100kΩ Precision-Matched Resistor-Divider in SOT23

Transcription

1 ; Rev 2; 3/5 1kΩ Precision-Matched Resistor-Divider in General Description The 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.35% (A grade),.5% (B grade), and.1% (C grade). The provides an extremely low resistance-ratio temperature drift of 1ppm/ C (typ) over -55 C to +125 C, and has an end-toend resistance of 1kΩ. Resistance ratios from 1:1 to 1:1 are available. Five standard ratios are available (see Table 1), and custom ratios are also available upon request. The is ideal for precision gain-setting applications where tight resistance matching and low temperature drift are necessary. The is available in a space-saving 3-pin package, and is guaranteed over the military -55 C to +125 C temperature range. Features Resistance Ratios from 1:1 to 1:1 Custom Ratios Available Upon Request Tight Initial Ratio Accuracy.35% (A).5% (B).1% (C) Low 1ppm/ C (typ) Resistor-Ratio-Drift Up to 8V Operating Voltage Across Sum of R1 and Tiny 3-Pin Package Industrial Process Control Instrumentation Precision Gain Setting Medical Equipment Automatic Test Equipment Base Stations Applications PA R T Ordering Information* T EM P R A N G E PIN - PA C K A G E *See the How to Order section for more details. R A T IO A C C U R A C Y (%) M AX 549_A _ - T - 55 C to C 3 S O T M AX 549_B _ - T - 55 C to C 3 S O T M AX 549_C _ - T - 55 C to C 3 S O T Block Diagram Pin Configuration TOP VIEW R R 2 2 Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at , or visit Maxim s website at

2 ABSOLUTE MAXIMUM RATINGS Voltage Between and...1v Maximum Current into Any Pin...±1.mA Continuous Power Dissipation (T A = +7 C) 3-Pin (derate 7.1mW/ C above +7 C) mW 3-Pin (θ J-A ) C/W 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 (T A = -55 C to +125 C, unless otherwise noted. Typical values are at T A = +25 C.) (Note 1) Operating Temperature Range C to +125 C Junction Temperature C Storage Temperature Range C to +15 C Lead Temperature (soldering, 1s)...+3 C PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Initial Resistor Ratio Error (Note 2) _A, T A = +25 C ±.35 _B, T A = +25 C ±.5 _C, T A = +25 C ±.1 Resistance-Ratio Temperature 1:1 ratio 1:1 1 2 Coefficient (Note 3) 1:1 ratio 25:1 2 4 Absolute Temperature Coefficient of Resistance % ppm/ C TCR (Note 4) 35 ppm/ C Voltage Coefficient of Resistance VCR (Note 5).1 ppm/v End-to-End Resistance (R 1 + R 2 ) T A = +25 C kω Continuous Working Voltage Between and V V Continuous Current I R1, I 84 µa,, Capacitance 2 pf Maximum Power Rating 67.2 mw Resistance Ratio Long-Term Stability 2 hours at +7 C ±.3 % -3dB Bandwidth f 3dB 1:1 ratio (Note 6) 3 MHz Thermal Noise 45 µv RMS Current Noise In accordance with MIL-STD-22 method 3B -25 db Note 1: The is 1% production tested at T A = +25 C. Specifications over -55 C to +125 C are guaranteed by design and characterization. Note 2: Testing conditions: T A = +25 C, V - = 1V and 8V. R 1 Note 3: Resistance-ratio temperature coefficient is defined as R 2 and is guaranteed by design, not production tested. R1 For ratios from 25:1 to 1:1, contact factory. T Note 4: Absolute TCR is defined as ( ) ( ) R1 + and is tested at 1V and 8V. R1 + T 2

3 DC ELECTRICAL CHARACTERISTICS (continued) (T A = -55 C to +125 C, unless otherwise noted. Typical values are at T A = +25 C.) (Note 1) Note 5: Resistance-ratio voltage coefficient is defined as Note 6: Calculate bandwidth by using R 1 R 2 R1 V 1 2πRC, where C = C and R and is guaranteed by design, not production tested. R R = 1 2. R1+ (V - = 1V, T A = +25 C, unless otherwise noted.) Typical Operating Characteristics RATIO DRIFT (ppm) NORMALIZED RESISTANCE-RATIO DRIFT vs. TEMPERATURE V - = 1V RATIO 1:1 toc1 RATIO DRIFT (ppm) NORMALIZED RESISTANCE-RATIO DRIFT vs. TEMPERATURE V - = 1V RATIO 1:1 toc2 RATIO DRIFT (ppm) NORMALIZED RESISTANCE-RATIO DRIFT vs. TEMPERATURE V - = 1V RATIO 25:1 toc TEMPERATURE ( C) TEMPERATURE ( C) TEMPERATURE ( C) RATIO ACCURACY (%) RESISTANCE-RATIO ACCURACY vs. VOLTAGE RATIO 25:1 toc4 RESPONSE (db) :1 RATIO C L = 1pF FREQUENCY RESPONSE toc VOLTAGE (V) FREQUENCY (khz) 3

4 Typical Operating Characteristics (continued) (V - = 1V, T A = +25 C, unless otherwise noted.) NOISE (nv/ Hz) 1 1 SPECTRAL NOISE DENSITY RATIO 1:1 SIGNAL CONNECTED TO GROUNDED V - = 2V V - = 1V toc6 THD+N (%) TOTAL HARMONIC DISTORTION PLUS NOISE RESPONSE 1:1 RATIO 2Hz TO 2kHz BANDPASS toc k FREQUENCY (Hz) k 1k 1k FREQUENCY (Hz) Pin Description PIN NAME FUNCTION 1 R 1 Connection Terminal 2 R 2 Connection Terminal 3 Set-Point Connection Terminal Detailed Description As shown in the Block Diagram, the consists of two precision, low-ratio-drift resistors with an end-toend resistance of 1kΩ (R 1 + R 2 ). is the set point of the divider. The maximum working voltage of the is 8V. This device offers a wide range of resistance ratios (R1/) from 1:1 to 1:1 and is ideal for precision operational amplifier gain/attenuation control. A maximum initial ratio accuracy of.35% and a low 1ppm/ C ratio drift enhance system accuracy. Applications Information Self-Heating and Error Applying a voltage across terminals and 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 R 2 2 8V 1kΩ = ( ) = ( ) = 64mW The thermal resistance from junction to ambient, θ J-A, for a 3-pin package is 141 C/W. Calculate the resulting temperature rise as: T = 64mW x 141 C/W = 9.2 C If the ratio temperature coefficient is 1ppm/ C (typ), the total error introduced by self-heating is: 9.2 C x 1ppm/ C = 9.2ppm 4

5 A V R = OUT = 1 VIN OUT IN Typical Applications A = VOUT R = VIN OUT IN R 2 R 1 R 2 R 1 Figure 1. Inverting Amplifier Configuration Figure 2. Noninverting Amplifier Configuration IN IN A V = OUT = VIN R1 + A V = OUT = VIN R1 + R 1 R 1 OUT R 2 OUT R 2 Figure 3. Buffered Attenuator Figure 4. Attenuator with Buffer 5

6 PREFIX MAX 549 V A 1 -T ROOT PART NUMBER = 1kΩ end-to-end RATIO RANGE L through W. Resistor ratio must fall in the appropriate ratio range. (See Table 2.) RATIO ACCURACY A =.35% (max); B =.5% (max); C =.1% (max) How to Order RESISTANCE RATIO Five number ratio designator. Ratios available from 1:1 to 1:1. Format examples: 1 = 1:1 25 = 2.5: = 7.538:1 = 1:1 TAPE AND REEL Example Part Numbers PART NUMBER RESISTOR-RATIO RANGE RESISTOR-RATIO ACCURACY (% MAX) RESISTOR RATIO PA25-T 2. to :1 RB3-T 3. to :1 UA7538-T to :1 VC1-T 1. to :1 6

7 Table 1. Standard Ratios* PART NUMBER RESISTOR RATIO RESISTOR-RATIO SUFFIX RESISTOR-RATIO ACCURACY (% MAX) TOP MARK GA1-T 1: FZQG GB1-T 1:1 1.5 FZQH GC1-T 1:1 1.1 FZQI MA2-T 2: FZRQ MB2-T 2:1 2.5 FZRR MC2-T 2:1 2.1 FZRS TA5-T 5: FZQJ TB5-T 5:1 5.5 FZQK TC5-T 5:1 5.1 FZQL VA1-T 1: FZQP VB1-T 1:1 1.5 FZQQ VC1-T 1:1 1.1 FZQR XA25-T 25: FZQV XB25-T 25: FZQW XC25-T 25: FZQX *Standard ratios are available for ordering in any quantity. Nonstandard ratios are also available for values between 1:1 to 1:1. A minimum order quantity of 1, units is required for nonstandard ratios. Please contact factory for more information. Table 2. Ratio Ranges LETTER SUFFIX RESISTOR-RATIO RANGE G 1. to 1.99 H 1.1 to J 1.2 to K 1.4 to L 1.6 to M 1.9 to 2.99 N 2.1 to P 2.5 to R 3. to S 3.5 to T 4.5 to U 6. to V 9. to W 14. to X 25. to Y 5. to Z 75. to 1. TRANSISTOR COUNT: PROCESS: BiCMOS Chip Information 7

8 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 L.EPS PACKAGE OUTLINE, 3L SOT 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, 12 San Gabriel Drive, Sunnyvale, CA Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.