Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsData collecting ICsData acquisition IC - Digital potentiometer linear Permanent TQFN 16

General Description

The MAX5487/MAX5488/MAX5489 dual, linear-taper,

digital potentiometers function as mechanical poten-

tiometers with a simple 3-wire SPI™-compatible digital

interface that programs the wipers to any one of 256

tap positions. These digital potentiometers feature a

nonvolatile memory (EEPROM) to return the wipers to

their previously stored positions upon power-up.

The MAX5487 has an end-to-end resistance of 10kΩ,

while the MAX5488 and MAX5489 have resistances of

50kΩ and 100kΩ, respectively. These devices have a

low 35ppm/°C end-to-end temperature coefficient, and

operate from a single +2.7V to +5.25V supply.

The MAX5487/MAX5488/MAX5489 are available in

16-pin 3mm x 3mm x 0.8mm TQFN or 14-pin TSSOP

packages. Each device is guaranteed over the extended

-40°C to +85°C temperature range.

Applications

LCD Screen Adjustment

Audio Volume Control

Mechanical Potentiometer Replacement

Low-Drift Programmable Filters

Low-Drift Programmable-Gain Amplifiers

Features

o Wiper Position Stored in Nonvolatile Memory

(EEPROM) and Recalled Upon Power-Up or

Recalled by an Interface Command

o 3mm x 3mm x 0.8mm, 16-Pin TQFN or 14-Pin

TSSOP Packages

o ±1 LSB INL, ±0.5 LSB DNL (Voltage-Divider Mode)

o 256 Tap Positions

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

Coefficient

o 5ppm/°C Ratiometric Temperature Coefficient

o 10kΩ, 50kΩ, and 100kΩ End-to-End Resistance

Values

o SPI-Compatible Serial Interface

o Reliability

200,000 Wiper Store Cycles

50-Year Wiper Data Retention

o +2.7V to +5.25V Single-Supply Operation

MAX5487/MAX5488/MAX5489

Dual, 256-Tap, Nonvolatile, SPI-Interface,

Linear-Taper Digital Potentiometers

________________________________________________________________

Maxim Integrated Products

19-3478; Rev 4; 4/10

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

EVALUATION KIT

AVAILABLE

SPI is a trademark of Motorola, Inc.

Ordering Information

PART TEMP RANGE PIN-PACKAGE

END-TO-END

RESISTANCE (kΩ)

TOP MARK

MAX5487ETE+ -40°C to +85°C 16 TQFN-EP* 10 ABR

MAX5487EUD+ -40°C to +85°C 14 TSSOP 10 —

EP = Exposed pad.

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

MAX5487

MAX5488

MAX5489

POR

8-BIT

LATCH

16-BIT

NV RAM

SCLK

DIN

DECODER

256

DECODER

256

GND

SPI

INTERFACE

8-BIT

LATCH

Functional Diagram

*EP

*EXPOSED PAD.

DIN

N.C.

12 10 9

I.C.

GND

N.C.

MAX5487

MAX5488

MAX5489

SCLK WB

TQFN

3mm x 3mm

TOP VIEW

Pin Configurations

Pin Configurations continued at end of data sheet.

Ordering Information continued at end of data sheet.

Summary of content (13 pages)

PAGE 1
9-3478; Rev 4; 4/10 KIT ATION EVALU E L B A IL AVA Dual, 256-Tap, Nonvolatile, SPI-Interface, Linear-Taper Digital Potentiometers Features The MAX5487/MAX5488/MAX5489 dual, linear-taper, digital potentiometers function as mechanical potentiometers with a simple 3-wire SPI™-compatible digital interface that programs the wipers to any one of 256 tap positions. These digital potentiometers feature a nonvolatile memory (EEPROM) to return the wipers to their previously stored positions upon power-up.
PAGE 2
MAX5487/MAX5488/MAX5489 Dual, 256-Tap, Nonvolatile, SPI-Interface, Linear-Taper Digital Potentiometers ABSOLUTE MAXIMUM RATINGS VDD to GND ...........................................................-0.3V to +6.0V All Other Pins to GND......................-0.3V to the lower of (VDD + 0.3V) and +6.0V Maximum Continuous Current into H_, W_, and L_ MAX5487......................................................................±5.0mA MAX5488......................................................................
PAGE 3
Dual, 256-Tap, Nonvolatile, SPI-Interface, Linear-Taper Digital Potentiometers (VDD = +2.7V to +5.25V, VH = VDD, VL = GND, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VDD = +5.0V, TA = +25°C, unless otherwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DIGITAL INPUTS Input High Voltage (Note 5) VIH Input Low Voltage VIL Input Leakage Current IIN Input Capacitance CIN VDD = 3.6V to 5.25V 2.4 VDD = 2.7V to 3.6V 0.7 x VDD V VDD = 2.7V to 5.
PAGE 4
MAX5487/MAX5488/MAX5489 Dual, 256-Tap, Nonvolatile, SPI-Interface, Linear-Taper Digital Potentiometers DC ELECTRICAL CHARACTERISTICS (continued) (VDD = +2.7V to +5.25V, VH = VDD, VL = GND, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VDD = +5.0V, TA = +25°C, unless otherwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 5.25 V 400 µA 1 µA POWER SUPPLIES Power-Supply Voltage VDD Supply Current IDD Standby Current 2.
PAGE 5
Dual, 256-Tap, Nonvolatile, SPI-Interface, Linear-Taper Digital Potentiometers SUPPLY CURRENT vs. TEMPERATURE 0.3 0.2 0.
PAGE 6
Typical Operating Characteristics (continued) (VDD = +5.0V, TA = +25°C, unless otherwise noted.) MIDSCALE FREQUENCY RESPONSE (MAX5488) MIDSCALE FREQUENCY RESPONSE (MAX5489) CW_ = 10pF -10 -15 -20 -25 -30 -25 -30 -35 -40 -40 -45 -45 -50 0.15 0.10 CW_ = 50pF -20 -35 0.20 1 10 1000 100 0 -0.05 -0.10 -0.15 -50 0.1 0.05 DNL (LSB) CW_ = 50pF GAIN (dB) -0.20 0.1 1 10 1000 100 0 32 64 96 128 160 192 224 256 FREQUENCY (kHz) FREQUENCY (kHz) TAP POSITION VARIABLE-RESISTOR INL vs.
PAGE 7
Dual, 256-Tap, Nonvolatile, SPI-Interface, Linear-Taper Digital Potentiometers VARIABLE-RESISTOR DNL vs. TAP POSITION (MAX5489) 0.10 0.8 0.20 0.6 0.15 0.10 0 -0.05 0.2 DNL (LSB) INL (LSB) 0 -0.2 -0.10 -0.6 -0.15 -1.0 32 64 128 160 192 224 256 96 -0.20 0 32 64 96 128 160 192 224 256 0 32 64 96 128 160 192 224 256 TAP POSITION TAP POSITION TAP POSITION VOLTAGE-DIVIDER INL vs. TAP POSITION (MAX5489) CROSSTALK vs. FREQUENCY END-TO-END RESISTANCE CHANGE vs.
PAGE 8
Dual, 256-Tap, Nonvolatile, SPI-Interface, Linear-Taper Digital Potentiometers MAX5487/MAX5488/MAX5489 Pin Description PIN NAME FUNCTION TQFN TSSOP 1 14 VDD 2 13 SCLK Serial-Interface Clock Input 3 12 DIN Serial-Interface Data Input Active-Low Chip-Select Digital Input Power Supply. Bypass VDD to GND with a 0.1µF capacitor as close to the device as possible. 4 11 CS 5, 6, 9 7, 9, 10 N.C. No Connection. Not internally connected. 7 8 GND Ground 8, 16 — I.C.
PAGE 9
Dual, 256-Tap, Nonvolatile, SPI-Interface, Linear-Taper Digital Potentiometers 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 — — C1 C0 — — A1 A0 D7 D6 D5 D4 D3 D2 D1 D0 Write Wiper Register A 0 0 0 0 0 0 0 1 D7 D6 D5 D4 D3 D2 D1 D0 Write Wiper Register B 0 0 0 0 0 0 1 0 D7 D6 D5 D4 D3 D2 D1 D0 Write NV Register A 0 0 0 1 0 0 0 1 D7 D6 D5 D4 D3 D2 D1 D0 Write NV Register B 0 0 0 1 0 0 1 0 D7 D6 D5 D4 D3 D2 D1 D0 Copy
PAGE 10
MAX5487/MAX5488/MAX5489 Dual, 256-Tap, Nonvolatile, SPI-Interface, Linear-Taper Digital Potentiometers A) 16-BIT COMMAND/DATA WORD CS SCLK 1 2 DIN 3 4 C1 C0 3 4 C1 C0 5 6 7 8 9 A1 A0 D7 10 D6 11 D5 12 D4 13 D3 14 D2 15 D1 16 D0 B) 8-BIT COMMAND WORD CS SCLK 1 DIN 2 5 6 7 8 A1 A0 Figure 3. Digital-Interface Format or both simultaneously, depending on the state of A1 and A0.
PAGE 11
Dual, 256-Tap, Nonvolatile, SPI-Interface, Linear-Taper Digital Potentiometers H_ 30V A =1+ W_ MAX5487 MAX5488 MAX5489 VOUT MAX480 R1 R2 L_ fC = 1 2π × R3 × C Adjustable Voltage Reference Figure 4. Positive LCD-Bias Control Using a Voltage-Divider Figure 7 shows the MAX5487/MAX5488/MAX5489 used as the feedback resistors in multiple adjustable voltage-reference applications. Independently adjust the output voltages of the MAX6160s from 1.23V to VIN 0.
PAGE 12
MAX5487/MAX5488/MAX5489 Dual, 256-Tap, Nonvolatile, SPI-Interface, Linear-Taper Digital Potentiometers 5V IN IN V OUT1 OUT OUT 10kΩ FOR THE MAX5487 R 50kΩ VOUT_ = 1.23V x FOR THE MAX5488 R 100kΩ VOUT_ = 1.23V x FOR THE MAX5489 R VOUT_ = 1.23V x VOUT2 HB HA MAX6160 MAX6160 ADJ 1/2 MAX5487 1/2 MAX5488 1/2 MAX5489 WA R GND ADJ R GND LA 1/2 MAX5487 1/2 MAX5488 1/2 MAX5489 WB R2 = RHL x D / 256 WHERE RHL = END-TO-END RESISTANCE AND D = DECIMAL VALUE OF WIPER CODE LB Figure 7.
PAGE 13
Dual, 256-Tap, Nonvolatile, SPI-Interface, Linear-Taper Digital Potentiometers REVISION NUMBER REVISION DATE 3 1/07 — 4 4/10 Updated Ordering Information (added lead-free packaging and automotive qualified part, released TSSOP package), and updated Absolute Maximum Ratings DESCRIPTION PAGES CHANGED 1, 8, 12, 15 1, 2, 12 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.