19-1934; Rev 2; 11/05
Dual 256-Tap, Low-Drift,
Digital Potentiometers in 10-µMAX
General Description
The MAX5403/MAX5404/MAX5405 is a family of dual
linear taper digital potentiometers. Each device has one
3-terminal potentiometer and one 2-terminal variable
resistor (Figure 1). The MAX5403/MAX5404/MAX5405
operate from +2.7V to +5.5V single-supply voltages
and use an ultra-low supply current of 0.1µA. These
devices also provide glitchless switching between
resistors taps as well as a convenient power-on reset
(POR) that sets the wiper to the midscale position at
power-up. The potentiometer consists of a fixed resistor
with a wiper contact that is digitally controlled through a
3-wire serial interface and has 256-tap points. It per-
forms the same function as a discrete potentiometer or
variable resistor.
These parts are ideal for applications requiring digitally
controlled resistors. Three resistance values are avail-
able: 10kΩ (MAX5403), 50kΩ (MAX5404), and 100kΩ
(MAX5405). A nominal resistor-temperature coefficient
of 35ppm/°C end-to-end and 5ppm/°C ratiometric make
the MAX5403/MAX5404/MAX5405 ideal for applications
requiring low temperature-coefficient variable resistors,
such as adjustable-gain circuit configurations.
The MAX5403/MAX5404/MAX5405 are available in a 10-
pin µMAX
®
package. Each device is guaranteed over the
extended industrial temperature range (-40°C to +85°C).
♦
256-Tap Positions
♦
Ultra Low 0.1µA Supply Current
♦
+2.7V to +5.5V Single-Supply Operation
♦
Low End-To-End Temperature Coefficient:
35ppm/°C
♦
Low Ratiometric Temperature Coefficient:
5ppm/°C
♦
Power-On Reset: Wiper Goes to Midscale
(Position 128)
♦
Glitchless Switching Between Resistor Taps
♦
3-Wire SPI™ -Interface Compatible
♦
10kΩ/50kΩ/100kΩ Resistor Values
Features
♦
10-Pin µMAX Small Footprint Package
MAX5403/MAX5404/MAX5405
Ordering Information
PART
MAX5403EUB
MAX5404EUB
MAX5405EUB
PIN-PACKAGE
10 µMAX
10 µMAX
10 µMAX
R
(kΩ)
10
50
100
PKG
CODE
U10C-4
U10C-4
U10C-4
Applications
Mechanical Potentiometer Replacement
Low-Drift Programmable Gain Amplifier (PGA)
Volume Control
LCD Screen Adjustment
Adjustable Voltage Reference
Programmable Filters, Delays, Time Constant
Impedance Matching
Note:
All devices operate over the -40°C to +85°C temperature
range.
Pin Configuration
TOP VIEW
GND
1
L
B
H
B
W
B
CS
2
3
4
5
10
L
A
9
W
A
V
DD
SCLK
DIN
MAX5403
MAX5404
MAX5405
8
7
6
µMAX
SPI is a registered trademark of Motorola, Inc.
µMAX is a registered trademark of Maxim Integrated
Products, Inc.
________________________________________________________________
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.
Dual 256-Tap, Low-Drift,
Digital Potentiometers in 10-µMAX
MAX5403/MAX5404/MAX5405
ABSOLUTE MAXIMUM RATINGS
V
DD
to GND ..............................................................-0.3V to +6V
DIN, SCLK,
CS
.........................................................-0.3V to +6V
H
X
, L
X
, W
X
to GND .......................................-0.3V to (V
DD
+ 0.3)
Maximum Continuous Current Into H
X
, L
X
, and W
X
...........±1mA
Continuous Power Dissipation (T
A
= +70°C)
10-Pin µMAX (derate 5.6mW/°C above +70°C) ...........444mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
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
= +5V, unless otherwise noted. V
H
= V
DD
, V
L
= 0, T
A
= T
MIN
to T
MAX
. Typical values are at V
DD
= +5V, T
A
= +25°C,
unless otherwise noted.)
PARAMETER
Resolution
Integral Nonlinearity (Notes 1, 2)
Differential Nonlinearity (Notes 1, 2)
End-to-End Resistor Tempco
Ratiometric Resistor Tempco
Full-Scale Error
Zero-Scale Error
Full-Scale Error
Zero-Scale Error
Full-Scale Error
Zero-Scale Error
DC PERFORMANCE
(Variable Resistor Mode)
Resolution
N
MAX5403 (Pot A)
V
DD
= +5V
Integral Nonlinearity (Notes 1, 3)
INL
MAX5403 (Pot B)
MAX5404
MAX5405
MAX5403 (Pot A)
V
DD
= +3V
MAX5403 (Pot B)
MAX5404
MAX5405
Differential Nonlinearity
(Notes 1, 3)
DNL
V
DD
= +5V
V
DD
= +3V
V
DD
= +5V
V
DD
= +3V
MAX5403
MAX5404/MAX5405
50
30
275
550
8
±2.5
±1
±1
±1
±4.5
±3
±1.5
±1.5
±1/2
LSB
LSB
Bits
MAX5403
MAX5403
MAX5404
MAX5404
MAX5405
MAX5405
SYMBOL
N
INL
DNL
TC
R
35
5
-8
+8
-1.6
+1.6
-0.8
+0.8
CONDITIONS
MIN
8
±1/2
±1/2
TYP
MAX
UNITS
Bits
LSB
LSB
ppm/°C
ppm/°C
LSB
LSB
LSB
LSB
LSB
LSB
DC PERFORMANCE
(Voltage Divider Mode)
DC PERFORMANCE
(Resistor Characteristics)
Wiper Resistance (Note 4)
Wiper Capacitance
R
W
C
W
Ω
pF
2
_______________________________________________________________________________________
Dual 256-Tap, Low-Drift,
Digital Potentiometers in 10-µMAX
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +5V, unless otherwise noted. V
H
= V
DD
, V
L
= 0, T
A
= T
MIN
to T
MAX
. Typical values are at V
DD
= +5V, T
A
= +25°C,
unless otherwise noted.)
PARAMETER
End-to-End Resistance
DIGITAL INPUTS
Input High Voltage
Input Low Voltage
Input Leakage Current
Input Capacitance
TIMING CHARACTERISTICS (ANALOG)
MAX5403
Wiper-Settling Time
t
S
MAX5404
MAX5405
TIMING CHARACTERISTICS (DIGITAL)
(Note 5)
Maximum SCLK Frequency
SCLK Clock Period
SCLK Pulse Width High
SCLK Pulse Width Low
CS
Fall to SCLK Rise Setup Time
SCLK Rise to
CS
Rise Hold Time
DIN Setup Time
DIN Hold Time
SCLK Rise to
CS
Fall Delay
CS
Rise to SCLK Rise Hold
CS
Pulse Width High
POWER SUPPLIES
Supply Voltage
Supply Current
V
DD
I
DD
CS
= SCLK = DIN = V
DD
V
DD
= +5V
V
DD
= +2.7V
2.7
0.8
0.1
5.5
5
V
µA
µA
t
CP
t
CH
t
CL
t
CSS
t
CSH
t
DS
t
DH
t
CS0
t
CS1
t
CSW
10
100
40
40
40
0
40
0
10
40
100
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
100
325
650
ns
5
V
IH
V
IL
0.7
✕
V
DD
0.3
✕
V
DD
±1.0
V
V
µA
pF
SYMBOL
MAX5403
R
HL
MAX5404
MAX5405
CONDITIONS
MIN
7.5
37.5
75
TYP
10
50
100
MAX
12.5
62.5
125
kΩ
UNITS
MAX5403/MAX5404/MAX5405
Note 1:
Linearity is defined in terms of the H
X
to L
X
code-dependent resistance.
Note 2:
The DNL and INL are measured with the potentiometer configured as a voltage divider with H
X
= V
DD
and L
X
= 0. The wiper
terminal is unloaded and measured with an ideal voltmeter.
Note 3:
The DNL and INL are measured with the potentiometer configured as a variable resistor. For the 3-terminal potentiometer
(Pot A), H
A
is unconnected and L
A
= 0. For the 2-terminal potentiometer (Pot B), only L
B
= 0. At V
DD
= +5V, the wiper termi-
nal is driven with a source current of 400µA for the 10kΩ configuration, 80µA for the 50kΩ configuration, and 40µA for the
100kΩ configuration. At V
DD
= +3V, 200µA/40µA/20µA for 10kΩ/50kΩ/100kΩ configuration respectively.
Note 4:
The wiper resistance is the worst value measured by injecting into W
X
, a current I
W
= V
DD
/ R
HL
.
Note 5:
Digital timing is guaranteed by design.
_______________________________________________________________________________________
3
Dual 256-Tap, Low-Drift,
Digital Potentiometers in 10-µMAX
MAX5403/MAX5404/MAX5405
Typical Operating Characteristics
(V
DD
= +5.0V, T
A
= +25°C, unless otherwise noted.)
WIPER RESISTANCE vs.
WIPER VOLTAGE (50kΩ)
360
340
WIPER RESISTANCE (Ω)
320
300
280
260
240
220
200
180
160
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
WIPER VOLTAGE (V)
V
DD
= +5V
V
DD
= +3V
MAX5403 toc01
WIPER RESISTANCE vs.
WIPER VOLTAGE (100kΩ)
MAX5403 toc02
WIPER RESISTANCE
vs. WIPER VOLTAGE (10kΩ)
MAX5403 toc03
380
400
380
WIPER RESISTANCE (Ω)
360
340
320
300
280
260
240
220
200
180
160
0
V
DD
= +5V
V
DD
= +3V
300
280
WIPER RESISTANCE (Ω)
260
240
220
200
180
160
V
DD
= +5V
V
DD
= +3V
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)
WIPER-TO-END RESISTANCE
vs. INPUT CODE (50kΩ)
MAX5403 toc04
WIPER-TO-END RESISTANCE
vs. INPUT CODE (100kΩ)
MAX5403 toc05
WIPER-TO-END RESISTANCE
vs. INPUT CODE (10kΩ)
9
W-TO-L RESISTANCE (kΩ)
8
7
6
5
4
3
2
1
0
MAX5403 toc06
50
45
W-TO-L RESISTANCE (kΩ)
40
35
30
25
20
15
10
5
0
0
32
64
96
100
90
W-TO-L RESISTANCE (kΩ)
80
70
60
50
40
30
20
10
0
10
128 160 192 224 256
0
32
64
96
128 160 192 224 256
0
32
64
96
128 160 192 224 256
INPUT CODE (DECIMAL)
INPUT CODE (DECIMAL)
INPUT CODE (DECIMAL)
VARIABLE RESISTOR DNL
vs. INPUT CODE (10kΩ)
MAX5403 toc07
VARIABLE RESISTOR INL
vs. INPUT CODE (10kΩ)
MAX5403 toc08
VARIABLE RESISTOR DNL
vs. INPUT CODE (50kΩ)
0.05
0.04
DNL (LSB)
0.03
0.02
0.01
0.00
-0.01
-0.02
-0.03
V
DD
= +5V
MAX5403 toc09
0.20
0.50
0.40
0.30
INL (LSB)
0.20
0.10
0.00
-0.10
0.06
0.15
DNL (LSB)
0.10
0.05
0.00
-0.20
-0.05
0
32
64
96
128 160 192 224 256
INPUT CODE (DECIMAL)
-0.30
0
32
64
96
128 160 192 224 256
INPUT CODE (DECIMAL)
0
32
64
96
128 160 192 224 256
INPUT CODE (DECIMAL)
4
_______________________________________________________________________________________
Dual 256-Tap, Low-Drift,
Digital Potentiometers in 10-µMAX
Typical Operating Characteristics (continued)
(V
DD
= +5.0V, T
A
= +25°C, unless otherwise noted.)
VARIABLE RESISTOR INL
vs. INPUT CODE (50kΩ)
MAX5403 toc10
MAX5403/MAX5404/MAX5405
VARIABLE RESISTOR DNL
vs. INPUT CODE (100kΩ)
MAX5403 toc11
VARIABLE RESISTOR INL
vs. INPUT CODE (100kΩ)
0.10
0.05
INL (LSB)
0.00
-0.05
-0.10
-0.15
-0.20
MAX5403 toc12
0.04
0.02
0.00
-0.02
INL (LSB)
-0.04
-0.06
-0.08
-0.10
-0.12
-0.14
-0.16
0
32
64
96
0.12
0.11
0.10
0.09
0.08
0.07
0.06
0.05
0.04
0.03
0.02
0.01
0.00
-0.01
-0.02
0
32
64
96
128
160 192 224
0.15
128 160 192 224 256
DNL (LSB)
256
0
32
64
96
128
160 192 224
256
INPUT CODE (DECIMAL)
INPUT CODE (DECIMAL)
INPUT CODE (DECIMAL)
VOLTAGE-DIVIDER DNL
vs. INPUT CODE (10kΩ)
MAX5403 toc13
VOLTAGE-DIVIDER INL
vs. INPUT CODE (10kΩ)
MAX5403 toc14
VOLTAGE-DIVIDER DNL
vs. INPUT CODE (50kΩ)
0.07
0.06
0.05
DNL (LSB)
0.04
0.03
0.02
0.01
0.00
-0.01
-0.02
MAX5403 toc15
0.08
0.07
0.06
0.05
DNL (LSB)
0.15
0.10
0.05
INL (LSB)
0.00
-0.05
-0.10
-0.15
-0.20
0.08
0.04
0.03
0.02
0.01
0.00
-0.01
-0.02
0
32
64
96
128
160 192 224
256
INPUT CODE (DECIMAL)
0
32
64
96
128
160 192 224
256
0
32
64
96
128
160 192 224
256
INPUT CODE (DECIMAL)
INPUT CODE (DECIMAL)
VOLTAGE-DIVIDER INL
vs. INPUT CODE (50kΩ)
MAX5403 toc16
VOLTAGE-DIVIDER DNL
vs. INPUT CODE (100kΩ)
MAX5403 toc17
VOLTAGE-DIVIDER INL
vs. INPUT CODE (100kΩ)
0.10
0.05
INL (LSB)
0.00
-0.05
-0.10
-0.15
-0.20
MAX5403 toc18
0.15
0.10
0.05
0.08
0.07
0.06
0.05
DNL (LSB)
0.04
0.03
0.02
0.01
0.00
-0.01
0.15
INL (LSB)
0.00
-0.05
-0.10
-0.15
-0.20
0
32
64
96
128
160 192 224
256
INPUT CODE (DECIMAL)
-0.02
0
32
64
96
128
160 192 224
256
INPUT CODE (DECIMAL)
0
32
64
96
128
160 192 224
256
INPUT CODE (DECIMAL)
_______________________________________________________________________________________
5
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