Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsData collecting ICsData acquisition IC - Digital potentiometer linear Non-permanent TSSOP 14

General Description

The MAX5391/MAX5393 dual 256-tap, volatile, low-

voltage linear taper digital potentiometers offer three

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

Operating from a single +1.7V 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

MAX5391/MAX5393 make the devices uniquely suitable

for the portable consumer market and battery backup

industrial applications.

The MAX5391/MAX5393 include two digital potentiom-

eters in a voltage-divider configuration. The MAX5391/

MAX5393 are specified over the -40°C to +125°C auto-

motive temperature range and are available in a 16-pin,

3mm x 3mm TQFN and a 14-pin TSSOP package,

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 +1.7V to +5.5V Supply Operation

● Low 12μA Quiescent Supply Current

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

Values

● SPI-Compatible Interface

● Wiper Set to Midscale on Power-Up

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

19-5035; Rev 3; 10/14

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

perature range.

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

*EP = Exposed paddle.

PART PIN-PACKAGE

END-TO-END

RESISTANCE (kΩ)

MAX5391LATE+ 16 TQFN-EP* 10

MAX5391MATE+ 16 TQFN-EP* 50

MAX5391NATE+ 16 TQFN-EP* 100

MAX5393LAUD+ 14 TSSOP 10

MAX5393MAUD+ 14 TSSOP 50

MAX5393NAUD+ 14 TSSOP 100

LATCH

SPI

CHARGE

PUMP

SCLK

DIN

BYP

GND

256 DECODER

HA LA

LATCH

POR

MAX5391

MAX5393

MAX5391/MAX5393 Dual 256-Tap, Volatile, Low-Voltage

Linear Taper Digital Potentiometers

Functional Diagram

Ordering Information

EVALUATION KIT AVAILABLE

Summary of content (14 pages)

PAGE 1
EVALUATION KIT AVAILABLE MAX5391/MAX5393 General Description The MAX5391/MAX5393 dual 256-tap, volatile, lowvoltage linear taper digital potentiometers offer three end-to-end resistance values of 10kΩ, 50kΩ, and 100kΩ. Operating from a single +1.7V 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
MAX5391/MAX5393 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) or +6V All Other Pins to GND..............................................-0.3V to +6V Continuous Current into H_, W_, and L_ MAX5391L/MAX5393L........................................................±5mA MAX5391M/MAX5393M..
PAGE 3
MAX5391/MAX5393 Dual 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometers Electrical Characteristics (continued) (VDD = +1.7V to +5.5V, VH_ = VDD, VL_ = 0V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VDD = +1.8V, TA = +25°C.
PAGE 4
MAX5391/MAX5393 Dual 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometers H N.C. W W L L Figure 1. Voltage-Divider and Variable Resistor Configurations Typical Operating Characteristics (VDD = 1.8V, TA = +25°C, unless otherwise noted.) 20 VDD = 2.6V 15 10 VDD = 1.8V 5 25 VDD = 2.6V 100 20 15 10 0 1.7 2.2 2.7 3.2 3.7 4.2 4.7 VDD (V) RESISTANCE (W_-TO-L_) vs. TAP POSITION (10kΩ) RESISTANCE (W_-TO-L_) vs. TAP POSITION (50kΩ) RESISTANCE (W_-TO-L_) vs.
PAGE 5
MAX5391/MAX5393 Dual 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometers Typical Operating Characteristics (continued) (VDD = 1.8V, TA = +25°C, unless otherwise noted.) 100 VDD = 5V 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0 10kΩ 0.02 0 -0.02 -0.04 -0.01 -0.06 -0.02 -0.08 -0.10 -40 -25 -10 5 20 35 50 65 80 95 110 125 0.10 0.08 1.0 0.06 153 204 0.8 0.6 0 -0.02 INL (LSB) 0.2 DNL (LSB) 0.4 0 -0.02 0 -0.04 -0.4 -0.06 -0.06 -0.6 -0.08 -0.
PAGE 6
MAX5391/MAX5393 Dual 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometers Typical Operating Characteristics (continued) (VDD = 1.8V, TA = +25°C, unless otherwise noted.) 0.08 0.06 0.4 0.3 0.04 0.2 0.02 0.02 0.1 0 -0.02 INL (LSB) 0.04 DNL (LSB) 0 -0.02 0 -0.1 -0.04 -0.04 -0.2 -0.06 -0.06 -0.3 -0.08 -0.08 -0.4 -0.10 0 102 153 204 -0.10 255 102 153 204 -0.5 255 0 51 102 153 204 255 TAP POSITION VOLTAGE-DIVIDER INL vs.
PAGE 7
MAX5391/MAX5393 Dual 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometers Typical Operating Characteristics (continued) (VDD = 1.8V, TA = +25°C, unless otherwise noted.) -10 VDD = 1.8V -10 -10 VDD = 1.8V VDD = 1.8V -20 -20 -20 VIN = 1VP-P 1 0.01 100 -30 10k VIN = 1VP-P 0.01 FREQUENCY (kHz) 100 10k 0.20 0.18 0.16 THD+N (%) 50kΩ 10k 100kΩ 0.12 0.10 0.08 0.06 -100 0.04 -120 0.01 0.1 1 50kΩ 0.02 10kΩ 10 100 0 1000 0.01 0.
PAGE 8
MAX5391/MAX5393 Dual 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometers Pin Configurations VDD N.C. SCLK DIN TOP VIEW 12 11 10 9 TOP VIEW GND 1 N.C. 13 HA 14 MAX5391 CS 7 BYP HB 3 *EP 6 N.C. 5 GND I.C. 5 BYP 6 1 2 3 4 WB LB I.C. + HB CS 7 14 LA 13 HA LB 2 WB 4 WA 15 LA 16 8 + MAX5393 12 WA 11 VDD 10 N.C. 9 SCLK 8 DIN *EP = EXPOSED PAD Pin Description PIN MAX5391 (TQFN-EP) MAX5393 (TSSOP) NAME FUNCTION 1 3 HB Resistor B High Terminal.
PAGE 9
MAX5391/MAX5393 Dual 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometers Detailed Description to the wiper. The value of CBYP does affect the startup time of the charge pump; however, CBYP does not impact the ability to communicate with the device, nor is there a minimum CBYP requirement. The maximum wiper impedance specification is not guaranteed until the charge pump is fully settled. See the BYP Ramp vs.
PAGE 10
MAX5391/MAX5393 Dual 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometers tCSW CS tCS1 tCSO tCSS tCL tCH tCP tCSH tDH SCLK tDS DIN Figure 3. SPI Timing Diagram REG A: The data byte writes to register A, and the wiper of potentiometer A moves to the appropriate position at the rising edge of CS. D[7:0] indicates the position of the wiper. D[7:0] = 00h moves the wiper to the position closest to LA. D[7:0] = FFh moves the wiper closest to HA. D[7:0] is 80h following power-on.
PAGE 11
MAX5391/MAX5393 Dual 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometers H_ VIN L_ VOUT W_ VIN VOUT W_ H_ L_ Figure 4. Variable-Gain Noninverting Amplifier VOUT1 OUT1 VOUT2 OUT2 IN H_ H_ W_ SET1 +2.5V IN MAX8866 V+ Figure 4. Variable-Gain Noninverting Amplifier W_ L_ VREF OUT MAX6037 H_ W_ L_ GND L_ SET2 Figure 6. Adjustable Dual Linear Regulator www.maximintegrated.com Figure 7.
PAGE 12
MAX5391/MAX5393 Dual 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometers Variable-Gain Current-to-Voltage Converter Offset Voltage Adjustment Circuit LCD Bias Control Chip Information 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 11 shows an offset voltage adjustment circuit using a dual potentiometer.
PAGE 13
MAX5391/MAX5393 Dual 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometers Package Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO.
PAGE 14
MAX5391/MAX5393 Dual 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometers Revision History REVISION NUMBER REVISION DATE PAGES CHANGED 0 10/09 Initial release — 1 4/10 Added Soldering Temperature in Absolute Maximum Ratings; corrected code in Conditions of -3dB Bandwidth specification and corrected Integral Nonlinearity specifications in Electrical Characteristics 2 2 11/10 Changed Electrical Characteristics heading and changed Figures 5, 8, 10, 11 3 10/14 Removed automotive