19-5140; Rev 2; 11/10
TION KIT
EVALUA BLE
AVAILA
Dual, 256-Tap, Volatile, Low-Voltage
Linear Taper Digital Potentiometer
Features
S
Dual, 256-Tap Linear Taper Positions
S
Single +2.6V to +5.5V Supply Operation
S
Low < 1µA Quiescent Supply Current
S
10kI, 50kI, 100kI End-to-End Resistance Values
S
I
2
C-Compatible Interface
S
Power-On Sets Wiper to Midscale
S
-40NC to + 125NC Operating Temperature Range
General Description
The MAX5387 dual, 256-tap, volatile, low-voltage lin-
ear taper digital potentiometer offers three end-to-end
resistance values of 10kI, 50kI, and 100kI. Operating
from a single +2.6V to +5.5V power supply, the device
provides a low 35ppm/NC end-to-end temperature coef-
ficient. The device features an I
2
C interface.
The small package size, low supply operating voltage,
low supply current, and automotive temperature range
of the MAX5387 make the device uniquely suitable for
the portable consumer market, battery backup industrial
applications, and the automotive market.
The MAX5387 is specified over the automotive -40NC to
+125NC temperature range and is available in a 14-pin
TSSOP package.
MAX5387
Applications
Low-Voltage Battery Applications
Portable Electronics
Mechanical Potentiometer Replacement
Offset and Gain Control
Adjustable Voltage References/Linear Regulators
Automotive Electronics
PART
MAX5387LAUD+
MAX5387MAUD+
MAX5387NAUD+
Ordering Information
PIN-PACKAGE
14 TSSOP
14 TSSOP
14 TSSOP
END-TO-END
RESISTANCE (kI)
10
50
100
Note:
All devices are specified over the -40NC to +125NC oper-
ating temperature range.
+Denotes
a lead(Pb)-free/RoHS-compliant package.
Functional Diagram
V
DD
HA
WA
LA
SCL
SDA
A0
A1
A2
I
2
C
LATCH
POR
LATCH
256 DECODER
HB
MAX5387
256 DECODER
WB
LB
GND
_______________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Dual, 256-Tap, Volatile, Low-Voltage
Linear Taper Digital Potentiometer
MAX5387
ABSOLUTE MAXIMUM RATINGS
V
DD
to GND ...........................................................-0.3V to +6V
H_, W_, L_ to GND ......................................-0.3V to the lower of
(V
DD
+ 0.3V) and +6V
All Other Pins to GND .............................................-0.3V to +6V
Continuous Current into H_, W_, and L_
MAX5387L .....................................................................
Q5mA
MAX5387M ....................................................................
Q2mA
MAX5387N.....................................................................
Q1mA
Continuous Power Dissipation (T
A
= +70NC)
14-Pin TSSOP (derate 10mW/NC above +70NC) ......796.8mW
Operating Temperature Range ....................... -40NC to +125NC
Junction Temperature ....................................................+150NC
Storage Temperature Range............................ -65NC to +150NC
Lead Temperature (soldering, 10s) ................................+300NC
Soldering Temperature (reflow) ......................................+260NC
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
= +2.6V to +5.5V, V
H_
= V
DD
, V
L_
= GND, T
A
= -40NC to +125NC, unless otherwise noted. Typical values are at V
DD
= +5V,
T
A
= +25NC.) (Note 1)
PARAMETER
Resolution
Integral Nonlinearity
Differential Nonlinearity
Dual Code Matching
Ratiometric Resistor Tempco
Full-Scale Error
SYMBOL
N
INL
DNL
(Note 2)
(Note 2)
Register A = register B
(DV
W
/V
W
)/DT; no load
MAX5387L
Code = FFH
MAX5387M
MAX5387N
MAX5387L
Zero-Scale Error
DC PERFORMANCE (Variable-Resistor Mode)
MAX5387L
V
DD
> +2.6V
Integral Nonlinearity
R-INL
V
DD
> +4.75V
Differential Nonlinearity
R-DNL
MAX5387M
MAX5387N
MAX5387L
MAX5387M
MAX5387N
V
DD
> 2.6V (Note 3)
V
DD
> 2.6V
V
DD
> 4.75V
Measured to GND
Measured to GND
No load
Wiper not connected
-25
-0.5
250
150
10
50
35
+25
DC PERFORMANCE (Resistor Characteristics)
Wiper Resistance (Note 4)
Terminal Capacitance
Wiper Capacitance
End-to-End Resistor Tempco
End-to-End Resistor Tolerance
R
WL
C
H
_, C
L
_
C
W
_
TC
R
DR
HL
600
200
I
pF
pF
ppm/NC
%
±1.0
±0.5
±0.25
±0.4
±0.3
±0.25
±2.5
±1.0
±0.8
±1.5
±0.75
±0.5
+0.5
LSB
LSB
Code = 00H
MAX5387M
MAX5387N
-3
-1
-0.5
CONDITIONS
MIN
256
-0.5
-0.5
-0.5
+5
-2.5
-0.5
-0.25
+2.5
+0.5
+0.25
+3
+1.0
+0.5
LSB
LSB
+0.5
+0.5
+0.5
TYP
MAX
UNITS
Tap
LSB
LSB
LSB
LSB
DC PERFORMANCE (Voltage-Divider Mode)
2
______________________________________________________________________________________
Dual, 256-Tap, Volatile, Low-Voltage
Linear Taper Digital Potentiometer
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +2.6V to +5.5V, V
H_
= V
DD
, V
L_
= GND, T
A
= -40NC to +125NC, unless otherwise noted. Typical values are at V
DD
= +5V,
T
A
= +25NC.) (Note 1)
PARAMETER
AC PERFORMANCE
Crosstalk
-3dB Bandwidth
Total Harmonic Distortion Plus
Noise
Wiper Settling Time (Note 6)
POWER SUPPLIES
Supply-Voltage Range
Standby Current
DIGITAL INPUTS
Minimum Input High Voltage
Maximum Input Low Voltage
Input Leakage Current
Input Capacitance
TIMING CHARACTERISTICS (Notes 7, 8)
Maximum SCL Frequency
Setup Time for START Condition
Hold Time for START Condition
SCL High Time
SCL Low Time
Data Setup Time
Data Hold Time
SDA, SCL Rise Time
SDA, SCL Fall
Setup Time for STOP Condition
Bus Free Time Between STOP and
START Conditions
Pulse-Suppressed Spike Width
Capacitive Load for Each Bus
f
SCL
t
SU:STA
t
HD:STA
t
HIGH
t
LOW
t
SU:DAT
t
HD:DAT
t
R
t
F
t
SU:STO
t
BUF
t
SP
C
B
Minimum power-up rate = 0.2V/Fs
0.6
1.3
50
400
0.6
0.6
0.6
1.3
100
0
0.3
0.3
400
kHz
Fs
Fs
Fs
Fs
ns
Fs
Fs
Fs
Fs
Fs
ns
pF
V
IH
V
IL
-1
5
70
30
+1
% x V
DD
% x V
DD
FA
pF
V
DD
Digital inputs = V
DD
or GND
2.6
1
5.5
V
FA
BW
(Note 5)
Code = 80H,
10pF load,
V
DD
= +2.6V
MAX5387L
MAX5387M
MAX5387N
-90
600
150
75
0.015
300
1000
2000
%
ns
kHz
dB
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX5387
THD+N
t
S
Measured at W; V
H
_ = 1V
RMS
at 1kHz
MAX5387L
MAX5387M
MAX5387N
Note 1:
All devices are 100% production tested at T
A
= +25NC. Specifications overtemperature limits are guaranteed by design
and characterization.
Note 2:
DNL and INL are measured with the potentiometer configured as a voltage-divider (Figure 1) with H_ = V
DD
and L_ = 0V.
The wiper terminal is unloaded and measured with an ideal voltmeter.
Note 3:
R-DNL and R-INL are measured with the potentiometer configured as a variable resistor (Figure 1). DNL and INL are
measured with the potentiometer configured as a variable resistor. H_ is unconnected and L_ = GND. For V
DD
= +5V, the
wiper terminal is driven with a source current of 400FA for the 10kI configuration, 80FA for the 50kI configuration, and
40FA for the 100kI configuration. For V
DD
= +2.6V, the wiper terminal is driven with a source current of 200FA for the
10kI configuration, 40FA for the 50kI configuration, and 20FA for the 100kI configuration.
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
.
_______________________________________________________________________________________
3
Dual, 256-Tap, Volatile, Low-Voltage
Linear Taper Digital Potentiometer
MAX5387
Note 5:
Drive HA with a 1kHz GND to V
DD
amplitude tone. LA = LB = GND. No load. WB is at midscale with a 10pF load.
Measure WB.
Note 6:
The wiper settling time is the worst-case 0 to 50% rise time, measured between tap 0 and tap 127. H_ = V
DD
, L_ = GND,
and the wiper terminal is loaded with 10pF capacitance to ground.
Note 7:
Digital timing is guaranteed by design and characterization, not production tested.
Note 8:
The SCL clock period includes rise and fall times (t
R
= t
F
). All digital input signals are specified with t
R
= t
F
= 2ns and
timed from a voltage level of (V
IL
+ V
IH
)/2.
H
N.C.
W
W
L
L
Figure 1. Voltage-Divider and Variable Resistor Configurations
Typical Operating Characteristics
(V
DD
= 5V, T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. TEMPERATURE
MAX5387 toc01
SUPPLY CURRENT
vs. DIGITAL INPUT VOLTAGE
MAX5387 toc02
0.9
0.8
SUPPLY CURRENT (µA)
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
V
DD
= 2.6V
V
DD
= 5V
0.9
0.8
0.7
I
DD
(µA)
0.6
0.5
0.4
0.3
0.2
0.1
0
1000
SUPPLY CURRENT (µA)
100
10
1
0.1
0
V
DD
= 2.6V
V
DD
= 5V
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
DIGITAL INPUT VOLTAGE (V)
2.6
3.1
3.6
4.1
V
DD
(V)
4.6
5.1
RESISTANCE (W-TO-L)
vs. TAP POSITION (10k
I
)
MAX5387 toc04
RESISTANCE (W-TO-L)
vs. TAP POSITION (50k
I
)
MAX5387 toc05
RESISTANCE (W-TO-L)
vs. TAP POSITION (100kI)
100
RESISTANCE (W-TO-L) (kI)
90
80
70
60
50
40
30
20
10
0
0
51
102
153
204
255
TAP POSITION
MAX5387 toc06
11
10
W-TO-L RESISTANCE (kΩ)
9
8
7
6
5
4
3
2
1
0
0
51
102
153
TAP POSITION
204
55
50
W-TO-L RESISTANCE (kΩ)
45
40
35
30
25
20
15
10
5
0
110
255
0
51
102
153
TAP POSITION
204
255
4
______________________________________________________________________________________
MAX5387 toc03
1.0
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
1.0
10,000
Dual, 256-Tap, Volatile, Low-Voltage
Linear Taper Digital Potentiometer
Typical Operating Characteristics (continued)
(V
DD
= 5V, T
A
= +25°C, unless otherwise noted.)
WIPER RESISTANCE
vs. WIPER VOLTAGE (10k
I
)
MAX5387 toc07
MAX5387
END-TO-END RESISTANCE % CHANGE
vs. TEMPERATURE
10kI
MAX5387 toc08
VARIABLE-RESISTOR DNL
vs. TAP POSITION (10kI)
0.08
0.06
0.04
0.02
0
-0.02
-0.04
-0.06
-0.08
-0.10
I
WIPER
= 400µA
190
WIPER RESISTANCE (Ω)
170
150
130
110
90
70
V
DD
= 5V
V
DD
= 2.6V
END-TO-END RESISTANCE % CHANGE
0
-0.1
50kI
-0.2
-0.3
-0.4
-0.5
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (NC)
100kI
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
WIPER VOLTAGE (V)
DNL (LSB)
0
51
102
153
204
255
TAP POSITION
VARIABLE-RESISTOR DNL
vs. TAP POSITION (50kI)
MAX5387 toc10
VARIABLE-RESISTOR DNL
vs. TAP POSITION (100kI)
MAX5387 toc11
VARIABLE-RESISTOR INL
vs. TAP POSITION (10kI)
0.8
0.6
0.4
INL (LSB)
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
0.08
0.06
0.04
DNL (LSB)
0
-0.02
-0.04
-0.06
-0.08
-0.10
0
0.02
I
WIPER
= 80µA
0.08
0.06
0.04
DNL (LSB)
0.02
0
-0.02
-0.04
-0.06
-0.08
-0.10
I
WIPER
= 400µA
I
WIPER
= 400µA
51
102
153
204
255
0
51
102
153
204
255
0
51
102
153
204
255
TAP POSITION
TAP POSITION
TAP POSITION
VARIABLE-RESISTOR INL
vs. TAP POSITION (50kI)
MAX5387 toc13
VARIABLE-RESISTOR INL
vs. TAP POSITION (100kI)
MAX5387 toc14
VOLTAGE-DIVIDER DNL
vs. TAP POSITION (10kI)
0.08
0.06
0.04
DNL (LSB)
0.02
0
-0.02
-0.04
-0.06
-0.08
-0.10
MAX5386 toc15
0.5
0.4
0.3
0.2
INL (LSB)
0
-0.1
-0.2
-0.3
-0.4
-0.5
0
0.1
I
WIPER
= 80µA
0.5
0.4
0.3
0.2
INL (LSB)
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
I
WIPER
= 400µA
0.10
51
102
153
204
255
0
51
102
153
204
255
0
51
102
153
204
255
TAP POSITION
TAP POSITION
TAP POSITION
_______________________________________________________________________________________
5
MAX5387 toc12
0.10
0.10
1.0
MAX5387 toc09
210
0.1
0.10
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