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19-3695; Rev 0; 5/05
10k Precision-Matched Resistor-Divider in SOT23 MAX5492
General Description
The MAX5492 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 MAX5492 includes an extremely low-resistance-ratio temperature drift of 1.5ppm/C (typ) over -55C to +125C, and has an endto-end resistance of 10k. Resistance ratios from 1:1 to 10:1 are available. Five standard ratios are available (see Table 1), and custom ratios are also available upon request. To enhance device and system robustness, the MAX5492 features 2kV Human Body Model electrostatic discharge (ESD) protection to ensure against realworld ESD events. The MAX5492 is ideal for precision gain-setting applications where tight resistance matching and low temperature drift are necessary. The MAX5492 is available in a space-saving 5-pin SOT23 package, and is guaranteed over the military -55C to +125C temperature range. Resistance Ratios from 1:1 to 10:1 Custom Ratios Available Upon Request Tight Initial Ratio Accuracy 0.035% (MAX5492A) 0.05% (MAX5492B) 0.1% (MAX5492C) Low 1.5ppm/C (typ) Resistor-Ratio-Drift (1.1:1) Up to 40V Operating Voltage Across Sum of R1 and R2 Tiny 5-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
MAX5492_A_ _ _ _ _ -T -55C to +125C 5 SOT23-5 MAX5492_B_ _ _ _ _ -T -55C to +125C 5 SOT23-5 MAX5492_C_ _ _ _ _ -T -55C to +125C 5 SOT23-5
*See the How to Order section for more details.
Block Diagram
TOP VIEW MAX5492
P1 R1 SL R2 P2 P3 SH P1 1 SL 2 P2 3
Pin Configuration
5
SH
MAX5492
4 P3
SOT23
________________________________________________________________ Maxim Integrated Products
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10k Precision-Matched Resistor-Divider in SOT23 MAX5492
ABSOLUTE MAXIMUM RATINGS
Voltage Between P1 and P2 ................................................50V Continuous Current into Any Pin......................................4.2mA Continuous Power Dissipation (TA = +70C) 5-Pin SOT23 (derate 7.1mW/C above +70C).........571.4mW 5-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) SYMBOL CONDITIONS MAX5492_A, TA = +25C MAX5492_B, TA = +25C MAX5492_C, TA = +25C Ratio 1.1:1 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 P1, P2, P3, SL, SH Capacitance Resistance-Ratio Stability -3dB Bandwidth Thermal Noise Current Noise Maximum Power Rating f3dB 2000 hours at +70C 1.1:1 ratio (Note 6) (Note 7) (Note 8) VP1-P2 Ratio 1.5:1 Ratio 3.2:1 ratio 10:1 TCR VCR (Note 4) (Note 5) 9.25 -40 2 0.03 30 45 <-30 160 1.5 3 5.5 35 0.1 10 10.75 +40 ppm/C ppm/V k V pF % MHz VRMS dB mW ppm/C MIN TYP MAX 0.035 0.05 0.1 % UNITS
Note 1: The MAX5492 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 40V.
Note 3: Resistance-ratio temperature coefficient is defined
Note 4: Absolute TCR is defined as
(R1 +
(R1 + R2 )
R 1 R2 R1 x T R2
and is guaranteed by design, not production tested.
R2 ) x T
and is tested at 10V and 40V.
Note 5: Resistance-ratio voltage coefficient is defined as
R 1 and is guaranteed by design, not production tested. R2 R1 x V R2
2
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10k 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) Note 6: Calculate bandwidth by using
MAX5492
R x R2 1 where C is CP3 and R = 1 . 2RC R1 + R2
Note 7: Calculated according to
kT noise. C
Note 8: In accordance with the military specification MIL-STD-202G method 308.
Typical Operating Characteristics
(VP1-P3 = 10V, TA = +25C, unless otherwise noted.)
NORMALIZED RESISTANCE-RATIO DRIFT vs. TEMPERATURE
MAX5492 toc01
NORMALIZED RESISTANCE-RATIO DRIFT vs. TEMPERATURE
VP1-P2 = 10V RATIO = 3.2:1
MAX5492 toc02
200 150 100 RATIO DRIFT (ppm) VP1-P2 = 10V RATIO = 1.1:1
600 400 RATIO DRIFT (ppm) 200 0 -200 -400 -600
50 0 -50 -100 -150 -200 -55 -25 5 35 65 95 125 TEMPERATURE (C)
-55
-25
5
35
65
95
125
TEMPERATURE (C)
NORMALIZED RESISTANCE-RATIO DRIFT vs. TEMPERATURE
MAX5492 toc03
RESISTANCE-RATIO ACCURACY vs. VOLTAGE
RATIO = 1.1:1 0.03 RATIO ACCURACY (%) 0.02 0.01 0 -0.01 -0.02 -0.03 -0.04 0 5 10 15 20 25 30 35 40
MAX5492 toc04
500 400 300 RATIO DRIFT (ppm) 200 100 0 -100 -200 -300 -400 -55 -25 5 35 65 95 VP1-P2 = 10V RATIO = 10:1
0.04
125
TEMPERATURE (C)
VOLTAGE (V)
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10k Precision-Matched Resistor-Divider in SOT23 MAX5492
Typical Operating Characteristics (continued)
(VP1-P3 = 10V, TA = +25C, unless otherwise noted.)
FREQUENCY RESPONSE
MAX5492 toc05
SPECTRAL NOISE DENSITY
MAX5492 toc06
TOTAL HARMONIC DISTORTION PLUS NOISE RESPONSE
RATIO = 1.1:1 20Hz TO 20kHz BANDPASS
MAX5492 toc07
6 3 0 RESPONSE (dB) RATIO = 1.1:1 CL = 10pF
100 RATIO = 1.1:1
100 10 1
-6 -9 -12 -15 -18 0.1 1 10 100 1000 10,000 100,000 FREQUENCY (kHz)
VP1-P2 = 10V VP1-P2 = 2V
THD+N (%) 1000
-3
NOISE (nV/Hz)
0.1 0.01 0.001
10 1 10 100 FREQUENCY (Hz)
0.0001 10 100 1k FREQUENCY (Hz) 10k 100k
Pin Description
PIN 1 2 3 4 5 NAME P1 SL P2 P3 SH R1 Connection Terminal Sense Connection for Low Side of Resistor String. Leave floating or connect in a Kelvin connection configuration. R2 Connection Terminal Set-Point Connection Terminal Sense Connection for High Side of Resistor String. Leave floating or connect in a Kelvin connection configuration. FUNCTION
Detailed Description
The MAX5492 consists of two precision, low-ratio-drift resistors with an end-to-end resistance of 10k (R1 + R2). (See Figure 1.) P3 is the set point of the divider. The maximum working voltage of the MAX5492 is 40V. This device offers a wide range of resistance ratios (R1/R2) from 1:1 to 10:1 and is ideally suited for precision operational-amplifier gain/attenuation control. The MAX5492 features a 2kV ESD protection that enhances system robustness. A maximum initial ratio accuracy of 0.035% and a low ratio drift enhance system accuracy.
Applications Information
Kelvin Sensing
Kelvin sensing can improve accuracy in sensitive applications. Apply a voltage or current at P1 and use sense high (SH) and sense low (SL) to monitor the voltage at the upper and lower ends of the resistor string.
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10k Precision-Matched Resistor-Divider in SOT23
Typical Applications
A= VOUT R =- 1 VIN R2 OUT IN A= VOUT R = 1+ 1 VIN R2 OUT
MAX5492
P3
P3
P2 IN R2 R1
MAX5492
P1
P2 R2 R1
MAX5492
P1
Figure 1. Inverting Amplifier Configuration
IN A= VOUT R2 = VIN R1 + R2
Figure 2. Noninverting Amplifier Configuration
IN
P1
A=
VOUT R2 = VIN R1 + R2
P1
MAX5492
R1
MAX5492
R1 P3 OUT R2 R2
P3
OUT
P2
P2
Figure 3. Buffered Attenuator
Figure 4. Attenuator with Buffer
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 =
The thermal resistance from junction to ambient, J-A, for a 5-pin SOT23 package is 141C/W. Calculate the resulting temperature rise as: T = 160mW x 141C/W = 22.5C If the ratio temperature coefficient is 1.5ppm/C (typ), the total error introduced by self-heating is: 22.5C x 1.5ppm/C = 33.75ppm
(VMAX )2
R
=
(40V)2
10k
= 160mW
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10k Precision-Matched Resistor-Divider in SOT23 MAX5492
How to Order
PREFIX ROOT PART NUMBER MAX5492 = 10k 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 10:1. Format examples: 01000 = 1:1 02500 = 2.5:1 07538 = 7.538:1 10000 = 10:1 TAPE AND REEL MAX 5492 V A 10000 -T
Example Part Numbers
PART NUMBER MAX5492PA02500-T MAX5492RB03000-T MAX5492UA07538-T RESISTOR-RATIO RANGE 2.000 to 2.999 3.000 to 3.999 7.538 to 10.0 RESISTOR-RATIO ACCURACY (% MAX) 0.035 0.05 0.035 RESISTOR RATIO 2.5:1 3:1 7.538:1
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10k Precision-Matched Resistor-Divider in SOT23 MAX5492
Table 1. Standard Ratios*
PART NUMBER MAX5492RA01100-T MAX5492RB01100-T MAX5492RC01100-T MAX5492PA01500-T MAX5492PB01500-T MAX5492PC01500-T MAX5492PA03200-T MAX5492PB03200-T MAX5492PC03200-T MAX5492LA07538-T MAX5492LB07538-T MAX5492LC07538-T MAX5492LA10000-T MAX5492LB10000-T MAX5492LC10000-T RESISTOR RATIO 1.1:1 1.1:1 1.1:1 1.5:1 1.5:1 1.5:1 3.2:1 3.2:1 3.2:1 7.538:1 7.538:1 7.538:1 10:1 10:1 10:1 RESISTOR-RATIO SUFFIX 01100 01100 01100 01500 01500 01500 03200 03200 03200 07538 07538 07538 10000 10000 10000 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 AERA AERC AERE AEQU AEQW AEQY AEVE AEVF AEVG AEQB AEQD AEQF AEQC AEQE AEQG
*Standard ratios are available for ordering in any quantity. Nonstandard ratios are also available for values from 1:1 to 10:1. A minimum order quantity of 10,000 units is required for nonstandard ratios. Contact factory for more information.
Table 2. Ratio Ranges
LETTER SUFFIX R P N M L RESISTOR-RATIO RANGE 1.0 to 1.399 1.4 to 1.999 2.0 to 2.999 3.0 to 7.537 7.538 to 10
Chip Information
TRANSISTOR COUNT: 0 PROCESS: BiCMOS
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10k Precision-Matched Resistor-Divider in SOT23 MAX5492
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, SOT-23, 5L
21-0057
E
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.
SOT-23 5L .EPS

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