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MAX5467EUT+T

P1-P3P4-P6P7-P9P10-P10
MAX5460–MAX5468
32-Tap FleaPoT
™
, 2-Wire Digital
Potentiometers
4 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(T
A
= +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/D
Up/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
010155
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
010155 202530
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/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
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
0.1
µ
F
R3
0.07
Ω
R1
R2
R
VAR
C1
150
µ
F
6
5
2
3
1
REF
4
Q1
Si9435
1N5822/
MBR340
L1
22
µ
H
C4*
V
IN
C3
0.1
µ
F
V
OUT
* MAX774 = 330
µ
F, 10V
MAX775/MAX776 = 120
µ
F, 20V
V
OUT(MAX)
=
R2
,
V
OUT(MIN)
=
R2
V
REF
R1 V
REF
R1 + R
VAR
V
REF
- V
FB
≥
5
µ
A (FOR 2% GAIN-SETTING ACCURACY)
R1 + R
VAR
MAX5461
MAX5464
MAX5467
MAX1771
V
IN
= 5V
REF
SHDN
AGND
GND
N
MTD20N03HDL
7
EXT
CS
FB
L1
22
µ
H
D1
1N5817-22
C4
300
µ
F
C5
C3
0.1
µ
F
5
4
6
1
8
3
2
V+
C1
68
µ
F
V
OUT
= 12V
AT 0.5A
R2
R
SENSE
40m
Ω
C2
0.1
µ
F
V
REF
= 1.5V
R1
R
VAR
V
OUT(MAX)
=
R2
+ 1
V
REF
R1
V
OUT(MIN)
=
(
R2
)
+ 1
V
REF
R1 + R
VAR(MAX)
MAX5461
MAX5464
MAX5467
P1-P3P4-P6P7-P9P10-P10

MAX5467EUT+T

Mfr. #:
Buy MAX5467EUT+T
Manufacturer:
Maxim Integrated
Description:
Digital Potentiometer ICs 32-Tap FleaPoT 2Wire
Lifecycle:
New from this manufacturer.
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