General Description
The MAX5460–MAX5468 linear-taper digital potentiome-
ters perform the same function as a mechanical poten-
tiometer 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: 10kΩ(MAX5466/
MAX5467/MAX5468), 50kΩ(MAX5463/MAX5464/
MAX5465), and 100kΩ(MAX5460/MAX5461/MAX5462).
The MAX5460–MAX5465 (100kΩand 50kΩ) are avail-
able in space-saving 5-pin and 6-pin SC70 packages.
The MAX5466/MAX5467/MAX5468 (10kΩ) are available
in 5-pin and 6-pin SOT23 packages.
Applications
LCD Screen Adjustment
Volume Control
Mechanical Potentiometer Replacement
Gain Adjustment
Line Impedance Matching
Features
♦Miniature SC70 and SOT23 Packages
♦0.3µA 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
♦10kΩ, 50kΩ, and 100kΩResistance Values
MAX5460–MAX5468
32-Tap FleaPoT™, 2-Wire Digital
Potentiometers
________________________________________________________________ Maxim Integrated Products 1
TOP VIEW
GND
CSU/D
15HVDD
MAX5460
MAX5463
MAX5466
SOT23, SC70
2
34
GND
CSU/D
16HVDD
MAX5461
MAX5464
MAX5467
SOT23, SC70
2
34
L5GND
CSU/D
16HVDD
MAX5462
MAX5465
MAX5468
SOT23, SC70
2
34
W5
Pin Configurations
Ordering Information
19-1956; Rev 2; 9/02
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.
Functional Diagram appears at end of data sheet.
PART TEMP
RANGE
PIN-
PACKAGE
TOP
MARK R (kΩ)
MAX5460EXK -40°C to +85°C 5 SC70 ACA 100
MAX5461EXT -40°C to +85°C 6 SC70 AAP 100
MAX5462EXT -40°C to +85°C 6 SC70 AAQ 100
MAX5463EXK -40°C to +85°C 5 SC70 ACB 50
MAX5464EXT -40°C to +85°C 6 SC70 AAR 50
MAX5465EXT -40°C to +85°C 6 SC70 AAS 50
MAX5466EUK -40°C to +85°C 5 SOT23 ADQQ 10
MAX5467EUT -40°C to +85°C 6 SOT23 AARH 10
MAX5468EUT -40°C to +85°C 6 SOT23 AARI 10
FleaPoT is a trademark of Maxim Integrated Products Inc.
MAX5460–MAX5468
32-Tap FleaPoT™, 2-Wire Digital
Potentiometers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VDD = +2.7V to +5.5V, VH= VDD, VL= 0, TA= -40°C to +85°C. Typical values are at VDD = +2.7V, TA= +25°C, unless
otherwise noted.)
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.
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 (100kΩ) .......................±0.6mA
MAX5463/MAX5464/MAX5465 (50kΩ) .........................±1.3mA
MAX5466/MAX5467/MAX5468 (10kΩ) .........................±1.3mA
Continuous Power Dissipation (TA= +70°C)
5-pin SC70 (derate 3.1mW/°C above TA= +70°C)..........247mW
5-pin SOT23 (derate 7.1mW/°C above TA= +70°C)........571mW
6-pin SC70 (derate 3.1mW/°C above TA= +70°C) ..........245mW
6-pin SOT23 (derate 8.7mW/°C above TA= +70°C).....695.7mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Soldering Temperature (soldering, 10s) ..........................+300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DC PERFORMANCE
Resolution 32 Taps
MAX5460/MAX5461/MAX5462 75 100 125
MAX5463/MAX5464/MAX5465 37.5 50 62.5
End-to-End Resistance
MAX5466/MAX5467/MAX5468 7.5 10 12.5
kΩ
End-to-End Resistance Tempco TCR35 ppm/°C
Ratiometric Resistance Tempco 5 ppm/°C
Integral Nonlinearity INL ±0.5 ±1 LSB
Differential Nonlinearity DNL ±1 LSB
Full-Scale Error ±0.1 LSB
Zero-Scale Error 1 LSB
MAX5460–MAX5465 600 1200
Wiper Resistance RWMAX5466/MAX5467/MAX5468 160 240 Ω
DIGITAL INPUTS
Input High Voltage VIH 0.7 x VDD V
Input Low Voltage VIL 0.3 x VDD V
TIMING CHARACTERISTICS (Figures 1, 2)
U/D Mode to CS Setup tCU 25 ns
CS to U/D Step Setup tCI 50 ns
CS to U/D Step Hold tIC 25 ns
U/D Step Low Period tIL 25 ns
U/D Step High Period tIH 25 ns
Up/Down Toggle Rate (Note 1) fTOGGLE 1 MHz
100kΩ var i ab l e r esi stor confi g ur ati on, C
L = 10p F1
Output Settling Time (Note 2) tSETTLE 100kΩ p otenti om eter confi g ur ati on, C
L = 10p F 0.25 µs
MAX5460–MAX5468
32-Tap FleaPoT™, 2-Wire Digital
Potentiometers
_______________________________________________________________________________________ 3
0
200
100
400
300
600
500
700
0 2.01.0 3.0 4.00.5 2.51.5 3.5 4.5 5.0
WIPER RESISTANCE vs. WIPER VOLTAGE
(MAX5460–MAX5465)
MAX5460 toc01
WIPER VOLTAGE (V)
WIPER RESISTANCE (Ω)
V
DD
= +2.7V
V
DD
= +5V
0
40
20
80
60
120
100
140
180
160
200
0 1.0 1.5 2.00.5 2.5 3.0 3.5 4.54.0 5.0
WIPER RESISTANCE vs. WIPER VOLTAGE
(MAX5466/MAX5467/MAX5468)
MAX5460 toc02
WIPER VOLTAGE (V)
WIPER RESISTANCE (Ω)
VDD = +2.7V
VDD = +5V
-0.25
-0.15
-0.20
-0.05
-0.10
0.05
0
0.10
-40 10-15 35 60 85
END-TO-END RESISTANCE % CHANGE
vs. TEMPERATURE
MAX5460 toc03
TEMPERATURE (°C)
END-TO-END RESISTANCE % CHNAGE
10kΩ
50kΩ, 100kΩ
0
40
20
80
60
100
120
135791113
15 17 19 21 23 25 27 29 31
W-TO-L RESISTANCE
vs. TAP POSITION
MAX5460 toc04
TAP POSITION
RESISTANCE (kΩ)
100kΩ
50kΩ
10kΩ
0.00
0.15
0.10
0.05
0.20
0.25
0.30
0.35
0.40
0.45
0.50
-40 10-15 35 60 85
SUPPLY CURRENT vs. TEMPERATURE
MAX5460 toc05
TEMPERATURE (°C)
CURRENT (µA)
VDD = +5V
VDD = +2.7V
U/D
2V/div
OUTPUT
W
100mV/div
200ns/div
TAP-TO-TAP SWITCHING TRANSIENT
(MAX5460)
MAX5460 toc06
Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
Note 1: Up/Down Toggle Rate:
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.
ft
TOGGLE SETTLE
=1
ELECTRICAL CHARACTERISTICS (continued)
(VDD = +2.7V to +5.5V, VH= VDD, VL= 0, TA= -40°C to +85°C. Typical values are at VDD = +2.7V, TA= +25°C, unless
otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
POWER SUPPLIES
Supply Voltage VDD 2.7 5.5 V
Active Supply Current (Note 3) IDD 25 µA
Standby Supply Current (Note 4) ISD VDD = +5V 0.3 1 µA
MAX5460–MAX5468
32-Tap FleaPoT™, 2-Wire Digital
Potentiometers
4 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
Pin Description
PIN
MAX5460
MAX5463
MAX5466
MAX5461
MAX5464
MAX5467
MAX5462
MAX5465
MAX5468
NAME FUNCTION
111V
DD Power Supply
2 2 2 GND Ground
333U/DUp/Down Control Input. With CS low, a low-to-high
transition increments or decrements the wiper position.
444CS
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.
5 6 6 H High Terminal of Resistor
—5—L Low Terminal of Resistor
—— 5 W Wiper Terminal of Resistor
-0.10
0
-0.05
0.10
0.05
0.15
0.20
01520510 2530
R-INL ERROR vs. INPUT CODE (50kΩ)
MAX5460 toc10
INPUT CODE (DECIMAL)
R-INL LSB
R-DNL ERROR vs. INPUT CODE (10kΩ)
MAX5460 toc11
-0.25
-0.20
-0.10
-0.15
0.05
0.10
0
-0.05
0.15
R-DNL LSB
01015520 25 30
INPUT CODE (DECIMAL)
-0.15
-0.05
-0.10
0.10
0.05
0
0.25
0.20
0.15
0.30
010155202530
R-INL ERROR vs. INPUT CODE (10kΩ)
MAX5460 toc12
INPUT CODE (DECIMAL)
R-INL (LSB)
-0.10
-0.06
-0.08
0
-0.02
-0.04
0.06
0.04
0.02
0.08
010155 202530
R-DNL ERROR vs. INPUT CODE (100kΩ)
MAX5460 toc07
INPUT CODE (DECIMAL)
R-DNL (LSB)
-0.10
-0.04
-0.06
-0.08
0
-0.02
0.08
0.06
0.04
0.02
0.10
0 5 10 15 20 25 30
R-INL ERROR vs. INPUT CODE (100kΩ)
MAX5460 toc08
INPUT CODE (DECIMAL)
R-INL (LSB)
-0.14
-0.10
-0.12
-0.04
-0.06
-0.08
0.02
0
-0.02
0.04
010155202530
R-DNL ERROR vs. INPUT CODE (50kΩ)
MAX5460 toc09
INPUT CODE (DECIMAL)
R-DNL (LSB)
MAX5460–MAX5468
32-Tap FleaPoT™, 2-Wire Digital
Potentiometers
_______________________________________________________________________________________ 5
Detailed Description
The MAX5460–MAX5468 consist of a fixed resistor and a
wiper contact with 32-tap points that are digitally con-
trolled through a 2-wire serial interface. Three resistance
values are available: 10kΩ(MAX5466/MAX5467/
MAX5468), 50kΩ(MAX5463/MAX5464/MAX5465), and
100kΩ(MAX5460/MAX5461/MAX5462).
The MAX5462/MAX5465/MAX5468 are designed to oper-
ate as potentiometers. In this configuration, the low termi-
nal 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/Dinputs 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/Dis high,
and into decrement mode if U/Dis 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/Dpin will incre-
ment 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 mini-
mum) tap position, the wiper will not wrap around to the
minimum (or maximum) position.
CS
U/D
W
NOTE: "W" IS NOT A DIGITAL SIGNAL. IT REPRESENTS WIPER TRANSITIONS.
t
CU
t
IL
t
IH
t
SETTLE
t
IC
t
CI
t
SETTLE
Figure 1. Serial Interface Timing Diagram, Increment Mode
CS
U/D
W
t
CU
t
IL
t
IH
t
IC
t
SETTLE
t
CI
t
SETTLE
NOTE: "W" IS NOT A DIGITAL SIGNAL. IT REPRESENTS WIPER TRANSITIONS.
Figure 2. Serial Interface Timing Diagram, Decrement Mode
MAX5460–MAX5468
32-Tap FleaPoT™, 2-Wire Digital
Potentiometers
6 _______________________________________________________________________________________
Power-On Reset
All parts in this family feature power-on reset (POR) cir-
cuitry that sets the wiper position to midscale at power-
up. By default, the chip is in the increment mode.
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.
Controlling a Switch-Mode
LCD Bias Generator
Figure 3 shows an application where the variable resis-
tor is used with a MAX1771 to make an adjustable posi-
tive 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 digi-
tally controlled negative LCD-bias circuit along with the
MAX774/MAX775/MAX776.
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.
Adjustable Gain
Figure 7 shows how to use the variable resistor to digi-
tally adjust the gain of a noninverting op amp configura-
tion. 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.
Figure 3. Adjustable Positive LCD Bias Figure 4. Adjustable Negative LCD Bias
MAX774
MAX775
MAX776
OUT V+
SHDN
CS
FB EXT
GND
P
7
8
C2
0.1µF
R3
0.07Ω
R1
R2
RVAR
C1
150µF
6
5
2
3
1
REF
4
Q1
Si9435
1N5822/
MBR340
L1
22µHC4*
VIN
C3
0.1µF
VOUT
* MAX774 = 330µF, 10V
MAX775/MAX776 = 120µF, 20V
VOUT(MAX) = R2 , VOUT(MIN) = R2
VREF R1 VREF R1 + RVAR
VREF - VFB ≥ 5µA (FOR 2% GAIN-SETTING ACCURACY)
R1 + RVAR
MAX5461
MAX5464
MAX5467
MAX1771
VIN = 5V
REF
SHDN
AGND
GND
N
MTD20N03HDL
7
EXT
CS
FB
L1
22µHD1
1N5817-22
C4
300µF
C5
C3
0.1µF
5
4
6
1
8
3
2
V+
C1
68µF
VOUT = 12V
AT 0.5A
R2
RSENSE
40mΩ
C2
0.1µF
VREF = 1.5V
R1
RVAR
VOUT(MAX) = R2 + 1
VREF R1
VOUT(MIN) =
(
R2
)
+ 1
VREF R1 + RVAR(MAX)
MAX5461
MAX5464
MAX5467
MAX5460–MAX5468
32-Tap FleaPoT™, 2-Wire Digital
Potentiometers
_______________________________________________________________________________________ 7
30V
W
L
H
+5V
VOUT
MAX5462
MAX5465
MAX5468
Figure 5. Positive LCD Bias Control
30V
L
H
+5V
VOUT
MAX5461
MAX5464
MAX5467
Figure 6. Positive LCD Bias Control
VCC
L
H
VIN
a) b)
VOUT
VCC
LH
W
VIN
VOUT
MAX5461
MAX5464
MAX5467
MAX5462
MAX5465
MAX5468
Figure 7. Adjustable Gain Circuit
MAX5460–MAX5468
32-Tap FleaPoT™, 2-Wire Digital
Potentiometers
8 _______________________________________________________________________________________
Chip Information
TRANSISTOR COUNT: 792
UP/DN
COUNTER
VDD
GND
CS
H
L
W
U/D
32-POSITION
DECODER
MAX5460–MAX5468
Functional Diagram
MAX5460–MAX5468
32-Tap FleaPoT™, 2-Wire Digital
Potentiometers
_______________________________________________________________________________________ 9
SC70, 5L.EPS
SOT5L.EPS
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.)
MAX5460–MAX5468
32-Tap FleaPoT™, 2-Wire Digital
Potentiometers
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
© 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
6LSOT.EPS
SC70, 6L.EPS
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.)
