19-3337; Rev 1; 8/04 100kΩ Precision-Matched Resistor-Divider in SOT23 Features ♦ 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 Applications Ordering Information* Industrial Process Control Instrumentation TEMP RANGE PART Precision Gain Setting RATIO PINACCURACY PACKAGE (%) Medical Equipment MAX5490_A_ _ _ _ _ -T -40°C to +85°C 3 SOT23-3 0.035 Automatic Test Equipment MAX5490_B_ _ _ _ _ -T -40°C to +85°C 3 SOT23-3 0.05 Base Stations MAX5490_C_ _ _ _ _ -T -40°C to +85°C 3 SOT23-3 0.1 *See the How to Order section for more details. Pin Configuration Block Diagram TOP VIEW P1 MAX5490 P1 R1 1 MAX5490 P3 R2 P2 3 P3 P2 2 SOT23 ________________________________________________________________ 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 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 -40°C to +85°C, and has an end-toend resistance of 100kΩ. 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 extended -40°C to +85°C temperature range. MAX5490 100kΩ Precision-Matched Resistor-Divider in SOT23 ABSOLUTE MAXIMUM RATINGS Voltage Between P1 and P2.................................................100V Maximum Current into Any Pin ......................................±1.00mA Continuous Power Dissipation (TA = +70°C) 3-Pin SOT23 (derate 7.1mW/°C above +70°C).........571.4mW 3-Pin SOT23 (θJ-A) .....................................................141°C/W Operating Temperature Range ...........................-40°C to +85°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 = -40°C to +85°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 MAX5490_B, TA = +25°C ±0.05 MAX5490_C, TA = +25°C Resistance-Ratio Temperature Coefficient (Note 3) 1 2 10:1 ≤ ratio ≤ 25:1 2 4 35 TCR (Note 4) Voltage Coefficient of Resistance VCR (Note 5) 95 VP1-P2 Continuous Current % 100 -80 IR1, IR2 ppm/°C ppm/°C 0.1 End-to-End Resistance (R1 + R2) UNITS ±0.1 1:1 ≤ ratio ≤ 10:1 Absolute Temperature Coefficient of Resistance Continuous Working Voltage Between P1 and P2 MAX MAX5490_A, TA = +25°C ppm/V 105 kΩ +80 V 840 µA P1, P2, P3 Capacitance 2 pF Maximum Power Rating 67.2 mW ±0.03 % Resistance Ratio Long-Term Stability -3dB Bandwidth 2000 hours at +70°C f3dB 1:1 ratio (Note 6) Thermal Noise Current Noise In accordance with MIL-STD-2020 method 30B 3 MHz 45 µVRMS -25 dB Note 1: The MAX5490 is 100% production tested at TA = +25°C. Specifications over -40°C to +85°C are guaranteed by design and characterization. Note 2: Testing conditions: TA = +25°C, VP1-P2 = 10V and 80V. Note 3: Resistance-ratio temperature coefficient is defined as For ratios from 25:1 to 100:1, contact factory. Note 4: Absolute TCR is defined as 2 ∆(R1 + R2 ) (R1 + R2 ) × ∆ T ⎛R ⎞ ∆⎜ 1 ⎟ ⎝ R2 ⎠ and is guaranteed by design, not production tested. R1 × ∆T R2 and is tested at 10V and 80V. _______________________________________________________________________________________ 100kΩ Precision-Matched Resistor-Divider in SOT23 MAX5490 DC ELECTRICAL CHARACTERISTICS (continued) (TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) ⎛R ⎞ ∆⎜ 1 ⎟ ⎝ R2 ⎠ R1 × ∆V R2 Note 5: Resistance-ratio voltage coefficient is defined as and is guaranteed by design, not production tested. 1 R ×R , where C = CP3 and R = 1 2 . 2πRC R1 + R2 Note 6: Calculate bandwidth by using Typical Operating Characteristics (VP1-P2 = 10V, TA = +25°C, unless otherwise noted.) MAX5490 toc03 VP1-P2 = 10V RATIO 10:1 80 150 MAX5490 toc02 VP1-P2 = 10V RATIO 1:1 15 120 MAX5490 toc01 20 NORMALIZED RESISTANCE-RATIO DRIFT vs. TEMPERATURE NORMALIZED RESISTANCE-RATIO DRIFT vs. TEMPERATURE NORMALIZED RESISTANCE-RATIO DRIFT vs. TEMPERATURE VP1-P2 = 10V RATIO 25:1 100 0 -5 RATIO DRIFT (ppm) RATIO DRIFT (ppm) 5 40 0 -40 50 0 -50 -10 -100 -80 -15 -150 -120 -20 10 35 60 -40 85 -15 TEMPERATURE (°C) 10 35 60 -40 85 -15 RESISTANCE-RATIO ACCURACY vs. VOLTAGE 0.04 RATIO 25:1 0.03 10 35 60 85 TEMPERATURE (°C) TEMPERATURE (°C) FREQUENCY RESPONSE 6 MAX5490 toc05 -15 MAX5490 toc04 1:1 RATIO CL = 10pF 3 0 0.02 RESPONSE (dB) -40 RATIO ACCURACY (%) RATIO DRIFT (ppm) 10 0.01 0 -0.01 -3 -6 -9 -0.02 -12 -0.03 -15 -18 -0.04 0 10 20 30 40 50 VOLTAGE (V) 60 70 80 0.1 1 10 100 1000 FREQUENCY (kHz) _______________________________________________________________________________________ 3 Typical Operating Characteristics (continued) (VP1-P2 = 10V, TA = +25°C, unless otherwise noted.) THD+N RESPONSE SPECTRAL NOISE DENSITY RATIO 1:1 SIGNAL CONNECTED TO P2 P1 GROUNDED 1:1 RATIO 20Hz TO 20kHz BANDPASS 10 VP1-P2 = 10V MAX5490 toc07 100 MAX5490 toc06 1000 1 THD+N (%) NOISE (nV/√Hz) MAX5490 100kΩ Precision-Matched Resistor-Divider in SOT23 100 VP1-P2 = 2V 0.1 0.01 0.001 10 0.0001 1 10 100 1k 10 100 FREQUENCY (Hz) 1k 10k 100k FREQUENCY (Hz) Pin Description PIN NAME 1 P1 R1 Connection Terminal FUNCTION 2 P2 R2 Connection Terminal 3 P3 Set-Point Connection Terminal Detailed Description As shown in the Block Diagram, the MAX5490 consists of two precision, low-ratio-drift resistors with an end-toend resistance of 100kΩ (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. 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. 4 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 100kΩ = 64mW The thermal resistance from junction to ambient, θJ-A, for a 3-pin SOT23 package is 141°C/W. Calculate the resulting temperature rise as: ∆T = 64mW x 141°C/W = 9.02°C If the ratio temperature coefficient is 1ppm/°C (typ), the total error introduced by self-heating is: 9.02°C x 1ppm/°C = 9.02ppm _______________________________________________________________________________________ 100kΩ Precision-Matched Resistor-Divider in SOT23 A = VOUT R = − 1 VIN R2 A = VOUT R = 1+ 1 VIN R2 IN OUT OUT P3 P3 MAX5490 P2 MAX5490 P2 P1 P1 IN R2 R2 R1 Figure 1. Inverting Amplifier Configuration Figure 2. Noninverting Amplifier Configuration IN IN A = R1 P1 VOUT R2 = VIN R1 + R2 P1 A = MAX5490 VOUT R2 = VIN R1 + R2 R1 P3 MAX5490 R1 R2 OUT P3 OUT R2 P2 P2 Figure 3. Buffered Attenuator Figure 4. Attenuator with Buffer _______________________________________________________________________________________ 5 MAX5490 Typical Applications 100kΩ Precision-Matched Resistor-Divider in SOT23 MAX5490 How to Order PREFIX MAX 5490 V A 10000 -T ROOT PART NUMBER MAX5490 = 100kΩ 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 Example Part Numbers RESISTOR-RATIO RANGE RESISTOR-RATIO ACCURACY (% MAX) RESISTOR RATIO MAX5490PA02500-T 2.000 to 2.999 0.035 2.5:1 MAX5490RB03000-T 3.000 to 3.999 0.05 3:1 MAX5490UA07538-T 7.538 to 9.999 0.035 7.538:1 MAX5490VC10000-T 10.000 to 19.999 0.1 10:1 PART NUMBER 6 _______________________________________________________________________________________ 100kΩ Precision-Matched Resistor-Divider in SOT23 MAX5490 Table 1. Standard Ratios* PART NUMBER RESISTOR RATIO RESISTOR-RATIO SUFFIX RESISTOR-RATIO ACCURACY (% MAX) TOP MARK MAX5490GA01000-T 1:1 01000 0.035 FZQG MAX5490GB01000-T 1:1 01000 0.05 FZQH MAX5490GC01000-T 1:1 01000 0.1 FZQI MAX5490MA02000-T 2:1 02000 0.035 FZRQ MAX5490MB02000-T 2:1 02000 0.05 FZRR MAX5490MC02000-T 2:1 02000 0.1 FZRS MAX5490TA05000-T 5:1 05000 0.035 FZQJ MAX5490TB05000-T 5:1 05000 0.05 FZQK MAX5490TC05000-T 5:1 05000 0.1 FZQL MAX5490VA10000-T 10:1 10000 0.035 FZQP MAX5490VB10000-T 10:1 10000 0.05 FZQQ MAX5490VC10000-T 10:1 10000 0.1 FZQR MAX5490XA25000-T 25:1 25000 0.035 FZQV MAX5490XB25000-T 25:1 25000 0.05 FZQW MAX5490XC25000-T 25:1 25000 0.1 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 RESISTOR-RATIO RANGE G 1.0 to 1.099 H 1.1 to 1.199 J 1.2 to 1.399 K 1.4 to 1.599 L 1.6 to 1.899 M 1.9 to 2.099 N 2.1 to 2.499 P 2.5 to 2.999 R 3.0 to 3.499 S 3.5 to 4.499 T 4.5 to 5.999 U 6.0 to 8.999 V 9.0 to 13.999 W 14.0 to 24.999 X 25.0 to 49.999 Y 50.0 to 74.999 Z 75.0 to 100.0 Chip Information 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.) SOT23 L.EPS MAX5490 100kΩ Precision-Matched Resistor-Divider in SOT23 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 © 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.