19-2657; Rev 3; 9/04
±15V, 128-Tap, Low-Drift Digital Potentiometers
General Description
The MAX5436–MAX5439 are 128-tap high-voltage (±5V
to ±15V) digital potentiometers in packages that are half
the size of comparable devices in 8-pin SO. They perform
the same function as mechanical potentiometers, but
replace the mechanics with a simple digital interface. The
digital logic is powered by a separate single +2.7V to
+5.25V supply voltage (V
CC
). The resistor string uses its
own analog supplies (V
DD
and V
SS
) that require
V
DD
- V
SS
to be greater than 9V and less than 31.5V. This
allows for greater flexibility in voltage ranges that can be
used with these devices. Examples of analog supply
ranges include not only dual voltages of ±5V to ±15V, but
single-supply voltages, such as +10V, +15V, +30V, -30V,
and more, as long as the ranges of V
DD
- V
SS
and V
CC
-
V
SS
are met.
The MAX5437/MAX5439 include an on-chip, high-
voltage, uncommitted amplifier, providing additional
reductions in board space and cost. Other features
include low 35ppm/°C end-to-end and 5ppm/°C ratio-
metric resistor temperature coefficients, a 3-wire SPI™/
QSPI™/MICROWIRE™-compatible serial interface, and
a power-on reset to midscale.
The MAX5436/MAX5438 are available in 10-pin µMAX
packages. The MAX5437/MAX5439 are available in 14-
pin TSSOP package. Each device is guaranteed over
the extended temperature range of -40°C to +85°C.
Features
♦
+10V to +30V Single-Supply Operation
♦
-28V to -10V Single Negative Supply Operation
♦
±5V to ±15V Dual-Supply Operation
♦
128 Tap Positions
♦
Uncommitted High-Voltage Amplifier
(MAX5437/MAX5439)
♦
Low Temperature Coefficient
35ppm/°C (End-to-End)
5ppm/°C (Ratiometric)
♦
Small-Footprint Packages
10-Pin µMAX (MAX5436/MAX5438)
14-Pin TSSOP (MAX5437/MAX5439)
♦
Glitchless Switching Between the Resistor Taps
♦
3-Wire SPI/QSPI/MICROWIRE-Compatible Serial
Interface
♦
50kΩ/100kΩ End-to-End Resistances
♦
Power-On Reset: Wiper Goes to Midscale
(Position 64)
MAX5436–MAX5439
Ordering Information
PART
MAX5436EUB
TEMP RANGE
PIN-
PACKAGE
RESISTANCE
(kΩ)
50
50
100
100
-40°C to +85°C 10 µMAX
-40°C to +85°C 14 TSSOP
-40°C to +85°C 10 µMAX
-40°C to +85°C 14 TSSOP
Applications
LCD Screen Contrast Adjustment
Data-Acquisition Systems
Mechanical Potentiometer Replacement
Low-Drift Programmable Gain Amplifier
Audio Volume Control
MAX5437EUD
MAX5438EUB
MAX5439EUD
Pin Configurations
TOP VIEW
SCLK 1
DIN 2
CS 3
GND 4
V
SS
5
10 V
CC
9 L
SCLK 1
DIN 2
CS 3
SHDN 4
GND 5
V
SS
6
OUT 7
14 V
CC
13 L
12 W
MAX5436
MAX5438
8 W
7 H
6 V
DD
MAX5437
MAX5439
11 H
10 V
DD
9 IN+
8 IN-
μMAX
SPI/QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
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.
±15V, 128-Tap, Low-Drift Digital Potentiometers
MAX5436–MAX5439
ABSOLUTE MAXIMUM RATINGS
V
DD
to GND, V
SS
= GND........................................-0.3V to +34V
V
SS
to GND, V
DD
= GND........................................-34V to +0.3V
V
DD
to V
SS
..............................................................-0.3V to +34V
V
DD
to V
CC
........................................................-6.3V to +28.75V
V
CC
to V
SS
..............................................................-0.3V to +34V
V
CC
to GND ..............................................................-0.3V to +6V
DIN, SCLK,
CS, SHDN
...............................-0.3V to (V
CC
+ 0.3V)
H, L, W, IN+, IN-, OUT .....................(V
SS
- 0.3V) to (V
DD
+ 0.3V)
Maximum Continuous Current into H, L, and W
MAX5436–MAX5439.......................................................±1mA
Continuous Power Dissipation (T
A
= +70°C)
10-Pin µMAX (derate 6.94mW/°C above +70°C) .........556mW
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
= +15V, V
SS
= -15V, V
CC
= +5V, V
H
= V
DD
, V
L
= V
SS
, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at
T
A
= +25°C, unless otherwise noted.)
PARAMETER
Resolution
Integral Nonlinearity
Differential Nonlinearity
End-to-End Resistor Tempco
Ratiometric Resistor Tempco
Full-Scale Error
Zero-Scale Error
Full-Scale Error
Zero-Scale Error
DC PERFORMANCE (variable-resistor mode)
Resolution
Integral Nonlinearity
Differential Nonlinearity
Wiper Resistance
Wiper Capacitance
End-to-End Resistance
DIGITAL INPUTS
Input High Voltage
Input Low Voltage
V
CC
= 4.75V to 5.25V (Note 4)
V
CC
= 4.75V to 5.25V
2.4
0.8
V
V
2
N
INL
DNL
W
R
W
C
R
HL
(Note 2)
(Note 2)
(Note 3)
Midscale
MAX5438/MAX5439
MAX5436/MAX5437
75
37.5
0.9
6
100
50
125
62.5
128
±1
±1
2
Taps
LSB
LSB
kΩ
pF
kΩ
R
HL
= 50kΩ (MAX5436/MAX5437)
R
HL
= 50kΩ (MAX5436/MAX5437)
R
HL
= 100kΩ (MAX5438/MAX5439)
R
HL
= 100kΩ (MAX5438/MAX5439)
SYMBOL
2
N
INL
DNL
TC
R
(Note 1)
(Note 1)
35
5
-0.3
+0.3
-0.15
+0.15
CONDITIONS
MIN
128
±1
±1
TYP
MAX
UNITS
Taps
LSB
LSB
ppm/°C
ppm/°C
LSB
LSB
LSB
LSB
DC PERFORMANCE (voltage-divider mode)
DC PERFORMANCE (resistor characteristics)
2
_______________________________________________________________________________________
±15V, 128-Tap, Low-Drift Digital Potentiometers
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +15V, V
SS
= -15V, V
CC
= +5V, V
H
= V
DD
, V
L
= V
SS
, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at
T
A
= +25°C, unless otherwise noted.)
PARAMETER
Input High Voltage
Input Low Voltage
Input Leakage Current
Input Capacitance
DYNAMIC CHARACTERISTICS (analog)
R
HL
= 50kΩ, midscale, V
H
= 1.5V
P-P
,
C
WIPER
= 20pF, voltage-divider mode
R
HL
= 100kΩ, midscale, V
H
= 1.5V
P-P
,
C
WIPER
= 20pF, voltage-divider mode
C
WIPER
= 20pF, code 1 to code 127, settle
to 0.5LSB
400
kHz
200
5
µs
5.0
SYMBOL
CONDITIONS
V
CC
= 2.7V to 3.6V
V
CC
= 2.7V to 3.6V
MIN
2.0
0.6
±1.0
TYP
MAX
UNITS
V
V
µA
pF
MAX5436–MAX5439
Wiper -3dB Bandwidth
BW
W
Wiper Settling Time
t
IL
AMPLIFIER CHARACTERISTICS (analog)
Input Bias Current
Input Offset Voltage
Offset-Voltage Temperature Drift
Input Offset Current
Unity-Gain Bandwidth
Slew Rate
Large-Signal Voltage Gain
Input Noise
Input Compliance
Output Compliance
DC CMRR
DC PSRR
SCLK Clock 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
Positive Analog Supply Voltage
Negative Analog Supply Voltage
V
DD
V
SS
0
-28.8
31.5
0
V
V
I
B
V
OS
V
OSD
I
OS
UBW
A
SR
A
VO
V
N
CMR
I
CMR
O
CMRR
PSRR
f
CLK
t
CP
t
CH
t
CL
t
CSS
t
CSH
t
DS
t
DH
t
CSO
t
CS1
t
CSW
0
100
40
40
40
10
40
0
10
40
100
I
LOAD
= ±5mA
R
LOAD
= 100kΩ, V
OUT
=
±14V
f = 1kHz
V
SS
+ 1
V
SS
+ 1
68
70
10
C
LOAD
= 250pF
15
±6
10
2
100
0.25
100
110
V
DD
- 2
V
DD
- 1
nA
mV
µV/°C
nA
kHz
V/µs
V/mV
nV/√Hz
V
V
dB
dB
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
TIMING CHARACTERISTICS (digital)
(Note 5, Figure 3)
_______________________________________________________________________________________
3
±15V, 128-Tap, Low-Drift Digital Potentiometers
MAX5436–MAX5439
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +15V, V
SS
= -15V, V
CC
= +5V, V
H
= V
DD
, V
L
= V
SS
, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at
T
A
= +25°C, unless otherwise noted.)
PARAMETER
Analog Supply Separation
Digital Supply Voltage
Digital Supply to Negative Analog
Supply Separation
Power-On Reset Threshold
Digital Supply Current
Positive Analog Supply Current
SYMBOL
V
DS
V
CC
V
CS
POR
I
CC
I
DD
(Note 4)
MAX5436/MAX5438
SHDN
= GND for MAX5437/MAX5439
SHDN
= V
CC
Negative Analog Supply Current
I
SS
MAX5436/MAX5438
SHDN
= GND for MAX5437/MAX5439
SHDN
= V
CC
V
CC
- V
SS
V
DD
- V
SS
CONDITIONS
MIN
9.0
2.70
2.7
1.6
30
30
105
55
130
50
60
215
110
250
µA
TYP
MAX
31.5
5.25
31.5
UNITS
V
V
V
V
µA
µA
Note 1:
The DNL and INL are measured with the potentiometer configured as a voltage-divider with H = V
DD
and L = V
SS
. The
wiper terminal is unloaded.
Note 2:
The DNL and INL are measured with the potentiometer configured as a variable resistor. H is unconnected and L = V
SS
.
The wiper terminal is driven with a source current of 80µA for the 50kΩ configuration and 40µA for the 100kΩ configuration.
Note 3:
The wiper resistance is measured assuming the source currents given in Note 2.
Note 4:
The device draws current in excess of the specified supply current when the digital inputs are driven with voltages between
(V
CC
- 0.5V) and (GND + 0.5V). See Supply Current vs. Digital Input Voltage in the
Typical Operating Characteristics
section.
Note 5:
Guaranteed by design and characterization.
Typical Operating Characteristics
(V
DD
= +15V, V
SS
= -15V, V
CC
= +5V, V
H
= V
DD
, V
L
= V
SS
, T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. DIGITAL INPUT VOLTAGE
MAX5436 toc01
WIPER RESISTANCE vs. INPUT CODE
MAX5436 toc02
WIPER RESISTANCE vs. INPUT CODE
2800
2600
RESISTANCE (Ω)
2400
2200
2000
1800
1600
1400
1200
1000
V
DD
= +5V
V
SS
= -5V
CONDITIONS OF NOTE 2
MAX5436 toc03
2.0
1.8
1.6
SUPPLY CURRENT (mA)
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
1
2
3
4
5
DIGITAL INPUT VOLTAGE (V)
1100
1075
1050
RESISTANCE (Ω)
1025
1000
975
950
925
900
875
850
0
16
32
48
64
80
96
CONDITIONS OF NOTE 2
3000
112 128
0
16
32
48
64
80
96
112 128
INPUT CODE
INPUT CODE
4
_______________________________________________________________________________________
±15V, 128-Tap, Low-Drift Digital Potentiometers
Typical Operating Characteristics (continued)
(V
DD
= +15V, V
SS
= -15V, V
CC
= +5V, V
H
= V
DD
, V
L
= V
SS
, T
A
= +25°C, unless otherwise noted.)
END-TO-END RESISTANCE % CHANGE
vs. TEMPERATURE
MAX5436 toc04
MAX5436–MAX5439
W-TO-L RESISTANCE CHANGE
vs. INPUT CODE
MAX5436 toc05
DIGITAL SUPPLY CURRENT
vs. TEMPERATURE
MAX5436 toc06
0.15
END-TO-END RESISTANCE % CHANGE
0.10
0.05
100
90
80
RESISTANCE (kΩ)
70
60
50
40
30
20
10
0
50kΩ
100kΩ
40
DIGITAL SUPPLY CURRENT (μA)
35
30
25
20
15
10
0
-0.05
-0.10
-0.15
-0.20
-0.25
-40
50kΩ
100kΩ
-15
10
35
60
85
0
16
32
48
64
80
96
112 128
-40
-15
10
35
60
85
TEMPERATURE (°C)
INPUT CODE
TEMPERATURE (°C)
MIDSCALE SWITCHING TRANSIENT
(CODE 63 TO CODE 64)
MAX5436 toc07
VARIABLE-RESISTOR DNL
vs. INPUT CODE (50k
Ω
)
MAX5436 toc08
VARIABLE-RESISTOR DNL
vs. INPUT CODE (100k
Ω
)
0.08
0.06
0.04
DNL (LSB)
0.02
0
-0.02
-0.04
-0.06
-0.08
-0.10
CONDITIONS OF NOTE 2
MAX5436 toc09
0.10
0.08
0.06
CONDITIONS OF NOTE 2
0.10
DNL (LSB)
C
WIPER
= 20pF
100ns/div
CS
2V/div
0.04
0.02
0
-0.02
-0.04
-0.06
-0.08
-0.10
0
16
32
48
64
80
96
112 128
INPUT CODE
V
W-L
100mV/div
0
16
32
48
64
80
96
112 128
INPUT CODE
VARIABLE-RESISTOR INL
vs. INPUT CODE (50k
Ω
)
MAX5436 toc10
VARIABLE-RESISTOR INL
vs. INPUT CODE (100k
Ω
)
CONDITIONS OF NOTE 2
0.20
0.15
INL (LSB)
DNL (LSB)
0.10
0.05
0
-0.05
-0.10
-0.15
MAX5436 toc11
VOLTAGE-DIVIDER DNL
vs. INPUT CODE (50k
Ω
)
0.008
0.006
0.004
0.002
0
-0.002
-0.004
MAX5436 toc12
0.30
CONDITIONS OF NOTE 2
0.25
0.20
INL (LSB)
0.15
0.10
0.05
0
-0.05
-0.10
0
16
32
48
64
80
96
0.25
0.010
-0.006
-0.008
-0.010
0
16
32
48
64
80
96
112 128
0
16
32
48
64
80
96
112 128
INPUT CODE
INPUT CODE
112 128
INPUT CODE
_______________________________________________________________________________________
5
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