Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsData collecting ICsData acquisition IC - Digital potentiometer linear Non-permanent uMAX 10

General Description

The MAX5386/MAX5388 dual, 256-tap, volatile, low- volt-

age linear taper digital potentiometers offer three end-

to-end resistance values of 10kΩ, 50kΩ, and 100kΩ.

Operating from a single +2.6V to +5.5V power supply

these devices provide a low 35ppm/°C end-to-end tem-

perature coefficient. The devices feature an SPI interface.

The small package size, low supply voltage, low sup-

ply current, and automotive temperature range of the

MAX5386/MAX5388 make the devices uniquely suitable

for the portable consumer market and battery-backup

industrial applications.

The MAX5386 includes two digital potentiometers in a

voltage-divider configuration. The MAX5388 includes

one digital potentiometer in a voltage-divider configura-

tion and one digital potentiometer in a variable-resistor

configuration. The MAX5386/MAX5388 are specified over

an extended -40°C to +125°C temperature range and are

available in 16-pin, 3mm x 3mm TQFN or 10-pin, 3mm x

5mm µMAX

packages, respectively.

Applications

● Low-Voltage Battery Applications

● Portable Electronics

● Mechanical Potentiometer Replacement

● Offset and Gain Control

● Adjustable Voltage References/Linear Regulators

Features

● Dual, 256-Tap, Linear Taper Positions

● Single +2.6V to +5.5V Supply Operation

● Low (< 1μA) Quiescent Supply Current

● 10kΩ, 50kΩ, 100kΩ End-to-End Resistance Values

● SPI-Compatible Interface

● Power-On Sets Wiper to Midscale

● -40°C to +125°C Operating Temperature Range

Functional Diagrams appear at end of data sheet.

19-4599; Rev 3; 9/14

μMAX is a registered trademark of Maxim Integrated Products, Inc.

Note: All devices are specified over the -40°C to +125°C

operating temperature range.

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

*EP = Exposed pad.

PART

PIN-

PACKAGE

END-TO-END

RESISTANCE (kΩ)

MAX5386LATE+ 16 TQFN-EP* 10

MAX5386MATE+ 16 TQFN-EP* 50

MAX5386NATE+ 16 TQFN-EP* 100

MAX5388LAUB+ 10 µMAX 10

MAX5388MAUB+ 10 µMAX 50

MAX5388NAUB+ 10 µMAX 100

I.C.

SCLK

DIN

1 3

12 10 9

N.C.

GND

*EP

*EP = EXPOSED PAD.

MAX5386

WB N.C.

N.C.

TQFN

TOP VIEW

SCLKWB

GND

MAX5388

µMAX

TOP VIEW

DINCS

MAX5386/MAX5388 Dual, 256-Tap, Volatile, Low-Voltage

Linear Taper Digital Potentiometers

Pin Congurations

Ordering Information

EVALUATION KIT AVAILABLE

Summary of content (13 pages)

PAGE 1
EVALUATION KIT AVAILABLE MAX5386/MAX5388 Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometers General Description Features The MAX5386/MAX5388 dual, 256-tap, volatile, low- voltage linear taper digital potentiometers offer three endto-end resistance values of 10kΩ, 50kΩ, and 100kΩ. Operating from a single +2.6V to +5.5V power supply these devices provide a low 35ppm/°C end-to-end temperature coefficient. The devices feature an SPI interface.
PAGE 2
MAX5386/MAX5388 Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometers Absolute Maximum Ratings 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 in to H_, W_, and L_ MAX5386L/MAX5388L................................................... ±5mA MAX5386M/MAX5388M...................................
PAGE 3
MAX5386/MAX5388 Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometers Electrical Characteristics (continued) (VDD = +2.6V to +5.5V, VH_ = VDD, VL_ = GND, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VDD = +5V, TA = +25˚C. ) (Note 1) PARAMETER Total Harmonic Distortion Plus Noise SYMBOL THD+N Wiper Settling Time (Note 6) tS CONDITIONS MIN Measured at W, VH_ = 1VRMS at 1kHz TYP MAX 0.
PAGE 4
MAX5386/MAX5388 Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometers Typical Operating Characteristics (VDD = 5V, TA = +25°C, unless otherwise noted.) RESISTANCE (W TO L) vs. TAP POSITION (10kΩ) MAX5386 toc04 11,000 10,000 9000 8000 0.0001 55,000 50,000 45,000 35,000 6000 30,000 5000 25,000 4000 20,000 3000 15,000 2000 10,000 1000 5000 0 0 51 204 255 170 150 130 VDD = 5V 110 90 70 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 WIPER VOLTAGE www.maximintegrated.
PAGE 5
MAX5386/MAX5388 Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometers Typical Operating Characteristics (continued) (VDD = 5V, TA = +25°C, unless otherwise noted.) 0.06 0.6 0.2 -0.02 INL (LSB) 0.02 DNL (LSB) 0.4 0.02 0 0 -0.02 0 -0.2 -0.04 -0.04 -0.4 -0.06 -0.06 -0.6 -0.08 -0.08 -0.8 51 102 153 204 0 51 102 153 204 -1.0 255 204 VARIABLE-RESISTOR INL vs. TAP POSITION (100kΩ) VOLTAGE-DIVIDER DNL vs. TAP POSITION (10kΩ) IWIPER = 400µA 0.4 0.10 0.3 0.
PAGE 6
MAX5386/MAX5388 Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometers Typical Operating Characteristics (continued) (VDD = 5V, TA = +25°C, unless otherwise noted.) 0.3 0.4 0.3 0.2 0.1 0.1 INL (LSB) 0.2 0 -0.1 -0.2 -0.3 -0.4 -0.4 51 102 153 204 -0.5 255 VW-L 20mV/div 0 -0.
PAGE 7
MAX5386/MAX5388 Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometers Pin Description PIN NAME FUNCTION 3 HB Resistor B High Terminal. The voltage at HB can be higher or lower than the voltage at LB. Current can flow in to or out of HB. 2 4 WB Resistor B Wiper Terminal 3 2 LB Resistor B Low Terminal. The voltage at LB can be higher or lower than the voltage at HB. Current can flow in to or out of LB. 4 — I.C. Internally Connected. Connect to GND. 5 1 GND Ground.
PAGE 8
MAX5386/MAX5388 Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometers Detailed Description The first bit A0 (address bit) addresses one of the two potentiometers; writing a zero in A0 addresses control register A and writing a one in A0 addresses control register B. See Table 1. The power-on reset (POR) circuitry sets the wiper to midscale (D[7:0] 1000 0000).
PAGE 9
MAX5386/MAX5388 Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometers COMMAND STARTED 9 BITS WIPER REGISTER LOADED CS SCLK DIN A0 D7 D6 D5 D4 D3 D2 D0 D1 Figure 2. SPI Digital Interface Format tCSW CS tCS1 tCSO tCSS tCL tCH tCP tCSH tDH SCLK tDS DIN Figure 3. SPI Timing Diagram www.maximintegrated.
PAGE 10
MAX5386/MAX5388 Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometers Applications Information Adjustable Dual Linear Regulator Variable-Gain Amplifier Figure 4 shows a potentiometer adjusting the gain of a noninverting amplifier. Figure 5 shows a potentiometer adjusting the gain of an inverting amplifier. Figure 6 shows an adjustable dual linear regulator using a dual potentiometer as two variable resistors.
PAGE 11
MAX5386/MAX5388 Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometers Variable Gain Current to Voltage Converter Programmable Filter LCD Bias Control Offset Voltage Adjustment Circuit Figure 8 shows a variable gain current-to-voltage converter using a potentiometer as a variable resistor. Figure 9 shows a positive LCD bias control circuit using a potentiometer as a voltage-divider. Figure 10 shows a programmable filter using a dual potentiometer.
PAGE 12
MAX5386/MAX5388 Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometers Functional Diagrams LA WA VDD HA MAX5386 256 DECODER HB SCLK LATCH SPI POR WB 256 DECODER DIN LATCH LB GND LA CS VDD WA MAX5388 HB 256 DECODER SCLK LATCH SPI POR WB 256 DECODER DIN LATCH LB GND Chip Information PROCESS: BiCMOS CS Package Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages.
PAGE 13
MAX5386/MAX5388 Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometers Revision History REVISION NUMBER REVISION DATE PAGES CHANGED 0 4/09 Initial release 1 11/09 Released MAX5386LATE+ and MAX5386NATE+ in Ordering Information; corrected specifications for Full-Scale Error, Zero-Scale Error, and Integral Nonlinearity in Electrical Characteristics; added I.C.