19-5035; Rev 1; 4/10
TION KIT
EVALUA BLE
AVAILA
Dual 256-Tap, Volatile, Low-Voltage
Linear Taper Digital Potentiometers
Features
S
Dual 256-Tap Linear Taper Positions
S
Single +1.7V to +5.5V Supply Operation
S
Low 12µA Quiescent Supply Current
S
10kI, 50kI, and 100kI End-to-End Resistance
General Description
The MAX5391/MAX5393 dual 256-tap, volatile, low-
voltage linear taper digital potentiometers offer three
end-to-end resistance values of 10kI, 50kI, and 100kI.
Operating from a single +1.7V to +5.5V power sup-
ply, these devices provide a low 35ppm/NC end-to-end
temperature coefficient. The devices feature an SPIK
interface.
The small package size, low supply voltage, low sup-
ply current, and automotive temperature range of the
MAX5391/MAX5393 make the devices uniquely suitable
for the portable consumer market, battery backup indus-
trial applications, and the automotive market.
The MAX5391/MAX5393 include two digital potentio-
meters in a voltage-divider configuration. The MAX5391/
MAX5393 are specified over the -40NC to +125NC auto-
motive temperature range and are available in a 16-pin,
3mm x 3mm TQFN and a 14-pin TSSOP package,
respectively.
MAX5391/MAX5393
Values
S
SPI-Compatible Interface
S
Wiper Set to Midscale on Power-Up
S
-40NC to +125NC Operating Temperature Range
Ordering Information
PART
MAX5391LATE+
MAX5391MATE+
MAX5391NATE+
MAX5393LAUD+
MAX5393MAUD+
MAX5393NAUD+
PIN-PACKAGE
16 TQFN-EP*
16 TQFN-EP*
16 TQFN-EP*
14 TSSOP
14 TSSOP
14 TSSOP
END-TO-END
RESISTANCE (kI)
10
50
100
10
50
100
Applications
Low-Voltage Battery Applications
Portable Electronics
Mechanical Potentiometer Replacement
Offset and Gain Control
Adjustable Voltage References/Linear Regulators
Automotive Electronics
Note:
All devices are specified in the -40NC to +125NC tem-
perature range.
+Denotes
a lead(Pb)-free/RoHS-compliant package.
*EP
= Exposed pad.
Functional Diagram
V
DD
CHARGE
PUMP
CS
SCLK
DIN
BYP
HA
WA
LA
LATCH
SPI
POR
LATCH
256 DECODER
HB
MAX5391
MAX5393
256 DECODER
WB
LB
GND
SPI is a trademark of Motorola, Inc.
_______________________________________________________________
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 Potentiometers
MAX5391/MAX5393
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) or +6V
All Other Pins to GND .............................................-0.3V to +6V
Continuous Current into H_, W_, and L_
MAX5391L/MAX5393L...................................................
Q5mA
MAX5391M/MAX5393M.................................................
Q2mA
MAX5391N/MAX5393N .................................................
Q1mA
Continuous Power Dissipation (T
A
= +70NC)
14-Pin TSSOP (derate 10mW/NC above +70NC) ......796.8mW
16-Pin TQFN (derate 14.7mW/NC above +70NC) ...1176.5mW
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
= +1.7V to +5.5V, V
H_
= V
DD
, V
L_
= GND, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
DD
= +1.8V,
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
MAX5391L/MAX5393L
Code = FFh
MAX5391M/MAX5393M
MAX5391N/MAX5393N
MAX5391L/MAX5393L
Zero-Scale Error
DC PERFORMANCE (Variable Resistor Mode)
MAX5391L/MAX5393L
Integral Nonlinearity (Note 3)
Differential Nonlinearity
Wiper Resistance
Terminal Capacitance
Wiper Capacitance
End-to-End Resistor Tempco
End-to-End Resistor Tolerance
AC PERFORMANCE
Crosstalk
-3dB Bandwidth
Total Harmonic Distortion Plus Noise
BW
THD+N
(Note 5)
Code = 80H,
10pF load,
V
DD
= 1.8V
MAX5391L/MAX5393L
MAX5391M/MAX5393M
MAX5391N/MAX5393N
-90
600
100
50
0.02
%
kHz
dB
R-INL
R-DNL
R
WL
C
W
_
TC
R
DR
HL
MAX5391M/MAX5393M
MAX5391N/MAX5393N
(Note 3)
(Note 4)
10
50
35
-25
+25
Measured to GND
No load
Wiper not connected
DC PERFORMANCE (Resistor Characteristics)
200
I
pF
pF
ppm/NC
%
C
H
_, C
L
_ Measured to GND
-1.5
-0.75
-0.5
-0.5
+1.5
+0.75
+0.5
+0.5
LSB
LSB
Code = 00h
MAX5391M/MAX5393M
MAX5391N/MAX5393N
-3
-1
-0.5
CONDITIONS
MIN
256
-0.5
-0.5
-0.5
5
-2.2
-0.6
-0.3
2.2
0.6
0.3
3
1
0.5
LSB
LSB
+0.5
+0.5
+0.5
TYP
MAX
UNITS
Tap
LSB
LSB
LSB
ppm/NC
DC PERFORMANCE (Voltage-Divider Mode)
Measured at W, V
H_
= 1V
RMS
at 1kHz
2
______________________________________________________________________________________
Dual 256-Tap, Volatile, Low-Voltage
Linear Taper Digital Potentiometers
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +1.7V to +5.5V, V
H_
= V
DD
, V
L_
= GND, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
DD
= +1.8V,
T
A
= +25NC.) (Note 1)
PARAMETER
Wiper Settling Time (Note 6)
Charge-Pump Feedthrough at W_
POWER SUPPLIES
Supply Voltage Range
Standby Current
DIGITAL INPUTS
Minimum Input High Voltage
Maximum Input Low Voltage
Input Leakage Current
Input Capacitance
TIMING CHARACTERISTICS—SPI (Note 7)
SCLK Frequency
SCLK Clock Period
SCLK Pulse-Width High
SCLK Pulse-Width Low
CS
Fall to SCK Rise Setup Time
SCLK Rise to
CS
Rise Hold Time
DIN Setup Time
DIN Hold Time
SCLK Rise to
CS
Fall Delay
SCLK Rise to SCLK Rise Hold Time
CS
Pulse-Width High
f
MAX
t
CP
t
CH
t
CL
t
CSS
t
CSH
t
DS
t
DH
t
CS0
t
CS1
t
CSW
100
40
40
40
0
40
0
10
40
100
10
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
V
IH
V
IL
V
DD
= 2.6V to 5.5V
V
DD
= 1.7V to 2.6V
V
DD
= 2.6V to 5.5V
V
DD
= 1.7V to 2.6V
-1
5
70
75
30
25
+1
% x V
DD
% x V
DD
FA
pF
V
DD
V
DD
= 5.5V
V
DD
= 1.7V
1.7
27
12
5.5
V
FA
SYMBOL
t
S
V
RW
CONDITIONS
MAX5391L/MAX5393L
MAX5391M/MAX5393M
MAX5391N/MAX5393N
f
CLK
= 600kHz, C
OUT
= 0nF
MIN
TYP
400
1200
2200
200
nV
P-P
ns
MAX
UNITS
MAX5391/MAX5393
Note 1:
All devices are 100% production tested at T
A
= +25NC. Specifications over temperature 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_ =
GND. The wiper terminal is unloaded and measured with a high-input-impedance 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
= +1.7V, the wiper terminal is driven with a source current of 150FA for the
10kI configuration, 30FA for the 50kI configuration, and 15FA for the 100kI configuration.
Note 4:
The wiper resistance is the 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:
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.
_______________________________________________________________________________________
3
Dual 256-Tap, Volatile, Low-Voltage
Linear Taper Digital Potentiometers
MAX5391/MAX5393
H
N.C.
W
W
L
L
Figure 1. Voltage-Divider and Variable Resistor Configurations
Typical Operating Characteristics
(V
DD
= 1.8V, T
A
= +25NC, unless otherwise noted.)
SUPPLY CURRENT
vs. TEMPERATURE
MAX5391 toc01
SUPPLY CURRENT
vs. DIGITAL INPUT VOLTAGE
MAX5391 toc02
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
30
MAX5391 toc03
30
25
SUPPLY CURRENT (µA)
20
15
10
5
0
V
DD
= 5V
10,000
V
DD
= 5V
SUPPLY CURRENT (µA)
1000
25
I
DD
(µA)
V
DD
= 2.6V
V
DD
= 2.6V
100
20
V
DD
= 1.8V
10
V
DD
= 1.8V
1
15
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
DIGITAL INPUT VOLTAGE (V)
10
1.7
2.2
2.7
3.2
3.7
4.2
4.7
5.2
V
DD
(V)
RESISTANCE (W_-TO-L_)
vs. TAP POSITION (10kI)
MAX5391 toc04
RESISTANCE (W_-TO-L_)
vs. TAP POSITION (50kI)
MAX5391 toc05
RESISTANCE (W_-TO-L_)
vs. TAP POSITION (100kI)
90
W-TO-L RESISTANCE (kI)
MAX5391 toc06
10
9
W-TO-L RESISTANCE (kI)
8
7
6
5
4
3
2
1
0
0
51
102
153
204
50
45
W-TO-L RESISTANCE (kI)
40
35
30
25
20
15
10
5
0
100
80
70
60
50
40
30
20
10
0
255
0
51
102
153
204
255
0
51
102
153
204
255
TAP POSITION
TAP POSITION
TAP POSITION
4
______________________________________________________________________________________
Dual 256-Tap, Volatile, Low-Voltage
Linear Taper Digital Potentiometers
Typical Operating Characteristics (continued)
(V
DD
= 1.8V, T
A
= +25NC, unless otherwise noted.)
MAX5391/MAX5393
WIPER RESISTANCE
vs. WIPER VOLTAGE
MAX5391 toc07
END-TO-END RESISTANCE PERCENTAGE
CHANGE vs. TEMPERATURE
MAX5391 toc08
VARIABLE RESISTOR 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
I
WIPER
= 150µA
0
51
102
153
204
255
MAX5391 toc09
0.05
END-TO-END RESISTANCE % CHANGE
0.04
0.03
0.02
0.01
0
-0.01
-0.02
-0.03
50kI
10kI
100kI
0.10
140
WIPER RESISTANCE (I)
120
100
V
DD
= 5V
80
V
DD
= 1.8V
V
DD
= 2.6V
60
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
WIPER VOLTAGE (V)
TAP POSITION
VARIABLE RESISTOR DNL
vs. TAP POSITION (50kI)
MAX5391 toc10
VARIABLE RESISTOR DNL
vs. TAP POSITION (100kI)
MAX5391 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
MAX5391 toc12
0.10
0.08
0.06
0.04
DNL (LSB)
0.10
0.08
0.06
0.04
DNL (LSB)
0.02
0
-0.02
-0.04
-0.06
-0.08
-0.10
1.0
0.02
0
-0.02
-0.04
-0.06
-0.08
-0.10
0
51
102
153
204
255
TAP POSITION
I
WIPER
= 30µA
I
WIPER
= 15µA
0
51
102
153
204
255
I
WIPER
= 150µA
0
51
102
153
204
255
TAP POSITION
TAP POSITION
VARIABLE RESISTOR INL
vs. TAP POSITION (50kI)
MAX5391 toc13
VARIABLE RESISTOR INL
vs. TAP POSITION (100kI)
MAX5391 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
MAX5391 toc15
0.5
0.4
0.3
0.2
INL (LSB)
0
-0.1
-0.2
-0.3
-0.4
-0.5
0
51
102
153
204
I
WIPER
= 30µA
0.1
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
= 15µA
0
51
102
153
204
0.10
255
255
0
51
102
153
204
255
TAP POSITION
TAP POSITION
TAP POSITION
_______________________________________________________________________________________
5
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