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19-3009; Rev 3; 12/04
Precision-Matched Resistor-Divider in SOT23 MAX5491
General Description
The MAX5491 precision resistor-divider consists of two accurately matched resistors with access to the ends and center of the divider. This device offers excellent resistance matching of 0.035% (A grade), 0.05% (B grade), and 0.1% (C grade). The MAX5491 includes an extremely low resistance-ratio temperature drift of 2ppm/C over -40C to +85C, and has an end-to-end resistance of 30k. Resistance ratios from 1:1 to 30:1 are available. Ten standard ratios are available (see Table 1), and custom ratios are also available upon request. To enhance device and system robustness, the MAX5491 also features 2kV Human Body Model electrostatic discharge (ESD) protection to ensure against real-world ESD events. The MAX5491 is ideal for precision gain-setting applications where tight resistance matching and low temperature drift are necessary. The MAX5491 is available in a space-saving 3-pin SOT23 package, and is guaranteed over the extended -40C to +85C temperature range. Resistance Ratios from 1:1 to 30:1 Custom Ratios Available Upon Request 2kV Human Body Model ESD Protection Tight Initial Ratio Accuracy 0.035% (MAX5491A) 0.05% (MAX5491B) 0.1% (MAX5491C) Low 2ppm/C Resistor-Ratio-Drift Up to 50V Operating Voltage Across Sum of R1 and R2 Tiny 3-Pin SOT23 Package
Features
Applications
Industrial Process Control Instrumentation Precision Gain Setting Medical Equipment Automatic Test Equipment Base Stations
PART
Ordering Information*
TEMP RANGE RATIO PINACCURACY PACKAGE (%) 0.035 0.05 0.1
MAX5491_A_ _ _ _ _ -T -40C to +85C 3 SOT23-3 MAX5491_B_ _ _ _ _ -T -40C to +85C 3 SOT23-3 MAX5491_C_ _ _ _ _ -T -40C to +85C 3 SOT23-3
*See the How to Order section for more details.
Block Diagram
TOP VIEW
P1
Pin Configuration
MAX5491
R1 P3 R2 P2 2 P1 1
MAX5491
3
P3
P2
SOT23
________________________________________________________________ Maxim Integrated Products
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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.
Precision-Matched Resistor-Divider in SOT23 MAX5491
ABSOLUTE MAXIMUM RATINGS
Voltage Between P1 and P2...................................................50V Continuous Current into Any Pin....................................1.75mA Continuous Power Dissipation (TA = +70C) 3-Pin SOT23 (derate 7.1mW/C above +70C).........571.4mW 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.
DC ELECTRICAL CHARACTERISTICS
(TA = -40C to +85C, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER Initial Resistor Ratio Error (Note 2) SYMBOL CONDITIONS MAX5491_A, TA = +25C MAX5491_B, TA = +25C MAX5491_C, TA = +25C Resistance-Ratio Temperature Coefficient (Note 3) Absolute Temperature Coefficient of Resistance Voltage Coefficient of Resistance End-to-End Resistance (R1 + R2) Continuous Current Continuous Working Voltage Between P1 and P2 Power Rating Pin Capacitance Resistance Ratio Long-Term Stability 2000hr at +70C 2 0.03 VP1-P2 IR1, IR2 0 TCR VCR 1:1 ratio 3.2:1 3.2:1 < ratio 10:1 10:1 < ratio 30:1 (Note 4) (Note 5) 28.5 2 4 5.5 35 0.1 30 31.5 1.75 50 87.5 ppm/C ppm/V k mA V mW pF % ppm/C MIN TYP MAX 0.035 0.05 0.1 % UNITS
Note 1: The MAX5491 is 100% production tested at TA = +25C. Specifications over -40C to +85C are guaranteed by design. Note 2: Testing conditions: TA = +25C, VP1-P2 = 9V and 50V.
Note 3: Resistance-ratio temperature coefficient is defined as
R 1 R2 R1 x T R2
Note 4: Absolute TCR is defined as and is tested at 9V and 50V.
(R1 + R2 ) x T
R 1 R2 R1 x V R2
(R1 + R2 )
Note 5: Resistance-ratio voltage coefficient is defined as
2
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Precision-Matched Resistor-Divider in SOT23
Typical Operating Characteristics
(VP1-P2 = 10V, TA = +25C, unless otherwise noted.)
MAX5491
NORMALIZED RESISTOR-RATIO DRIFT vs. TEMPERATURE
MAX5491 toc01
NORMALIZED RESISTOR-RATIO DRIFT vs. TEMPERATURE
300 200 RATIO DRIFT (ppm) 100 0 -100 -200 -300 -400 VP1-P2 = 10V RATIO = 5:1
MAX5491 toc02
400 300 200 RATIO DRIFT (ppm) 100 0 -100 -200 -300 -400 -50 -25 0 25 50 75 VP1-P2 = 10V RATIO = 1:1
400
100
-50
-25
0
25
50
75
100
TEMPERATURE (C)
TEMPERATURE (C)
Pin Description
PIN 1 2 3 NAME P1 P2 P3 R1 Connection Terminal R2 Connection Terminal Midpoint Between R1 and R2 Connection Terminals FUNCTION
Detailed Description
As shown in the Block Diagram, the MAX5491 consists of two precision, low-ratio-drift resistors with an end-toend resistance of 30k (R1 + R2). P3 is the center tap of the divider. The maximum working voltage of the MAX5491 is 50V. This device offers a wide range of
resistance ratios (R1/R2) from 1:1 to 30:1 and is ideally suited for precision operational amplifier gain/attenuation control. The MAX5491 features a 2kV ESD protection that enhances system robustness. A maximum initial ratio accuracy of 0.035% and a low 2ppm/C ratio drift enhance system accuracy.
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Precision-Matched Resistor-Divider in SOT23 MAX5491
Typical Applications
A= VOUT R =- 1 VIN R2
OUT
A=
IN
VOUT R = 1+ 1 VIN R2
OUT
P3
P3
P2 IN R2 R1
MAX5491
P1
P2 R2 R1
MAX5491
P1
Figure 1. Inverting Amplifier Configuration
Figure 2. Noninverting Amplifier Configuration
IN
A=
VOUT R2 = VIN R1 + R2
IN
P1
A=
VOUT R2 = VIN R1 + R2
P1
MAX5491
R1
MAX5491
R1 P3 OUT R2 R2
P3
OUT
P2
P2
Figure 3. Buffered Attenuator
Figure 4. Attenuator with Buffer
Applications Information
Self-Heating and Error
Applying a voltage across terminals P1 and P2 causes the device to heat up due to power dissipation. In highvoltage applications, consider the error in resistanceratio temperature coefficient caused by self-heating. The worst-case self-heating occurs when the operating voltage attains its maximum value. Approximate the result of power dissipation under this condition as: PDISS =
4
The thermal resistance from junction to ambient, J-A, for a 3-pin SOT23 package is 141C/W. Calculate the resulting temperature rise as: T = 83.3mW x 141C/W = 11.7C If the ratio temperature coefficient is 2ppm/C (typ), the total error introduced by self-heating is: 11.7C x 2ppm/C = 23.4ppm
(VMAX )2
R
=
(50V)2
30k
= 83.3mW
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Precision-Matched Resistor-Divider in SOT23
How to Order
PREFIX ROOT PART NUMBER MAX5491 = 30k End-to-End RATIO RANGE L through W. Resistor ratio must fall in the appropriate ratio range. (See Table 2.) RATIO ACCURACY A = 0.035% (max); B = 0.05% (max); C = 0.1% (max) RESISTANCE RATIO Five number ratio designator. Ratios available from 1:1 to 30:1. Format examples: 010000 = 1:1 02500 = 2.5:1 07538 = 7.538:1 25000 = 25:1 TAPE AND REEL MAX 5491 V A 10000 -T
MAX5491
Example Part Numbers
PART MAX5491RA02500-T MAX5491VC10000-T MAX5491SB03200-T MAX5491UA07538-T RESISTOR-RATIO RANGE 2.000 to 2.899 10.000 to 15.999 2.900 to 3.999 6.000 to 9.999 RESISTOR-RATIO ACCURACY (% MAX) 0.035 0.100 0.050 0.035 RESISTOR RATIO 2.5:1 10:1 3.2:1 7.538:1
Table 1. Standard Ratios*
PART MAX5491LA01000-T MAX5491LB01000-T MAX5491LC01000-T MAX5491MA01100-T MAX5491MB01100-T MAX5491MC01100-T MAX5491NA01500-T MAX5491NB01500-T MAX5491NC01500-T MAX5491PA02000-T MAX5491PB02000-T MAX5491PC02000-T MAX5491RA02500-T RESISTOR RATIO 1:1 1:1 1:1 1.1:1 1.1:1 1.1:1 1.5:1 1.5:1 1.5:1 2:1 2:1 2:1 2.5:1 RESISTOR-RATIO SUFFIX 01000 01000 01000 01100 01100 01100 01500 01500 01500 02000 02000 02000 02500 RESISTOR-RATIO ACCURACY (% MAX) 0.035 0.050 0.100 0.035 0.050 0.100 0.035 0.050 0.100 0.035 0.050 0.100 0.035 TOP MARK FZPD FZPE FZPF FZPA FZPB FZPC FZOX FZOY FZOZ FZOO FZOP FZOQ FZPP
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Precision-Matched Resistor-Divider in SOT23 MAX5491
Table 1. Standard Ratios* (continued)
PART MAX5491RB02500-T MAX5491RC02500-T MAX5491SA03200-T MAX5491SB03200-T MAX5491SC03200-T MAX5491TA05000-T MAX5491TB05000-T MAX5491TC05000-T MAX5491UA07538-T MAX5491UB07538-T MAX5491UC07538-T MAX5491VA10000-T MAX5491VB10000-T MAX5491VC10000-T MAX5491WA30000-T MAX5491WB30000-T MAX5491WC30000-T RESISTOR RATIO 2.5:1 2.5:1 3.2:1 3.2:1 3.2:1 5:1 5:1 5:1 7.538:1 7.538:1 7.538:1 10:1 10:1 10:1 30:1 30:1 30:1 RESISTOR-RATIO SUFFIX 02500 02500 03200 03200 03200 05000 05000 05000 07538 07538 07538 10000 10000 10000 30000 30000 30000 RESISTOR-RATIO ACCURACY (% MAX) 0.050 0.100 0.035 0.050 0.100 0.035 0.050 0.100 0.035 0.050 0.100 0.035 0.050 0.100 0.035 0.050 0.100 TOP MARK FZPQ FZON FZOU FZOV FZOW FZOR FZOS FZOT FZPM FZPN FZPO FZPJ FZPK FZPL FZPG FZPH FZPI
*Standard ratios are available for ordering in any quantity. Nonstandard ratios are also available for values between 1:1 to 30:1. A minimum order quantity of 10,000 units is required for nonstandard ratios. Please contact factory for more information.
Table 2. Ratio Ranges
LETTER SUFFIX L M N P R S T U V W RESISTOR-RATIO RANGE 1.000 to 1.099 1.100 to 1.349 1.350 to 1.699 1.700 to 2.000 2.001 to 2.899 2.900 to 3.999 4.000 to 5.999 6.000 to 9.999 10.000 to 15.999 16.000 to 30.000
Chip Information
TRANSISTOR COUNT: 0 PROCESS: BiCMOS
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Precision-Matched Resistor-Divider in SOT23
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.)
MAX5491
PACKAGE OUTLINE, 3L SOT-23
21-0051
F
1
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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 _____________________ 7 (c) 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
SOT23 L.EPS

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