MAX5475 Datasheet PDF - Maxim

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MAX5475
Maxim

Part Number MAX5475
Description 32-Tap/ Nonvolatile/ Linear-Taper Digital Potentiometers
Page 12 Pages


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19-3067; Rev 0; 10/03
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32-Tap, Nonvolatile, Linear-Taper Digital
Potentiometers in SOT23
General Description
The MAX5471/MAX5472/MAX5474/MAX5475 linear-
taper digital potentiometers function as mechanical
potentiometers, but replace the mechanics with a sim-
ple 3-wire up/down digital interface. These digital
potentiometers feature nonvolatile memory (EEPROM)
to return the wiper to its previously stored position upon
power-up.
The MAX5471/MAX5472 are 2-terminal, variable resistors
in 6-pin SOT23 packages. The MAX5474/MAX5475 are
3-terminal potentiometers in 8-pin SOT23 packages.
The MAX5471/MAX5474 have an end-to-end resistance
of 50k, and the MAX5472/MAX5475 have an end-
to-end resistance of 100k. All of these devices have
32 wiper positions, a low ratiometric temperature coeffi-
cient (5ppm/°C), and all operate from a single +2.7V to
+5.25V supply. Each device is guaranteed over the
extended -40°C to +85°C temperature range.
Applications
Mechanical Potentiometer Replacement
Liquid-Crystal-Display (LCD) Screen Adjustment
Audio Volume Control
Programmable Filters
Features
o Wiper Position Stored in Nonvolatile Memory and
Recalled Upon Power-Up
o Tiny SOT23 Package
o 35ppm/°C End-to-End Resistance Temperature
Coefficient
o 5ppm/°C Ratiometric Temperature Coefficient
o 32 Tap Positions
o Voltage-Divider or Variable-Resistor
Potentiometer Configuration
o 50kand 100kEnd-to-End Resistance Values
o 1µA (max) Static Supply Current
o 2.7V to 5.25V Single-Supply Operation
o 200,000 Wiper Store Cycles
o 50-Year Wiper Data Retention
PART
MAX5471EZT-T
MAX5472EZT-T
MAX5474EKA-T
MAX5475EKA-T
Ordering Information
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
6 Thin SOT23-6
6 Thin SOT23-6
8 SOT23-8
8 SOT23-8
Pin Configurations
TOP VIEW
CS 1
6 VDD
CS 1
8L
GND 2
5 H VDD 2
7W
U/D 3
MAX5471
MAX5472
SOT23-6
4 INC GND 3
U/D 4
6H
MAX5474
MAX5475
SOT23-8
5 INC
PART
MAX5471EZT
MAX5472EZT
MAX5474EKA
MAX5475EKA
Selector Guide
END-TO-END
RESISTANCE (k)
50
100
50
100
TOP MARK
ABQN
ABQM
AEIZ
AEIY
________________________________________________________________ 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.



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32-Tap, Nonvolatile, Linear-Taper Digital
Potentiometers in SOT23
ABSOLUTE MAXIMUM RATINGS
VDD to GND ...........................................................-0.3V to +6.0V
All Other
Pins to GND .........-0.3V to the lower of (VDD + 0.3V) or +6.0V
Maximum Continuous Current into H, L, and W
MAX5471/MAX5474 .....................................................±1.3mA
MAX5472/MAX5475 .....................................................±0.6mA
Continuous Power Dissipation (TA = +70°C)
6-Pin SOT23 (derate 9.1mW/°C above +70°C)............727mW
8-Pin SOT23 (derate 8.9mW/°C above +70°C)............714mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-60°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
(VDD = +2.7V to +5.25V, VH = VDD, VL = GND, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VDD = +5.0V, TA
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
DC PERFORMANCE
Resolution
End-to-End Resistance
SYMBOL
CONDITIONS
N
MAX5471/MAX5474
MAX5472/MAX5475
MIN TYP MAX UNITS
32 Tap
37.5 50 62.5
75 100 125
k
End-to-End Resistance
Temperature Coefficient
TCR
35 ppm/°C
Ratiometric Resistance
Temperature Coefficient
5 ppm/°C
Integral Nonlinearity
Differential Nonlinearity
INL
DNL
Variable-resistor mode (Note 2)
Voltage-divider mode (MAX5474/MAX5475)
(Note 3)
Variable-resistor mode (Note 2)
Voltage-divider mode (MAX5474/MAX5475)
(Note 3)
±0.5
±0.1
±0.5
±0.1
±1.0
±0.5
±1.0
±0.5
LSB
LSB
Full-Scale Error
Zero-Scale Error
Wiper Resistance
RW
DIGITAL INPUTS (CS, U/D, INC) (Note 5)
Input High Voltage
VIH
Input Low Voltage
Input Current
DYNAMIC CHARACTERISTICS
Wiper -3dB Bandwidth (Note 6)
VIL
IIN
MAX5474/MAX5475
MAX5474/MAX5475
MAX5474/MAX5475 (Note 4)
VDD < 3.6V
VDD 3.6V
VDD < 3.6V
VDD 3.6V
MAX5471/MAX5474
MAX5472/MAX5475
-0.5 LSB
+0.5 LSB
600 1200
0.7 x VDD
2.4
0.3 x VDD
0.8
±0.1
±1
V
V
µA
400
kHz
200
2 _______________________________________________________________________________________



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32-Tap, Nonvolatile, Linear-Taper Digital
Potentiometers in SOT23
ELECTRICAL CHARACTERISTICS (continued)
(VDD = +2.7V to +5.25V, VH = VDD, VL = GND, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VDD = +5.0V, TA
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
TIMING CHARACTERISTICS (Figure 1, Note 7)
CS to INC Setup
INC High to U/D Change
U/D to INC Setup
INC Low Period
INC High Period
INC Cycle Time
INC Inactive to CS Inactive
INC Active to CS Inactive
CS Deselect Time (Store)
tCI
tID
tDI
tIL
tIH
tCYC
tIC
tIK
tCPH
Wiper Settling Time
Power-Up to Wiper Stable
tIW (Note 8)
tPU
Wiper Store Cycle
tWSC
NONVOLATILE MEMORY RELIABILITY
Data Retention
TA = +85°C
Endurance
POWER SUPPLY
TA = +85°C
Supply Voltage
Supply Current
VDD
IDD Write to memory
Static Supply Current
ISD TA = +25°C (Note 9)
MIN TYP MAX UNITS
50
0
100
50
50
100
100
100
100
1
1
12
ns
ns
ns
ns
ns
ns
ns
ns
ns
µs
µs
ms
50
200,000
Year
Store
2.70
0.35
5.25
400
1
V
µA
µA
Note 1: All devices are production tested at TA = +25°C and are guaranteed by design and characterization for -40°C < TA < +85°C.
Note 2: The DNL and INL are measured with the potentiometer configured as a variable resistor. For the 3-terminal potentiometers
(MAX5474/MAX5475), H is unconnected and L = GND. At VDD = 5.25V, W is driven with a source current of 80µA for the
50kconfiguration, and 40µA for the 100kconfiguration. At VDD = 2.7V, the wiper terminal is driven with a source current
of 40µA for the 50kconfiguration, and 20µA for the 100kconfiguration.
Note 3: The DNL and INL are measured with the potentiometer configured as a voltage-divider with H = VDD and L = GND
(MAX5474/MAX5475 only). The wiper terminal is unloaded.
Note 4: The wiper resistance is the worst value measured by injecting the currents given in Note 2 into W with L = GND.
RW = (VW - VH) / IW.
Note 5: The device draws higher supply current when digital inputs are driven with voltages between 0.3V x VDD and 0.7 x VDD.
Drive the digital inputs as close as possible to VDD or GND. (See the Typical Operating Characteristics for the Supply
Current vs. Digital Input Voltage graph.)
Note 6: Wiper at midscale with a 10pF load.
Note 7: Digital timing is guaranteed by design and characterization, and is not production tested.
Note 8: Wiper settling time is the worst-case 0% to 50% rise time measured between consecutive wiper positions. H = VDD, L =
GND, and the wiper terminal is unloaded and measured with a 10pF oscilloscope probe (see the Typical Operating
Characteristics for the Tap-to-Tap Switching Transient).
Note 9: Digital inputs CS, U/D, and INC are connected to GND or VDD. See the Typical Operating Characteristics for the Static
Supply Current vs. Temperature graph.
_______________________________________________________________________________________ 3



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32-Tap, Nonvolatile, Linear-Taper Digital
Potentiometers in SOT23
(VDD = 5.0V, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics
SUPPLY CURRENT vs. SUPPLY VOLTAGE
0.5
DIGITAL INPUTS = GND OR VDD
0.4
0.3
STATIC SUPPLY CURRENT
vs. TEMPERATURE
0.5
DIGITAL INPUTS = GND OR VDD
0.4
VDD = 5.0V
0.3
10,000
1000
100
SUPPLY CURRENT
vs. DIGITAL INPUT VOLTAGE
VDD = 5.0V
0.2 0.2
10
VDD = 3.0V
0.1 0.1
1 VDD = 3.0V
0
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
SUPPLY VOLTAGE (V)
600
550
500
450
400
350
300
250
200
0
WIPER RESISTANCE
vs. TAP POSITION (MAX5474)
VDD = 3.0V
VDD = 5.0V
5 10 15 20 25 30
TAP POSITION
W-TO-L RESISTANCE
vs. TAP POSITION
100
80
MAX5475
60
40
MAX5474
20
0
0 5 10 15 20 25 30
TAP POSITION
0
-40
-15 10 35 60
TEMPERATURE (°C)
85
0.1
0
1234
DIGITAL INPUT VOLTAGE (V)
5
600
550
500
450
400
350
300
250
200
0
WIPER RESISTANCE
vs. TAP POSITION (MAX5475)
VDD = 3.0V
VDD = 5.0V
5 10 15 20 25 30
TAP POSITION
END-TO-END RESISTANCE % CHANGE
vs. TEMPERATURE
0.20
0.15
50k
0.10
0.05
0 100k
-0.05
100k
-0.10
-0.15 50k
-0.20
-40
-15 10 35 60
TEMPERATURE (°C)
85
H-TO-GND RESISTANCE
vs. TAP POSITION
100
80
MAX5472
60
40
TAP-TO-TAP SWITCHING TRANSIENT
INC
5V/div
W
100mV/div
MAX5474
MAX5471
20
0
0 5 10 15 20 25 30
TAP POSITION
CL = 10pF
VH = VDD
TAP 16 TO TAP 15
400ns/div
MAX5475
4 _______________________________________________________________________________________



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