19-3009; Rev 3; 12/04 Precision-Matched Resistor-Divider in SOT23 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 -40°C to +85°C, and has an end-to-end resistance of 30kΩ. 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 -40°C to +85°C temperature range. Features ♦ 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 Ordering Information* Applications Industrial Process Control TEMP RANGE PART Instrumentation Precision Gain Setting Medical Equipment Automatic Test Equipment Base Stations RATIO PINACCURACY PACKAGE (%) MAX5491_A_ _ _ _ _ -T -40°C to +85°C 3 SOT23-3 0.035 MAX5491_B_ _ _ _ _ -T -40°C to +85°C 3 SOT23-3 0.05 MAX5491_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 MAX5491 P1 R1 1 MAX5491 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 MAX5491 General Description MAX5491 Precision-Matched Resistor-Divider in SOT23 ABSOLUTE MAXIMUM RATINGS Voltage Between P1 and P2...................................................50V Continuous Current into Any Pin....................................±1.75mA Continuous Power Dissipation (TA = +70°C) 3-Pin SOT23 (derate 7.1mW/°C above +70°C).........571.4mW 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 ±0.035 ±0.05 MAX5491_C, TA = +25°C ±0.1 4 10:1 < ratio ≤ 30:1 5.5 35 (Note 4) Voltage Coefficient of Resistance VCR (Note 5) 28.5 30 IR1, IR2 VP1-P2 0 Power Rating Pin Capacitance 2000hr at +70°C % ppm/°C ppm/°C 0.1 End-to-End Resistance (R1 + R2) UNITS 2 3.2:1 < ratio ≤ 10:1 TCR Resistance Ratio Long-Term Stability MAX MAX5491_B, TA = +25°C Absolute Temperature Coefficient of Resistance Continuous Current TYP MAX5491_A, TA = +25°C 1:1 ≤ ratio ≤ 3.2:1 Resistance-Ratio Temperature Coefficient (Note 3) Continuous Working Voltage Between P1 and P2 MIN ppm/V 31.5 kΩ ±1.75 mA 50 V 87.5 mW 2 pF ±0.03 % Note 1: The MAX5491 is 100% production tested at TA = +25°C. Specifications over -40°C to +85°C are guaranteed by design. Note 2: Testing conditions: TA = +25°C, VP1-P2 = 9V and 50V. Note 3: Resistance-ratio temperature coefficient is defined as Note 4: Absolute TCR is defined as and is tested at 9V and 50V. ∆(R1 + R2 ) (R1 + R2 ) × ∆ T Note 5: Resistance-ratio voltage coefficient is defined as 2 ⎛R ⎞ ∆⎜ 1 ⎟ ⎝ R2 ⎠ R1 × ∆T R2 ⎛R ⎞ ∆⎜ 1 ⎟ ⎝ R2 ⎠ R1 × ∆V R2 _______________________________________________________________________________________ Precision-Matched Resistor-Divider in SOT23 NORMALIZED RESISTOR-RATIO DRIFT vs. TEMPERATURE 300 400 200 200 RATIO DRIFT (ppm) RATIO DRIFT (ppm) VP1-P2 = 10V RATIO = 5:1 300 MAX5491 toc02 VP1-P2 = 10V RATIO = 1:1 MAX5491 toc01 400 NORMALIZED RESISTOR-RATIO DRIFT vs. TEMPERATURE 100 0 -100 100 0 -100 -200 -200 -300 -300 -400 -400 -50 -25 0 25 50 75 100 -50 TEMPERATURE (°C) -25 0 25 50 75 100 TEMPERATURE (°C) Pin Description PIN NAME FUNCTION 1 P1 R1 Connection Terminal 2 P2 R2 Connection Terminal 3 P3 Midpoint Between R1 and R2 Connection Terminals Detailed Description As shown in the Block Diagram, the MAX5491 consists of two precision, low-ratio-drift resistors with an end-toend resistance of 30kΩ (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. _______________________________________________________________________________________ 3 MAX5491 Typical Operating Characteristics (VP1-P2 = 10V, TA = +25°C, unless otherwise noted.) Precision-Matched Resistor-Divider in SOT23 MAX5491 Typical Applications A = VOUT R = − 1 VIN R2 A = IN VOUT R = 1+ 1 VIN R2 OUT OUT P3 P3 MAX5491 P2 P1 R2 MAX5491 P2 IN R1 R2 Figure 1. Inverting Amplifier Configuration R1 Figure 2. Noninverting Amplifier Configuration IN A = P1 VOUT R2 = VIN R1 + R2 IN A = P1 VOUT R2 = VIN R1 + R2 MAX5491 P1 R1 MAX5491 P3 R1 P3 OUT R2 OUT R2 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 (VMAX )2 R = (50V)2 30kΩ 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 = 83.3mW x 141°C/W = 11.7°C If the ratio temperature coefficient is 2ppm/°C (typ), the total error introduced by self-heating is: 11.7°C x 2ppm/°C = 23.4ppm = 83.3mW _______________________________________________________________________________________ Precision-Matched Resistor-Divider in SOT23 PREFIX MAX 5491 V A 10000 -T ROOT PART NUMBER MAX5491 = 30kΩ 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 Example Part Numbers PART RESISTOR-RATIO RANGE RESISTOR-RATIO ACCURACY (% MAX) RESISTOR RATIO MAX5491RA02500-T 2.000 to 2.899 0.035 2.5:1 MAX5491VC10000-T 10.000 to 15.999 0.100 10:1 MAX5491SB03200-T 2.900 to 3.999 0.050 3.2:1 MAX5491UA07538-T 6.000 to 9.999 0.035 7.538:1 Table 1. Standard Ratios* RESISTOR RATIO RESISTOR-RATIO SUFFIX RESISTOR-RATIO ACCURACY (% MAX) TOP MARK MAX5491LA01000-T 1:1 01000 0.035 FZPD MAX5491LB01000-T 1:1 01000 0.050 FZPE MAX5491LC01000-T 1:1 01000 0.100 FZPF MAX5491MA01100-T 1.1:1 01100 0.035 FZPA MAX5491MB01100-T 1.1:1 01100 0.050 FZPB MAX5491MC01100-T 1.1:1 01100 0.100 FZPC MAX5491NA01500-T 1.5:1 01500 0.035 FZOX MAX5491NB01500-T 1.5:1 01500 0.050 FZOY MAX5491NC01500-T 1.5:1 01500 0.100 FZOZ MAX5491PA02000-T 2:1 02000 0.035 FZOO MAX5491PB02000-T 2:1 02000 0.050 FZOP MAX5491PC02000-T 2:1 02000 0.100 FZOQ MAX5491RA02500-T 2.5:1 02500 0.035 FZPP PART _______________________________________________________________________________________ 5 MAX5491 How to Order MAX5491 Precision-Matched Resistor-Divider in SOT23 Table 1. Standard Ratios* (continued) PART RESISTOR RATIO RESISTOR-RATIO SUFFIX RESISTOR-RATIO ACCURACY (% MAX) TOP MARK 2.5:1 02500 0.050 FZPQ MAX5491RB02500-T MAX5491RC02500-T 2.5:1 02500 0.100 FZON MAX5491SA03200-T 3.2:1 03200 0.035 FZOU MAX5491SB03200-T 3.2:1 03200 0.050 FZOV MAX5491SC03200-T 3.2:1 03200 0.100 FZOW MAX5491TA05000-T 5:1 05000 0.035 FZOR MAX5491TB05000-T 5:1 05000 0.050 FZOS MAX5491TC05000-T 5:1 05000 0.100 FZOT MAX5491UA07538-T 7.538:1 07538 0.035 FZPM MAX5491UB07538-T 7.538:1 07538 0.050 FZPN MAX5491UC07538-T 7.538:1 07538 0.100 FZPO MAX5491VA10000-T 10:1 10000 0.035 FZPJ MAX5491VB10000-T 10:1 10000 0.050 FZPK MAX5491VC10000-T 10:1 10000 0.100 FZPL MAX5491WA30000-T 30:1 30000 0.035 FZPG MAX5491WB30000-T 30:1 30000 0.050 FZPH MAX5491WC30000-T 30:1 30000 0.100 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 6 Chip Information RESISTOR-RATIO RANGE L 1.000 to 1.099 M 1.100 to 1.349 N 1.350 to 1.699 P 1.700 to 2.000 R 2.001 to 2.899 S 2.900 to 3.999 T 4.000 to 5.999 U 6.000 to 9.999 V 10.000 to 15.999 W 16.000 to 30.000 TRANSISTOR COUNT: 0 PROCESS: BiCMOS _______________________________________________________________________________________ Precision-Matched Resistor-Divider in SOT23 SOT23 L.EPS 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 7 © 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. MAX5491 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.)