19-3695; Rev 0; 5/05 10kΩ Precision-Matched Resistor-Divider in SOT23 Features ♦ 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 Ordering Information* Applications Industrial Process Control TEMP RANGE PART Instrumentation Precision Gain Setting RATIO PINACCURACY PACKAGE (%) MAX5492_A_ _ _ _ _ -T -55°C to +125°C 5 SOT23-5 0.035 MAX5492_B_ _ _ _ _ -T -55°C to +125°C 5 SOT23-5 0.05 Automatic Test Equipment MAX5492_C_ _ _ _ _ -T -55°C to +125°C 5 SOT23-5 0.1 Base Stations *See the How to Order section for more details. Medical Equipment Pin Configuration Block Diagram TOP VIEW MAX5492 SH P1 P1 1 R1 SL SL 2 P3 R2 5 SH 4 P3 MAX5492 P2 3 SOT23 P2 ________________________________________________________________ Maxim Integrated Products 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. 1 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 -55°C to +125°C, and has an endto-end resistance of 10kΩ. 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 -55°C to +125°C temperature range. MAX5492 10kΩ Precision-Matched Resistor-Divider in SOT23 ABSOLUTE MAXIMUM RATINGS Voltage Between P1 and P2 ................................................±50V Continuous Current into Any Pin......................................±4.2mA Continuous Power Dissipation (TA = +70°C) 5-Pin SOT23 (derate 7.1mW/°C above +70°C).........571.4mW 5-Pin SOT23 (θJ-A) .....................................................141°C/W Operating Temperature Range .........................-55°C to +125°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C 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 = -55°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL Initial Resistor-Ratio Error (Note 2) CONDITIONS MIN TYP ±0.035 MAX5492_B, TA = +25°C ±0.05 MAX5492_C, TA = +25°C Resistance-Ratio Temperature Coefficient (Note 3) Absolute Temperature Coefficient of Resistance Voltage Coefficient of Resistance UNITS % ±0.1 Ratio 1.1:1 1.5 Ratio 1.5:1 3 Ratio 3.2:1 ≤ ratio ≤ 10:1 5.5 TCR (Note 4) 35 VCR (Note 5) ppm/°C ppm/°C 0.1 End-to-End Resistance (R1 + R2) Continuous Working Voltage Between P1 and P2 MAX MAX5492_A, TA = +25°C 9.25 VP1-P2 10 -40 P1, P2, P3, SL, SH Capacitance 2 ppm/V 10.75 kΩ +40 V pF ±0.03 % 1.1:1 ratio (Note 6) 30 MHz Thermal Noise (Note 7) 45 µVRMS Current Noise (Note 8) <-30 dB 160 mW Resistance-Ratio Stability -3dB Bandwidth 2000 hours at +70°C f3dB Maximum Power Rating Note 1: The MAX5492 is 100% production tested at TA = +25°C. Specifications over -55°C to +125°C are guaranteed by design and characterization. Note 2: Testing conditions: TA = +25°C, VP1-P2 = 10V and 40V. Note 3: Resistance-ratio temperature coefficient is defined Note 4: Absolute TCR is defined as ∆(R1 + R2 ) (R1 + R2 ) × ∆ T Note 5: Resistance-ratio voltage coefficient is defined as 2 ⎛R ⎞ ∆⎜ 1 ⎟ ⎝ R2 ⎠ R1 × ∆T R2 and is guaranteed by design, not production tested. and is tested at 10V and 40V. ⎛R ⎞ ∆⎜ 1 ⎟ and is guaranteed by design, not production tested. ⎝ R2 ⎠ R1 × ∆V R2 _______________________________________________________________________________________ 10kΩ Precision-Matched Resistor-Divider in SOT23 MAX5492 DC ELECTRICAL CHARACTERISTICS (continued) (TA = -55°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) Note 6: Calculate bandwidth by using Note 7: Calculated according to R × R2 1 where C is CP3 and R = 1 . 2πRC R1 + R2 kT noise. C Note 8: In accordance with the military specification MIL-STD-202G method 308. Typical Operating Characteristics (VP1-P3 = 10V, TA = +25°C, unless otherwise noted.) NORMALIZED RESISTANCE-RATIO DRIFT vs. TEMPERATURE MAX5492 toc02 VP1-P2 = 10V RATIO = 1.1:1 150 600 MAX5492 toc01 200 NORMALIZED RESISTANCE-RATIO DRIFT vs. TEMPERATURE VP1-P2 = 10V RATIO = 3.2:1 400 RATIO DRIFT (ppm) RATIO DRIFT (ppm) 100 50 0 -50 200 0 -200 -100 -400 -150 -200 -600 -55 -25 5 35 65 95 -55 -25 5 35 65 95 TEMPERATURE (°C) TEMPERATURE (°C) NORMALIZED RESISTANCE-RATIO DRIFT vs. TEMPERATURE RESISTANCE-RATIO ACCURACY vs. VOLTAGE RATIO = 1.1:1 0.03 RATIO ACCURACY (%) 300 200 100 0 -100 125 MAX5492 toc04 VP1-P2 = 10V RATIO = 10:1 400 0.04 MAX5492 toc03 500 RATIO DRIFT (ppm) 125 0.02 0.01 0 -0.01 -0.02 -200 -0.03 -300 -0.04 -400 -55 -25 5 35 65 TEMPERATURE (°C) 95 125 0 5 10 15 20 25 30 35 40 VOLTAGE (V) _______________________________________________________________________________________ 3 Typical Operating Characteristics (continued) (VP1-P3 = 10V, TA = +25°C, unless otherwise noted.) RATIO = 1.1:1 MAX5492 toc07 100 MAX5492 toc06 RATIO = 1.1:1 CL = 10pF 3 100 MAX5492 toc05 6 TOTAL HARMONIC DISTORTION PLUS NOISE RESPONSE SPECTRAL NOISE DENSITY FREQUENCY RESPONSE RATIO = 1.1:1 20Hz TO 20kHz BANDPASS 10 0 -3 -6 -9 THD+N (%) 1 NOISE (nV/√Hz) RESPONSE (dB) MAX5492 10kΩ Precision-Matched Resistor-Divider in SOT23 VP1-P2 = 10V VP1-P2 = 2V 0.1 0.01 -12 0.001 -15 10 -18 0.1 1 10 100 1000 10,000 100,000 0.0001 1 10 100 1000 FREQUENCY (Hz) FREQUENCY (kHz) 10 100 1k 10k 100k FREQUENCY (Hz) Pin Description PIN NAME FUNCTION 1 P1 R1 Connection Terminal 2 SL Sense Connection for Low Side of Resistor String. Leave floating or connect in a Kelvin connection configuration. 3 P2 R2 Connection Terminal 4 P3 Set-Point Connection Terminal 5 SH Sense Connection for High Side of Resistor String. Leave floating or connect in a Kelvin connection configuration. Detailed Description The MAX5492 consists of two precision, low-ratio-drift resistors with an end-to-end resistance of 10kΩ (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. 4 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. _______________________________________________________________________________________ 10kΩ Precision-Matched Resistor-Divider in SOT23 A = VOUT R = − 1 VIN R2 A = IN VOUT R = 1+ 1 VIN R2 OUT OUT P3 P3 MAX5492 P2 P1 R2 MAX5492 P2 IN R1 R2 Figure 1. Inverting Amplifier Configuration P1 R1 Figure 2. Noninverting Amplifier Configuration IN A = VOUT R2 = VIN R1 + R2 IN A = P1 VOUT R2 = VIN R1 + R2 MAX5492 P1 R1 MAX5492 P3 R1 P3 OUT R2 OUT R2 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 = (VMAX )2 R = (40V)2 10kΩ The thermal resistance from junction to ambient, θJ-A, for a 5-pin SOT23 package is 141°C/W. Calculate the resulting temperature rise as: ∆T = 160mW x 141°C/W = 22.5°C If the ratio temperature coefficient is 1.5ppm/°C (typ), the total error introduced by self-heating is: 22.5°C x 1.5ppm/°C = 33.75ppm = 160mW _______________________________________________________________________________________ 5 MAX5492 Typical Applications 10kΩ Precision-Matched Resistor-Divider in SOT23 MAX5492 How to Order PREFIX MAX 5492 V A 10000 -T ROOT PART NUMBER MAX5492 = 10kΩ 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 Example Part Numbers 6 PART NUMBER RESISTOR-RATIO RANGE RESISTOR-RATIO ACCURACY (% MAX) RESISTOR RATIO MAX5492PA02500-T 2.000 to 2.999 0.035 2.5:1 MAX5492RB03000-T 3.000 to 3.999 0.05 3:1 MAX5492UA07538-T 7.538 to 10.0 0.035 7.538:1 _______________________________________________________________________________________ 10kΩ Precision-Matched Resistor-Divider in SOT23 MAX5492 Table 1. Standard Ratios* PART NUMBER RESISTOR RATIO RESISTOR-RATIO SUFFIX RESISTOR-RATIO ACCURACY (% MAX) MAX5492RA01100-T 1.1:1 01100 0.035 AERA MAX5492RB01100-T 1.1:1 01100 0.05 AERC MAX5492RC01100-T 1.1:1 01100 0.1 AERE MAX5492PA01500-T 1.5:1 01500 0.035 AEQU MAX5492PB01500-T 1.5:1 01500 0.05 AEQW MAX5492PC01500-T 1.5:1 01500 0.1 AEQY MAX5492PA03200-T 3.2:1 03200 0.035 AEVE MAX5492PB03200-T 3.2:1 03200 0.05 AEVF MAX5492PC03200-T 3.2:1 03200 0.1 AEVG MAX5492LA07538-T 7.538:1 07538 0.035 AEQB MAX5492LB07538-T 7.538:1 07538 0.05 AEQD MAX5492LC07538-T 7.538:1 07538 0.1 AEQF AEQC TOP MARK MAX5492LA10000-T 10:1 10000 0.035 MAX5492LB10000-T 10:1 10000 0.05 AEQE MAX5492LC10000-T 10:1 10000 0.1 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. Chip Information Table 2. Ratio Ranges LETTER SUFFIX RESISTOR-RATIO RANGE R 1.0 to 1.399 P 1.4 to 1.999 N 2.0 to 2.999 M 3.0 to 7.537 L 7.538 to 10 TRANSISTOR COUNT: 0 PROCESS: BiCMOS _______________________________________________________________________________________ 7 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.) SOT-23 5L .EPS MAX5492 10kΩ Precision-Matched Resistor-Divider in SOT23 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 © 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.