19-1997; Rev 2; 2/06
Dual, 256-Tap, Up/Down Interface,
Digital Potentiometers
General Description
The MAX5450–MAX5455 are a family of dual digital
potentiometers that perform the same function as a
mechanical potentiometer or variable resistor. The
MAX5451/MAX5453/MAX5455 have two 3-terminal
potentiometers and the MAX5450/MAX5452/MAX5454
have two 2-terminal variable resistors. The MAX5450–
MAX5455 operate from a +2.7V to +5.5V single-supply
voltage and use an ultra-low supply current of 0.1µA.
These devices consist of two fixed resistors each
with 256 digitally-controlled wiper contacts. The conve-
nient power-on reset (POR) sets the wiper to midscale
position at power-up and the easy-to-use up/down
interface allows glitchless switching between
resistor taps. Six inputs control the 14-pin MAX5451/
MAX5453/MAX5455 potentiometers. Four inputs control
the 10-pin MAX5450/MAX5452/MAX5454 variable resis-
tors.
The MAX5450–MAX5455 are ideal for applications
requiring digitally-controlled resistors. Three resistance
values are available: 10kΩ, 50kΩ, and 100kΩ. An end-
to-end resistor temperature coefficient of 35ppm/°C
and a ratiometric temperature coefficient of 5ppm/°C
make the MAX5450–MAX5455 excellent choices for
adjustable gain circuit requiring low-temperature drift
The MAX5450–MAX5455 are available in 10-pin µMAX
®
and 14-pin TSSOP packages. Each device is guaran-
teed over the extended–industrial temperature range
(-40°C to +85°C).
Features
♦
Small-Footprint Packages
10-Pin µMAX (MAX5450/MAX5452/MAX5454)
14-Pin TSSOP (MAX5451/MAX5453/MAX5455)
♦
256-Tap Positions
♦
Independent Up/Down Potentiometer Controls
(MAX5451/MAX5453/MAX5455)
♦
Ultra-Low 0.1µA Supply Current
♦
+2.7V to +5.5V Single-Supply Operation
♦
Low 35ppm/°C End-to-End Temperature
Coefficient
♦
Power-On Reset Sets Wiper to Midscale
(Position 127)
♦
Glitchless Switching Between the Resistor Taps
♦
10kΩ, 50kΩ, 100kΩ Resistance Values
MAX5450–MAX5455
Ordering Information
PART
MAX5450EUB
MAX5451EUD
MAX5452EUB
MAX5453EUD
MAX5454EUB
MAX5455EUD
PIN-PACKAGE
10 µMAX
14 TSSOP
10 µMAX
14 TSSOP
10 µMAX
14 TSSOP
R (kΩ)
10
10
50
50
100
100
PKG
CODE
U10C-4
U14-1
U10C-4
U14-1
U10C-4
U14-1
Applications
Mechanical Potentiometer Replacement
Low-Drift Programmable-Gain Amplifier (PGA)
Volume Control
LCD Screen Adjustment
Adjustable Voltage References
Adjustable Linear Regulators
Programmable Filters, Delays, Time Constants
Impedance Matching
Note:
All devices specified over the -40°C to +85°C operating
range.
Pin Configurations
TOP VIEW
CS1
1
U/D
V
DD
W1
2
3
4
5
10
CS2
9
INC
GND
W2
L2
CS1 1
U/D1
U/D2
2
3
14 CS2
13 INC1
12 INC2
MAX5450
MAX5452
MAX5454
8
7
6
V
DD
4
W1 5
H1 6
L1 7
µMAX is a registered trademark of Maxim Integrated Products, Inc.
L1
MAX5451
MAX5453
MAX5455
11 GND
10 W2
9
8
H2
L2
µMAX
TSSOP
________________________________________________________________
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, Up/Down Interface,
Digital Potentiometers
MAX5450–MAX5455
ABSOLUTE MAXIMUM RATINGS
V
DD
to GND ..............................................................-0.3V to +6V
CS_, INC_,
and U/D_ to GND...................................-0.3V to +6V
H_, L_, W_ to GND ......................................-0.3V to (V
DD
+0.3V)
Maximum Continuous Current into H_, L_, and W_............±1mA
Continuous Power Dissipation (T
A
= +70°C)
10-Pin µMAX (derate 6.94mW/°C above +70°C) ..........555mW
14-Pin TSSOP (derate 9.1mW/°C above +70°C) ..........727mW
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
= +2.7V to +5.5V, V
H
= V
DD
, V
L
= 0; T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
DD
= +5V, T
A
= +25°C,
unless otherwise noted.)
PARAMETER
Resolution
Integral Nonlinearity
(Notes 1 and 2)
Differential Nonlinearity
(Notes 1 and 2)
End-to-End Resistor Tempco
Ratiometric Resistor Tempco
MAX5451
Full-Scale Error
MAX5453
MAX5455
MAX5451
Zero-Scale Error
DC PERFORMANCE (Variable Resistor Mode)
Resolution
Integral Nonlinearity
(Notes 1 and 3)
N
V
DD
= +5V
INL
V
DD
= +3V
Differential Nonlinearity
(Notes 1 and 3)
DNL
V
DD
= +5V
V
DD
= +3V
V
DD
= +5V, MAX5451/MAX5453/MAX5455
V
DD
= +3V, MAX5451/MAX5453/MAX5455
10
MAX5450, MAX5451
End-To-End Resistance
R
HL
MAX5452, MAX5453
MAX5454, MAX5455
6.5
32
60
10
50
100
12.5
62.5
125
kΩ
225
550
MAX5450, MAX5451
MAX5452–MAX5455
MAX5450, MAX5451
MAX5452–MAX5455
8
±3
±1
±4.5
±2
±1
±1
LSB
LSB
Bits
MAX5453
MAX5455
SYMBOL
N
INL
DNL
TC
R
V
DD
= +5V
V
DD
= +3V
V
DD
= +5V
V
DD
= +3V
35
5
-8
-1.6
-0.8
+8
+1.6
+0.8
LSB
LSB
CONDITIONS
MIN
8
±1
±1
±1
±1
TYP
MAX
UNITS
Bits
LSB
LSB
ppm/°C
ppm/°C
DC PERFORMANCE (Voltage-Divider Mode, MAX5451/MAX5453/MAX5455 Only)
DC PERFORMANCE (Resistor Characteristics)
Wiper Resistance (Note 4)
Wiper Capacitance
R
W
C
W
Ω
pF
2
_______________________________________________________________________________________
Dual, 256-Tap, Up/Down Interface,
Digital Potentiometers
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +2.7V to +5.5V, V
H
= V
DD
, V
L
= 0; T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
DD
= +5V, T
A
= +25°C,
unless otherwise noted.)
PARAMETER
DIGITAL INPUTS (Note 5)
Input High Voltage
Input Low Voltage
Input Leakage Current
Input Capacitance
TIMING CHARACTERISTICS (Analog)
MAX5451
Wiper-Settling Time
(Note 6)
t
IW
MAX5453
MAX5455
TIMING CHARACTERISTICS (Digital, Note 7, Figure 1)
Maximum
INC
Frequency
CS
to
INC
Setup Time
CS
to
INC
Hold Time
INC
Low Period
INC
High Period
U/D to
INC
Setup
U/D to
INC
Hold
POWER SUPPLIES
Supply Voltage
Supply Current
V
DD
I
DD
CS
=
INC
= U/D = V
DD
or GND
V
DD
= +5V
V
DD
= +2.7V
2.7
0.7
0.1
5.5
2
V
µA
f
MAX
t
CI
t
IC
t
IL
t
IH
t
DI
t
ID
7
25
0
25
25
50
0
MHz
ns
ns
ns
ns
ns
ns
0.5
1.2
1.8
µs
5
V
IH
V
IL
0.7 x V
DD
0.3 x V
DD
±1.0
V
V
µA
pF
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX5450–MAX5455
Note 1:
Linearity is defined in terms of the H_ to L_ code-dependent resistance.
Note 2:
The DNL and INL are measured with the potentiometer configured as a voltage divider with H_ = V
DD
and L_ = GND. 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 potentiometers
(MAX5451/MAX5453/MAX5455), H_ is unconnected and L_ = GND. For the 2-terminal potentiometers
(MAX5450/MAX5452/MAX5454), L_ = GND. At V
DD
= +5V, the wiper terminal 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 the currents given in Note 3 into W_ with L_ = GND. R
W
_ =
(V
W
_ - V
H
_) / I
W
_.
Note 5:
Device draws higher supply current when digital inputs are driven with voltages between (V
DD
- 0.5V) and (GND + 0.5V).
(See Supply Current vs. Digital Input Voltage in the
Typical Operating Characteristics.)
Note 6:
Wiper-Settling Time is the worst case 0% to 50% rise-time measured between consecutive wiper positions. H_ = V
DD
, L_ =
GND, and the wiper terminal is unloaded and measured with a 10pF oscilloscope probe (see Tap-To-Tap Switching
Transient in the
Typical Operating Characteristics).
Note 7:
Digital timing is guaranteed by design.
_______________________________________________________________________________________
3
Dual, 256-Tap, Up/Down Interface,
Digital Potentiometers
MAX5450–MAX5455
Typical Operating Characteristics
(V
DD
= +5V, T
A
= +25°C, unless otherwise noted.)
WIPER RESISTANCE
vs. WIPER VOLTAGE (10kΩ)
MAX5450/5 toc01
WIPER RESISTANCE
vs. WIPER VOLTAGE (50kΩ)
MAX5450/5 toc02
WIPER RESISTANCE
vs. WIPER VOLTAGE (100kΩ)
MAX5450/5 toc03
MAX5450/5 toc09
MAX5450/5 toc06
300
280
WIPER RESISTANCE (Ω)
260
240
220
200
180
160
0
V
DD
= +5V
V
DD
= +3V
380
360
340
WIPER RESISTANCE (Ω)
320
300
280
260
240
220
200
180
160
V
DD
= +5V
V
DD
= +3V
400
380
WIPER RESISTANCE (Ω)
360
340
320
300
280
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)
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 RESISTANCE
vs. WIPER POSITION (10kΩ)
MAX5450/5 toc04
WIPER RESISTANCE
vs. WIPER POSITION (50kΩ)
45
W-TO-L RESISTANCE (kΩ)
40
35
30
25
20
15
10
5
0
MAX5450/5 toc05
WIPER RESISTANCE
vs. WIPER POSITION (100kΩ)
100
90
W-TO-L RESISTANCE (kΩ)
80
70
60
50
40
30
20
10
0
10
9
W-TO-L RESISTANCE (kΩ)
8
7
6
5
4
3
2
1
0
0
32
64
96
50
128 160 192 224 256
0
32
64
96
128 160 192 224 256
0
32
64
96
128 160 192 224 256
WIPER POSITION
WIPER POSITION
WIPER POSITION
VARIABLE RESISTOR DNL
vs. WIPER POSITION (10kΩ)
MAX5450/5 toc07
VARIABLE RESISTOR INL
vs. WIPER POSITION (MAX5451)
0.40
0.30
INL (LSB)
0.20
0.10
0.00
-0.10
MAX5450/5 toc08
VARIABLE RESISTOR DNL
vs. WIPER POSITION (50kΩ)
0.06
0.05
0.04
DNL (LSB)
0.03
0.02
0.01
0.00
-0.01
-0.02
-0.03
0.20
0.50
0.15
DNL (LSB)
0.10
0.05
0.00
-0.20
-0.05
0
32
64
96
128 160 192 224 256
WIPER POSITION
-0.30
0
32
64
96
128 160 192 224 256
WIPER POSITION
0
32
64
96
128 160 192 224 256
WIPER POSITION
4
_______________________________________________________________________________________
Dual, 256-Tap, Up/Down Interface,
Digital Potentiometers
Typical Operating Characteristics (continued)
(
V
DD
= +5V, T
A
= +25°C, unless otherwise noted.)
VARIABLE RESISTOR INL
vs. WIPER POSITION (MAX5453)
MAX5450/5 toc10
MAX5450–MAX5455
VARIABLE RESISTOR DNL
vs. WIPER POSITION (100kΩ)
MAX5450/5 toc11
VARIABLE RESISTOR INL
vs. WIPER POSITION (MAX5455)
0.10
0.05
INL (LSB)
0.00
-0.05
-0.10
-0.15
-0.20
MAX5450/5 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
WIPER POSITION
WIPER POSITION
WIPER POSITION
VOLTAGE-DIVIDER DNL
vs. WIPER POSITION (10kΩ)
MAX5450/5 toc13
VOLTAGE-DIVIDER INL
vs. WIPER POSITION (10kΩ)
MAX5450/5 toc14
VOLTAGE-DIVIDER DNL
vs. WIPER POSITION (50kΩ)
0.07
0.06
0.05
DNL (LSB)
0.04
0.03
0.02
0.01
0.00
-0.01
MAX5450/5 toc15
0.08
0.07
0.06
0.05
DNL (LSB)
0.04
0.03
0.02
0.01
0.00
-0.01
-0.02
0
32
64
96
128
160 192 224
0.15
0.10
0.05
INL (LSB)
0.00
-0.05
-0.10
-0.15
-0.20
0.08
256
0
32
64
96
128
160 192 224
256
-0.02
0
32
64
96
128
160 192 224
256
WIPER POSITION
WIPER POSITION
WIPER POSITION
VOLTAGE-DIVIDER INL
vs. WIPER POSITION (50kΩ)
MAX5450/5 toc16
VOLTAGE-DIVIDER DNL
vs. WIPER POSITION (100kΩ)
MAX5450/5 toc17
VOLTAGE-DIVIDER INL
vs. WIPER POSITION (100kΩ)
0.10
0.05
INL (LSB)
0.00
-0.05
-0.10
-0.15
-0.20
MAX5450/5 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
0.15
INL (LSB)
0.00
-0.05
-0.10
-0.15
-0.20
0
32
64
96
128
160 192 224
256
WIPER POSITION
-0.01
-0.02
0
32
64
96
128
160 192 224
256
WIPER POSITION
0
32
64
96
128
160 192 224
256
WIPER POSITION
_______________________________________________________________________________________
5
测试/测量
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