General Description
The MAX5413/MAX5414/MAX5415 is a family of dual
linear taper digital potentiometers. Each device has two
3-terminal potentiometers. The MAX5413/MAX5414/
MAX5415 operate from +2.7V to +5.5V single-supply
voltages and use an ultra-low 0.1µA supply current.
These devices also provide glitchless switching
between resistor taps, as well as a convenient power-
on reset (POR) that sets the wiper to the midscale posi-
tion at power-up. Each potentiometer consists of a fixed
resistor with a wiper contact that is digitally controlled
through a 3-wire serial interface and has 256 tap points.
It performs the same function as a discrete potentiome-
ter or variable resistor.
These parts are ideal for applications requiring digitally
controlled resistors. Three resistance values are avail-
able: 10kΩ(MAX5413), 50kΩ(MAX5414), and 100kΩ
(MAX5415). A nominal resistor temperature coefficient
of 35ppm/°C end-to-end and 5ppm/°C ratiometric make
the MAX5413/MAX5414/MAX5415 ideal for applications
requiring low temperature-coefficient variable resistors,
such as adjustable-gain circuit configurations.
The MAX5413/MAX5414/MAX5415 are available in a 14-
pin TSSOP package. Each device is guaranteed over the
extended industrial temperature range (-40°C to +85°C).
Applications
Mechanical Potentiometer Replacement
Low-Drift Programmable Gain Amplifier (PGA)
Volume Control
LCD Screen Adjustment
Adjustable Voltage Reference
Programmable Filters, Delays, Time Constant
Impedance Matching
Features
♦14-Pin TSSOP Small-Footprint Package
♦256 Tap Positions
♦Ultra-Low 0.1µA Supply Current
♦+2.7V to +5.5V Single-Supply Operation
♦Two Independent Potentiometers in a Package
♦Low End-to-End Temperature Coefficient
35ppm/°C
♦Low Ratiometric Temperature Coefficient
5ppm/°C
♦Power-On Reset: Wiper Goes to Midscale
(Position 128)
♦Glitchless Switching Between Resistor Taps
♦3-Wire SPI™-Interface Compatible
♦10kΩ/50kΩ/100kΩResistor Values
MAX5413/MAX5414/MAX5415
Dual, 256-Tap, Low-Drift, Digital Potentiometers
in 14-Pin TSSOP
________________________________________________________________ Maxim Integrated Products 1
14
13
12
11
10
9
8
1
2
3
4
5
6
7
LA
HA
WA
VDD
WB
HB
LB
GND
TOP VIEW
MAX5413
MAX5414
MAX5415 N.C.
SCLK
DIN
N.C.
N.C.
TSSOP
CS
Pin Configuration
Ordering Information
19-1943; Rev 0; 1/01
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
PART TEMP. RANGE PIN-PACKAGE R (kΩ)
MAX5413EUD -40°C to +85°C 14 TSSOP 10
MAX5414EUD -40°C to +85°C 14 TSSOP 50
MAX5415EUD -40°C to +85°C 14 TSSOP 100
SPI is a trademark of Motorola, Inc.
MAX5413/MAX5414/MAX5415
Dual, 256-Tap, Low-Drift, Digital Potentiometers
in 14-Pin TSSOP
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VDD = +5V, unless otherwise noted. VH= VDD, VL= 0, TA= TMIN to TMAX. Typical values are at VDD = +5V, TA= +25°C,
unless otherwise noted.)
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.
VDD to GND..............................................................-0.3V to +6V
DIN, SCLK, CS .........................................................-0.3V to +6V
HX, LX, WXto GND ........................................-0.3V to (VDD +0.3)
Maximum Continuous Current into HX, LX, and WX............±1mA
Continuous Power Dissipation (TA= +70°C)
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
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DC PERFORMANCE (Voltage-Divider Mode)
Resolution N 8 Bits
Integral Nonlinearity (Notes 1, 2) INL ±1/2 LSB
D i ffer enti al N onl i near i ty ( N otes 1, 2) DNL ±1/2 LSB
End-to-End Resistor Tempco TCR35 ppm/°C
Ratiometric Resistor Tempco 5 ppm/°C
MAX5413 -8
MAX5414 -1.6
Full-Scale Error
MAX5415 0.8
LSB
MAX5413 +8
MAX5414 +1.6Zero-Scale Error
MAX5415 +0.8
LSB
DC PERFORMANCE (Variable-Resistor Mode)
Resolution N 8 Bits
VDD = +5V ±1 LSB
MAX5413 ±3
MAX5414 ±1.5
Integral Nonlinearity (Notes 1, 3) INL
VDD = +3V
MAX5415 ±1.5
LSB
VDD = +5V
Differential Nonlinearity
(Notes 1, 3) DNL VDD = +3V ±1/2 LSB
DC PERFORMANCE (Resistor Characteristics)
VDD = +5V 275
Wiper Resistance (Note 4) RWVDD = +3V 550 Ω
MAX5413 50
Wiper Capacitance CWMAX5414/MAX5415 30 pF
MAX5413 7.5 10 12.5
MAX5414 37.5 50 62.5End-to-End Resistance RHL
MAX5415 75 100 125
kΩ
MAX5413/MAX5414/MAX5415
Dual, 256-Tap, Low-Drift, Digital Potentiometers
in 14-Pin TSSOP
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(VDD = +5V, unless otherwise noted. VH= VDD, VL= 0, TA= TMIN to TMAX. Typical values are at VDD = +5V, TA= +25°C,
unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DIGITAL INPUTS
Input High Voltage VIH 0.7 x VDD V
Input Low Voltage VIL 0.3 x VDD V
Input Leakage Current ±1.0 µA
Input Capacitance 5pF
TIMING CHARACTERISTICS (ANALOG)
MAX5413 100
MAX5414 325Wiper-Settling Time tS
MAX5415 650
ns
TIMING CHARACTERISTICS (DIGITAL) (Note 5)
Maximum SCLK Frequency 10 MHz
SCLK Clock Period tCP 100 ns
SCLK Pulse Width High tCH 40 ns
SCLK Pulse Width Low tCL 40 ns
CS Fall to SCLK Rise Setup Time tCSS 40 ns
SCLK Rise to CS Rise Hold Time tCSH 0ns
DIN Setup Time tDS 40 ns
DIN Hold Time tDH 0ns
SCLK Rise to CS Fall Delay tCS0 10 ns
CS Rise to SCLK Rise Hold tCS1 40 ns
CS Pulse Width High tCSW 100 ns
POWER SUPPLIES
Supply Voltage VDD 2.7 5.5 V
VDD = +5V 0.8 5 µA
Supply Current IDD CS = SCLK = DIN = VDD VDD = +2.7V 0.1 µA
Note 1: Linearity is defined in terms of the HXto LXcode-dependent resistance.
Note 2: The DNL and INL are measured with the potentiometer configured as a voltage-divider with HX= VDD and LX= 0. The wiper
terminal is unloaded and measured with an ideal voltmeter.
Note 3: The DNL and INL are measured with the potentiometer configured as a variable resistor. HXis unconnected and LX= 0. At
VDD = +5V, the wiper terminal is driven with a source current of 400µA for the 10kΩconfiguration, 80µA for the 50kΩconfig-
uration, and 40µA for the 100kΩconfiguration. At VDD = +3V, 200µA/40µA/20µA for 10kΩ/50kΩ/100kΩconfigurations,
respectively.
Note 4: The wiper resistance is the worst value measured by injecting into WX, a current IW= VDD / RHL.
Note 5: Digital timing is guaranteed by design.
MAX5413/MAX5414/MAX5415
Dual, 256-Tap, Low-Drift, Digital Potentiometers
in 14-Pin TSSOP
4 _______________________________________________________________________________________
Typical Operating Characteristics
(VDD = +5.0V, TA = +25°C, unless otherwise noted.)
160
200
180
240
220
280
260
300
0 2.01.0 3.0 4.00.5 2.51.5 3.5 4.5 5.0
WIPER VOLTAGE (V)
WIPER RESISTANCE
vs. WIPER VOLTAGE (10kΩ)
MAX5413 toc01
WIPER RESISTANCE (Ω)
VDD = +3V
VDD = +5V
160
200
180
260
240
220
280
300
360
340
320
380
0 1.0 1.50.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
WIPER RESISTANCE
vs. WIPER VOLTAGE (50kΩ)
MAX5413 toc02
WIPER VOLTAGE (V)
WIPER RESISTANCE (Ω)
VDD = +3V
VDD = +5V
160
200
180
260
240
220
280
300
360
340
320
380
0 1.0 1.50.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
WIPER RESISTANCE
vs. WIPER VOLTAGE (100kΩ)
MAX5413 toc03
WIPER VOLTAGE (V)
WIPER RESISTANCE (Ω)
VDD = +3V
VDD = +5V
400
0
2
1
4
3
6
5
7
9
8
10
0649632 128 160 192 224 256
WIPER RESISTANCE
vs. INPUT CODE (10kΩ)
MAX5413 toc04
INPUT CODE (DECIMAL)
W-TO-L RESISTANCE (kΩ)
0
10
5
20
15
30
25
35
45
40
50
0649632 128 160 192 224 256
WIPER RESISTANCE
vs. INPUT CODE (50kΩ)
MAX5413 toc05
INPUT CODE (DECIMAL)
W-TO-L RESISTANCE (kΩ)
0
20
10
40
30
60
50
70
90
80
100
0649632 128 160 192 224 256
WIPER RESISTANCE
vs. INPUT CODE (100kΩ)
MAX5413 toc06
INPUT CODE (DECIMAL)
W-TO-L RESISTANCE (kΩ)
-0.05
0.00
0.10
0.05
0.15
0.20
0649632 128 160 192 224 256
VARIABLE RESISTOR DNL
vs. INPUT CODE (10kΩ)
MAX5413 toc07
INPUT CODE (DECIMAL)
DNL (LSB)
-0.30
-0.10
-0.20
0.10
0.00
0.20
0.30
0.40
0.50
0649632 128 160 192 224 256
VARIABLE RESISTOR INL
vs. INPUT CODE (10kΩ)
MAX5413 toc08
INPUT CODE (DECIMAL)
INL (LSB)
-0.03
-0.01
-0.02
0.02
0.01
0.00
0.05
0.04
0.03
0.06
0649632 128 160 192 224 256
VARIABLE RESISTOR DNL
vs. INPUT CODE (50kΩ)
MAX5413 toc09
INPUT CODE (DECIMAL)
DNL (LSB)
VDD = +5V
MAX5413/MAX5414/MAX5415
Dual, 256-Tap, Low-Drift, Digital Potentiometers
in 14-Pin TSSOP
_______________________________________________________________________________________ 5
-0.16
-0.12
-0.14
-0.08
-0.10
-0.04
-0.06
-0.02
0.02
0.00
0.04
128 160
0649632 192 224 256
VARIABLE RESISTOR INL
vs. INPUT CODE (50kΩ)
MAX5413 toc10
INPUT CODE (DECIMAL)
INL (LSB)
0.04
0.03
0.02
0.01
0.00
0.06
0.05
0.08
0.07
0.10
0.11
0.12
MAX5413 toc11
INPUT CODE (DECIMAL)
128 1600649632 192 224 256
VARIABLE RESISTOR DNL
vs. INPUT CODE (100kΩ)
DNL (LSB)
-0.01
-0.02
0.09
MAX5413 toc12
INPUT CODE (DECIMAL)
128 1600649632 192 224 256
VARIABLE RESISTOR INL
vs. INPUT CODE (100kΩ)
INL (LSB)
-0.20
-0.10
-0.15
0.00
-0.05
0.10
0.05
0.15
MAX5413 toc13
INPUT CODE (DECIMAL)
128 1600649632 192 224 256
VOLTAGE-DIVIDER DNL
vs. INPUT CODE (10kΩ)
DNL (LSB)
-0.02
0.01
0.00
-0.01
0.02
0.03
0.04
0.05
0.06
0.07
0.08
MAX5413 toc14
INPUT CODE (DECIMAL)
128 1600649632 192 224 256
VOLTAGE-DIVIDER INL
vs. INPUT CODE (10kΩ)
INL (LSB)
-0.20
-0.10
-0.15
0.00
-0.05
0.10
0.05
0.15
MAX5413 toc15
INPUT CODE (DECIMAL)
128 1600649632 192 224 256
VOLTAGE-DIVIDER DNL
vs. INPUT CODE (50kΩ)
DNL (LSB)
-0.02
0.01
0.00
-0.01
0.02
0.03
0.04
0.05
0.06
0.07
0.08
MAX5413 toc16
INPUT CODE (DECIMAL)
128 1600649632 192 224 256
VOLTAGE-DIVIDER INL
vs. INPUT CODE (50kΩ)
INL (LSB)
-0.20
-0.10
-0.15
0.00
-0.05
0.10
0.05
0.15
MAX5413 toc17
INPUT CODE (DECIMAL)
128 1600649632 192 224 256
VOLTAGE-DIVIDER DNL
vs. INPUT CODE (100kΩ)
DNL (LSB)
-0.02
0.01
0.00
-0.01
0.02
0.03
0.04
0.05
0.06
0.07
0.08
MAX5413 toc18
INPUT CODE (DECIMAL)
128 1600649632 192 224 256
VOLTAGE-DIVIDER INL
vs. INPUT CODE (100kΩ)
INL (LSB)
-0.20
-0.10
-0.15
0.00
-0.05
0.10
0.05
0.15
Typical Operating Characteristics (continued)
(VDD = +5.0V, TA = +25°C, unless otherwise noted.)
10
0.0001
01.00.5 2.0 3.5 5.04.5
SUPPLY CURRENT
vs. LOGIC INPUT VOLTAGE
0.001
0.01
0.1
1
MAX5413 toc19
INPUT LOGIC VOLTAGE (V)
SUPPLY CURRENT (mA)
1.5 2.5 4.03.0
VDD = +3V
VDD = +5V
0.0
0.2
0.6
0.4
0.8
1.0
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80
SUPPLY CURRENT vs. TEMPERATURE
MAX5413 toc20
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
VDD = +3V
VDD = +5V
-0.25
-0.15
-0.20
0
-0.05
-0.10
0.15
0.10
0.05
0.20
-40 0 20-20 40 60 80
END-TO-END RESISTANCE % CHANGE
vs. TEMPERATURE
MAX5413 toc21
TEMPERATURE (°C)
END-TO-END RESISTANCE % CHANGE
100kΩ
100kΩ
10kΩ
50kΩ
10kΩ
50kΩ
200ns/div
TAP-TO-TAP SWITCHING TRANSIENT
(CODE 127 TO 128)
VW-L
10mV/div
MAX5413 toc22
CS
5V/div
MAX5413/MAX5414/MAX5415
Dual, 256-Tap, Low-Drift, Digital Potentiometers
in 14-Pin TSSOP
6 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(VDD = +5.0V, TA = +25°C, unless otherwise noted.)
Detailed Description
Each potentiometer consists of 255 fixed resistors in
series between pins HXand LX(Figure 1). The poten-
tiometer wiper (pin WX) can be programmed to access
any one of the 256 different tap points on the resistor
string. The MAX5413/MAX5414/MAX5415 require nine
bits to program the wiper position. The first bit is an
address code, allowing one or the other potentiometer
to be selected for programming. The potentiometers
are programmed independently of each other.
The MAX5413/MAX5414/MAX5415 use a 3-wire serial
data interface to control the wiper tap position. This
write-only interface contains three inputs: Chip Select
(CS), Data In (DIN), and Data Clock (SCLK). When CS
is taken low, data from the DIN pin is synchronously
loaded into the serial shift register on each rising edge
of each SCLK pulse (Figure 2). After all the data bits
MAX5413/MAX5414/MAX5415
Dual, 256-Tap, Low-Drift, Digital Potentiometers
in 14-Pin TSSOP
_______________________________________________________________________________________ 7
Pin Description
PIN NAME FUNCTION
1 GND Ground
2L
BLow Terminal of Resistor B
3H
BHigh Terminal of Resistor B
4W
BWiper Terminal of Resistor B
5, 6, 10 N.C. No Connection to this Terminal
7CS SPI Chip Select
8 DIN SPI Serial Data Input
9 SCLK SPI Clock Input
11 VDD Power Supply, +2.7V to +5.5V. Connect a 0.1µF capacitor to GND.
12 WAWiper Terminal of Resistor A
13 HAHigh Terminal of Resistor A
14 LALow Terminal of Resistor A
VDD
GND
DIN
SCLK
9-BIT
SHIFT
REGISTER
R
8-BIT
LATCH
R
8-BIT
LATCH
R
SR
DECODE
CS
88
8
256
256
WA
LA
LB
HB
WB
POR
DECODE
DECODE
MAX5413
MAX5414
MAX5415
HA
Figure 1. MAX5413/MAX5414/MAX5415 Functional Diagram: Dual 3-Terminal Potentiometers in 14-Pin TSSOP Configuration
MAX5413/MAX5414/MAX5415
have been shifted in, they are latched into the appropri-
ate potentiometer control register when CS transitions
from low to high. Note that if CS is not kept low during
the entire data stream, the data will be corrupted and
the device will need to be reloaded.
The first bit A0 (address bit) is used to address one or
the other of the potentiometers for programming.
Potentiometer control register A is selected for writing
when A0 is ‘zero,’ and potentiometer control register B
is selected when A0 is ‘one.’
The MAX5413/MAX5414/MAX5415 feature POR circuit-
ry that sets the wiper to the midscale position at power-
up.
Applications Information
The MAX5413/MAX5414/MAX5415 are intended for a
variety of circuits where accurate, fine-tuning adjustable
resistance is required, such as in adjustable voltage or
adjustable gain circuit configurations. It is primarily used
in either a potentiometer divider or a variable-resistor
configuration.
Adjustable Current-to-Voltage Converter
Figure 5 shows the MAX5413/MAX5414/MAX5415 being
used with a MAX4250 low-noise op amp to fine tune a
current-to-voltage converter. Pins HXand WXof the
MAX5413/MAX5414/MAX5415 are connected to the
node between R3 and R2, and pin LXis connected to
ground. Circuit space is minimized due to both devices’
packaging.
Adjustable Gain Amplifier
Figure 6 shows how to use the MAX5413/MAX5414/
MAX5415 to digitally adjust the gain of a noninverting op
amp configuration. In Figure 6a, connect the MAX5413/
MAX5414/MAX5415 as a variable resistor in series with a
resistor to ground to form the adjustable gain control of a
noninverting amplifier.
Similarly, Figure 6b shows how to use the MAX5413/
MAX5414/MAX5415 as a 3-terminal potentiometer. In
this application, the MAX5413/MAX5414/MAX5415 low
5ppm/°C ratiometric tempco allows for a very stable
adjustable gain configuration over temperature.
Dual, 256-Tap, Low-Drift, Digital Potentiometers
in 14-Pin TSSOP
8 _______________________________________________________________________________________
SCLK
POT REGISTER LOADED
9TH CLOCK PULSE1ST CLOCK PULSE
DIN
TIME
A0 D7 D6 D5 D4 D3 D2 D1 D0
CS
MSB LSB
Figure 2. Potentiometer Serial Data Timing Circuit
• • •
• • •
• • •
CS
SCLK
DIN
tCSO tCSS tCL
tDS
tDH
tCH tCSH
tCSW
tCP
tCS1
Figure 3. Detailed Serial Interface Timing Diagram
Adjustable Voltage Reference
In Figure 7, the MAX5413/MAX5414/MAX5415
are shown with the MAX6160 to make an adjustable
voltage reference. In this circuit, the HXpin of the
MAX5413/MAX5414/MAX5415 is connected to the
OUT pin of the MAX6160, the LXpin of the MAX5413/
MAX5414/MAX5415 is connected to GND, and the WX
pin of the MAX5413/MAX5414/MAX5415 is connected
to the ADJ pin of the MAX6160. The MAX5413/
MAX5414/MAX5415 allow precise setting of the voltage
reference output. A low 5ppm/°C ratiometric tempco
allows a very stable adjustable voltage overtemperature.
MAX5413/MAX5414/MAX5415
Dual, 256-Tap, Low-Drift, Digital Potentiometers
in 14-Pin TSSOP
_______________________________________________________________________________________ 9
ADDRESS DATA WORD
B0 (A0) B1 (D7) B2 (D6) B3 (D5) B4 (D4) B5 (D3) B6 (D2) B7 (D1) B8 (D0)
(MSB) (LSB)
First Bit In Last Bit In
Figure 4. Serial Data Format
Figure 5. I to V Converter
V0 / IS = R3 (1 + R2/R1) + R2
+5V
R3
R2
V0
MAX4250
HX
LX
WX
MAX5413
MAX5414
MAX5415
Figure 6a. Adjustable Gain Circuit
VCC
VIN
VOUT
MAX5413
MAX5414
MAX5415
HX
WX
LX
Figure 6b. Adjustable Gain Circuit Using 3-Terminal
Potentiometer
VCC
VIN
VOUT
MAX5413
MAX5414
MAX5415
HX
LX
WX
Chip Information
TRANSISTOR COUNT: 8689
PROCESS: BiCMOS
MAX5413/MAX5414/MAX5415
Dual, 256-Tap, Low-Drift, Digital Potentiometers
in 14-Pin TSSOP
10 ______________________________________________________________________________________
Figure 7. Adjustable Voltage Reference
VOREF = 12.3kV ✕ Ω / (100kΩ ✕ C / 255) FOR MAX5413
VOREF = 61.5kV ✕ Ω / (50kΩ ✕ C / 255) FOR MAX5414
VOREF = 123kV ✕ Ω / (100kΩ ✕ C / 255) FOR MAX5415
WHERE C IS ANY CODE BEING WRITTEN TO A DEVICE.
MAX5413
MAX5414
MAX5415
OUT
ADJ
GND
VIN
+5V
VOREF
WX
LX
HX
MAX5413–MAX5415
Dual, 256-Tap, Low-Drift, Digital Potentiometers
in 14-Pin TSSOP
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11
© 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
Package Information
TSSOP,NO PADS.EPS
