Datasheet

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

General Description

The MAX5387 dual, 256-tap, volatile, low-voltage linear

taper digital potentiometer offers three end-to-end resis-

tance values of 10kΩ, 50kΩ, and 100kΩ. Operating from

a single +2.6V to +5.5V power supply, the device provides

a low 35ppm/ºC end-to-end temperature coefficient. The

device features an I

C interface.

The small package size, low supply operating voltage,

low supply current, and automotive temperature range of

the MAX5387 make the device uniquely suitable for the

portable consumer market and battery-backup industrial

applications.

The MAX5387 is specified over the automotive -40ºC to

+125ºC temperature range and is available in a 14-pin

TSSOP package.

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

● I

C-Compatible Interface

● Power-On Sets Wiper to Midscale

● -40ºC to + 125ºC Operating Temperature Range

19-5140; Rev 3; 9/14

Note: All devices are specified over the -40ºC to +125ºC oper-

ating temperature range.

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

PART PIN-PACKAGE

END-TO-END

RESISTANCE (kΩ)

MAX5387LAUD+ 14 TSSOP 10

MAX5387MAUD+ 14 TSSOP 50

MAX5387NAUD+ 14 TSSOP 100

LATCH

GND

256 DECODER

HA LA

LATCH

POR

SCL

SDA

MAX5387

MAX5387 Dual, 256-Tap, Volatile, Low-Voltage

Linear Taper Digital Potentiometer

Functional Diagram

Ordering Information

EVALUATION KIT AVAILABLE

Summary of content (15 pages)

PAGE 1
EVALUATION KIT AVAILABLE MAX5387 Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometer General Description Features The MAX5387 dual, 256-tap, volatile, low-voltage linear taper digital potentiometer offers three end-to-end resistance values of 10kΩ, 50kΩ, and 100kΩ. Operating from a single +2.6V to +5.5V power supply, the device provides a low 35ppm/ºC end-to-end temperature coefficient. The device features an I2C interface. ●● Dual, 256-Tap Linear Taper Positions ●● Single +2.
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MAX5387 Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometer 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 into H_, W_, and L_ MAX5387L.......................................................................±5mA MAX5387M...........
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MAX5387 Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometer Electrical Characteristics (continued) (VDD = +2.6V to +5.5V, VH_ = VDD, VL_ = GND, TA = -40ºC to +125ºC, unless otherwise noted. Typical values are at VDD = +5V, TA = +25ºC.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS AC PERFORMANCE Crosstalk -3dB Bandwidth Total Harmonic Distortion Plus Noise Wiper Settling Time (Note 6) (Note 5) BW THD+N tS Code = 80H, 10pF load, VDD = +2.
PAGE 4
MAX5387 Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometer Electrical Characteristics (continued) Note 5: Drive HA with a 1kHz GND to VDD amplitude tone. LA = LB = GND. No load. WB is at midscale with a 10pF load. Measure WB. Note 6: The wiper settling time is the worst-case 0 to 50% rise time, measured between tap 0 and tap 127. H_ = VDD, L_ = GND, and the wiper terminal is loaded with 10pF capacitance to ground.
PAGE 5
MAX5387 Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometer Typical Operating Characteristics (continued) (VDD = 5V, TA = +25°C, unless otherwise noted.) VDD = 5V 110 90 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 WIPER VOLTAGE (V) IWIPER = 80µA 0.08 -0.3 0 -0.02 -0.04 -0.06 -0.4 -0.08 -0.10 -40 -25 -10 5 20 35 50 65 80 95 110 125 VARIABLE-RESISTOR DNL vs. TAP POSITION (100kΩ) IWIPER = 400µA 0.08 0.06 INL (LSB) DNL (LSB) 0.2 0 -0.02 -0.04 -0.4 -0.06 -0.6 -0.08 -0.
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MAX5387 Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometer Typical Operating Characteristics (continued) (VDD = 5V, TA = +25°C, unless otherwise noted.) 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 -0.10 0 102 153 204 255 102 153 204 255 -0.5 0 51 102 153 204 255 TAP POSITION VOLTAGE-DIVIDER INL vs. TAP POSITION (50kΩ) VOLTAGE-DIVIDER INL vs.
PAGE 7
MAX5387 Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometer Typical Operating Characteristics (continued) (VDD = 5V, TA = +25°C, unless otherwise noted.) MAX5387 toc24 10 MIDSCALE FREQUENCY RESPONSE MAX5387 toc25 MAX5387 POWER-ON WIPER TRANSIENT (CODE 0 TO 128) VIN = 1VP-P CW = 10pF GAIN (dB) 0 OUTPUT W 2V/div VDD 2V/div MAX5387L -10 MAX5387M -20 MAX5387N -30 2µs/div 0.01 0.1 1 10 100 1,000 10,000 FREQUENCY (kHz) TOTAL HARMONIC DISTORTION PLUS NOISE vs.
PAGE 8
MAX5387 Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometer Pin Configuration TOP VIEW HA 1 + 14 VDD 13 SCL WA 2 LA 3 MAX5387 12 SDA HB 4 11 A0 WB 5 10 A1 LB 6 9 A2 I.C. 7 8 GND TSSOP Pin Description PIN NAME 1 HA Resistor A High Terminal. The voltage at HA can be higher or lower than the voltage at LA. Current can flow into or out of HA. 2 WA Resistor A Wiper Terminal 3 LA Resistor A Low Terminal.
PAGE 9
MAX5387 Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometer Detailed Description The MAX5387 dual, 256-tap, volatile, low-voltage linear taper digital potentiometer offers three end-to-end resistance values of 10kΩ, 50kΩ, and 100kΩ. The potentiometer consists of 255 fixed resistors in series between terminals H_ and L_. The potentiometer wiper, W_, is programmable to access any one of the 256 tap points on the resistor string.
PAGE 10
MAX5387 Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometer Bit Transfer One data bit is transferred during each clock pulse. The data on the SDA line must remain stable while SCL is high. See Figure 4. Acknowledge The acknowledge bit is a clocked 9th bit that the recipient uses to handshake receipt of each byte of data. See Figure 5. Each byte transferred requires a total of nine bits.
PAGE 11
MAX5387 SDA Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometer 0 1 0 1 A2 A1 A0 MSB START NOP/W ACK LSB SCL Figure 6. Slave Address ACKNOWLEDGE HOW CONTROL BYTE AND DATA BYTE MAP INTO DEVICE REGISTERS R7 R6 R5 R4 R3 R2 R1 R0 D7 D6 D5 D4 D3 D2 D1 D0 ACKNOWLEDGE S 0 A SLAVE ADDRESS A A COMMAND BYTE P 1 DATA BYTE NOP/W Figure 7.
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MAX5387 Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometer Table 2. I2C Command Byte Summary COMMAND BYTE 3 4 5 6 7 8 A6 A5 A4 A3 A2 A1 A0 W REG A 0 1 0 1 A2 A1 A0 REG B 0 1 0 1 A2 A1 A0 0 1 0 1 A2 A1 A0 SCL CYCLE NO.
PAGE 13
MAX5387 Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometer Variable Gain Current to Voltage Converter Programmable Filter LCD Bias Control Offset-Voltage Adjustment Circuit Figure 12 shows a variable gain current to voltage converter using a potentiometer as a variable resistor. Figure 13 shows a positive LCD bias control circuit using a potentiometer as a voltage-divider. Figure 15 shows a programmable filter using a dual potentiometer.
PAGE 14
MAX5387 Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometer +5V WA WB HB LA HA LB VIN VOUT R3 VOUT R1 HA WA HB R2 WB LA LB Figure 15. Programmable Filter Figure 16. Offset-Voltage Adjustment Circuit Chip Information Package Information PROCESS: BiCMOS www.maximintegrated.com 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.
PAGE 15
MAX5387 Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometer Revision History REVISION NUMBER REVISION DATE PAGES CHANGED 0 1/10 Initial release — 1 4/10 Added Soldering Temperature in Absolute Maximum Ratings; corrected code in Conditions of -3dB Bandwidth specification in Electrical Characteristics 2 2 11/10 Updated figures for optimal circuit operation 3 9/14 Removed automotive references from data sheet DESCRIPTION 12, 13, 14 1 For pricing, delivery, and ordering