MAX5389MAUD+T - Maxim - Datasheet.Live

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MAX5389

Dual, 256-Tap, Volatile, Low-Voltage

Linear Taper Digital Potentiometer

19-5141; Rev 2; 11/10

General Description

The MAX5389 dual, 256-tap, volatile, low-voltage lin-

ear taper digital potentiometer offers three end-to-end

resistance values of 10kI, 50kI, and 100kI. Operating

from a single +2.6V to +5.5V power supply, the device

provides a low 35ppm/NC end-to-end temperature coef-

ficient. The MAX5389 features an up/down interface.

The small package size, low supply operating voltage,

low supply current, and automotive temperature range

of the MAX5389 make the device uniquely suited for the

portable consumer market, battery backup industrial

applications, and the automotive market.

The MAX5389 is specified over the automotive -40NC to

+125NC temperature range and is available in a 14-pin

TSSOP package.

Applications

Audio Mixing

Mechanical Potentiometer Replacement

Low-Drift Programmable Filters and Amplifiers

Adjustable Voltage References/Linear Regulators

Programmable Delays and Time Constants

Automotive Electronics

Low-Voltage Battery Applications

Features

S Dual, 256-Tap Linear Taper Positions

S Single +2.6V to +5.5V Supply Operation

S Low (< 1µA) Quiescent Supply Current

S 10kI, 50kI, 100kI End-to-End Resistance Values

S Up/Down Interface

S Power-On Sets Wiper to Midscale

S -40°C to +125NC Operating Temperature Range

Note: All devices are specified over the -40NC to +125NC oper-

ating temperature range

+Denotes a lead(Pb)-free/RoHS-compliant package.

Ordering Information

Functional Diagram

EVALUATION KIT

AVAILABLE

PART PIN-PACKAGE END-TO-END

RESISTANCE (kI)

MAX5389LAUD+ 14 TSSOP 10

MAX5389MAUD+ 14 TSSOP 50

MAX5389NAUD+ 14 TSSOP 100

U/D

LATCH 256 DECODER

256 DECODER

VDD HA

WA LA

POR

UDA

UDB

LATCH

GND

CSA

CSB

INCB

INCA

MAX5389

2 ______________________________________________________________________________________

MAX5389

Dual, 256-Tap, Volatile, Low-Voltage

Linear Taper Digital Potentiometer

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.

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

H_, W_, L_ to GND ......................................-0.3V to the lower of

(VDD + 0.3V) and +6V

All Other Pins to GND .............................................-0.3V to +6V

Continuous Current into H_, W_, and L_

MAX5389L ......................................................................... Q5mA

MAX5389M ........................................................................ Q2mA

MAX5389N ........................................................................ Q1mA

Continuous Power Dissipation (TA = +70NC)

14-Pin TSSOP (derate 10mW/NC above +70NC) ......796.8mW

Operating Temperature Range ........................ -40NC to +125NC

Junction Temperature .....................................................+150NC

Storage Temperature Range ............................ -65NC to +150NC

Lead Temperature (soldering, 10s) ................................+300NC

Soldering Temperature (reflow) ......................................+260NC

ELECTRICAL CHARACTERISTICS

(VDD = +2.6V to +5.5V, VH_ = VDD, VL_ = 0, TA = -40NC to +125NC, unless otherwise noted. Typical values are at VDD = +5V,

TA = +25NC.) (Note 1)

ABSOLUTE MAXIMUM RATINGS

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Resolution N 256 Taps

DC PERFORMANCE (Voltage-Divider Mode)

Integral Nonlinearity INL (Note 2) -0.5 +0.5 LSB

Differential Nonlinearity DNL (Note 2) -0.5 +0.5 LSB

Dual Code Matching Register A = register B -0.5 +0.5 LSB

Ratiometric Resistor Tempco (DVW/VW)/DT, no load +5 LSB

Full-Scale Error Code = FFH

MAX5389L -3 -2.5

LSBMAX5389M -1 -0.5

MAX5389N -0.5 -0.25

Zero-Scale Error Code = 00H

MAX5389L +2.5 +3

LSBMAX5389M +0.5 +1.0

MAX5389N +0.25 +0.5

DC PERFORMANCE (Variable-Resistor Mode) (Note 3)

Integral Nonlinearity R-INL

VDD > +2.6V

MAX5389L ±1.0 ±2.5

LSB

MAX5389M ±0.5 ±1.0

MAX5389N ±0.25 ±0.8

VDD > +4.75V

MAX5389L ±0.4 ±1.5

MAX5389M ±0.3 ±0.75

MAX5389N ±0.25 ±0.5

Differential Nonlinearity R-DNL VDD ≥ 2.6V -0.5 +0.5 LSB

DC PERFORMANCE (Resistor Characteristics)

Wiper Resistance (Note 4) RWL VDD > 2.6V 250 600 I

VDD > 4.75V 150 200

Terminal Capacitance CH_, CL_ Measured to GND 10 pF

Wiper Capacitance CW_ Measured to GND 50 pF

End-to-End Resistor Tempco TCRNo load 35 ppm/NC

End-to-End Resistor Tolerance DRHL Wiper not connected -25 +25 %

_______________________________________________________________________________________ 3

MAX5389

Dual, 256-Tap, Volatile, Low-Voltage

Linear Taper Digital Potentiometer

ELECTRICAL CHARACTERISTICS (continued)

(VDD = +2.6V to +5.5V, VH_ = VDD, VL_ = 0, TA = -40NC to +125NC, unless otherwise noted. Typical values are at VDD = +5V,

TA = +25NC.) (Note 1)

Note 1: All devices are 100% production tested at TA = +25NC. Specifications over temperature limits are guaranteed by design

and characterization.

Note 2: DNL and INL are measured with the potentiometer configured as a voltage-divider (Figure 1) with H_ = VDD and L_ = GND.

The wiper terminal is unloaded and measured with a high-input-impedance voltmeter.

Note 3: R-DNL and R-INL are measured with the potentiometer configured as a variable resistor (Figure 1). DNL and INL are mea-

sured with potentiometer configured as a variable resistor. H_ is unconnected and L_ = GND. For VDD = +5V, the wiper

terminal is driven with a source current of 400µA for the 10kω configuration, 80µA for the 50kω configuration, and 40µA for

the 100kω configuration. For VDD = +2.6V, the wiper terminal is driven with a source current of 200µA for the 10kω configu-

ration, 40µA for the 50kω configuration, and 20µA for the 100kω configuration.

Note 4: The wiper resistance is the worst value measured by injecting the currents given in Note 3 into W_ with L_ = GND. RW =

(VW - VH)/IW.

Note 5: Drive HA with a 1kHz, GND to VDD amplitude, tone. LA = LB = GND. No load. WB is at midscale with a 10pF load. Measure

WB.

Note 6: The wiper-settling time is the worst case 0 to 50% rise time, measured between tap 0 and tap 127. H_ = VDD, L_ = GND,

and the wiper terminal is loaded with 10pF capacitance to ground.

Note 7: Digital timing is guaranteed by design and characterization, not production tested.

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

AC PERFORMANCE

Crosstalk (Note 5) -90 dB

-3dB Bandwidth BW Code = 80H, 10pF load,

VDD = +2.6V

MAX5389L 600

kHzMAX5389M 150

MAX5389N 75

Total Harmonic Distortion Plus

Noise THD+N Measured at W, VH_ = 1VRMS at 1kHz 0.015 %

Wiper Settling Time (Note 6) tS

MAX5389L 300

nsMAX5389M 1000

MAX5389N 2000

POWER SUPPLIES

Supply Voltage Range VDD 2.6 5.5 V

Standby Current Digital inputs = VDD or GND 1 FA

DIGITAL INPUTS

Minimum Input High Voltage VIH 70 % x VDD

Maximum Input Low Voltage VIL 30 % x VDD

Input Leakage Current -1 +1 FA

Input Capacitance 5 pF

TIMING CHARACTERISTICS (Note 7)

Maximum INC_ Frequency fMAX 10 MHz

CS to INC_ Setup Time tCI 25 ns

CS to INC_ Hold Time tIC 0 ns

INC_ Low Period tIL 25 ns

INC_ High Period tIH 25 ns

UD_ to INC_ Setup Time tDI 50 ns

UD_ to INC_ Hold Time tID 0 ns

4 ______________________________________________________________________________________

MAX5389

Dual, 256-Tap, Volatile, Low-Voltage

Linear Taper Digital Potentiometer

Typical Operating Characteristics

(VDD = +5V, TA = +25°C, unless otherwise noted.)

Figure 1. Voltage-Divider and Variable Resistor Configurations

W W

N.C.

SUPPLY CURRENT

vs. TEMPERATURE

MAX5389 toc01

SUPPLY CURRENT (µA)

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

TEMPERATURE (°C)

1109565 80-10 5 20 35 50-25-40 125

VDD = 5V

VDD = 2.6V

SUPPLY CURRENT

vs. DIGITAL INPUT VOLTAGE

DIGITAL INPUT VOLTAGE (V)

SUPPLY CURRENT (µA)

0.5 3.0 5.04.54.01.5 2.52.01.0 3.5

1000

100

10,000

0.1

MAX5389 toc02

VDD = 2.6V

VDD = 5V

SUPPLY CURRENT

vs. SUPPLY VOLTAGE

MAX5389 toc03

VDD (V)

IDD (µA)

5.14.64.13.63.12.6

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

RESISTANCE (W-TO-L)

vs. TAP POSITION (10kI)

TAP POSITION

W-TO-L RESISTANCE (kΩ)

25520415351 102

MAX5389 toc04

RESISTANCE (W-TO-L)

vs. TAP POSITION (50kI)

TAP POSITION

W-TO-L RESISTANCE (kΩ)

25520415351 102

MAX5389 toc05

RESISTANCE (W-TO-L)

vs. TAP POSITION (100kI)

MAX5389 toc06

TAP POSITION

RESISTANCE (W-TO-L) (kI)

20415310251

100

110

0 255

_______________________________________________________________________________________ 5

MAX5389

Dual, 256-Tap, Volatile, Low-Voltage

Linear Taper Digital Potentiometer

Typical Operating Characteristics (continued)

(VDD = +5V, TA = +25°C, unless otherwise noted.)

WIPER RESISTANCE

vs. WIPER VOLTAGE (10kI)

WIPER VOLTAGE (V)

WIPER RESISTANCE (Ω)

0.5 3.0 5.04.54.01.5 2.52.01.0 3.5

110

150

130

190

170

210

MAX5389 toc07

VDD = 2.6V

VDD = 5V

END-TO-END RESISTANCE % CHANGE

vs. TEMPERATURE

MAX5389 toc08

TEMPERATURE (NC)

END-TO-END RESISTANCE % CHANGE

1109580655035205-10-25

-0.4

-0.3

-0.2

-0.1

0.1

-0.5

-40 125

10kI

50kI

100kI

VARIABLE-RESISTOR DNL

vs. TAP POSITION (10kI)

MAX5389 toc09

TAP POSITION

DNL (LSB)

20415310251

-0.08

-0.06

-0.04

-0.02

0.02

0.04

0.06

0.08

0.10

-0.10

0 255

IWIPER = 400µA

VARIABLE-RESISTOR DNL

vs. TAP POSITION (50kI)

MAX5389 toc10

TAP POSITION

DNL (LSB)

20415310251

-0.08

-0.06

-0.04

-0.02

0.02

0.04

0.06

0.08

0.10

-0.10

0 255

IWIPER = 80µA

VARIABLE-RESISTOR DNL

vs. TAP POSITION (100kI)

MAX5389 toc11

TAP POSITION

DNL (LSB)

20415310251

-0.08

-0.06

-0.04

-0.02

0.02

0.04

0.06

0.08

0.10

-0.10

0 255

IWIPER = 400µA

VARIABLE-RESISTOR INL

vs. TAP POSITION (10kI)

MAX5389 toc12

TAP POSITION

INL (LSB)

20415310251

-0.8

-0.6

-0.4

-0.2

0.2

0.4

0.6

0.8

1.0

-1.0

0 255

IWIPER = 400µA

VARIABLE-RESISTOR INL

vs. TAP POSITION (50kI)

MAX5389 toc13

TAP POSITION

INL (LSB)

20415310251

-0.4

-0.3

-0.2

-0.1

0.1

0.2

0.3

0.4

0.5

-0.5

0 255

IWIPER = 80µA

VARIABLE-RESISTOR INL

vs. TAP POSITION (100kI)

MAX5389 toc14

TAP POSITION

INL (LSB)

20415310251

-0.4

-0.3

-0.2

-0.1

0.1

0.2

0.3

0.4

0.5

-0.5

0 255

IWIPER = 400µA

VOLTAGE-DIVIDER DNL

vs. TAP POSITION (10kI)

MAX5389 toc15

TAP POSITION

DNL (LSB)

20415310251

-0.08

-0.06

-0.04

-0.02

0.02

0.04

0.06

0.08

0.10

-0.10

0 255

6 ______________________________________________________________________________________

MAX5389

Dual, 256-Tap, Volatile, Low-Voltage

Linear Taper Digital Potentiometer

Typical Operating Characteristics (continued)

(VDD = +5V, TA = +25°C, unless otherwise noted.)

VOLTAGE-DIVIDER DNL

vs. TAP POSITION (50kI)

MAX5389 toc16

TAP POSITION

DNL (LSB)

20415310251

-0.08

-0.06

-0.04

-0.02

0.02

0.04

0.06

0.08

0.10

-0.10

0 255

VOLTAGE-DIVIDER DNL

vs. TAP POSITION (100kI)

MAX5389 toc17

TAP POSITION

DNL (LSB)

20415310251

-0.08

-0.06

-0.04

-0.02

0.02

0.04

0.06

0.08

0.10

-0.10

0 255

VOLTAGE-DIVIDER INL

vs. TAP POSITION (10kI)

MAX5389 toc18

TAP POSITION

INL (LSB)

20415310251

-0.4

-0.3

-0.2

-0.1

0.1

0.2

0.3

0.4

0.5

-0.5

0 255

VOLTAGE-DIVIDER INL

vs. TAP POSITION (50kI)

MAX5389 toc19

TAP POSITION

INL (LSB)

20415310251

-0.4

-0.3

-0.2

-0.1

0.1

0.2

0.3

0.4

0.5

-0.5

0 255

VOLTAGE-DIVIDER INL

vs. TAP POSITION (100kI)

MAX5389 toc20

TAP POSITION

INL (LSB)

20415310251

-0.4

-0.3

-0.2

-0.1

0.1

0.2

0.3

0.4

0.5

-0.5

0 255

TAP-TO-TAP SWITCHING TRANSIENT

(CODE 127 TO 128) 10kI

400ns/div

INC

5V/div

VW-L

20mV/div

MAX5389 toc21

_______________________________________________________________________________________ 7

MAX5389

Dual, 256-Tap, Volatile, Low-Voltage

Linear Taper Digital Potentiometer

Typical Operating Characteristics (continued)

(VDD = +5V, TA = +25°C, unless otherwise noted.)

TAP-TO-TAP SWITCHING TRANSIENT

(CODE 127 TO 128) 50kI

400ns/div

INC

5V/div

VW-L

20mV/div

MAX5389 toc22

TAP-TO-TAP SWITCHING TRANSIENT

(CODE 127 TO 128) 100kI

1µs/div

VW-L

20mV/div

MAX5389 toc23

INC

5V/div

POWER-ON WIPER TRANSIENT

(CODE 0 TO 128)

2µs/div

VDD

2V/div

OUTPUT W

2V/div

MAX5389 toc24

MIDSCALE FREQUENCY RESPONSE

MAX5389 toc25

FREQUENCY (kHz)

GAIN (dB)

1,0001001010.1

-20

-10

-30

0.01 10,000

VIN = 1VP-P

CW = 10pF

MAX5389L

MAX5389M

MAX5389N

CROSSTALK vs. FREQUENCY

MAX5389 toc26

FREQUENCY (kHz)

CROSSTALK (dB)

1001010.1

-120

-100

-80

-60

-40

-20

-140

0.01 1000

MAX5389L

MAX5389M

MAX5389N

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. FREQUENCY

MAX5389 toc27

FREQUENCY (kHz)

THD+N (%)

1010.10

0.02

0.04

0.06

0.08

0.10

0.12

0.14

0.01 100

MAX5389L

MAX5389M

MAX5389N

8 ______________________________________________________________________________________

MAX5389

Dual, 256-Tap, Volatile, Low-Voltage

Linear Taper Digital Potentiometer

Pin Description

Pin Configuration

INCB

GNDVDD

CSB

INCAUDA

UDB

CSA

TOP VIEW

LBLA

5 10 WBWA

HA 6

MAX5389

PIN NAME FUNCTION

1CSA Active-Low Register A Chip-Select Input. Drive CSA low to change wiper position WA through INCA and UDA.

2 UDA Register A Up/Down Control Input. With UDA low, a high-to-low transition at INCA decrements the WA posi-

tion towards LA. With UDA high, a high-to-low transition at INCA increments WA position toward HA.

3 UDB Register B Up/Down Control Input. With UDB low, a high-to-low transition at INCB decrements the WB posi-

tion towards LB. With UDB high, a high-to-low transition at INCB increments WB position toward HB.

4 VDD Power-Supply Input. Bypass VDD to GND with a 0.1FF capacitor close to the device.

5 WA Resistor A Wiper Terminal

6 HA Resistor A High Terminal. The voltage at HA can be higher or lower than the voltage at LA. Current can flow

into or out of HA.

7 LA Resistor A Low Terminal. The voltage at LA can be higher or lower than the voltage at HA. Current can flow

into or out of LA.

8 LB Resistor B Low Terminal. The voltage at LB can be higher or lower than the voltage at HB. Current can flow

into or out of LB.

9 HB Resistor B High Terminal. The voltage at HB can be higher or lower than the voltage at LB. Current can flow

into or out of HB.

10 WB Resistor B Wiper Terminal

11 GND Ground

12 INCB Register B Wiper Increment Control Input. With UDB low, a high-to-low transition at INCB decrements the

WB position towards LB. With UDB high, a high-to-low transition at INCB increments WB position toward HB.

13 INCA Register A Wiper Increment Control Input. With UDA low, a high-to-low transition at INCA decrements the

WA position towards LA. With UDA high, a high-to-low transition at INCA increments WA position toward HA.

14 CSB Active-Low Register B Chip-Select Input. Drive CSB low to change wiper position WA through INCB and UDB.

_______________________________________________________________________________________ 9

MAX5389

Dual, 256-Tap, Volatile, Low-Voltage

Linear Taper Digital Potentiometer

Detailed Description

The MAX5389 dual, 256-tap, volatile, low-voltage linear

taper digital potentiometer offers three end-to-end resis-

tance values of 10kI, 50kI, and 100kI. The potenti-

ometer consists of 255 fixed resistors in series between

terminals H_ and L_. The potentiometer wiper, W_, is

programmable to access any one of the 256 tap points

on the resistor string. On power-up, the wiper position is

set to midscale (tap 128).

The potentiometers are programmable independent of

each other. The MAX5389 features an up/down interface.

Up/Down Interface

Logic inputs CS_, UD_, and INC_ determine the wiper

position of the device (Table 1). With CS_ low and UD_

high, a high-to-low (falling edge) transition on INC_

increments the internal counter which moves the wiper,

W_, closer to H_. When both CS_ and UD_ are low, the

falling edge of INC_ decrements the internal counter

and moves the tap point, W_ closer to L_, (Figure 2). The

wiper performs a make-before-break transition ensuring

that W_ is never disconnected from the resistor string

during a transition from one tap point to another. When

the wiper is at either end of the resistor array additional

transitions in the direction of the end point do not change

the counter value.

Figure 2. Up/Down Interface Timing Diagram

X = Don’t care.

↑ = Low-to-high transition.

↓ = High-to-low transition.

Table 1. Up/Down Control Table

CS_ UD_ INC_ W_

H X X No change

L L áNo change

L H áNo change

L L âDecrement

L H âIncrement

UD_

INC_

CS_

tCI

tDI

tID

tIW

tIC

tIL

tIH

10 _____________________________________________________________________________________

MAX5389

Dual, 256-Tap, Volatile, Low-Voltage

Linear Taper Digital Potentiometer

Figure 3. Variable Gain Noninverting Amplifier

Figure 4. Variable Gain Inverting Amplifier

Figure 5. Adjustable Dual Linear Regulator

Applications Information

Variable Gain Amplifier

Figure 3 shows a potentiometer adjusting the gain of a

noninverting amplifier. Figure 4 shows a potentiometer

adjusting the gain of an inverting amplifier.

Adjustable Dual Linear Regulator

Figure 5 shows an adjustable dual linear regulator using

a dual potentiometer as two variable resistors.

Adjustable Voltage Reference

Figure 6 shows an adjustable voltage reference circuit

using a potentiometer as a voltage-divider.

Figure 6. Adjustable Voltage Reference

VIN

VOUT

VIN

VOUT

VOUT1

VOUT2

OUT1

OUT2

SET1

SET2

V+

MAX8866

OUT

+5V

VREF

GND L

MAX6160

______________________________________________________________________________________ 11

MAX5389

Dual, 256-Tap, Volatile, Low-Voltage

Linear Taper Digital Potentiometer

Variable Gain Current to Voltage Converter

Figure 7 shows a variable gain current to voltage con-

verter using a potentiometer as a variable resistor.

LCD Bias Control

Figure 8 shows a positive LCD bias control circuit using

a potentiometer as a voltage-divider.

Figure 9 shows a positive LCD bias control circuit using

a potentiometer as a variable resistor

Programmable Filter

Figure 10 shows a programmable filter using a dual

potentiometer.

Offset Voltage Adjustment Circuit

Figure 11 shows an offset voltage adjustment circuit

using a dual potentiometer.

Figure 7. Variable Gain I-to-V Converter

Figure 8. Positive LCD Bias Control Using a Voltage-Divide

Figure 9. Positive LCD Bias Control Using a Variable Resistor

Figure 10. Programmable Filter

VOUT

VOUT = -IS x ((R3 x (1 + R2/R1)) + R2)

VOUT

+5V

VOUT

+5V

VOUT

VIN

12 _____________________________________________________________________________________

MAX5389

Dual, 256-Tap, Volatile, Low-Voltage

Linear Taper Digital Potentiometer

Package Information

For the latest package outline information and land pat-

terns, go to www.maxim-ic.com/packages. Note that

a “+”, “#”, or “-” in the package code indicates RoHS

status only. Package drawings may show a different suf-

fix character, but the drawing pertains to the package

regardless of RoHS status.

Process Information

PROCESS: BiCMOS

Figure 11. Offset Voltage Adjustment Circuit

PACKAGE

TYPE

PACKAGE

CODE

OUTLINE

NO.

LAND

PATTERN NO.

14 TSSOP U14+1 21-0066 90-0113

VOUT

+5V

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.

Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 13

MAX5389

Dual, 256-Tap, Volatile, Low-Voltage

Linear Taper Digital Potentiometer

Revision History

REVISION

NUMBER

REVISION

DATE DESCRIPTION PAGES

CHANGED

0 1/10 Initial release —

1 4/10

Added Soldering Temperature in Absolute Maximum Ratings; cor-

rected code in Conditions of -3dB Bandwidth specification in Electrical

Characteristics; corrected Table 1 and Figure 5

2, 3, 9, 10

2 11/10 Updated Electrical Characteristics table globals, updated drawings for

optimal circuit operation 2, 3, 10, 11, 12