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19-5141; Rev 1; 4/10
TION KIT EVALUA BLE ILA AVA
Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometer
Features
S Dual, 256-Tap Linear Taper Positions S Single +2.6V to +5.5V Supply Operation S Low (< 1A) Quiescent Supply Current S 10kI, 50kI, 100kI End-to-End Resistance Values S Up/Down Interface S Power-On Sets Wiper to Midscale S -40C to +125NC Operating Temperature Range
General Description
The MAX5389 dual, 256-tap, volatile, low-voltage linear taper digital potentiometer offers three end-to-end resistance values of 10kI, 50kI, and 100kI. Operating from a single +2.6V to +5.5V power supply, the device provides a low 35ppm/NC end-to-end temperature coefficient. The MAX5389 features an up/down interface. The small package size, low supply operating voltage, low supply current, and automotive temperature range of the MAX5389 make the device uniquely suited for the portable consumer market, battery backup industrial applications, and the automotive market. The MAX5389 is specified over the automotive -40NC to +125NC temperature range and is available in a 14-pin TSSOP package.
MAX5389
Ordering Information
PART MAX5389LAUD+ PIN-PACKAGE 14 TSSOP 14 TSSOP 14 TSSOP END-TO-END RESISTANCE (kI) 10 50 100
Applications
Audio Mixing Mechanical Potentiometer Replacement Low-Drift Programmable Filters and Amplifiers Adjustable Voltage References/Linear Regulators Programmable Delays and Time Constants Automotive Electronics Low-Voltage Battery Applications
MAX5389MAUD+ MAX5389NAUD+
Note: All devices are specified over the -40NC to +125NC operating temperature range +Denotes a lead(Pb)-free/RoHS-compliant package.
Functional Diagram
VDD
CSA UDA INCA CSB UDB INCB
HA
WA
LA
MAX5389
LATCH U/D POR 256 DECODER HB WB LB LATCH 256 DECODER GND
_______________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometer MAX5389
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_ MAX5389L ......................................................................... Q5mA MAX5389M ........................................................................ Q2mA MAX5389N ........................................................................ Q1mA Continuous Power Dissipation (TA = +70NC) 14-Pin TSSOP (derate 10mW/NC above +70NC) ......796.8mW Operating Temperature Range ........................ -40NC to +125NC Junction Temperature .....................................................+150NC Storage Temperature Range............................ -65NC to +150NC Lead Temperature (soldering, 10s) ................................+300NC Soldering Temperature (reflow) ......................................+260NC
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VDD = +2.6V to +5.5V, VH__ = VDD, VL__ = GND, TA = -40NC to +125NC, unless otherwise noted. Typical values are at VDD = +5V, TA = +25NC.) (Note 1) PARAMETER Resolution Integral Nonlinearity Differential Nonlinearity Dual Code Matching Ratiometric Resistor Tempco Full-Scale Error SYMBOL N INL DNL (Note 2) (Note 2) Register A = register B (DVW/VW)/DT, no load MAX5389L Code = FFH MAX5389M MAX5389N MAX5389L Zero-Scale Error Code = 00H MAX5389M MAX5389N DC PERFORMANCE (Variable-Resistor Mode) (Note 3) MAX5389L VDD > +2.6V Integral Nonlinearity R-INL VDD > +4.75V Differential Nonlinearity R-DNL VDD 2.6V VDD > 2.6V VDD > 4.75V MAX5389M MAX5389N MAX5389L MAX5389M MAX5389N -0.5 250 150 10 50 35 -25 +25 DC PERFORMANCE (Resistor Characteristics) Wiper Resistance (Note 4) Terminal Capacitance Wiper Capacitance End-to-End Resistor Tempco End-to-End Resistor Tolerance RWL 600 200 I pF pF ppm/NC % 1.0 0.5 0.25 0.4 0.3 0.25 2.5 1.0 0.8 1.5 0.75 0.5 +0.5 LSB LSB -3 -1 -0.5 CONDITIONS MIN 256 -0.5 -0.5 -0.5 +5 -2.5 -0.5 -0.25 +2.5 +0.5 +0.25 +3 +1.0 +0.5 LSB LSB +0.5 +0.5 +0.5 TYP MAX UNITS Taps LSB LSB LSB LSB
DC PERFORMANCE (Voltage-Divider Mode)
CH_, CL__ Measured to GND Measured to GND CW_ TCR DRHL No load Wiper not connected
2
______________________________________________________________________________________
Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometer
ELECTRICAL CHARACTERISTICS (continued)
(VDD = +2.6V to +5.5V, VH__ = VDD, VL__ = GND, TA = -40NC to +125NC, unless otherwise noted. Typical values are at VDD = +5V, TA = +25NC.) (Note 1) PARAMETER AC PERFORMANCE Crosstalk -3dB Bandwidth Total Harmonic Distortion Plus Noise Wiper Settling Time (Note 6) POWER SUPPLIES Supply Voltage Range Standby Current DIGITAL INPUTS Minimum Input High Voltage Maximum Input Low Voltage Input Leakage Current Input Capacitance TIMING CHARACTERISTICS (Note 7) Maximum INC_ Frequency CS to INC_ Setup Time CS to INC_ Hold Time INC_ Low Period INC_ High Period UD_ to INC_ Setup Time UD_ to INC_ Hold Time fMAX tCI tIC tIL tIH tDI tID 25 0 25 25 50 0 10 MHz ns ns ns ns ns ns VIH VIL -1 5 70 30 +1 % x VDD % x VDD FA pF VDD Digital inputs = VDD or GND 2.6 1 5.5 V FA BW (Note 5) Code = 80H, 10pF load, MAX5389M VDD = +2.6V MAX5389N Measured at W, VH_ = 1VRMS at 1kHz MAX5389L tS MAX5389M MAX5389N MAX5389L -90 600 150 75 0.015 300 1000 2000 ns % kHz dB SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX5389
THD+N
Note 1: All devices are 100% production tested at TA = +25NC. Specifications over temperature limits are guaranteed by design and characterization. Note 2: DNL and INL are measured with the potentiometer configured as a voltage-divider (Figure 1) with H_ = VDD and L_ = 0V. The wiper terminal is unloaded and measured with a high-input-impedance voltmeter. Note 3: R-DNL and R-INL are measured with the potentiometer configured as a variable resistor (Figure 1). DNL and INL are measured with potentiometer configured as a variable resistor. H_ is unconnected and L_ = GND. For VDD = +5V, the wiper terminal is driven with a source current of 400A for the 10k configuration, 80A for the 50k configuration, and 40A for the 100k configuration. For VDD = +2.6V, the wiper terminal is driven with a source current of 200A for the 10k configuration, 40A for the 50k configuration, and 20A for the 100k configuration. Note 4: The wiper resistance is the worst value measured by injecting the currents given in Note 3 into W_ with L_ = GND. RW = (VW - VH)/IW. 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. Note 7: Digital timing is guaranteed by design and characterization, not production tested.
_______________________________________________________________________________________
3
Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometer MAX5389
H N.C.
W
W
L
L
Figure 1. Voltage-Divider and Variable Resistor Configurations
Typical Operating Characteristics
(VDD = +5V, TA = +25C, unless otherwise noted.)
SUPPLY CURRENT vs. TEMPERATURE
MAX5389 toc01
SUPPLY CURRENT vs. DIGITAL INPUT VOLTAGE
MAX5389 toc02
SUPPLY CURRENT vs. SUPPLY VOLTAGE
0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0
MAX5389 toc03
1.0 0.9 0.8
10,000 1000 SUPPLY CURRENT (A) 100 VDD = 2.6V 10 1 0.1 VDD = 5V
1.0
SUPPLY CURRENT (A)
0.7 0.6 0.5 0.4 0.3 0.2 0.1 0
VDD = 5V
VDD = 2.6V
IDD (A)
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (C)
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 DIGITAL INPUT VOLTAGE (V)
2.6
3.1
3.6
4.1 VDD (V)
4.6
5.1
RESISTANCE (W-TO-L) vs. TAP POSITION (10kI)
MAX5389 toc04
RESISTANCE (W-TO-L) vs. TAP POSITION (50kI)
MAX5389 toc05
RESISTANCE (W-TO-L) vs. TAP POSITION (100kI)
100 RESISTANCE (W-TO-L) (kI) 90 80 70 60 50 40 30 20 10 0
MAX5389 toc06
11 10 W-TO-L RESISTANCE (k) 9 8 7 6 5 4 3 2 1 0 0 51 102 153 TAP POSITION 204
55 50 W-TO-L RESISTANCE (k) 45 40 35 30 25 20 15 10 5 0
110
255
0
51
102 153 TAP POSITION
204
255
0
51
102
153
204
255
TAP POSITION
4
______________________________________________________________________________________
Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometer MAX5389
Typical Operating Characteristics (continued)
(VDD = +5V, TA = +25C, unless otherwise noted.)
WIPER RESISTANCE vs. WIPER VOLTAGE (10kI)
MAX5389 toc07
END-TO-END RESISTANCE % CHANGE vs. TEMPERATURE
10kI
MAX5389 toc08
VARIABLE-RESISTOR DNL vs. TAP POSITION (10kI)
0.08 0.06 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -0.10
IWIPER = 400A
190 WIPER RESISTANCE () 170 150 130 110 90 70 VDD = 5V
VDD = 2.6V
END-TO-END RESISTANCE % CHANGE
0 -0.1
50kI
-0.2 -0.3 -0.4 -0.5
100kI
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 WIPER VOLTAGE (V)
-40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (NC)
DNL (LSB)
0
51
102
153
204
255
TAP POSITION
VARIABLE-RESISTOR DNL vs. TAP POSITION (50kI)
MAX5389 toc10
VARIABLE-RESISTOR DNL vs. TAP POSITION (100kI)
MAX5389 toc11
VARIABLE-RESISTOR INL vs. TAP POSITION (10kI)
0.8 0.6 0.4 INL (LSB) 0.2 0 -0.2 -0.4 -0.6 -0.8 -1.0
0.08 0.06 0.04 DNL (LSB) 0 -0.02 -0.04 -0.06 -0.08 -0.10 0 0.02
IWIPER = 80A
0.08 0.06 0.04 DNL (LSB) 0.02 0 -0.02 -0.04 -0.06 -0.08 -0.10
IWIPER = 400A
IWIPER = 400A
51
102
153
204
255
0
51
102
153
204
255
0
51
102
153
204
255
TAP POSITION
TAP POSITION
TAP POSITION
VARIABLE-RESISTOR INL vs. TAP POSITION (50kI)
MAX5389 toc13
VARIABLE-RESISTOR INL vs. TAP POSITION (100kI)
MAX5389 toc14
VOLTAGE-DIVIDER DNL vs. TAP POSITION (10kI)
0.08 0.06 0.04 DNL (LSB) 0.02 0 -0.02 -0.04 -0.06 -0.08 -0.10
MAX5389 toc15
0.5 0.4 0.3 0.2 INL (LSB) 0 -0.1 -0.2 -0.3 -0.4 -0.5 0 0.1
IWIPER = 80A
0.5 0.4 0.3 0.2 INL (LSB) 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.5
IWIPER = 400A
0.10
51
102
153
204
255
0
51
102
153
204
255
0
51
102
153
204
255
TAP POSITION
TAP POSITION
TAP POSITION
_______________________________________________________________________________________
MAX5389 toc12
0.10
0.10
1.0
MAX5389 toc09
210
0.1
0.10
5
Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometer MAX5389
Typical Operating Characteristics (continued)
(VDD = +5V, TA = +25C, unless otherwise noted.)
VOLTAGE-DIVIDER DNL vs. TAP POSITION (50kI)
MAX5389 toc16
VOLTAGE-DIVIDER DNL vs. TAP POSITION (100kI)
MAX5389 toc17
VOLTAGE-DIVIDER INL vs. TAP POSITION (10kI)
0.4 0.3 0.2 INL (LSB) 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.5
MAX5389 toc18
0.10 0.08 0.06 0.04 DNL (LSB) 0 -0.02 -0.04 -0.06 -0.08 -0.10 0 51 102 153 204 0.02
0.10 0.08 0.06 0.04 DNL (LSB) 0.02 0 -0.02 -0.04 -0.06 -0.08 -0.10
0.5
255
0
51
102
153
204
255
0
51
102
153
204
255
TAP POSITION
TAP POSITION
TAP POSITION
VOLTAGE-DIVIDER INL vs. TAP POSITION (50kI)
MAX5389 toc19
VOLTAGE-DIVIDER INL vs. TAP POSITION (100kI)
MAX5389 toc20
TAP-TO-TAP SWITCHING TRANSIENT (CODE 127 TO 128) 10kI
0.5 0.4 0.3 0.2 INL (LSB) 0 -0.1 -0.2 -0.3 -0.4 -0.5 0 51 102 153 204 0.1
0.5 0.4 0.3 0.2 INL (LSB) 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.5
MAX5389 toc21
VW-L 20mV/div
INC 5V/div
255
0
51
102
153
204
255
400ns/div
TAP POSITION
TAP POSITION
6
______________________________________________________________________________________
Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometer
Typical Operating Characteristics (continued)
(VDD = +5V, TA = +25C, unless otherwise noted.)
MAX5389
TAP-TO-TAP SWITCHING TRANSIENT (CODE 127 TO 128) 50kI
MAX5389 toc22
TAP-TO-TAP SWITCHING TRANSIENT (CODE 127 TO 128) 100kI
VW-L 20mV/div
MAX5389 toc23
POWER-ON WIPER TRANSIENT (CODE 0 TO 128)
VW-L 20mV/div
MAX5389 toc24
OUTPUT W 2V/div
INC 5V/div
INC 5V/div 1s/div 2s/div
VDD 2V/div
400ns/div
MIDSCALE FREQUENCY RESPONSE
MAX5389 toc25
CROSSTALK vs. FREQUENCY
MAX5389 toc26
TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY
0.12 0.10 THD+N (%) 0.08 0.06 0.04 0.02 0 0.01 0.10 1 FREQUENCY (kHz) 10 100
MAX5389 toc27
10
VIN = 1VP-P CW = 10pF
0 -20 CROSSTALK (dB) -40 -60 -80 -100
0.14
0 GAIN (dB)
MAX5389M
MAX5389L
-10
MAX5389L MAX5389M
MAX5389N
-20
MAX5389N
-30 0.01 0.1 1 10 100 1,000 10,000 FREQUENCY (kHz)
-120 -140 0.01 0.1 1
MAX5389N MAX5389M
MAX5389L
10
100
1000
FREQUENCY (kHz)
_______________________________________________________________________________________
7
Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometer MAX5389
Pin Configuration
TOP VIEW
CSA 1 UDA 2 UDB 3 VDD 4 WA 5 HA 6 LA 7
+
14 CSB 13 INCA 12 INCB
MAX5389
11 GND 10 WB 9 HB 8 LB
Pin Description
PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 NAME CSA UDA UDB VDD WA HA LA LB HB WB GND INCB INCA CSB FUNCTION Active-Low Register A Chip-Select Input. Drive CSA low to change wiper position WA through INCA and UDA. Register A Up/Down Control Input. With UDA low, a high-to-low transition at INCA decrements the WA position towards LA. With UDA high, a high-to-low transition at INCA increments WA position toward HA. Register B Up/Down Control Input. With UDB low, a high-to-low transition at INCB decrements the WB position towards LB. With UDB high, a high-to-low transition at INCB increments WB position toward HB. Power-Supply Input. Bypass VDD to GND with a 0.1FF capacitor close to the device. Resistor A Wiper Terminal 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. Resistor A Low Terminal. The voltage at LA can be higher or lower than the voltage at HA. Current can flow into or out of LA. Resistor B Low Terminal. The voltage at LB can be higher or lower than the voltage at HB. Current can flow into or out of LB. Resistor B High Terminal. The voltage at HB can be higher or lower than the voltage at LB. Current can flow into or out of HB. Resistor B Wiper Terminal Ground Register B Wiper Increment Control Input. With UDB low, a high-to-low transition at INCB decrements the WB position towards LB. With UDB high, a high-to-low transition at INCB increments WB position toward HB. Register A Wiper Increment Control Input. With UDA low, a high-to-low transition at INCA decrements the WA position towards LA. With UDA high, a high-to-low transition at INCA increments WA position toward HA. Active-Low Register B Chip-Select Input. Drive CSB low to change wiper position WA through INCB and UDB.
8
______________________________________________________________________________________
Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometer
Detailed Description
The MAX5389 dual, 256-tap, volatile, low-voltage linear taper digital potentiometer offers three end-to-end resistance values of 10kI, 50kI, and 100kI. 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. On power-up, the wiper position is set to midscale (tap 128). The potentiometers are programmable independent of each other. The MAX5389 features an up/down interface. Logic inputs CS_, UD_, and INC_ determine the wiper position of the device (Table 1). With CS_ low and UD_ high, a high-to-low (falling edge) transition on INC_ increments the internal counter which moves the wiper, W_, closer to H_. When both CS_ and UD_ are low, the falling edge of INC_ decrements the internal counter and moves the tap point, W_ closer to L_, (Figure 2). The wiper performs a make-before-break transition ensuring that W_ is never disconnected from the resistor string during a transition from one tap point to another. When the wiper is at either end of the resistor array additional transitions in the direction of the end point do not change the counter value.
MAX5389
Table 1. Up/Down Control Table
CS_ H L L L L UD_ X L H L H INC_ X a a a a W_ No change No change No change Decrement Increment
Up/Down Interface
X = Don't care. = Low-to-high transition. = High-to-low transition.
CS_
tCI
INC_
tIL
tIC
tIH tDI
UD_
tID
tIW
W_
Figure 2. Up/Down Interface Timing Diagram
_______________________________________________________________________________________
9
Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometer MAX5389
Applications Information
Figure 3 shows a potentiometer adjusting the gain of a noninverting amplifier. Figure 4 shows a potentiometer adjusting the gain of an inverting amplifier.
Variable Gain Amplifier
Figure 5 shows an adjustable dual linear regulator using a dual potentiometer as two variable resistors. Figure 6 shows an adjustable voltage reference circuit using a potentiometer as a voltage-divider.
Adjustable Dual Linear Regulator
Adjustable Voltage Reference
OUT1 OUT2 VIN VOUT V+ IN H H
VOUT1 VOUT2
MAX8866
W SET1 SET2 L L W
W L H
Figure 3. Variable Gain Noninverting Amplifier
Figure 5. Adjustable Dual Linear Regulator
+5V H W VIN VOUT GND L L IN OUT H W VREF
MAX6160
Figure 4. Variable Gain Inverting Amplifier
Figure 6. Adjustable Voltage Reference
10
_____________________________________________________________________________________
Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometer
Figure 7 shows a variable gain current to voltage converter using a potentiometer as a variable resistor.
Variable Gain Current to Voltage Converter
Figure 10 shows a programmable filter using a dual potentiometer.
Programmable Filter
MAX5389
Figure 8 shows a positive LCD bias control circuit using a potentiometer as a voltage-divider. Figure 9 shows a positive LCD bias control circuit using a potentiometer as a variable resistor
LCD Bias Control
Figure 11 shows an offset voltage adjustment circuit using a dual potentiometer.
Offset Voltage Adjustment Circuit
R3 H W
IS
+5V
R1 L
R2
H W
VOUT
VOUT
L
VOUT = IS x ((R3 x (1 + R2/R1)) + R2)
Figure 7. Variable Gain I-to-V Converter
Figure 9. Positive LCD Bias Control Using a Variable Resistor
WB
+5V H W
VOUT
VIN
LB HB R3
VOUT
R1 HA R2 LA
L
WA
Figure 8. Positive LCD Bias Control Using a Voltage-Divide
Figure 10. Programmable Filter
______________________________________________________________________________________
11
Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometer MAX5389
+5V WA HA LA
Process Information
PROCESS: BiCMOS
Package Information
VOUT
HB
For the latest package outline information and land patterns, go to www.maxim-ic.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 U14+1 DOCUMENT NO. 21-0066 14 TSSOP
WB LB
Figure 11. Offset Voltage Adjustment Circuit
12
_____________________________________________________________________________________
Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometer
Revision History
REVISION NUMBER 0 1 REVISION DATE 1/10 4/10 Initial release Added Soldering Temperature in Absolute Maximum Ratings; corrected code in Conditions of -3dB Bandwidth specification in Electrical Characteristics; corrected Table 1 and Figure 5 DESCRIPTION PAGES CHANGED -- 2, 3, 9, 10
MAX5389
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
(c)
13
2010 Maxim Integrated Products
Maxim is a registered trademark of Maxim Integrated Products, Inc.

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