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19-1943; Rev 0; 1/01
Dual, 256-Tap, Low-Drift, Digital Potentiometers in 14-Pin TSSOP
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 0.1A supply current. These devices also provide glitchless switching between resistor taps, as well as a convenient poweron reset (POR) that sets the wiper to the midscale position 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 potentiometer or variable resistor. These parts are ideal for applications requiring digitally controlled resistors. Three resistance values are available: 10k (MAX5413), 50k (MAX5414), and 100k (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 14pin TSSOP package. Each device is guaranteed over the extended industrial temperature range (-40C to +85C). o 256 Tap Positions o Ultra-Low 0.1A Supply Current o +2.7V to +5.5V Single-Supply Operation o Two Independent Potentiometers in a Package o Low End-to-End Temperature Coefficient 35ppm/C o Low Ratiometric Temperature Coefficient 5ppm/C o Power-On Reset: Wiper Goes to Midscale (Position 128) o Glitchless Switching Between Resistor Taps o 3-Wire SPITM-Interface Compatible o 10k/50k/100k Resistor Values
Features
o 14-Pin TSSOP Small-Footprint Package
MAX5413/MAX5414/MAX5415
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
PART MAX5413EUD MAX5414EUD MAX5415EUD
Ordering Information
TEMP. RANGE -40C to +85C -40C to +85C -40C to +85C PIN-PACKAGE 14 TSSOP 14 TSSOP 14 TSSOP R (k) 10 50 100
Pin Configuration
TOP VIEW
GND 1 LB HB 2 3 14 LA 13 HA 12 WA
WB 4 N.C. 5 N.C. 6 CS 7
MAX5413 MAX5414 MAX5415
11 VDD 10 N.C. 9 8 SCLK DIN
SPI is a trademark of Motorola, Inc.
TSSOP
________________________________________________________________ Maxim Integrated Products
1
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Dual, 256-Tap, Low-Drift, Digital Potentiometers in 14-Pin TSSOP MAX5413/MAX5414/MAX5415
ABSOLUTE MAXIMUM RATINGS
VDD to GND ..............................................................-0.3V to +6V DIN, SCLK, CS .........................................................-0.3V to +6V HX, LX, WX to GND ........................................-0.3V to (VDD +0.3) Maximum Continuous Current into HX, LX, and WX............1mA Continuous Power Dissipation (TA = +70C) 14-Pin TSSOP (derate 9.1mW/C above +70C) .........727mW Operating Temperature Range ...........................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C
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 = +5V, unless otherwise noted. VH = VDD, VL = 0, TA = TMIN to TMAX. Typical values are at VDD = +5V, TA = +25C, unless otherwise noted.)
PARAMETER Resolution Integral Nonlinearity (Notes 1, 2) Differential Nonlinearity (Notes 1, 2) End-to-End Resistor Tempco Ratiometric Resistor Tempco MAX5413 Full-Scale Error MAX5414 MAX5415 MAX5413 Zero-Scale Error DC PERFORMANCE (Variable-Resistor Mode) Resolution N VDD = +5V Integral Nonlinearity (Notes 1, 3) INL VDD = +3V VDD = +5V VDD = +3V VDD = +5V VDD = +3V MAX5413 MAX5414/MAX5415 MAX5413 End-to-End Resistance RHL MAX5414 MAX5415 7.5 37.5 75 50 30 10 50 100 12.5 62.5 125 k 275 550 MAX5413 MAX5414 MAX5415 Differential Nonlinearity (Notes 1, 3) DNL 8 1 3 1.5 1.5 1/2 LSB LSB Bits LSB MAX5414 MAX5415 SYMBOL N INL DNL TCR 35 5 -8 -1.6 0.8 +8 +1.6 +0.8 LSB LSB CONDITIONS MIN 8 1/2 1/2 TYP MAX UNITS Bits LSB LSB ppm/C ppm/C DC PERFORMANCE (Voltage-Divider Mode)
DC PERFORMANCE (Resistor Characteristics) Wiper Resistance (Note 4) Wiper Capacitance RW CW pF
2
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Dual, 256-Tap, Low-Drift, Digital Potentiometers in 14-Pin TSSOP
ELECTRICAL CHARACTERISTICS (continued)
(VDD = +5V, unless otherwise noted. VH = VDD, VL = 0, TA = TMIN to TMAX. Typical values are at VDD = +5V, TA = +25C, unless otherwise noted.)
PARAMETER DIGITAL INPUTS Input High Voltage Input Low Voltage Input Leakage Current Input Capacitance TIMING CHARACTERISTICS (ANALOG) MAX5413 Wiper-Settling Time tS MAX5414 MAX5415 TIMING CHARACTERISTICS (DIGITAL) (Note 5) Maximum SCLK 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 Supply Voltage Supply Current VDD IDD CS = SCLK = DIN = VDD VDD = +5V VDD = +2.7V 2.7 0.8 0.1 5.5 5 V A A tCP tCH tCL tCSS tCSH tDS tDH tCS0 tCS1 tCSW 10 100 40 40 40 0 40 0 10 40 100 MHz ns ns ns ns ns ns ns ns ns ns 100 325 650 ns 5 VIH VIL 0.7 x VDD 0.3 x VDD 1.0 V V A pF SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX5413/MAX5414/MAX5415
Note 1: Linearity is defined in terms of the HX to LX code-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. HX is unconnected and LX = 0. At VDD = +5V, the wiper terminal is driven with a source current of 400A for the 10k configuration, 80A for the 50k configuration, and 40A for the 100k configuration. At VDD = +3V, 200A/40A/20A for 10k/50k/100k configurations, 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.
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Dual, 256-Tap, Low-Drift, Digital Potentiometers in 14-Pin TSSOP MAX5413/MAX5414/MAX5415
Typical Operating Characteristics
(VDD = +5.0V, TA = +25C, unless otherwise noted.)
WIPER RESISTANCE vs. WIPER VOLTAGE (10k)
MAX5413 toc01
WIPER RESISTANCE vs. WIPER VOLTAGE (50k)
MAX5413 toc02
WIPER RESISTANCE vs. WIPER VOLTAGE (100k)
MAX5413 toc03 MAX5413 toc09 MAX5413 toc06
300 280 WIPER RESISTANCE () 260 240 220 200 180 160 0 VDD = +5V VDD = +3V
380 360 340 WIPER RESISTANCE () 320 300 280 260 240 220 200 180 160 VDD = +5V VDD = +3V
400 380 WIPER RESISTANCE () 360 340 320 300 280 260 240 220 200 180 160 VDD = +5V VDD = +3V
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 WIPER VOLTAGE (V)
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 WIPER VOLTAGE (V)
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 WIPER VOLTAGE (V)
WIPER RESISTANCE vs. INPUT CODE (10k)
MAX5413 toc04
WIPER RESISTANCE vs. INPUT CODE (50k)
45 W-TO-L RESISTANCE (k) 40 35 30 25 20 15 10 5 0
MAX5413 toc05
WIPER RESISTANCE vs. INPUT CODE (100k)
100 90 W-TO-L RESISTANCE (k) 80 70 60 50 40 30 20 10 0
10 9 W-TO-L RESISTANCE (k) 8 7 6 5 4 3 2 1 0 0 32 64 96
50
128 160 192 224 256
0
32
64
96
128 160 192 224 256
0
32
64
96
128 160 192 224 256
INPUT CODE (DECIMAL)
INPUT CODE (DECIMAL)
INPUT CODE (DECIMAL)
VARIABLE RESISTOR DNL vs. INPUT CODE (10k)
MAX5413 toc07
VARIABLE RESISTOR INL vs. INPUT CODE (10k)
0.40 0.30 INL (LSB) DNL (LSB) 0.20 0.10 0.00 -0.10
MAX5413 toc08
VARIABLE RESISTOR DNL vs. INPUT CODE (50k)
0.06 0.05 0.04 0.03 0.02 0.01 0.00 -0.01 -0.02 -0.03 VDD = +5V
0.20
0.50
0.15
DNL (LSB)
0.10
0.05
0.00 -0.20 -0.05 0 32 64 96 128 160 192 224 256 INPUT CODE (DECIMAL) -0.30 0 32 64 96 128 160 192 224 256 INPUT CODE (DECIMAL)
0
32
64
96
128 160 192 224 256
INPUT CODE (DECIMAL)
4
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Dual, 256-Tap, Low-Drift, Digital Potentiometers in 14-Pin TSSOP
Typical Operating Characteristics (continued)
(VDD = +5.0V, TA = +25C, unless otherwise noted.)
VARIABLE RESISTOR INL vs. INPUT CODE (50k)
MAX5413 toc10
MAX5413/MAX5414/MAX5415
VARIABLE RESISTOR DNL vs. INPUT CODE (100k)
MAX5413 toc11
VARIABLE RESISTOR INL vs. INPUT CODE (100k)
0.10 0.05 INL (LSB) 0.00 -0.05 -0.10 -0.15 -0.20
MAX5413 toc12
0.04 0.02 0.00 -0.02 INL (LSB) -0.04 -0.06 -0.08 -0.10 -0.12 -0.14 -0.16 0 32 64 96
0.12 0.11 0.10 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0.00 -0.01 -0.02 0 32 64 96 128 160 192 224
0.15
128 160 192 224 256
DNL (LSB)
256
0
32
64
96
128
160 192 224
256
INPUT CODE (DECIMAL)
INPUT CODE (DECIMAL)
INPUT CODE (DECIMAL)
VOLTAGE-DIVIDER DNL vs. INPUT CODE (10k)
MAX5413 toc13
VOLTAGE-DIVIDER INL vs. INPUT CODE (10k)
MAX5413 toc14
VOLTAGE-DIVIDER DNL vs. INPUT CODE (50k)
0.07 0.06 0.05 DNL (LSB) 0.04 0.03 0.02 0.01 0.00 -0.01
MAX5413 toc15
0.08 0.07 0.06 0.05 DNL (LSB)
0.15 0.10 0.05 INL (LSB) 0.00 -0.05 -0.10 -0.15 -0.20
0.08
0.04 0.03 0.02 0.01 0.00 -0.01 -0.02 0 32 64 96 128 160 192 224 256 INPUT CODE (DECIMAL)
-0.02 0 32 64 96 128 160 192 224 256 0 32 64 96 128 160 192 224 256 INPUT CODE (DECIMAL) INPUT CODE (DECIMAL)
VOLTAGE-DIVIDER INL vs. INPUT CODE (50k)
MAX5413 toc16
VOLTAGE-DIVIDER DNL vs. INPUT CODE (100k)
MAX5413 toc17
VOLTAGE-DIVIDER INL vs. INPUT CODE (100k)
0.10 0.05 INL (LSB) 0.00 -0.05 -0.10 -0.15 -0.20
MAX5413 toc18
0.15 0.10 0.05
0.08 0.07 0.06 0.05 DNL (LSB) 0.04 0.03 0.02 0.01 0.00 -0.01
0.15
INL (LSB)
0.00 -0.05 -0.10 -0.15 -0.20 0 32 64 96 128 160 192 224 256 INPUT CODE (DECIMAL)
-0.02 0 32 64 96 128 160 192 224 256 INPUT CODE (DECIMAL)
0
32
64
96
128
160 192 224
256
INPUT CODE (DECIMAL)
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Dual, 256-Tap, Low-Drift, Digital Potentiometers in 14-Pin TSSOP MAX5413/MAX5414/MAX5415
Typical Operating Characteristics (continued)
(VDD = +5.0V, TA = +25C, unless otherwise noted.)
SUPPLY CURRENT vs. LOGIC INPUT VOLTAGE
MAX5413 toc19
SUPPLY CURRENT vs. TEMPERATURE
MAX5413 toc20
10
1.0 0.8 SUPPLY CURRENT (A) VDD = +5V
SUPPLY CURRENT (mA)
1 VDD = +5V
0.1
0.6
0.01
0.4 VDD = +3V
VDD = +3V
0.001 0.0001 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 INPUT LOGIC VOLTAGE (V)
0.2 0.0 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 TEMPERATURE (C)
END-TO-END RESISTANCE % CHANGE vs. TEMPERATURE
MAX5413 toc21
TAP-TO-TAP SWITCHING TRANSIENT (CODE 127 TO 128)
MAX5413 toc22
0.20 END-TO-END RESISTANCE % CHANGE 0.15 0.10 0.05 0 -0.05 -0.10 -0.15 -0.20 -0.25 -40 -20 0 20 40 60 80 TEMPERATURE (C) 10k 100k 50k 100k 10k 50k
VW-L 10mV/div
CS 5V/div 200ns/div
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Dual, 256-Tap, Low-Drift, Digital Potentiometers in 14-Pin TSSOP
Pin Description
PIN 1 2 3 4 5, 6, 10 7 8 9 11 12 13 14 NAME GND LB HB WB N.C. CS DIN SCLK VDD WA HA LA Ground Low Terminal of Resistor B High Terminal of Resistor B Wiper Terminal of Resistor B No Connection to this Terminal SPI Chip Select SPI Serial Data Input SPI Clock Input Power Supply, +2.7V to +5.5V. Connect a 0.1F capacitor to GND. Wiper Terminal of Resistor A High Terminal of Resistor A Low Terminal of Resistor A FUNCTION
MAX5413/MAX5414/MAX5415
POR VDD GND R DIN 9-BIT SHIFT REGISTER 8 R 8-BIT LATCH 8 DECODE 256
MAX5413 MAX5414 MAX5415
HA WA LA HB R 8-BIT LATCH 8 DECODE 256 WB LB
SCLK CS
SR DECODE
Figure 1. MAX5413/MAX5414/MAX5415 Functional Diagram: Dual 3-Terminal Potentiometers in 14-Pin TSSOP Configuration
Detailed Description
Each potentiometer consists of 255 fixed resistors in series between pins HX and LX (Figure 1). The potentiometer 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
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Dual, 256-Tap, Low-Drift, Digital Potentiometers in 14-Pin TSSOP MAX5413/MAX5414/MAX5415
POT REGISTER LOADED
CS
SCLK 1ST CLOCK PULSE DIN A0 D7 D6 D5 D4 D3 D2 9TH CLOCK PULSE D1 D0
MSB TIME
LSB
Figure 2. Potentiometer Serial Data Timing Circuit
CS *** tCSO SCLK tDS tDH DIN *** tCSS tCL tCH *** tCS1 tCP tCSH tCSW
Figure 3. Detailed Serial Interface Timing Diagram
have been shifted in, they are latched into the appropriate 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 circuitry that sets the wiper to the midscale position at powerup.
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 HX and WX of the MAX5413/MAX5414/MAX5415 are connected to the node between R3 and R2, and pin LX is 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.
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.
8
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Dual, 256-Tap, Low-Drift, Digital Potentiometers in 14-Pin TSSOP MAX5413/MAX5414/MAX5415
ADDRESS B0 (A0) (MSB) First Bit In B1 (D7) B2 (D6) B3 (D5) DATA WORD B4 (D4) B5 (D3) B6 (D2) B7 (D1) B8 (D0) (LSB) Last Bit In
Figure 4. Serial Data Format
R3 HX WX +5V LX MAX5413 MAX5414 MAX5415 R2 VIN VOUT VCC
V0 MAX4250
HX
WX
V0 / IS = R3 (1 + R2/R1) + R2 LX
MAX5413 MAX5414 MAX5415
Figure 5. I to V Converter
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 H X pin of the MAX5413/MAX5414/MAX5415 is connected to the OUT pin of the MAX6160, the LX pin 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.
Figure 6a. Adjustable Gain Circuit
VCC VIN VOUT
WX LX HX
MAX5413 MAX5414 MAX5415
Figure 6b. Adjustable Gain Circuit Using 3-Terminal Potentiometer
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Dual, 256-Tap, Low-Drift, Digital Potentiometers in 14-Pin TSSOP MAX5413/MAX5414/MAX5415
+5V VIN OUT
Chip Information
VOREF HX
TRANSISTOR COUNT: 8689 PROCESS: BiCMOS
ADJ GND
WX
MAX5413 MAX5414 MAX5415
LX
VOREF = 12.3kV / (100k C / 255) FOR MAX5413 VOREF = 61.5kV / (50k C / 255) FOR MAX5414 VOREF = 123kV / (100k C / 255) FOR MAX5415 WHERE C IS ANY CODE BEING WRITTEN TO A DEVICE.
Figure 7. Adjustable Voltage Reference
10
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Dual, 256-Tap, Low-Drift, Digital Potentiometers in 14-Pin TSSOP
Package Information
TSSOP,NO PADS.EPS
MAX5413-MAX5415
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 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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