

MAX5481 toc01

MAX5481 toc04

1.0

0.8

0.6

0.4

0.2

0

DNL (LSB)

-0.2

-0.4

-0.6

-0.8

-1.0
0 256 384128 512 640 768 896 1024

2.0

1.5

1.0

0.5

0

INL (LSB)

-0.5

-1.0

-1.5

-2.0
0 256 384128 512 640 768 896 1024

DNL vs. CODE (MAX5483)

VDD = 5V

CODE

INL vs. CODE (MAX5483)

VDD = 5V

CODE

MAX5481 toc02

MAX5481 toc05

2.0

1.5

1.0

0.5

0

INL (LSB)

-0.5

-1.0

-1.5

-2.0

INL vs. CODE (MAX5483)

0 256 384128 512 640 768 896 1024

CODE

DNL vs. CODE (MAX5481)

1.0

0.8

0.6

0.4

0.2

0

DNL (LSB)

-0.2

-0.4

-0.6

-0.8

-1.0
0 256 384128 512 640 768 896 1024

CODE

VDD = 2.7V

MAX5481 toc03

VDD = 2.7V

MAX5481 toc06

1.0

0.8

0.6

0.4

0.2

0

DNL (LSB)

-0.2

-0.4

-0.6

-0.8

-1.0
0 256 384128 512 640 768 896 1024

CODE

DNL vs. CODE (MAX5481)

VDD = 5V

MAX5481 toc07

1.0

INL vs. CODE (MAX5481)

0.8

0.6

0.4

0.2

0

INL (LSB)

-0.2

-0.4

-0.6

-0.8

-1.0
0 256 384128 512 640 768 896 1024

CODE

VDD = 2.7V

MAX5481 toc08

1.0

INL vs. CODE (MAX5481)

0.8

0.6

0.4

0.2

0

INL (LSB)

-0.2

-0.4

-0.6

-0.8

-1.0
0 256 384128 512 640 768 896 1024

CODE

VDD = 5V

MAX5481 toc09

MAX5481–MAX5484

10-Bit, Nonvolatile, Linear-Taper Digital
Potentiometers

6 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(VDD= 5.0V, VSS= 0, TA= +25°C, unless otherwise noted.)

1.0

0.8

0.6

0.4

0.2

0

DNL (LSB)

-0.2

-0.4

-0.6

-0.8

-1.0
0 256 384128 512 640 768 896 1024

CODE

VDD = 2.7V

MAX5481 toc10

DNL (LSB)

-0.2

-0.4

-0.6

-0.8

-1.0

DNL vs. CODE (MAX5484)

1.0

0.8

0.6

0.4

0.2

0

INL (LSB)

-0.2

-0.4

-0.6

-0.8

-1.0

INL vs. CODE (MAX5484)

VDD = 5V

0 256 384128 512 640 768 896 1024

CODE

MAX5481 toc13

DNL (LSB)

-0.2

-0.4

-0.6

-0.8

-1.0

1.0

0.8

0.6

0.4

0.2

0

0 256 384128 512 640 768 896 1024

CODE

VDD = 5V

DNL vs. CODE (MAX5482)

DNL vs. CODE (MAX5484)

1.0

0.8

0.6

0.4

0.2

0

0 256 384128 512 640 768 896 1024

CODE

VDD = 2.7V

MAX5481 toc11

MAX5481 toc14

1.0

0.8

0.6

0.4

0.2

0

INL (LSB)

-0.2

-0.4

-0.6

-0.8

-1.0
0 256 384128 512 640 768 896 1024

CODE

DNL vs. CODE (MAX5482)

1.0

0.8

0.6

0.4

0.2

0

DNL (LSB)

-0.2

-0.4

-0.6

-0.8

-1.0
0 256 384128 512 640 768 896 1024

CODE

INL vs. CODE (MAX5484)

VDD = 2.7V

MAX5481 toc12

VDD = 5V

MAX5481 toc15

1.0

INL vs. CODE (MAX5482)

0.8

0.6

0.4

0.2

0

INL (LSB)

-0.2

-0.4

-0.6

-0.8

-1.0
0 256 384128 512 640 768 896 1024

CODE

VDD = 2.7V

MAX5481 toc16

1.0

INL vs. CODE (MAX5482)

0.8

0.6

0.4

0.2

0

INL (LSB)

-0.2

-0.4

-0.6

-0.8

-1.0
0 256 384128 512 640 768 896 1024

CODE

VDD = 5V

MAX5481 toc17

(Ω)

W

R

WIPER RESISTANCE vs. CODE

(VARIABLE RESISTOR, T

80

70

60

50

40

30

20

10

0

0 256 384128 512 640 768 896 1024

CODE

= -40°C)

A

MAX5481 toc18

MAX5481–MAX5484

10-Bit, Nonvolatile, Linear-Taper Digital

Potentiometers

_______________________________________________________________________________________ 7

Typical Operating Characteristics (continued)

(VDD= 5.0V, VSS= 0, TA= +25°C, unless otherwise noted.)

WIPER RESISTANCE vs. CODE

(VARIABLE RESISTOR, T

80

70

60

50

(Ω)

40

W

R

30

20

10

0

0 256 384128 512 640 768 896 1024

CODE

= +25°C)

A

W-TO-L RESISTANCE vs. CODE

(MAX5483)

14

12

10

8

(kΩ)

WL

R

6

4

2

0

0 256 384128 512 640 768 896 1024

CODE

WIPER-TO-END RESISTANCE (RWL) % CHANGE

vs. TEMPERATURE (VARIABLE RESISTOR)

2.0

1.5

1.0

0.5

0

-0.5

-1.0

-1.5

WIPER-TO-END RESISTANCE CHANGE (%)

-2.0

-40 -15 10 35 60 85

CODE = 11 1111 1111

TEMPERATURE (°C)

MAX5481 toc19

MAX5481 toc22

MAX5481 toc25

(Ω)

W

R

22.0

21.5

21.0

20.5

(Ω)

20.0

W

R

19.5

19.0

18.5

18.0

(µA)

DD

I

WIPER RESISTANCE vs. CODE

(VARIABLE RESISTOR, T

80

70

60

50

40

30

20

10

0

0 256 384128 512 640 768 896 1024

WIPER RESISTANCE vs. WIPER VOLTAGE

012345

STANDBY SUPPLY CURRENT

1.5

1.2

0.9

0.6

0.3

0

-40 10-15 35 60 85

= +85°C)

A

CODE

(VARIABLE RESISTOR)

CODE = 00 0000

WIPER VOLTAGE (V)

vs. TEMPERATURE

VDD = 5.25V

TEMPERATURE (°C)

VDD = 5V

W-TO-L RESISTANCE vs. CODE

70

60

MAX5481 toc20

50

40

(kΩ)

WL

R

30

20

10

0

0 256 384128 512 640 768 896 1024

END-TO-END (RHL) % CHANGE

vs. TEMPERATURE (VOLTAGE-DIVIDER)

2.0

1.5

MAX5481 toc23

1.0

0.5

0

-0.5

-1.0

END-TO-END RESISTANCE CHANGE (%)

-1.5

-2.0

-40 -15 10 35 60 85

DIGITAL SUPPLY CURRENT

vs. DIGITAL INPUT VOLTAGE

10,000

MAX5481 toc26

1000

100

(µA)

DD

I

10

1

0.1
0 5.0

DIGITAL INPUT VOLTAGE (V)

(MAX5484)

CODE

TEMPERATURE (°C)

VDD = 5V

MAX5481 toc21

MAX5481 toc24

MAX5481 toc27

4.54.03.53.02.52.01.51.00.5