General Description
The MAX5460MAX5468 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: 10k
(MAX5466/
MAX5467/MAX5468), 50k
(MAX5463/MAX5464/
MAX5465), and 100k
(MAX5460/MAX5461/MAX5462).
The MAX5460MAX5465 (100k
and 50k) are avail-
able 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.
Applications
LCD Screen Adjustment
Volume Control
Mechanical Potentiometer Replacement
Gain Adjustment
Line Impedance Matching
Features
o Miniature SC70 and SOT23 Packages
o 0.3A Ultra-Low Supply Current
o +2.7V to +5.5V Single-Supply Operation
o Glitchless Switching Between Resistor Taps
o Power-On Reset to Midscale
o 2-Wire Up/Down Serial Interface
o 10k, 50k, and 100k Resistance Values
MAX5460MAX5468
32-Tap FleaPoT
TM
, 2-Wire Digital
Potentiometers
________________________________________________________________ Maxim Integrated Products
1
TOP VIEW
GND
CS
U/D
1
5
H
V
DD
MAX5460
MAX5463
MAX5466
SOT23, SC70
2
3
4
GND
CS
U/D
1
6
H
V
DD
MAX5461
MAX5464
MAX5467
SOT23, SC70
2
3
4
L
5
GND
CS
U/D
1
6
H
V
DD
MAX5462
MAX5465
MAX5468
SOT23, SC70
2
3
4
W
5
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 (k)
MAX5460EXK
-40
C to +85C 5 SC70
ACA
100
MAX5461EXT
-40
C to +85C 6 SC70
AAP
100
MAX5462EXT
-40
C to +85C 6 SC70
AAQ
100
MAX5463EXK
-40
C to +85C 5 SC70
ACB
50
MAX5464EXT
-40
C to +85C 6 SC70
AAR
50
MAX5465EXT
-40
C to +85C 6 SC70
AAS
50
MAX5466EUK
-40
C to +85C 5 SOT23
ADQQ
10
MAX5467EUT
-40
C to +85C 6 SOT23
AARH
10
MAX5468EUT
-40
C to +85C 6 SOT23
AARI
10
FleaPoT is a trademark of Maxim Integrated Products Inc.
MAX5460MAX5468
32-Tap FleaPoT
TM
, 2-Wire Digital
Potentiometers
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.)
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.
V
DD
to GND ..............................................................-0.3V to +6V
All Other Pins to GND.................................-0.3V to (V
DD
+ 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 (T
A
= +70C)
5-pin SC70 (derate 3.1mW/C above T
A
= +70C)..........247mW
5-pin SOT23 (derate 7.1mW/C above T
A
= +70C)........571mW
6-pin SC70 (derate 3.1mW/C above T
A
= +70C) ..........245mW
6-pin SOT23 (derate 8.7mW/C above T
A
= +70C).....695.7mW
Operating Temperature Range ...........................-40C to +85C
Junction Temperature ......................................................+150C
Storage Temperature Range .............................-65C to +150C
Soldering Temperature (soldering, 10s) ..........................+300C
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
k
End-to-End Resistance Tempco
TC
R
35
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
MAX5460MAX5465
600
1200
Wiper Resistance
R
W
MAX5466/MAX5467/MAX5468
160
240
DIGITAL INPUTS
Input High Voltage
V
IH
0.7
x
V
DD
V
Input Low Voltage
V
IL
0.3
x
V
DD
V
TIMING CHARACTERISTICS (Figures 1, 2)
U/D Mode to CS Setup
t
CU
25
ns
CS to U/D Step Setup
t
CI
50
ns
CS to U/D Step Hold
t
IC
25
ns
U/D Step Low Period
t
IL
25
ns
U/D Step High Period
t
IH
25
ns
Up/Down Toggle Rate (Note 1)
f
TOGGLE
1
MHz
100k
var i ab l e r esi stor confi g ur ati on, C
L
= 10p F
1
Output Settling Time (Note 2)
t
SETTLE
100k
p otenti om eter confi g ur ati on, C
L
= 10p F
0.25
s
MAX5460MAX5468
32-Tap FleaPoT
TM
, 2-Wire Digital
Potentiometers
_______________________________________________________________________________________
3
0
200
100
400
300
600
500
700
0
2.0
1.0
3.0
4.0
0.5
2.5
1.5
3.5
4.5 5.0
WIPER RESISTANCE vs. WIPER VOLTAGE
(MAX5460MAX5465)
MAX5460 toc01
WIPER VOLTAGE (V)
WIPER RESISTANCE (
)
V
DD
= +2.7V
V
DD
= +5V
0
40
20
80
60
120
100
140
180
160
200
0
1.0 1.5 2.0
0.5
2.5 3.0 3.5
4.5
4.0
5.0
WIPER RESISTANCE vs. WIPER VOLTAGE
(MAX5466/MAX5467/MAX5468)
MAX5460 toc02
WIPER VOLTAGE (V)
WIPER RESISTANCE (
)
V
DD
= +2.7V
V
DD
= +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
10k
50k
, 100k
0
40
20
80
60
100
120
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31
W-TO-L RESISTANCE
vs. TAP POSITION
MAX5460 toc04
TAP POSITION
RESISTANCE (k
)
100k
50k
10k
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 (
A)
V
DD
= +5V
V
DD
= +2.7V
U/D
2V/div
OUTPUT
W
100mV/div
200ns/div
TAP-TO-TAP SWITCHING TRANSIENT
(MAX5460)
MAX5460 toc06
Typical Operating Characteristics
(T
A
= +25C, 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, f
TOGGLE
= 1MHz.
Note 4: Supply current taken while wiper position is fixed.
f
t
TOGGLE
SETTLE
=
1
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
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
POWER SUPPLIES
Supply Voltage
V
DD
2.7
5.5
V
Active Supply Current (Note 3)
I
DD
25
A
Standby Supply Current (Note 4)
I
SD
V
DD
= +5V
0.3
1
A
MAX5460MAX5468
32-Tap FleaPoT
TM
, 2-Wire Digital
Potentiometers
4
_______________________________________________________________________________________
Typical Operating Characteristics (continued)
(T
A
= +25C, unless otherwise noted.)
Pin Description
PIN
MAX5460
MAX5463
MAX5466
MAX5461
MAX5464
MAX5467
MAX5462
MAX5465
MAX5468
NAME
FUNCTION
1
1
1
V
DD
Power Supply
2
2
2
GND
Ground
3
3
3
U/D
Up/Down Control Input. With CS low, a low-to-high
transition increments or decrements the wiper position.
4
4
4
CS
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
0
15
20
5
10
25
30
R-INL ERROR vs. INPUT CODE (50k
)
MAX5460 toc10
INPUT CODE (DECIMAL)
R-INL LSB
R-DNL ERROR vs. INPUT CODE (10k
)
MAX5460 toc11
-0.25
-0.20
-0.10
-0.15
0.05
0.10
0
-0.05
0.15
R-DNL LSB
0
10
15
5
20
25
30
INPUT CODE (DECIMAL)
-0.15
-0.05
-0.10
0.10
0.05
0
0.25
0.20
0.15
0.30
0
10
15
5
20
25
30
R-INL ERROR vs. INPUT CODE (10k
)
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
0
10
15
5
20
25
30
R-DNL ERROR vs. INPUT CODE (100k
)
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 (100k
)
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
0
10
15
5
20
25
30
R-DNL ERROR vs. INPUT CODE (50k
)
MAX5460 toc09
INPUT CODE (DECIMAL)
R-DNL (LSB)
MAX5460MAX5468
32-Tap FleaPoT
TM
, 2-Wire Digital
Potentiometers
_______________________________________________________________________________________
5
Detailed Description
The MAX5460MAX5468 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: 10k
(MAX5466/MAX5467/
MAX5468), 50k
(MAX5463/MAX5464/MAX5465), and
100k
(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 MAX5460MAX5468 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 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
PDF 
ZIP