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19-2657; Rev 0; 10/02
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 (VCC). The resistor string uses its own analog supplies (V DD and V SS ) that require VDD - VSS 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 VDD - VSS and VCC VSS are met. The MAX5437/MAX5439 include an on-chip, highvoltage, uncommitted amplifier, providing additional reductions in board space and cost. Other features include low 35ppm/C end-to-end and 5ppm/C ratiometric resistor temperature coefficients, a 3-wire SPITM/ QSPITM/MICROWIRETM-compatible serial interface, and a power-on reset to midscale. The MAX5436/MAX5438 are available in 10-pin MAX packages. The MAX5437/MAX5439 are available in 14pin TSSOP package. Each device is guaranteed over the extended temperature range of -40C to +85C.
Features
o +10V to +30V Single-Supply Operation o -28V to -10V Single Negative Supply Operation o 5V to 15V Dual-Supply Operation o 128 Tap Positions o Uncommitted High-Voltage Amplifier (MAX5437/MAX5439) o Low Temperature Coefficient 35ppm/C (End-to-End) 5ppm/C (Ratiometric) o Small-Footprint Packages 10-Pin MAX (MAX5436/MAX5438) 14-Pin TSSOP (MAX5437/MAX5439) o Glitchless Switching Between the Resistor Taps o 3-Wire SPI/QSPI/MICROWIRE-Compatible Serial Interface o 50k/100k End-to-End Resistances o Power-On Reset: Wiper Goes to Midscale (Position 64)
MAX5436-MAX5439
Ordering Information
PART MAX5436EUB TEMP RANGE PINPACKAGE RESISTANCE (k) 50 50 100 100
-40C to +85C 10 MAX -40C to +85C 14 TSSOP -40C to +85C 10 MAX -40C to +85C 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 VSS 5 10 VCC 9L SCLK 1 DIN 2 CS 3 SHDN 4 GND 5 VSS 6 OUT 7 14 VCC 13 L 12 W
MAX5436/ MAX5438
8W 7H 6 VDD
MAX5437/ MAX5439
11 H 10 VDD 9 IN+ 8 IN-
MAX
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
VDD to GND, VSS = GND........................................-0.3V to +34V VSS to GND, VDD = GND........................................-34V to +0.3V VDD to VSS ..............................................................-0.3V to +34V VDD to VCC ........................................................-6.3V to +28.75V VCC to VSS ..............................................................-0.3V to +34V VCC to GND ..............................................................-0.3V to +6V DIN, SCLK, CS, SHDN ...............................-0.3V to (VCC + 0.3V) H, L, W, IN+, IN-, OUT .....................(VSS - 0.3V) to (VDD + 0.3V) Maximum Continuous Current into H, L, and W MAX5436-MAX5439.......................................................1mA Continuous Power Dissipation (TA = +70C) 10-Pin MAX (derate 6.94mW/C above +70C) .........556mW 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 = +15V, VSS = -15V, VCC = +5V, VH = VDD, VL = VSS, TA = -40C to +85C, unless otherwise noted. Typical values are at TA = +25C, 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 VCC = 4.75V to 5.25V (Note 4) VCC = 4.75V to 5.25V 2.4 0.8 V V 2N INL DNL WR WC RHL (Note 2) (Note 2) (Note 3) Midscale MAX5437/MAX5439 MAX5436/MAX5438 75 37.5 0.9 6 100 50 125 62.5 128 1 1 2 Taps LSB LSB k pF k RHL = 50k (MAX5436/MAX5438) RHL = 50k (MAX5436/MAX5438) RHL = 100k (MAX5437/MAX5439) RHL = 100k (MAX5437/MAX5439) SYMBOL 2N INL DNL TCR (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
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15V, 128-Tap, Low-Drift Digital Potentiometers
ELECTRICAL CHARACTERISTICS (continued)
(VDD = +15V, VSS = -15V, VCC = +5V, VH = VDD, VL = VSS, TA = -40C to +85C, unless otherwise noted. Typical values are at TA = +25C, unless otherwise noted.)
PARAMETER Input High Voltage Input Low Voltage Input Leakage Current Input Capacitance DYNAMIC CHARACTERISTICS (Analog) RHL = 50k, midscale, VH = 1.5VP-P, CWIPER = 20pF, voltage-divider mode RHL = 100k, midscale, VH = 1.5VP-P, CWIPER = 20pF, voltage-divider mode CWIPER = 20pF, code 1 to code 127, settle to 0.5LSB 400 kHz 200 5 s 5.0 SYMBOL CONDITIONS VCC = 2.7V to 3.6V VCC = 2.7V to 3.6V MIN 2.0 0.6 1.0 TYP MAX UNITS V V A pF
MAX5436-MAX5439
Wiper -3dB Bandwidth
BWW
Wiper Settling Time
tIL
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 VDD VSS 0 -28.8 31.5 0 V V IB VOS VOSD IOS UBWA SR AVO VN CMRI CMRO CMRR PSRR fCLK tCP tCH tCL tCSS tCSH tDS tDH tCSO tCS1 tCSW 0 100 40 40 40 10 40 0 10 40 100 ILOAD = 5mA RLOAD = 100k, VOUT = 14V f = 1kHz VSS + 1 VSS + 1 68 70 10 CLOAD = 250pF 15 6 10 2 100 0.25 100 110 VDD - 2 VDD - 1 nA mV V/C nA kHz V/s 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)
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3
15V, 128-Tap, Low-Drift Digital Potentiometers MAX5436-MAX5439
ELECTRICAL CHARACTERISTICS (continued)
(VDD = +15V, VSS = -15V, VCC = +5V, VH = VDD, VL = VSS, TA = -40C to +85C, unless otherwise noted. Typical values are at TA = +25C, 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 VDS VCC VCS POR ICC IDD (Note 4) MAX5436/MAX5438 SHDN = GND for MAX5437/MAX5439 SHDN = VCC Negative Analog Supply Current ISS MAX5436/MAX5438 SHDN = GND for MAX5437/MAX5439 SHDN = VCC VCC - VSS VDD - VSS CONDITIONS MIN 9.0 2.70 2.7 1.6 30 30 105 55 130 50 60 215 110 250 A TYP MAX 31.5 5.25 31.5 UNITS V V V V A A
Note 1: The DNL and INL are measured with the potentiometer configured as a voltage-divider with H = VDD and L = VSS. 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 = VSS. The wiper terminal is driven with a source current of 80A for the 50k configuration and 40A for the 100k configuration. Note 3: The wiper resistance is measured assuming the source currents given in Note 2. Note 4: Device draws current in excess of the specified supply current when a digital input is driven with a voltage of VIN < VCC 0.6V or VIN > 0.5V. This is due to the CMOS input stage crowbar current. At VIN = 2.4V with VCC = 5.25V, this supply current can be as high as 1.6mA. Note 5: Guaranteed by design and characterization.
4
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15V, 128-Tap, Low-Drift Digital Potentiometers
Typical Operating Characteristics
(VDD = +15V, VSS = -15V, VCC = +5V, VH = VDD, VL = VSS, TA = +25C, unless otherwise noted.)
END-TO-END RESISTANCE % CHANGE vs. TEMPERATURE
MAX5436 toc02
MAX5436-MAX5439
WIPER RESISTANCE vs. INPUT CODE
MAX5436 toc01
WIPER RESISTANCE vs. INPUT CODE
3000 2800 2600 RESISTANCE () 2400 2200 2000 1800 1600 1400 1200 1000 END-TO-END RESISTANCE % CHANGE VDD = +5V VSS = -5V CONDITIONS OF NOTE 2 0.15 0.10 0.05 0 -0.05 -0.10 -0.15 -0.20 -0.25 0 16 32 48 64 80 96 112 128
1075 1050 RESISTANCE () 1025 1000 975 950 925 900 875 850 0
CONDITIONS OF NOTE 2
50k
100k
16
32
48
64
80
96
112 128
-40
-15
10
35
60
85
INPUT CODE
INPUT CODE
TEMPERATURE (C)
W-TO-L RESISTANCE CHANGE vs. INPUT CODE
MAX5436 toc04
DIGITAL SUPPLY CURRENT vs. TEMPERATURE
MAX5436 toc05
MIDSCALE SWITCHING TRANSIENT (CODE 63 TO CODE 64)
MAX5436 toc06
100 90 80 RESISTANCE (k) 70 60 50 40 30 20 10 0 0 16 32 48 64 80 96 50k 100k
40 DIGITAL SUPPLY CURRENT (A) 35 30 25 20 15 10
CS 2V/div
VW-L 100mV/div CWIPER = 20pF
112 128
-40
-15
10
35
60
85
100ns/div
INPUT CODE
TEMPERATURE (C)
VARIABLE-RESISTOR DNL vs. INPUT CODE (50k)
MAX5436 toc07
VARIABLE-RESISTOR DNL vs. INPUT CODE (100k)
MAX5436 toc08
VARIABLE-RESISTOR INL vs. INPUT CODE (50k)
CONDITIONS OF NOTE 2 0.25 0.20 INL (LSB) 0.15 0.10 0.05 0 -0.05 -0.10
MAX5436 toc09
0.10 0.08 0.06 0.04 DNL (LSB) CONDITIONS OF NOTE 2
0.10 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
0.30
0.02 0 -0.02 -0.04 -0.06 -0.08 -0.10 0 16 32 48 64 80 96 112 128 INPUT CODE
0
16
32
48
64
80
96
112 128
0
16
32
48
64
80
96
112 128
INPUT CODE
INPUT CODE
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MAX5436 toc03
1100
5
15V, 128-Tap, Low-Drift Digital Potentiometers MAX5436-MAX5439
Typical Operating Characteristics (continued)
(VDD = +15V, VSS = -15V, VCC = +5V, VH = VDD, VL = VSS, TA = +25C, unless otherwise noted.)
VARIABLE-RESISTOR INL vs. INPUT CODE (100k)
MAX5436 toc10
VOLTAGE-DIVIDER DNL vs. INPUT CODE (50k)
MAX5436 toc11
VOLTAGE-DIVIDER DNL vs. INPUT CODE (100k)
0.008 0.006 0.004 DNL (LSB) 0.002 0 -0.002 -0.004 -0.006 -0.008 -0.010
MAX5436 toc12
0.25 CONDITIONS OF NOTE 2 0.20 0.15
0.010 0.008 0.006 0.004 DNL (LSB) 0.002 0 -0.002 -0.004 -0.006 -0.008 -0.010
0.010
INL (LSB)
0.10 0.05 0 -0.05 -0.10 -0.15 0 16 32 48 64 80 96 112 128 INPUT CODE
0
16
32
48
64
80
96
112 128
0
16
32
48
64
80
96
112 128
INPUT CODE
INPUT CODE
VOLTAGE-DIVIDER INL vs. INPUT CODE (50k)
MAX5436 toc13
VOLTAGE-DIVIDER INL vs. INPUT CODE (100k)
MAX5436 toc14
WIPER FREQUENCY RESPONSE AT MIDSCALE (100k)
-2 -4 -6 GAIN (dB) -8 -10 -12 -14 -16 -18 -20 VH = 1.5VP-P CWIPER = 20pF
MAX5436 toc15
0.05 0.04 0.03 0.02 INL (LSB)
0.05 0.04 0.03 0.02 INL (LSB) 0.01 0 -0.01 -0.02 -0.03 -0.04
0
0.01 0 -0.01 -0.02 -0.03 -0.04 -0.05 0 16 32 48 64 80 96 112 128 INPUT CODE
-0.05 0 16 32 48 64 80 96 112 128 INPUT CODE
0.01
0.1
1
10
100
1000
FREQUENCY (kHz)
AMPLIFIER SMALL-SIGNAL FREQUENCY RESPONSE
MAX5436 toc16
AMPLIFIER OUTPUT vs. OUTPUT LOAD CURRENT
MAX5436 toc17
AMPLIFIER INPUT-REFERRED OFFSET vs. TEMPERATURE
-0.2 -0.4 -0.6 OFFSET (mV)
MAX5436 toc18
5
VIN = 50mVP-P UNITY GAIN
14.000
VIN = +13V GAIN SETTING 1.077
0
0
13.999 AMPLIFIER OUTPUT (V)
GAIN (dB)
-5
13.998
-0.8 -1.0 -1.2 -1.4
-10
13.997
-15
13.996
-1.6 -1.8
-20 0.01 0.1 1 10 100 1000 FREQUENCY (kHz)
13.995 0 2 4 6 8 10 LOAD CURRENT (mA)
-2.0 -40 -15 10 35 60 85 TEMPERATURE (C)
6
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15V, 128-Tap, Low-Drift Digital Potentiometers
Pin Description
PIN MAX5436/ MAX5438 1 2 3 -- 4 5 -- -- -- 6 7 8 9 10 MAX5437/ MAX5439 1 2 3 4 5 6 7 8 9 10 11 12 13 14 NAME SCLK DIN CS SHDN GND VSS OUT ININ+ VDD H W L VCC Serial Clock Input Serial Data Input Chip Select Amplifier Shutdown Analog and Digital Ground Negative Analog Supply. Bypass with a 0.1F capacitor to GND. Amplifier Output Amplifier Negative Input Amplifier Positive Input Positive Analog Supply. Bypass with a 0.1F capacitor to GND. High Terminal of Resistor Wiper Terminal of Resistor Low Terminal of Resistor Digital Supply. Bypass with a 0.1F capacitor to GND. DESCRIPTION
MAX5436-MAX5439
Detailed Description
Digital Interface Operation
The MAX5436-MAX5439 use a 3-wire SPI/QSPI/ MICROWIRE-compatible serial data interface to control the wiper position. This write-only interface contains three inputs: chip select (CS), data in (DIN), and serial clock (SCLK). When CS is taken low, data from DIN is synchronously loaded into the serial shift register on the rising edge of each SCLK pulse (Figure 2). The 8-bit data word requires 8 clock pulses to input the serial data. Note that the first bit of the data word, D7, is unused and should be ignored. Therefore, the second rising edge of SCLK loads the MSB. After all the data bits have been shifted in, they are latched into the potentiometer control register when CS transitions from low to high, the wiper position is then updated. 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.
Adjustable Gain Amplifier
The MAX5436/MAX5438 are used with the MAX427 to make a digitally adjustable gain circuit as shown in Figure 4. The normal feedback resistor is replaced with the MAX5436/MAX5438 in a variable-resistor configuration so that the gain of the circuit can be digitally controlled. The MAX5437/MAX5439 can use the internal high-voltage amplifier to make this digitally adjustable gain circuit.
LCD Biasing Control Applications
The MAX5436-MAX5439 are ideal for LCDs that require separate voltage for contrast control in addition to the main supply voltage. Figure 5a shows the MAX5436- MAX5439 being used for LCD contrast control along with the MAX629, which provides the LCD supply voltage. A similar circuit with an additional buffer circuit is shown in Figure 5b.
Applications Information
Power-Up Sequencing
The MAX5436-MAX5439 have been designed so that any of the supplies can turn on first without causing any unwanted crowbar currents to flow. Note that both digital and analog supplies are required to power up the wiper and uncommitted amplifier (MAX5437/MAX5439 only).
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7
15V, 128-Tap, Low-Drift Digital Potentiometers MAX5436-MAX5439
DATA WORD D7 Don't Care First Bit Loaded D6 (MSB) D5 D4 D3 D2 D1 D0 (LSB) Last Bit Loaded
Figure 1. Serial Data Format
WIPER POSITION UPDATED
CS
SCLK MSB LOADED LAST BIT LOADED
DIN
D7
D6
D5
D4
D3
D2
D1
D0
MSB TIME
LSB
Figure 2. Serial Interface Timing Diagram
CS tCS1 tCL tCH tCP tCSH
tCSW tCSS tCSO
SCLK
tDS tDH DIN
Figure 3. Detailed Serial Interface Timing Diagram
8
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15V, 128-Tap, Low-Drift Digital Potentiometers MAX5436-MAX5439
+15V VS
MAX427
VO
-15V L
R2 H MAX5436- MAX5439 W VO/VS = 1 + R2/R1
R1
Figure 4. Noninverting Amplifier
VBATT
DC/DC CONVERTER (SIMPLIFIED)
CONTROL
VOUT (LCD BIAS)
FIXED 28V IN LCD PANEL
MAX629
MAX5436- MAX5439
16V TO 26V CONTRAST ADJUST MICROCONTROLLER/MICROPROCESSOR
Figure 5a. Simplified LCD Contrast Control Circuit
VBATT
DC/DC CONVERTER (SIMPLIFIED)
CONTROL
VOUT (LCD BIAS)
FIXED 28V IN
LCD PANEL MAX629 MAX5437/ MAX5439
16V TO 26V CONTRAST ADJUST MICROCONTROLLER/MICROPROCESSOR
Figure 5b. Simplified LCD Contrast Control Circuit with Buffer _______________________________________________________________________________________ 9
15V, 128-Tap, Low-Drift Digital Potentiometers MAX5436-MAX5439
Functional Diagrams
VCC R 7 7-BIT SHIFT REGISTER R 7-BIT LATCH H R 7 DECODE 128 W L VDD VSS DIN 7 7-BIT SHIFT REGISTER R 7-BIT LATCH 7 DECODE 128 VCC H W L MAX5437/ MAX5439 SCLK CS GND CLOCK LOGIC POR VDD VSS OUT
DIN
SCLK CS
CLOCK LOGIC
POR
MAX5436/ MAX5438
GND
IN+
IN-
SHDN
Chip Information
TRANSISTOR COUNT: 2556 PROCESS: BiCMOS
10
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15V, 128-Tap, Low-Drift Digital Potentiometers
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)
10LUMAX.EPS
MAX5436-MAX5439
e
10
4X S
10
INCHES MAX DIM MIN 0.043 A 0.006 A1 0.002 A2 0.030 0.037 0.120 D1 0.116 0.118 D2 0.114 0.120 E1 0.116 0.118 E2 0.114 0.199 H 0.187 L 0.0157 0.0275 L1 0.037 REF b 0.007 0.0106 e 0.0197 BSC c 0.0035 0.0078 0.0196 REF S 0 6
MILLIMETERS MAX MIN 1.10 0.15 0.05 0.75 0.95 3.05 2.95 3.00 2.89 3.05 2.95 2.89 3.00 4.75 5.05 0.40 0.70 0.940 REF 0.177 0.270 0.500 BSC 0.090 0.200 0.498 REF 0 6
H y 0.500.1 0.60.1
1
1
0.60.1
TOP VIEW
BOTTOM VIEW
D2 GAGE PLANE A2 A b D1 A1
E2 c E1 L1
L
FRONT VIEW
SIDE VIEW
PROPRIETARY INFORMATION TITLE:
PACKAGE OUTLINE, 10L uMAX/uSOP
APPROVAL DOCUMENT CONTROL NO. REV.
21-0061
I
1 1
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) 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
TSSOP4.40mm.EPS

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