Datasheet

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General Description

The MAX5394 single, 256-tap volatile, low-voltage

linear taper digital potentiometer offers three end-to-

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

Potentiometer terminals are independent of supply for

voltages up to 5.25V with single-supply operation from

1.7V to 5.5V (charge pump enabled). User-controlled

shutdown modes allow the H, W, or L terminal to be

opened with the wiper position set to zero-code, midcode,

full-code, or the value contained in the wiper register. Ultra-

low-quiescent supply current (< 1μA) can be achieved

for supply voltages between 2.6V and 5.5V by disabling

the internal charge pump and not allowing potentiometer

terminals to exceed the supply voltage by more than

0.3V. The MAX5394 provides a low 50ppm/°C end-to-end

temperature coefcient and features a SPI serial interface.

The small package size, low operating supply voltage,

low supply current, and automotive temperature range

of the MAX5394 make the device uniquely suited for the

portable consumer market and battery-backup industrial

applications.

The MAX5394 is available in a lead-free, 8-pin TDFN

(2mm x 2mm) package. The device operates over the

-40°C to +125°C automotive temperature range.

Features

● Single Linear Taper 256-Tap Positions

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

● 1.7V to 5.5V Extended Single Supply

● 0 to 5.25V H, W, L Operating Voltage Independent of

● 1μA (typ) Supply Current in Low-Power Mode

● ±1.0 LSB INL, ±0.5 LSB DNL (max) Wiper Accuracy

● Power-On Sets Wiper to Midscale

● 50ppm/°C End-to-End Temperature Coefficient

● 5ppm/°C Ratiometric Temperature Coefficient

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

● 2mm x 2mm, 8-Pin TDFN Package

● SPI-Compatible Serial Interface

Applications

● Portable Electronics

● System Calibration

● Battery-Powered Systems

● Mechanical Potentiometer Replacement

Ordering Information appears at end of data sheet.

19-6392; Rev 2; 10/14

SPI

INTERFACE

1.7V TO 5.5V

(CHARGE PUMP ENABLED)

+5V

MAX5394

MAX4250

GND

= 1 + R

MAX5394

DIN

SCLK

For related parts and recommended products to use with this part, refer to www.maximintegrated.com/MAX5394.related.

MAX5394 Single, 256-Tap Volatile, SPI, Low-Voltage Linear

Taper Digital Potentiometer

Typical Operating Circuit

Summary of content (15 pages)

PAGE 1
MAX5394 Single, 256-Tap Volatile, SPI, Low-Voltage Linear Taper Digital Potentiometer General Description Features The MAX5394 single, 256-tap volatile, low-voltage linear taper digital potentiometer offers three end-toend resistance values of 10kΩ, 50kΩ, and 100kΩ. Potentiometer terminals are independent of supply for voltages up to 5.25V with single-supply operation from 1.7V to 5.5V (charge pump enabled).
PAGE 2
MAX5394 Single, 256-Tap Volatile, SPI, Low-Voltage Linear Taper Digital Potentiometer Absolute Maximum Ratings (All voltages referenced to GND.) VDD......................................................................... -0.3V to +6V H, W, L (charge pump enabled)........................... -0.3V to +5.5V H, W, L (charge pump disabled).................-0.3V to the lower of (VDD + 0.3V) or +6V All Other Pins.......................................................... -0.
PAGE 3
MAX5394 Single, 256-Tap Volatile, SPI, Low-Voltage Linear Taper Digital Potentiometer Electrical Characteristics (continued) (VDD = 1.7V to 5.5V, VH = VDD, VL = GND, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VDD = 1.8V, TA = +25°C.) (Note 2) PARAMETER Differential Nonlinearity Wiper Resistance (Note 5) SYMBOL R-DNL RWL CONDITIONS (Note 4) MIN TYP -0.5 Charge pump enabled, 1.7V < VDD < 5.5V 25 Charge pump disabled, 2.6V < VDD < 5.5V MAX UNITS +0.
PAGE 4
MAX5394 Single, 256-Tap Volatile, SPI, Low-Voltage Linear Taper Digital Potentiometer Electrical Characteristics (continued) (VDD = 1.7V to 5.5V, VH = VDD, VL = GND, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VDD = 1.8V, TA = +25°C.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS TIMING CHARACTERISTICS (Note 9) SCLK Frequency fSCLK SCLK Period tSCLK SCLK Pulse-Width High tCH SCLK Pulse-Width Low tCL 2.6V < VDD < 5.5V 50 1.7V < VDD < 2.6V 25 2.
PAGE 5
MAX5394 Single, 256-Tap Volatile, SPI, Low-Voltage Linear Taper Digital Potentiometer H N.C. W W L L Figure 1. Voltage-Divider and Variable Resistor Configurations DIN15 DIN DIN14 DIN13 SCLK tCSH0 2 tCSS0 DIN11 tDH tDS 1 DIN12 3 4 5 tCH DIN10 DIN9 DIN8 7 8 DIN2 DIN1 DIN0 DIN15 tCP 6 tCL 14 15 tCSA 16 1 tCSH1 CS tCSPW tCSF Figure 2. SPI Timing Diagram www.maximintegrated.
PAGE 6
MAX5394 Single, 256-Tap Volatile, SPI, Low-Voltage Linear Taper Digital Potentiometer Typical Operating Characteristics (VDD = 1.8V, TA = +25°C, unless otherwise noted.) 25 20 15 10 5 -40 -25 -10 5 20 35 50 65 80 95 110 125 4 MAX5394 toc03 15 TA = -40°C 10 5 0 5 5 4 3 2 1.70 2.65 3.60 4.55 5.
PAGE 7
MAX5394 Single, 256-Tap Volatile, SPI, Low-Voltage Linear Taper Digital Potentiometer Typical Operating Characteristics (continued) (VDD = 1.8V, TA = +25°C, unless otherwise noted.
PAGE 8
MAX5394 Single, 256-Tap Volatile, SPI, Low-Voltage Linear Taper Digital Potentiometer Typical Operating Characteristics (continued) (VDD = 1.8V, TA = +25°C, unless otherwise noted.) 0 -10 0 VDD = 5V GAIN (dB) GAIN (dB) GAIN (dB) 0 MIDSCALE FREQUENCY RESPONSE (100kΩ) 10 MAX5394 toc14 10 MAX5394 toc13 10 MIDSCALE FREQUENCY RESPONSE (50kΩ) MAX5394 toc15 MIDSCALE FREQUENCY RESPONSE (10kΩ) -10 VDD = 5V -10 VDD = 5V 1k 10k 100k 1M -30 0.01k 10M 0.
PAGE 9
MAX5394 Single, 256-Tap Volatile, SPI, Low-Voltage Linear Taper Digital Potentiometer Typical Operating Characteristics (continued) (VDD = 1.8V, TA = +25°C, unless otherwise noted.) INL (LSB) 0 -0.1 -0.2 VDD = 1.8V, VH = 5.0V, CHARGE PUMP ON VDD = 5.0V, VH = 5.0V, CHARGE PUMP OFF -0.5 0 0.5 64 96 0.3 0.1 0 -0.1 -0.2 -0.3 -0.3 -0.4 -0.4 32 0 64 96 -0.5 128 160 192 224 256 64 96 128 160 192 224 256 TAP POSITION TAP POSITION VOLTAGE-DIVIDER DNL vs.
PAGE 10
MAX5394 Single, 256-Tap Volatile, SPI, Low-Voltage Linear Taper Digital Potentiometer Pin Configuration TOP VIEW 1 GND 2 CS 3 DIN + L MAX5394 EP 4 8 H 7 W 6 VDD 5 SCLK TDFN Pin Description PIN NAME FUNCTION 1 L 2 GND Ground 3 Active-Low Chip-Select Digital Input 4 CS DIN 5 SCLK 6 VDD Power Supply 7 W Wiper Terminal 8 H High Terminal. The voltage at H can be greater than or less than the voltage at L. Current can flow into or out of H. — EP Exposed Pad.
PAGE 11
MAX5394 Single, 256-Tap Volatile, SPI, Low-Voltage Linear Taper Digital Potentiometer Functional Diagram Charge Pump The MAX5394 contains an internal charge pump that guarantees the maximum wiper resistance, RWL, to be less than 50Ω (25Ω typ) for supply voltages down to 1.7V and allows pins H, W, and L to be driven between GND and 5.25V independent of VDD. Minimal charge-pump feedthrough is present at the terminal outputs and is illustrated by the Charge-Pump Feedthrough at W vs.
PAGE 12
MAX5394 Single, 256-Tap Volatile, SPI, Low-Voltage Linear Taper Digital Potentiometer Table 1.
PAGE 13
MAX5394 Single, 256-Tap Volatile, SPI, Low-Voltage Linear Taper Digital Potentiometer register to be written. A RST will also deassert shutdown mode and return the wiper to midscale (0x80). This command does not affect the charge-pump status. SD_L_ZERO Command Moves wiper to zero-scale position (0x00) and opens the L terminal. The wiper register remains unaltered. Writes cannot be made to the wiper register while shutdown mode is engaged.
PAGE 14
MAX5394 Single, 256-Tap Volatile, SPI, Low-Voltage Linear Taper Digital Potentiometer Ordering Information PIN-PACKAGE INTERFACE TAPS END-TO-END RESISTANCE (kΩ) MAX5394LATA+T 8 TDFN-EP* SPI 256 10 MAX5394MATA+T 8 TDFN-EP* SPI 256 50 MAX5394NATA+T 8 TDFN-EP* SPI 256 100 PART Note: All devices operate over the -40°C to +125°C temperature range. +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. Chip Information PROCESS: BiCMOS www.maximintegrated.
PAGE 15
MAX5394 Single, 256-Tap Volatile, SPI, Low-Voltage Linear Taper Digital Potentiometer Revision History REVISION NUMBER REVISION DATE 0 7/12 Initial release — 1 9/12 Revised the Absolute Maximum Ratings 2 2 10/14 Removed automotive reference from data sheet DESCRIPTION PAGES CHANGED 1, 11 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.