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19-1956; Rev 3; 11/05
32-Tap FleaPoT TM, 2-Wire Digital Potentiometers
General Description
The MAX5460-MAX5468 linear-taper digital potentiometers perform the same function as a mechanical potentiometer or a variable resistor. These devices consist of a fixed resistor and a wiper contact with 32-tap points that are digitally controlled through a 2-wire serial interface. The MAX5462/MAX5465/MAX5468 are configured as potentiometers. The rest of the devices in this family are configured as variable resistors. See Pin Configurations for part functionality. Three resistance values are available: 10k (MAX5466/ MAX5467/MAX5468), 50k (MAX5463/MAX5464/ MAX5465), and 100k (MAX5460/MAX5461/MAX5462). The MAX5460-MAX5465 (100k and 50k) are available in space-saving 5-pin and 6-pin SC70 packages. The MAX5466/MAX5467/MAX5468 (10k) are available in 5-pin and 6-pin SOT23 packages. 0.3A Ultra-Low Supply Current +2.7V to +5.5V Single-Supply Operation Glitchless Switching Between Resistor Taps Power-On Reset to Midscale 2-Wire Up/Down Serial Interface 10k, 50k, and 100k Resistance Values
Features
Miniature SC70 and SOT23 Packages
MAX5460-MAX5468
Applications
LCD Screen Adjustment Volume Control Mechanical Potentiometer Replacement Gain Adjustment Line Impedance Matching
MAX5460EXK MAX5461EXT MAX5462EXT MAX5463EXK MAX5464EXT MAX5465EXT MAX5466EUK MAX5467EUT MAX5468EUT PART
Ordering Information
PINPACKAGE 5 SC70 6 SC70 6 SC70 5 SC70 6 SC70 6 SC70 5 SOT23 6 SOT23 6 SOT23 TOP MARK ACA AAP AAQ ACB AAR AAS ADQQ AARH AARI R (k) 100 100 100 50 50 50 10 10 10 PKG CODE X5-1 X6S-1 X6S-1 X5-1 X6S-1 X6S-1 U5-1 U6-1 U6-1
FleaPoT is a trademark of Maxim Integrated Products Inc. Functional Diagram appears at end of data sheet.
Note: All devices operate over the -40C to +85C temperature range.
Pin Configurations
TOP VIEW
VDD 1
5
H
VDD 1
6
H
VDD 1
6
H
GND 2
GND 2
5
L
GND 2
5
W
U/D 3
MAX5460 MAX5463 MAX5466 SOT23, SC70
4
CS
U/D 3
MAX5461 MAX5464 MAX5467 SOT23, SC70
4
CS
U/D 3
MAX5462 MAX5465 MAX5468 SOT23, SC70
4
CS
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
32-Tap FleaPoT TM, 2-Wire Digital Potentiometers MAX5460-MAX5468
ABSOLUTE MAXIMUM RATINGS
VDD to GND ..............................................................-0.3V to +6V All Other Pins to GND.................................-0.3V to (VDD + 0.3)V Input and Output Latch-Up Immunity.............................200mA Maximum Continuous Current into H, L, and W MAX5460/MAX5461/MAX5462 (100k) .......................0.6mA MAX5463/MAX5464/MAX5465 (50k) .........................1.3mA MAX5466/MAX5467/MAX5468 (10k) .........................1.3mA Continuous Power Dissipation (TA = +70C) 5-pin SC70 (derate 3.1mW/C above TA = +70C)..........247mW 5-pin SOT23 (derate 7.1mW/C above TA = +70C)........571mW 6-pin SC70 (derate 3.1mW/C above TA = +70C) ..........245mW 6-pin SOT23 (derate 8.7mW/C above TA = +70C).....695.7mW Operating Temperature Range ...........................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Soldering Temperature (soldering, 10s) ..........................+300C
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
(V DD = +2.7V to +5.5V, V H = V DD, V L = 0, T A = -40C to +85C. Typical values are at V DD = +2.7V, T A = +25C, unless otherwise noted.)
PARAMETER DC PERFORMANCE Resolution MAX5460/MAX5461/MAX5462 End-to-End Resistance End-to-End Resistance Tempco Ratiometric Resistance Tempco Integral Nonlinearity Differential Nonlinearity Full-Scale Error Zero-Scale Error Wiper Resistance DIGITAL INPUTS Input High Voltage Input Low Voltage U/D Mode to CS Setup CS to U/D Step Setup CS to U/D Step Hold U/D Step Low Period U/D Step High Period Up/Down Toggle Rate (Note 1) Output Settling Time (Note 2) VIH VIL tCU tCI tIC tIL tIH fTOGGLE tSETTLE 100k variable resistor configuration, CL = 10pF 100k potentiometer configuration, CL = 10pF 25 50 25 25 25 1 1 0.25 0.7 x VDD 0.3 x VDD V V ns ns ns ns ns MHz s RW MAX5462/MAX5465 MAX5468 600 160 INL DNL 0.1 1 1200 240 TCR MAX5463/MAX5464/MAX5465 MAX5466/MAX5467/MAX5468 32 75 37.5 7.5 100 50 10 35 5 0.5 1 1 125 62.5 12.5 ppm/C ppm/C LSB LSB LSB LSB k Taps SYMBOL CONDITIONS MIN TYP MAX UNITS
TIMING CHARACTERISTICS (Figures 1, 2)
2
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32-Tap FleaPoT TM, 2-Wire Digital Potentiometers
ELECTRICAL CHARACTERISTICS (continued)
(V DD = +2.7V to +5.5V, V H = V DD, V L = 0, T A = -40C to +85C. Typical values are at V DD = +2.7V, T A = +25C, unless otherwise noted.)
PARAMETER POWER SUPPLIES Supply Voltage Active Supply Current (Note 3) Standby Supply Current (Note 4) VDD IDD ISD VDD = +5V 0.3 2.7 5.5 25 1 V A A SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX5460-MAX5468
Note 1: Up/Down Toggle Rate:
fTOGGLE =
1 t SETTLE
Note 2: Typical settling times are dependent on end-to-end resistance. Note 3: Supply current taken while changing wiper tap, fTOGGLE = 1MHz. Note 4: Supply current taken while wiper position is fixed.
Typical Operating Characteristics
(TA = +25C, unless otherwise noted.)
WIPER RESISTANCE vs. WIPER VOLTAGE (MAX5460-MAX5465)
MAX5460 toc01
WIPER RESISTANCE vs. WIPER VOLTAGE (MAX5466/MAX5467/MAX5468)
MAX5460 toc02
END-TO-END RESISTANCE % CHANGE vs. TEMPERATURE
END-TO-END RESISTANCE % CHNAGE
MAX5460 toc03
700 600 WIPER RESISTANCE () 500 400 300 200 100 0 0 VDD = +5V VDD = +2.7V
200 180 160 WIPER RESISTANCE () 140 120 100 80 60 40 20 0 VDD = +5V VDD = +2.7V
0.10 0.05 0 -0.05 -0.10 -0.15 -0.20 -0.25 50k, 100k 10k
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 WIPER VOLTAGE (V)
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
-15
10
35
60
85
TEMPERATURE (C)
W-TO-L RESISTANCE vs. TAP POSITION
MAX5460 toc04
SUPPLY CURRENT vs. TEMPERATURE
0.45 0.40 0.35 CURRENT (A) 0.30 0.25 0.20 0.15 0.10 VDD = +2.7V OUTPUT W 100mV/div 60 85 VDD = +5V
MAX5460 toc05
TAP-TO-TAP SWITCHING TRANSIENT (MAX5460)
MAX5460 toc06
120 100 RESISTANCE (k) 100k 80 60 50k 40 20 0 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 TAP POSITION
0.50
U/D 2V/div
10k
0.05 0.00 -40 -15 10 35
200ns/div
TEMPERATURE (C)
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3
32-Tap FleaPoT TM, 2-Wire Digital Potentiometers MAX5460-MAX5468
Typical Operating Characteristics (continued)
(TA = +25C, unless otherwise noted.)
R-DNL ERROR vs. INPUT CODE (100k)
MAX5460 toc07
R-INL ERROR vs. INPUT CODE (100k)
MAX5460 toc08
R-DNL ERROR vs. INPUT CODE (50k)
0.02 0 R-DNL (LSB) -0.02 -0.04 -0.06 -0.08 -0.10 -0.12 -0.14
MAX5460 toc09
0.08 0.06 0.04 R-DNL (LSB) 0.02 0 -0.02 -0.04 -0.06 -0.08 -0.10 0 5 10 15 20 25 30 INPUT CODE (DECIMAL)
0.10 0.08 0.06 0.04 R-INL (LSB) 0.02 0 -0.02 -0.04 -0.06 -0.08 -0.10 0 5 10 15 20 25 30 INPUT CODE (DECIMAL)
0.04
0
5
10
15
20
25
30
INPUT CODE (DECIMAL)
R-INL ERROR vs. INPUT CODE (50k)
MAX5460 toc10
R-DNL ERROR vs. INPUT CODE (10k)
MAX5460 toc11
R-INL ERROR vs. INPUT CODE (10k)
0.25 0.20 R-INL (LSB) 0.15 0.10 0.05 0 -0.05 -0.10 -0.15
MAX5460 toc12
0.20 0.15 0.10
0.15 0.10 0.05 R-DNL LSB
0.30
R-INL LSB
0 -0.05 -0.10 -0.15
0.05 0
-0.05 -0.10 0 5 10 15 20 25 30 INPUT CODE (DECIMAL)
-0.20 -0.25 0 5 25 20 INPUT CODE (DECIMAL) 10 15 30
0
5
10
15
20
25
30
INPUT CODE (DECIMAL)
Pin Description
PIN MAX5460 MAX5463 MAX5466 1 2 3 MAX5461 MAX5464 MAX5467 1 2 3 MAX5462 MAX5465 MAX5468 1 2 3 NAME FUNCTION
VDD GND U/D
Power Supply Ground Up/Down Control Input. With CS low, a low-to-high transition increments or decrements the wiper position. Chip Select Input. A high-to-low CS transition determines the mode: increment if U/D is high, or decrement if U/D is low. High Terminal of Resistor Low Terminal of Resistor Wiper Terminal of Resistor
4 5 -- --
4 6 5 --
4 6 -- 5
CS H L W
4
_______________________________________________________________________________________
32-Tap FleaPoT TM, 2-Wire Digital Potentiometers
Detailed Description
The MAX5460-MAX5468 consist of a fixed resistor and a wiper contact with 32-tap points that are digitally controlled through a 2-wire serial interface. Three resistance values are available: 10k (MAX5466/MAX5467/ MAX5468), 50k (MAX5463/MAX5464/MAX5465), and 100k (MAX5460/MAX5461/MAX5462). The MAX5462/MAX5465/MAX5468 are designed to operate as potentiometers. In this configuration, the low terminal of the resistor array is connected to ground (pin 2). The MAX5461/MAX5464/MAX5467 perform as variable resistors. In these devices, the wiper terminal and high terminal of the resistor array are connected at pin 5. The MAX5460/MAX5463/MAX5466 are similar variable resistors, except the low terminal is connected to ground (pin 2).
Digital Interface Operation
The MAX5460-MAX5468 have two modes of operation when the serial interface is active: increment and decrement mode. The serial interface is only active when CS is low. The CS and U/D inputs control the position of the wiper along the resistor array. When CS transitions from high to low, the part will go into increment mode if U/D is high, and into decrement mode if U/D is low. Once the mode is set, the device will remain in that mode until CS goes high again. A low-to-high transition at the U/D pin will increment or decrement the wiper position depending on the current mode (Figures 1 and 2). When the CS input transitions to high (serial interface inactive), the value of the counter is stored and the wiper position is maintained. Note that when the wiper reaches the maximum (or minimum) tap position, the wiper will not wrap around to the minimum (or maximum) position.
MAX5460-MAX5468
CS
tCU tIL U/D tCI tSETTLE W tIH tSETTLE
tIC
NOTE: "W" IS NOT A DIGITAL SIGNAL. IT REPRESENTS WIPER TRANSITIONS.
Figure 1. Serial Interface Timing Diagram, Increment Mode
CS
tCU tIH U/D
tIC
tIL tCI W tSETTLE
tSETTLE
NOTE: "W" IS NOT A DIGITAL SIGNAL. IT REPRESENTS WIPER TRANSITIONS.
Figure 2. Serial Interface Timing Diagram, Decrement Mode _______________________________________________________________________________________ 5
32-Tap FleaPoT TM, 2-Wire Digital Potentiometers MAX5460-MAX5468
Power-On Reset
All parts in this family feature power-on reset (POR) circuitry that sets the wiper position to midscale at powerup. By default, the chip is in the increment mode.
Alternative Positive LCD Bias Control
Alternatively, use an op amp to provide buffering and gain to the output of the MAX5462/MAX5465/MAX5468. Connect the mechanical potentiometer to the positive input of a noninverting op amp (Figure 5) to select a portion of the input signal by digitally controlling the wiper terminal. Figure 6 shows a similar circuit for the MAX5461/MAX5464/MAX5467.
Applications Information
The MAX5460-MAX5468 are intended for circuits requiring digitally controlled adjustable resistance, such as LCD contrast control, where voltage biasing adjusts the display contrast.
Adjustable Gain
Figure 7 shows how to use the variable resistor to digitally adjust the gain of a noninverting op amp configuration. Connect the MAX5461/MAX5464/MAX5467 in series with a resistor to ground to form the adjustable gain control of a noninverting amplifier. The MAX5460- MAX5468 have a low 5ppm/C ratiometric tempco that allows for a very stable adjustable gain configuration over temperature.
Controlling a Switch-Mode LCD Bias Generator
Figure 3 shows an application where the variable resistor is used with a MAX1771 to make an adjustable positive LCD-bias circuit. The output of the MAX1771 is a positive voltage that is digitally controlled through the MAX5461/MAX5464/MAX5467. Similarly, Figure 4 shows the application of the variable resistor in a digitally controlled negative LCD-bias circuit along with the MAX774/MAX775/MAX776.
VIN = 5V C1 68F C2 0.1F 2 V+ 5 REF C3 0.1F 4 SHDN 6 AGND
MAX1771
VIN C1 150F L1 22H D1 1N5817-22 N MTD20N03HDL RSENSE 40m C4 300F MAX5461 MAX5464 MAX5467 R2 RVAR C5 MAX5461 MAX5464 MAX5467 RVAR R1 1N5822/ MBR340 REF GND 8 L1 22H C4* VOUT = 12V AT 0.5A C2 0.1F R2 1 OUT 3 2 FB MAX774 MAX775 MAX776 SHDN V+ 5 R3 0.07 CS 6 EXT 7 Q1 Si9435 P
EXT
1
VOUT
CS
8
FB GND 7
3
4 C3 0.1F
R1
VREF = 1.5V VOUT(MAX) R2 = +1 R1 VREF VOUT(MIN) R2 = R1 + RVAR(MAX) VREF
* MAX774 = 330F, 10V
MAX775/MAX776 = 120F, 20V VOUT(MAX) R2 VOUT(MIN) R2 = , = R1 VREF R1 + RVAR VREF
(
)
+1
VREF - VFB 5A (FOR 2% GAIN-SETTING ACCURACY) R1 + RVAR
Figure 3. Adjustable Positive LCD Bias
Figure 4. Adjustable Negative LCD Bias
6
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32-Tap FleaPoT TM, 2-Wire Digital Potentiometers MAX5460-MAX5468
+5V +5V H 30V W L MAX5462 MAX5465 MAX5468 MAX5461 MAX5464 MAX5467 30V
H
VOUT L
VOUT
Figure 5. Positive LCD Bias Control
VCC VIN VOUT
Figure 6. Positive LCD Bias Control
VCC VIN VOUT
H W L MAX5461 MAX5464 MAX5467 MAX5462 MAX5465 MAX5468 a) b) H
L
Figure 7. Adjustable Gain Circuit
_______________________________________________________________________________________
7
32-Tap FleaPoT TM, 2-Wire Digital Potentiometers MAX5460-MAX5468
Functional Diagram
H VDD GND
MAX5460-MAX5468
CS U/D
UP/DN COUNTER
32-POSITION DECODER
W
L
Chip Information
TRANSISTOR COUNT: 792
8
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32-Tap FleaPoT TM, 2-Wire Digital Potentiometers
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.)
SC70, 5L.EPS
MAX5460-MAX5468
PACKAGE OUTLINE, 5L SC70
21-0076
C
1 1
PACKAGE OUTLINE, SOT-23, 5L
21-0057
E
1 1
_______________________________________________________________________________________
SOT-23 5L .EPS
9
32-Tap FleaPoT TM, 2-Wire Digital Potentiometers MAX5460-MAX5468
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.)
6LSOT.EPS
PACKAGE OUTLINE, SOT 6L BODY
21-0058
G
1 1
PACKAGE OUTLINE, 6L SC70
21-0077
C
1 1
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.
10 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.
SC70, 6L.EPS

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