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19-3337; Rev 2; 3/05
100k Precision-Matched Resistor-Divider in SOT23 MAX5490
General Description
The MAX5490 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 MAX5490 provides an extremely low resistance-ratio temperature drift of 1ppm/C (typ) over -55C to +125C, and has an end-toend resistance of 100k. Resistance ratios from 1:1 to 100:1 are available. Five standard ratios are available (see Table 1), and custom ratios are also available upon request. The MAX5490 is ideal for precision gain-setting applications where tight resistance matching and low temperature drift are necessary. The MAX5490 is available in a space-saving 3-pin SOT23 package, and is guaranteed over the military -55C to +125C temperature range. Resistance Ratios from 1:1 to 100:1 Custom Ratios Available Upon Request Tight Initial Ratio Accuracy 0.035% (MAX5490A) 0.05% (MAX5490B) 0.1% (MAX5490C) Low 1ppm/C (typ) Resistor-Ratio-Drift Up to 80V 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
MAX5490_A_ _ _ _ _ -T -55C to +125C 3 SOT23-3 MAX5490_B_ _ _ _ _ -T -55C to +125C 3 SOT23-3 MAX5490_C_ _ _ _ _ -T -55C to +125C 3 SOT23-3
*See the How to Order section for more details.
Block Diagram
TOP VIEW
P1
Pin Configuration
MAX5490
R1 P3 R2 P2 2 P1 1
MAX5490
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.
100k Precision-Matched Resistor-Divider in SOT23 MAX5490
ABSOLUTE MAXIMUM RATINGS
Voltage Between P1 and P2.................................................100V Maximum Current into Any Pin ......................................1.00mA Continuous Power Dissipation (TA = +70C) 3-Pin SOT23 (derate 7.1mW/C above +70C).........571.4mW 3-Pin SOT23 (J-A) .....................................................141C/W Operating Temperature Range .........................-55C to +125C 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 = -55C to +125C, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER Initial Resistor Ratio Error (Note 2) Resistance-Ratio Temperature Coefficient (Note 3) Absolute Temperature Coefficient of Resistance Voltage Coefficient of Resistance End-to-End Resistance (R1 + R2) Continuous Working Voltage Between P1 and P2 Continuous Current P1, P2, P3 Capacitance Maximum Power Rating Resistance Ratio Long-Term Stability -3dB Bandwidth Thermal Noise Current Noise In accordance with MIL-STD-2020 method 30B f3dB 2000 hours at +70C 1:1 ratio (Note 6) VP1-P2 IR1, IR2 2 67.2 0.03 3 45 -25 TCR VCR SYMBOL CONDITIONS MAX5490_A, TA = +25C MAX5490_B, TA = +25C MAX5490_C, TA = +25C 1:1 ratio 10:1 10:1 ratio 25:1 (Note 4) (Note 5) TA = +25C 95 -80 1 2 35 0.1 100 105 +80 840 MIN TYP MAX 0.035 0.05 0.1 2 4 ppm/C ppm/C ppm/V k V A pF mW % MHz VRMS dB % UNITS
Note 1: The MAX5490 is 100% production tested at TA = +25C. Specifications over -55C to +125C are guaranteed by design and characterization. Note 2: Testing conditions: TA = +25C, VP1-P2 = 10V and 80V.
Note 3: Resistance-ratio temperature coefficient is defined as For ratios from 25:1 to 100:1, contact factory.
R 1 R2 and is guaranteed by design, not production tested. R1 x T R2
Note 4: Absolute TCR is defined as
(R1 +
(R1 + R2 )
R2 ) x T
and is tested at 10V and 80V.
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100k Precision-Matched Resistor-Divider in SOT23
DC ELECTRICAL CHARACTERISTICS (continued)
(TA = -55C to +125C, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
MAX5490
Note 5: Resistance-ratio voltage coefficient is defined as
R 1 R2 R1 x V R2
and is guaranteed by design, not production tested.
Note 6: Calculate bandwidth by using
1 R xR , where C = CP3 and R = 1 2 . 2RC R1 + R2
Typical Operating Characteristics
(VP1-P2 = 10V, TA = +25C, unless otherwise noted.)
NORMALIZED RESISTANCE-RATIO DRIFT vs. TEMPERATURE
MAX5490 toc01
NORMALIZED RESISTANCE-RATIO DRIFT vs. TEMPERATURE
MAX5490 toc02
NORMALIZED RESISTANCE-RATIO DRIFT vs. TEMPERATURE
150 100 RATIO DRIFT (ppm) 50 0 -50 -100 -150 -200 -55 -25 5 35 65 95 125 VP1-P2 = 10V RATIO 25:1
MAX5490 toc03
50 40 30 RATIO DRIFT (ppm) 20 10 0 -10 -20 -30 -55 -25 5 35 65 95 VP1-P2 = 10V RATIO 1:1
160 120 RATIO DRIFT (ppm) 80 40 0 -40 -80 -120 VP1-P2 = 10V RATIO 10:1
200
125
-55
-25
5
35
65
95
125
TEMPERATURE (C)
TEMPERATURE (C)
TEMPERATURE (C)
RESISTANCE-RATIO ACCURACY vs. VOLTAGE
MAX5490 toc04
FREQUENCY RESPONSE
3 0 RESPONSE (dB) -3 -6 -9 -12 -15 -18 0.1 1 10 FREQUENCY (kHz) 100 1000 1:1 RATIO CL = 10pF
MAX5490 toc05
0.04 RATIO 25:1 0.03 RATIO ACCURACY (%) 0.02 0.01 0 -0.01 -0.02 -0.03 -0.04 0 10 20 30 40 50 60 70
6
80
VOLTAGE (V)
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100k Precision-Matched Resistor-Divider in SOT23 MAX5490
Typical Operating Characteristics (continued)
(VP1-P2 = 10V, TA = +25C, unless otherwise noted.)
TOTAL HARMONIC DISTORTION PLUS NOISE RESPONSE
MAX5490 toc06
SPECTRAL NOISE DENSITY
1000 RATIO 1:1 SIGNAL CONNECTED TO P2 P1 GROUNDED VP1-P2 = 10V 100 VP1-P2 = 2V THD+N (%) 100 10 1 0.1 0.01 0.001 10 1 10 100 1k FREQUENCY (Hz) 0.0001 10
1:1 RATIO 20Hz TO 20kHz BANDPASS
NOISE (nV/Hz)
100
1k FREQUENCY (Hz)
10k
100k
Pin Description
PIN 1 2 3 NAME P1 P2 P3 R1 Connection Terminal R2 Connection Terminal Set-Point Connection Terminal FUNCTION
Detailed Description
As shown in the Block Diagram, the MAX5490 consists of two precision, low-ratio-drift resistors with an end-toend resistance of 100k (R1 + R2). P3 is the set point of the divider. The maximum working voltage of the MAX5490 is 80V. This device offers a wide range of resistance ratios (R1/R2) from 1:1 to 100:1 and is ideal for precision operational amplifier gain/attenuation control. A maximum initial ratio accuracy of 0.035% and a low 1ppm/C ratio drift enhance system accuracy.
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 =
(VMAX )2
R
=
(80V)2
100k
MAX5490 toc07
= 64mW
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 = 64mW x 141C/W = 9.02C If the ratio temperature coefficient is 1ppm/C (typ), the total error introduced by self-heating is: 9.02C x 1ppm/C = 9.02ppm
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.
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100k Precision-Matched Resistor-Divider in SOT23
Typical Applications
A= VOUT R =- 1 VIN R2 IN OUT OUT A= VOUT R = 1+ 1 VIN R2
MAX5490
P3
P3
P2 IN R2 R1
MAX5490
P1
P2 R2 R1
MAX5490
P1
Figure 1. Inverting Amplifier Configuration
Figure 2. Noninverting Amplifier Configuration
IN
IN
P1
A=
VOUT R2 = VIN R1 + R2
A=
MAX5490
R1 P3
VOUT R2 = VIN R1 + R2
P1
MAX5490
R1 P3 OUT R2 P2 P2 R2 OUT
Figure 3. Buffered Attenuator
Figure 4. Attenuator with Buffer
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100k Precision-Matched Resistor-Divider in SOT23 MAX5490
How to Order
PREFIX ROOT PART NUMBER MAX5490 = 100k 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 100:1. Format examples: 01000 = 1:1 02500 = 2.5:1 07538 = 7.538:1 00000 = 100:1 TAPE AND REEL MAX 5490 V A 10000 -T
Example Part Numbers
PART NUMBER MAX5490PA02500-T MAX5490RB03000-T MAX5490UA07538-T MAX5490VC10000-T RESISTOR-RATIO RANGE 2.000 to 2.999 3.000 to 3.999 7.538 to 9.999 10.000 to 19.999 RESISTOR-RATIO ACCURACY (% MAX) 0.035 0.05 0.035 0.1 RESISTOR RATIO 2.5:1 3:1 7.538:1 10:1
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100k Precision-Matched Resistor-Divider in SOT23 MAX5490
Table 1. Standard Ratios*
PART NUMBER MAX5490GA01000-T MAX5490GB01000-T MAX5490GC01000-T MAX5490MA02000-T MAX5490MB02000-T MAX5490MC02000-T MAX5490TA05000-T MAX5490TB05000-T MAX5490TC05000-T MAX5490VA10000-T MAX5490VB10000-T MAX5490VC10000-T MAX5490XA25000-T MAX5490XB25000-T MAX5490XC25000-T RESISTOR RATIO 1:1 1:1 1:1 2:1 2:1 2:1 5:1 5:1 5:1 10:1 10:1 10:1 25:1 25:1 25:1 RESISTOR-RATIO SUFFIX 01000 01000 01000 02000 02000 02000 05000 05000 05000 10000 10000 10000 25000 25000 25000 RESISTOR-RATIO ACCURACY (% MAX) 0.035 0.05 0.1 0.035 0.05 0.1 0.035 0.05 0.1 0.035 0.05 0.1 0.035 0.05 0.1 TOP MARK FZQG FZQH FZQI FZRQ FZRR FZRS FZQJ FZQK FZQL FZQP FZQQ FZQR FZQV FZQW FZQX
*Standard ratios are available for ordering in any quantity. Nonstandard ratios are also available for values between 1:1 to 100:1. 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 G H J K L M N P R S T U V W X Y Z RESISTOR-RATIO RANGE 1.0 to 1.099 1.1 to 1.199 1.2 to 1.399 1.4 to 1.599 1.6 to 1.899 1.9 to 2.099 2.1 to 2.499 2.5 to 2.999 3.0 to 3.499 3.5 to 4.499 4.5 to 5.999 6.0 to 8.999 9.0 to 13.999 14.0 to 24.999 25.0 to 49.999 50.0 to 74.999 75.0 to 100.0
Chip Information
TRANSISTOR COUNT: 0 PROCESS: BiCMOS
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100k Precision-Matched Resistor-Divider in SOT23 MAX5490
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.)
PACKAGE OUTLINE, 3L SOT-23
21-0051
F
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.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.
SOT23 L.EPS

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