Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsData collecting ICsData acquisition IC - Digital potentiometer linear Non-permanent uMAX 8

General Description

The MAX5160/MAX5161 linear-taper digital potentiome-

ters perform the same function as a mechanical poten-

tiometer or a variable resistor. They consist of a fixed

resistor and a wiper contact with 32 tap points that are

digitally controlled by three lines for the 8-pin MAX5160

or by two lines for the 6-pin MAX5161.

These parts are ideal for applications requiring digitally

controlled resistors. Three resistance values are avail-

able for each part type: 50kΩ, 100kΩ, and 200kΩ. A

nominal resistor temperature coefficient of 50ppm/°C

end-to-end and only 5ppm/°C ratiometric makes the

MAX5160 ideal for applications requiring a low-temper-

ature-coefficient variable resistor, such as low-tempco,

adjustable-gain circuit configurations.

The MAX5160 is available in an 8-pin µMAX package,

and the MAX5161 is available in a 6-pin SOT23 pack-

age. Both devices are guaranteed over the extended-

industrial temperature range (-40°C to +85°C).

Applications

LCD Screen Adjustment

Volume Control

Mechanical Potentiometer Replacement

Features

♦ 32 Tap Positions

♦ 50kΩ, 100kΩ, and 200kΩ Resistance Values

♦ 400Ω Wiper Resistance

♦ ±25% Resistance Tolerance

♦ 3-Wire Serial Data Input

♦ ±1LSB DNL

♦ ±0.5LSB INL

♦ 100nA Supply Current

♦ +2.7V to +5.5V Single-Supply Operation

♦ Power-On Reset: Wiper Goes to Midscale

(position 16)

♦ ±2kV ESD Protection

♦ Small-Footprint Packages

6-Pin SOT23 (MAX5161)

8-Pin µMAX (MAX5160)

♦ Glitchless Switching Between the Resistor Taps

MAX5160/MAX5161

Low-Power Digital Potentiometers

________________________________________________________________Maxim Integrated Products 1

WGND

U/D

INC

MAX5160

µMAX

TOP VIEW

U/DGND

16V

5 INC

MAX5161

SOT23-6

UP/DN

COUNTER

GND

INC

U/D

POSITION

DECODER

MAX5160

MAX5161

Functional Diagram

19-1435; Rev 2a; 2/01

PART

MAX5160NEUA

MAX5160MEUA

PIN-

PACKAGE

8 µMAX

Pin Configurations

Selector Guide

Ordering Information

-40°C to +85°C

TEMP. RANGE

MAX5160LEUA -40°C to +85°C 8 µMAX

MAX5161NEZT

-40°C to +85°C 6 SOT23

MAX5161MEZT -40°C to +85°C 6 SOT23

MAX5161LEZT -40°C to +85°C 6 SOT23

(kΩ)

200

100

200

100

For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,

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

PART

TOP

MARK

(kΩ)

MAX5160NEUA — 200

MAX5160MEUA — 100

MAX5160LEUA — 50

MAX5161NEZT AAAC 200

MAX5161MEZT AAAB 100

MAX5161LEZT AAAA 50

Summary of content (9 pages)

PAGE 1
9-1435; Rev 2a; 2/01 Low-Power Digital Potentiometers Features ♦ 32 Tap Positions These parts are ideal for applications requiring digitally controlled resistors. Three resistance values are available for each part type: 50kΩ, 100kΩ, and 200kΩ. A nominal resistor temperature coefficient of 50ppm/°C end-to-end and only 5ppm/°C ratiometric makes the MAX5160 ideal for applications requiring a low-temperature-coefficient variable resistor, such as low-tempco, adjustable-gain circuit configurations.
PAGE 2
MAX5160/MAX5161 Low-Power Digital Potentiometers ABSOLUTE MAXIMUM RATINGS VDD to GND ..............................................................-0.3V to +6V CS, INC, U/D to GND ...............................................-0.3V to +6V H, L, W to GND.......................................... -0.3V to (VDD + 0.3V) Input and Output Latchup Immunity ..............................±200mA Maximum Continuous Current into H, L, and W MAX516_ _ E_ _...............................................................
PAGE 3
Low-Power Digital Potentiometers WIPER RESISTANCE vs. WIPER VOLTAGE 800 END-TO-END RESISTANCE % CHANGE RWMAX = 574.0804 WIPER RESISTANCE (Ω) 0.06 MAX5160/61 toc01 1,000 VDD = +2.7V 600 400 VDD = +5V 200 200kΩ 50kΩ 0.04 0.02 100kΩ MAX5160/61 toc02 END-TO-END RESISTANCE % CHANGE vs. TEMPERATURE 0 -0.02 100kΩ 200kΩ -0.04 50kΩ -0.06 -0.08 -0.10 -0.12 -0.14 0 0 1 2 3 4 WIPER VOLTAGE (V) TEMPERATURE (°C) END-TO-END RESISTANCE vs. TAP POSITION END-TO-END RESISTANCE vs.
PAGE 4
Typical Operating Characteristics (continued) (VDD = +5V, TA = +25°C, unless otherwise noted.) MAX5160/61 toc06 0.8 0.7 0.6 MAX5160/61 toc07 TAP-TO-TAP SWITCHING TRANSIENT SUPPLY CURRENT vs. TEMPERATURE 0.9 SUPPLY CURRENT (µA) MAX5160/MAX5161 Low-Power Digital Potentiometers OUTPUT W 50mV/div VDD = +5V 0.5 0.4 0V 0.3 0.2 INC 2V/div VDD = +2.7V 0V 0.
PAGE 5
Low-Power Digital Potentiometers The MAX5160/MAX5161 consist of resistor arrays with thirty-one resistive elements. Thirty-two tap points are accessible to the wiper along the resistor string between H and L. Logic inputs CS, U/D, and INC determine the position of the wiper. With CS low and U/D high, a high-to-low transition on INC increments the internal counter, increasing the resistance between W and L.
PAGE 6
MAX5160/MAX5161 Low-Power Digital Potentiometers Alternative Positive LCD Bias Control Alternatively, use an op amp to provide buffering and gain to the output of the MAX5160/MAX5161. Connect the MAX5160 to the positive input of a noninverting op amp (Figure 3) to select a portion of the input signal by digitally controlling the wiper terminal. Figure 4 shows a similar circuit for the MAX5161.
PAGE 7
Low-Power Digital Potentiometers MAX5160/MAX5161 CS tCI tIC tIL INC tIH tDI U/D tID tIW W Figure 6.
PAGE 8
Low-Power Digital Potentiometers 8LUMAXD.
PAGE 9
Low-Power Digital Potentiometers 6 LEAD THIN SOT23.EPS 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.