MAXIM MAX5475EKA

KIT
ATION
EVALU
E
L
B
A
IL
AVA
19-3067; Rev 1; 2/06
32-Tap, Nonvolatile, Linear-Taper Digital
Potentiometers in SOT23
The MAX5471/MAX5472/MAX5474/MAX5475 lineartaper digital potentiometers function as mechanical
potentiometers, but replace the mechanics with a simple 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 50kΩ, and the MAX5472/MAX5475 have an endto-end resistance of 100kΩ. All of these devices have
32 wiper positions, a low ratiometric temperature coefficient (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
Features
♦ Wiper Position Stored in Nonvolatile Memory and
Recalled Upon Power-Up
♦ Tiny SOT23 Package
♦ 35ppm/°C End-to-End Resistance Temperature
Coefficient
♦ 5ppm/°C Ratiometric Temperature Coefficient
♦ 32 Tap Positions
♦ Voltage-Divider or Variable-Resistor
Potentiometer Configuration
♦ 50kΩ and 100kΩ End-to-End Resistance Values
♦ 1µA (max) Static Supply Current
♦ 2.7V to 5.25V Single-Supply Operation
♦ 200,000 Wiper Store Cycles
♦ 50-Year Wiper Data Retention
Mechanical Potentiometer Replacement
Ordering Information
Liquid-Crystal-Display (LCD) Screen Adjustment
Audio Volume Control
PART
Programmable Filters
TEMP
RANGE
MAX5471EZT-T
-40°C to +85°C 6 Thin SOT23-6
Z6-1
MAX5472EZT-T
-40°C to +85°C 6 Thin SOT23-6
Z6-1
MAX5474EKA-T -40°C to +85°C 8 SOT23-8
K8S-3
MAX5475EKA-T -40°C to +85°C 8 SOT23-8
K8S-3
Pin Configurations
Selector Guide
PART
TOP VIEW
6 VDD
CS 1
GND 2
U/D 3
5 H
MAX5471
MAX5472
4 INC
VDD 2
7 W
GND 3
6 H
U/D 4
SOT23-6
8 L
CS 1
MAX5474
MAX5475
PKG
CODE
PIN-PACKAGE
END-TO-END
RESISTANCE (kΩ)
TOP MARK
MAX5471EZT
50
ABQN
MAX5472EZT
100
ABQM
MAX5474EKA
50
AEIZ
MAX5475EKA
100
AEIY
5 INC
SOT23-8
________________________________________________________________ Maxim Integrated Products
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.
1
MAX5471/MAX5472/MAX5474/MAX5475
General Description
MAX5471/MAX5472/MAX5474/MAX5475
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
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DC PERFORMANCE
Resolution
N
End-to-End Resistance
End-to-End Resistance
Temperature Coefficient
32
37.5
50
62.5
MAX5472/MAX5475
75
100
125
TCR
Ratiometric Resistance
Temperature Coefficient
Integral Nonlinearity
Differential Nonlinearity
INL
DNL
Full-Scale Error
ppm/°C
5
ppm/°C
Variable-resistor mode (Note 2)
±0.5
±1.0
Voltage-divider mode (MAX5474/MAX5475)
(Note 3)
±0.1
±0.5
Variable-resistor mode (Note 2)
±0.5
±1.0
Voltage-divider mode (MAX5474/MAX5475)
(Note 3)
±0.1
±0.5
MAX5474/MAX5475
RW
MAX5474/MAX5475 (Note 4)
kΩ
35
MAX5474/MAX5475
Zero-Scale Error
Wiper Resistance
Tap
MAX5471/MAX5474
600
LSB
LSB
-0.5
LSB
+0.5
LSB
1200
Ω
DIGITAL INPUTS (CS, U/D, INC) (Note 5)
Input High Voltage
VIH
Input Low Voltage
VIL
Input Current
IIN
VDD < 3.6V
VDD ≥ 3.6V
0.7 x VDD
V
2.4
VDD < 3.6V
0.3 x VDD
VDD ≥ 3.6V
0.8
±0.1
±1
V
µA
DYNAMIC CHARACTERISTICS
Wiper -3dB Bandwidth (Note 6)
2
MAX5471/MAX5474
400
MAX5472/MAX5475
200
_______________________________________________________________________________________
kHz
32-Tap, Nonvolatile, Linear-Taper Digital
Potentiometers in SOT23
(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
MIN
TYP
MAX
UNITS
TIMING CHARACTERISTICS (Figure 1, Note 7)
CS to INC Setup
tCI
50
ns
INC High to U/D Change
tID
0
ns
U/D to INC Setup
tDI
100
ns
INC Low Period
tIL
50
ns
INC High Period
tIH
50
ns
INC Cycle Time
tCYC
100
ns
INC Inactive to CS Inactive
tIC
100
ns
INC Active to CS Inactive
tIK
100
ns
CS Deselect Time (Store)
tCPH
Wiper Settling Time
tIW
Power-Up to Wiper Stable
tPU
Wiper Store Cycle
100
(Note 8)
tWSC
ns
1
µs
1
µs
12
ms
NONVOLATILE MEMORY RELIABILITY
Data Retention
Endurance
TA = +85°C
50
TA = +25°C
200,000
TA = +85°C
50,000
Year
Store
POWER SUPPLY
Supply Voltage
VDD
Supply Current
IDD
Write to memory
2.70
Static Supply Current
ISD
TA = +25°C (Note 9)
0.35
5.25
V
400
µA
1
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
50kΩ configuration, and 40µA for the 100kΩ configuration. At VDD = 2.7V, the wiper terminal is driven with a source current
of 40µA for the 50kΩ configuration, and 20µA for the 100kΩ configuration.
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
MAX5471/MAX5472/MAX5474/MAX5475
ELECTRICAL CHARACTERISTICS (continued)
Typical Operating Characteristics
(VDD = 5.0V, TA = +25°C, unless otherwise noted.)
STATIC SUPPLY CURRENT
vs. TEMPERATURE
0.3
0.2
0.1
VDD = 5.0V
0.3
0.2
VDD = 3.0V
3.1
3.5
3.9
4.3
4.7
5.1
5.5
10
VDD = 3.0V
0.1
-40
-15
10
35
60
85
0
1
2
3
4
5
TEMPERATURE (°C)
DIGITAL INPUT VOLTAGE (V)
WIPER RESISTANCE
vs. TAP POSITION (MAX5474)
WIPER RESISTANCE
vs. TAP POSITION (MAX5475)
END-TO-END RESISTANCE % CHANGE
vs. TEMPERATURE
400
VDD = 3.0V
350
VDD = 5.0V
250
500
450
VDD = 5.0V
400
350
300
250
200
200
10
15
20
25
30
0.05
0
100kΩ
100kΩ
-0.05
-0.10
50kΩ
-0.15
5
10
15
20
25
30
-40
-15
10
35
60
TAP POSITION
TEMPERATURE (°C)
W-TO-L RESISTANCE
vs. TAP POSITION
H-TO-GND RESISTANCE
vs. TAP POSITION
TAP-TO-TAP SWITCHING TRANSIENT
MAX5475
60
40
MAX5474
20
0
MAX5471 toc08
MAX5471 toc07
80
100
80
15
20
TAP POSITION
25
30
INC
5V/div
MAX5472
60
W
100mV/div
40
MAX5474
MAX5471
MAX5475
20
CL = 10pF
VH = VDD
TAP 16 TO TAP 15
0
10
85
MAX5471 toc09
TAP POSITION
100
5
50kΩ
0.10
-0.20
0
H-TO-GND RESISTANCE (kΩ)
5
0.15
MAX5471 toc06
VDD = 3.0V
0.20
END-TO-END RESISTANCE % CHANGE
450
300
550
WIPER RESISTANCE (Ω)
500
MAX5471 toc05
600
MAX5471 toc04
550
0
100
SUPPLY VOLTAGE (V)
600
0
VDD = 5.0V
1
0
2.7
WIPER RESISTANCE (Ω)
1000
0.1
0
4
10,000
MAX5471 toc03
0.4
SUPPLY CURRENT (μA)
0.4
DIGITAL INPUTS = GND OR VDD
SUPPLY CURRENT (μA)
DIGITAL INPUTS = GND OR VDD
SUPPLY CURRENT (μA)
0.5
MAX5471 toc01
0.5
SUPPLY CURRENT
vs. DIGITAL INPUT VOLTAGE
MAX5471 toc02
SUPPLY CURRENT vs. SUPPLY VOLTAGE
W-TO-L RESISTANCE (kΩ)
MAX5471/MAX5472/MAX5474/MAX5475
32-Tap, Nonvolatile, Linear-Taper Digital
Potentiometers in SOT23
0
5
10
15
20
25
30
400ns/div
TAP POSITION
_______________________________________________________________________________________
32-Tap, Nonvolatile, Linear-Taper Digital
Potentiometers in SOT23
WIPER TRANSIENT AT POWER-ON
(MAX5475)
VDD
W
W
1V/div
1V/div
CL = 10pF
TAP 16
VH = VDD
CL = 10pF
TAP 16
VH = VDD
MAX5474
-6
-9
MAX5475
-12
-15
-18
1
1.0μs/div
1.0μs/div
TAP = 16
CL = 10pF
-3
WIPER RESPONSE (dB)
5V/div
5V/div
MAX5471toc12
VDD
WIPER RESPONSE vs. FREQUENCY
0
MAX5471 toc11
MAX5471 toc10
WIPER TRANSIENT AT POWER-ON
(MAX5474)
10
100
1000
FREQUENCY (kHz)
RESISTANCE INL vs. TAP POSITION
(MAX5471)
VARIABLE-RESISTOR MODE
0.1
0
-0.1
VARIABLE-RESISTOR MODE
0.2
RESISTANCE DNL
0.4
RESISTANCE INL
0.2
0.3
MAX5471 toc14
VARIABLE-RESISTOR MODE
0.3
0.2
0.1
0
-0.2
-0.1
-0.3
5
10
15
20
25
5
10
15
20
25
30
0
10
15
20
25
30
TAP POSITION
TAP POSITION
RESISTANCE INL vs. TAP POSITION
(MAX5472)
RESISTANCE DNL vs. TAP POSITION
(MAX5474)
RESISTANCE INL vs. TAP POSITION
(MAX5474)
0.04
MAX5471 toc16
VARIABLE-RESISTOR MODE
0.4
VOLTAGE-DIVIDER MODE
0.04
0.03
VOLTAGE-DIVIDER MODE
0.03
0.3
0.2
0.1
0
-0.1
0.02
RESISTANCE INL
RESISTANCE DNL
0.02
RESISTANCE INL
5
TAP POSITION
0.5
0.01
0
-0.01
5
10
15
20
TAP POSITION
25
30
0.01
0
-0.01
-0.02
-0.02
-0.03
-0.03
-0.04
0
-0.1
-0.3
0
30
0
MAX5471 toc18
0
0.1
-0.2
MAX5471 toc17
RESISTANCE DNL
0.5
MAX5471 toc13
0.3
RESISTANCE DNL vs. TAP POSITION
(MAX5472)
MAX5471 toc15
RESISTANCE DNL vs. TAP POSITION
(MAX5471)
-0.04
0
5
10
15
20
TAP POSITION
25
30
0
5
10
15
20
25
30
TAP POSITION
_______________________________________________________________________________________
5
MAX5471/MAX5472/MAX5474/MAX5475
Typical Operating Characteristics (continued)
(VDD = 5.0V, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
(VDD = 5.0V, TA = +25°C, unless otherwise noted.)
RESISTANCE DNL vs. TAP POSITION
(MAX5475)
RESISTANCE INL vs. TAP POSITION
(MAX5475)
VOLTAGE-DIVIDER MODE
0.03
MAX5471 toc20
0.04
MAX5471 toc19
0.04
VOLTAGE-DIVIDER MODE
0.03
0.02
0.02
RESISTANCE INL
RESISTANCE DNL
MAX5471/MAX5472/MAX5474/MAX5475
32-Tap, Nonvolatile, Linear-Taper Digital
Potentiometers in SOT23
0.01
0
-0.01
0.01
0
-0.01
-0.02
-0.02
-0.03
-0.03
-0.04
-0.04
0
5
10
15
20
25
30
0
5
TAP POSITION
10
15
20
25
30
TAP POSITION
Pin Description
PIN
MAX5471/
MAX5472
MAX5474/
MAX5475
NAME
1
1
CS
2
3
GND
Ground
3
4
U/D
Up/Down Control Input. With U/D low, a high-to-low INC transition decrements the wiper
position. With U/D high, a high-to-low INC transition increments the wiper position.
4
5
INC
Wiper Increment Control Input. With CS low, the wiper position moves in the direction
determined by the state of U/D on a high-to-low transition.
5
6
H
6
FUNCTION
Chip-Select Input. Drive low to change wiper position (W) through INC and U/D. A low-tohigh transition with INC high stores the wiper position in nonvolatile memory.
High Terminal of Resistor. The voltage at H can be greater than or less than the voltage at L.
Current can flow into or out of H.
6
2
VDD
—
7
W
Wiper Terminal of Resistor
Power Supply
—
8
L
Low Terminal of Resistor. The voltage at L can be greater than or less than the voltage at H.
Current can flow into or out of L.
_______________________________________________________________________________________
32-Tap, Nonvolatile, Linear-Taper Digital
Potentiometers in SOT23
WIPER POSITION
NOT STORED
CS
tCYC
tCI
tIC
tIH
tIL
tCPH
tIK
INC
tID
tDI
tWSC
U/D
tIW
VW
NOTE: VW IS NOT A DIGITAL SIGNAL. IT REPRESENTS A WIPER TRANSITION.
Figure 1. Digital Interface and Timing Diagram
Detailed Description
The MAX5471/MAX5472/MAX5474/MAX5475 contain a
resistor array with 31 resistive elements (Figures 2 and
3). The MAX5471/MAX5474 have a total end-to-end
resistance of 50kΩ, and the MAX5472/MAX5475 have
an end-to-end resistance of 100kΩ. The MAX5471/
MAX5472 wiper is connected to the high terminal, and
the low terminal is internally connected to ground, making the device a variable resistor. The MAX5474/
MAX5475 allow access to the high, low, and wiper terminals for a standard voltage-divider configuration.
The wiper is moved among the 32 tap points through a
simple 3-wire interface. Nonvolatile memory allows the
wiper position to be stored and recalled to the same
point upon power-up.
Digital Interface
Logic inputs CS, U/D, and INC control the wiper position and store it in nonvolatile memory (see the Truth
Table). The chip-select (CS) input enables the serial
interface when low and disables the interface when
high. The position of the wiper is stored when CS transitions from low to high and INC is high (see the Storing
Wiper Position section).
With the serial interface active (CS low), a high-to-low
(falling edge) transition on INC moves the wiper position by one resistive element in the direction determined by the state of U/D. If U/D is high, the wiper
increments and it increases the resistance between W
and L (it decreases the resistance between H and W).
If U/D is low, the wiper decrements and it decreases
the resistance between W and L (it increases the resistance between H and W). The direction of the wiper
(state of U/D) can be changed at any time as long as
the setup and hold times are met.
Since the MAX5471/MAX5472 have the wiper internally
connected to H, an increment command increases the
resistance between H and GND, and a decrement command decreases the resistance between H and GND.
The wiper performs a make-before-break transition,
ensuring that there is never an open circuit during a
transition from one resistor tap to another. When the
wiper is at either end of the resistor array (max/min),
additional transitions in the direction of the endpoint do
not change the counter value (the wiper does not wrap
around).
Storing Wiper Position
The position of the wiper is stored in nonvolatile memory whenever CS transitions low-to-high (rising edge)
while INC is high. Upon power-up, the wiper returns to
this stored position. By keeping INC low while taking
CS high, the serial interface can be disabled and the
potentiometer placed in standby without storing the latest wiper position. The factory-default wiper position
is midscale.
These devices can also be operated like a one-time
programmable (OTP) device. Once the desired wiper
position is trimmed and stored in nonvolatile memory,
disable the serial interface by connecting CS to VDD,
and INC to GND. The disabled interface places the
device in standby and disallows any changes to the
wiper position. In OTP mode, these devices become a
fixed 3-terminal potentiometer or a 1-terminal resistor to
GND with less than 1µA of supply current.
_______________________________________________________________________________________
7
MAX5471/MAX5472/MAX5474/MAX5475
WIPER POSITION
STORED
MAX5471/MAX5472/MAX5474/MAX5475
32-Tap, Nonvolatile, Linear-Taper Digital
Potentiometers in SOT23
Applications Information
Truth Table
CS
U/D
INC
W
L
L
↓
Decrement
L
H
↓
Increment
L
X
↑
No change
H
X
X
No change
↓
X
X
No change
↑
X
L
Position not stored
↑
X
H
Position stored
↓ = High-to-low transition.
↑ = Low-to-high transition.
X = Don’t care.
Standby Mode
The MAX5471/MAX5472/MAX5474/MAX5475 are
always in standby mode, except during the transition of
a logic input or while the wiper position is being stored.
When in standby mode, the static supply current is
reduced to less than 1µA and the resistive terminals (H,
W, and L) are unaffected.
The MAX5471/MAX5472/MAX5474/MAX5475 are
intended for circuits requiring digitally controlled
adjustable resistance, such as LCD contrast control
(where voltage biasing adjusts the display contrast), or
programmable filters with adjustable gain and/or cutoff
frequency.
Positive LCD Bias Control
Figures 4 and 5 show an application where the voltagedivider or variable resistor is used to make an
adjustable, positive LCD-bias voltage. The op amp provides buffering and gain to the resistor-divider network
made by the potentiometer (Figure 4) or to a fixed
resistor and a variable resistor (Figure 5).
Programmable Filter
Figure 6 shows the configuration of a 1st-order programmable filter. The gain of the filter is adjusted by
R2, and the cutoff frequency is adjusted by R3. Use the
following equations to calculate the gain (G) and the
3dB cutoff frequency (fC):
R1
R2
1
fC =
2π × R 3 × C
G = 1+
H
6
H
5
S32
MAX5474
MAX5475
S32
MAX5471
MAX5472
VDD
GND
R31
VDD
6
GND
S31
2
R30
CS
CS
INC
U/D
1
4
3
UP/DOWN
COUNTER
S30
32-POSITION
DECODER
RW
INC
U/D
R31
2
S31
3
R30
1
5
4
UP/DOWN
COUNTER
S30
32-POSITION
DECODER
S3
S3
NONVOLATILE
MEMORY
R2
NONVOLATILE
MEMORY
R2
S2
S2
R1
R1
S1
8
S1
L
Figure 2. MAX5471/MAX5472 Functional Diagram
8
Figure 3. MAX5474/MAX5475 Functional Diagram
_______________________________________________________________________________________
RW
7
W
32-Tap, Nonvolatile, Linear-Taper Digital
Potentiometers in SOT23
VIN
H
30V
H
VOUT
W
VOUT
R3
MAX5474
MAX5475
R1
MAX5471
MAX5472
L
H
GND
R2
Figure 4. Positive LCD Bias Control Using a Voltage-Divider
MAX5471
MAX5472
GND
5V
30V
Figure 6. Programmable Filter
VOUT
H
MAX5471
MAX5472
GND
Chip Information
TRANSISTOR COUNT: 5031
PROCESS: BiCMOS
Figure 5. Positive LCD Bias Control Using a Variable Resistor
_______________________________________________________________________________________
9
MAX5471/MAX5472/MAX5474/MAX5475
C
5V
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
6L THIN SOT23.EPS
MAX5471/MAX5472/MAX5474/MAX5475
32-Tap, Nonvolatile, Linear-Taper Digital
Potentiometers in SOT23
10
______________________________________________________________________________________
32-Tap, Nonvolatile, Linear-Taper Digital
Potentiometers in SOT23
______________________________________________________________________________________
11
MAX5471/MAX5472/MAX5474/MAX5475
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
SOT23, 8L.EPS
MAX5471/MAX5472/MAX5474/MAX5475
32-Tap, Nonvolatile, Linear-Taper Digital
Potentiometers in SOT23
MARKING
0
0
PACKAGE OUTLINE, SOT-23, 8L BODY
21-0078
G
1
1
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