19-2222; Rev 1; 1/02 ±15V Digitally Programmable Precision Voltage-Dividers for PGAs Features ♦ Four Noninverting PGA Gain Configurations: AV = 1, 2, 4, and 8 ♦ Precision 0.025% Ratio Accuracy ♦ On-Chip Matching Resistor for Op Amp BiasCurrent Compensation (MAX5431) ♦ Single-Supply 12V to 15V, or Dual-Supply ±12V to ±15V Operation ♦ Low 35µA Supply Current ♦ CMOS/TTL Logic Compatible 2-Wire Parallel Interface ♦ Space-Saving 8-Pin SOT23 and 10-Pin µMAX Packages ♦ 3V Logic Compatibility Applications General-Purpose Programmable Noninverting Amplifier Programmable Instrumentation Amplifier Ordering Information TEMP RANGE PART MAX5430AEKA -40°C to +85°C 8 SOT23 0.025% MAX5430BEKA -40°C to +85°C 8 SOT23 0.09% MAX5430CEKA -40°C to +85°C 8 SOT23 0.5% MAX5431AEUB -40°C to +85°C 10 µMAX 0.025% MAX5431BEUB -40°C to +85°C 10 µMAX 0.09% MAX5431CEUB -40°C to +85°C 10 µMAX 0.5% Pin Configurations Functional Diagram VDD PINGAIN PACKAGE ACCURACY H TOP VIEW MAX5430 MAX5431 10 D0 VDD 1 W D0 MATCH_H 2 MAX5431 GND 3 DECODER 9 D1 8 W D1 H 4 7 VSS MATCH_H L 5 6 MATCH_L MATCH_L µMAX VSS GND L MAX5431 ONLY Pin Configurations continued at end of data sheet. ________________________________________________________________ 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 MAX5430/MAX5431 General Description The MAX5430/MAX5431 are digitally programmable high-precision resistor arrays for PGAs. The MAX5430/ MAX5431 operate from a single 15V supply or dual ±15V supplies, and consume only 35µA supply current. These devices are intended for programmable-gain amplifier (PGA) applications and consist of fixed resistor-dividers. Each device has digitally controlled contacts with four precision noninverting gains of 1, 2, 4, and 8 with ratio accuracy of 0.025% (MAX5430A/ MAX5431A), 0.09% (MAX5430B/MAX5431B), or 0.5% (MAX5430C/MAX5431C). The MAX5431 includes an on-chip matching resistor for op amp input bias-current compensation. The MAX5430/MAX5431 are available in space-saving 8-pin SOT23 and 10-pin µMAX packages, and specified over the extended temperature range of (-40°C to +85°C). MAX5430/MAX5431 ±15V Digitally Programmable Precision Voltage-Dividers for PGAs ABSOLUTE MAXIMUM RATINGS VDD to GND ............................................................-0.3V to +17V VSS to GND.............................................................-17V to +0.3V D0, D1 to GND .........................................................-0.3V to +6V H, L, W, MATCH_ to GND ................(VSS - 0.3V) to (VDD + 0.3V) Current Into Any Signal Pin...............................................±50mA Continuous Power Dissipation (TA = +70°C) 8-Pin SOT23 (derate 8.9mW/°C above +70°C)............714mW 10-Pin µMAX (derate 10.3mW/°C above +70°C) .........825mW Operating Temperature Range ...........................-40°C to +85°C Storage Temperature Range .............................-60°C to +150°C Junction Temperature ......................................................+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. ELECTRICAL CHARACTERISTICS (VDD = +15V, VSS = -15V, GND = 0, TA = TMIN to TMAX. Typical values are at TA = +25°C, unless otherwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC PERFORMANCE Divider Ratio Accuracy (Note 2) VH = +5V, VL = -5V Resistance between H and L (Figure 1) RHL Capacitance at Analog Pins CANALOG Matching Resistor W, H, L, MATCH_H, MATCH _L Voltage Range MAX5431 only MAX543_A 0.025 MAX543_B 0.09 MAX543_C 0.5 Ratio = 1 Ratio = 2, 4, 8 VANALOG VSS Input High Voltage VIH 2.4 Input Low Voltage VIL % 57 kΩ 2 pF 0.5 14 kΩ VDD V DIGITAL INPUTS Input Leakage Current Input Capacitance V D0, D1 = 5V or GND CIN 0.8 V ±1 µA 5 pF POWER REQUIREMENTS Negative Supply Current ISS 1 25 µA Positive Supply Current IDD 35 60 µA Positive Power-Supply Voltage VDD 10.8 15.75 V Negative Power-Supply Voltage VSS -15.75 0 V DYNAMIC PERFORMANCE Switching Time tD2W, tH2W 0.3 µs Note 1: All devices are 100% production tested at TA = +25°C. SOT23 packages are guaranteed by design from TA = TMIN to TMAX. Note 2: Gain accuracy is measured without load at pin W. 2 _______________________________________________________________________________________ ±15V Digitally Programmable Precision Voltage-Dividers for PGAs MAX543_A DIVIDER RATIO ACCURACY vs. TEMPERATURE (RATIO = 2) 0.0005 0 -0.0005 -0.0010 0.004 0.002 0 -0.002 -0.004 -0.006 -0.0015 -0.008 -0.0020 -0.010 20 35 50 65 MAX543_A DIVIDER RATIO ACCURACY vs. TEMPERATURE (RATIO = 8) 20 35 50 65 0.004 0.002 0 -0.002 -0.004 -0.006 0.0015 65 0.0005 0 -0.0005 -0.0010 -25 -10 5 20 35 50 65 0.006 0.004 0.002 0 -0.002 -0.004 -0.006 -0.008 5 20 35 50 TEMPERATURE (°C) MAX5430 toc03 0 -0.005 -0.010 65 80 0.008 0.006 0.004 0.002 0 -0.002 -0.004 -0.006 -0.010 -40 -25 -10 5 20 35 50 65 80 TEMPERATURE (°C) -0.008 -25 -10 80 0.005 -0.020 -40 -25 -10 80 0.010 DIVIDER RATIO ACCURACY (%) 0.008 65 0.010 MAX543_A DIVIDER RATIO ACCURACY vs. POSITIVE SUPPLY (VSS = -15V) MAX543_B DIVIDER RATIO ACCURACY vs. TEMPERATURE (RATIO = 8) MAX5430 toc07 0.010 50 0.015 TEMPERATURE (°C) MAX543_B DIVIDER RATIO ACCURACY vs.TEMPERATURE (RATIO = 4) 35 -0.015 -0.0020 -40 80 20 0.020 0.010 0.008 DIVIDER RATIO ACCURACY (%) 50 5 MAX543_B DIVIDER RATIO ACCURACY vs. TEMPERATURE (RATIO = 2) 0.0010 TEMPERATURE (°C) -0.010 -40 -0.006 TEMPERATURE (°C) -0.0015 35 -0.004 -0.010 -40 -25 -10 80 MAX5430 toc05 0.006 -0.008 DIVIDER RATIO ACCURACY (%) 5 0.0020 DIVIDER RATIO ACCURACY (%) DIVIDER RATIO ACCURACY (%) 0.008 20 0 -0.002 MAX543_B DIVIDER RATIO ACCURACY vs. TEMPERATURE (RATIO = 1) MAX5430 toc04 0.010 5 0.002 TEMPERATURE (°C) TEMPERATURE (°C) -0.010 -40 -25 -10 0.004 -0.008 -40 -25 -10 80 0.006 MAX5430 toc06 5 0.008 DIVIDER RATIO ACCURACY (%) -40 -25 -10 MAX5430 toc02 0.006 0.010 MAX5430 toc09 0.0010 0.008 MAX5430 toc08 DIVIDER RATIO ACCURACY (%) 0.0015 0.010 DIVIDER RATIO ACCURACY (%) MAX5430 toc01 0.0020 MAX543_A DIVIDER RATIO ACCURACY vs. TEMPERATURE (RATIO = 4) DIVIDER RATIO ACCURACY (%) MAX543_A DIVIDER RATIO ACCURACY vs. TEMPERATURE (RATIO = 1) RATIO 2 0.006 0.004 0.002 RATIO 1 0 -0.002 -0.004 RATIO 4 RATIO 8 -0.006 -0.008 -0.010 5 20 35 TEMPERATURE (°C) 50 65 80 11 12 13 14 15 POSITIVE SUPPLY (V) _______________________________________________________________________________________ 3 MAX5430/MAX5431 Typical Operating Characteristics (VDD = +15V, VSS = -15V or VSS = GND, VH = 5V, VL =-5V, TA = 25°C, unless otherwise noted.) (Note 3) Typical Operating Characteristics (continued) (VDD = +15V, VSS = -15V or VSS = GND, VH = 5V, VL =-5V, TA = 25°C, unless otherwise noted.) (Note 3) 0.004 0.002 0 RATIO 8 -0.002 RATIO 1 -0.004 -0.006 -0.008 RATIO 2 0.006 0.004 RATIO 1 0.002 RATIO 4 0 -0.002 -0.004 RATIO 8 -0.006 12 13 14 15 RATIO 2 0.006 RATIO 4 0.004 0.002 0 -0.002 RATIO 8 RATIO 1 -0.004 -0.006 -0.010 -0.010 11 VL = 0 0.008 -0.008 -0.008 -0.010 0.010 11 12 13 14 11 15 12 13 14 POSITIVE SUPPLY (V) POSITIVE SUPPLY (V) MAX543_A DIVIDER RATIO ACCURACY vs. NEGATIVE SUPPLY MAX543_B DIVIDER RATIO ACCURACY vs. NEGATIVE SUPPLY SUPPLY CURRENT vs. TEMPERATURE 0.006 RATIO 2 0.004 0.002 RATIO 1 RATIO 4 0 -0.002 -0.004 RATIO 8 -0.006 -0.008 0.010 0.008 0.006 RATIO 4 0.004 RATIO 2 0.002 0 -0.002 RATIO 8 RATIO 1 -0.004 -0.006 15 30 D0, D1 = 5V 25 SUPPLY CURRENT (µA) VL = 0 0.008 DIVIDER RATIO ACCURACY (%) MAX5430 toc13 POSITIVE SUPPLY (V) 0.010 MAX5430 toc12 VL = 0 0.008 DIVIDER RATIO ACCURACY (%) RATIO 4 MAX5430 toc11 RATIO 2 0.006 0.010 MAX5430 toc14 DIVIDER RATIO ACCURACY (%) 0.008 DIVIDER RATIO ACCURACY (%) MAX5430 toc10 0.010 MAX543_B DIVIDER RATIO ACCURACY vs. POSITIVE SUPPLY (VSS = 0V) MAX543_A DIVIDER RATIO ACCURACY vs. POSITIVE SUPPLY (VSS = 0V) MAX5430 toc15 MAX543_B DIVIDER RATIO ACCURACY vs. POSITIVE SUPPLY (VSS = -15V) DIVIDER RATIO ACCURACY (%) MAX5430/MAX5431 ±15V Digitally Programmable Precision Voltage-Dividers for PGAs 20 15 10 D0, D1 = 0V 5 -0.008 -0.010 -0.010 -15 -12 -9 -6 NEGATIVE SUPPLY (V) -3 0 0 -15 -12 -9 -6 NEGATIVE SUPPLY (V) -3 0 -40 -25 -10 5 20 35 50 65 80 TEMPERATURE (°C) Note 3: For MAX543_C accuracy Typical Operating Characteristics, refer to MAX543_B accuracy Typical Operating Characteristics. 4 _______________________________________________________________________________________ ±15V Digitally Programmable Precision Voltage-Dividers for PGAs PIN NAME MAX5431 FUNCTION MAX5430 1 8 VDD 2 — MATCH_H Positive Power Supply 3 7 GND 4 6 H High Terminal of Resistive-Divider 5 5 L Low Terminal of Resistive-Divider 6 — MATCH_L 7 4 VSS 8 3 W Wiper Terminal of Resistive-Divider Matching Resistor High Terminal Ground Matching Resistor Low Terminal Negative Power Supply 9 2 D1 Second Bit Digital Input (MSB) (Table 1) 10 1 D0 First Bit Digital Input (LSB) (Table 1) (MAX5430A/MAX5431A), 0.09% (MAX5430B/MAX5431B), or 0.5% (MAX5430C/MAX5431C). H The end-to-end resistance from H to L is 57kΩ. The impedance seen at W is designed to be the same 14kΩ for gain settings 2, 4, and 8, ensuring excellent op amp input-resistance balance, regardless of gain setting (MAX5431 only). In a gain of 1 configuration, H is internally connected to W with a typical resistance of 500Ω. RATIO = 1 4R RATIO = 2 2R Matching Resistor (MAX5431) W RATIO = 4 R The MAX5431 includes a matching resistor to compensate the offset voltage due to the input bias current of the op amp. The resistance from MATCH_H to MATCH_L is a fixed matching resistor, equal to the resistance seen at W for gains of 2, 4, and 8. In the gain of 1, an internal switch short circuits MATCH_H and MATCH_L. This internal switch matches the impedance of the switch between H and W. RATIO = 8 R Table 1. Logic-Control Truth Table L DIGITAL INPUTS Figure 1. Simplified Functional Diagram Detailed Description The MAX5430/MAX5431 are digitally programmable precision resistor arrays. These devices have fixed resistordividers with digitally controlled contacts, providing four precision noninverting gains of 1, 2, 4, and 8 for PGA applications (see Functional Diagram and Figure 1). The MAX5430/MAX5431 achieve ratio accuracies of 0.025% GAIN D1 D0 0 0 1 0 1 2 1 0 4 1 1 8 _______________________________________________________________________________________ 5 MAX5430/MAX5431 Pin Description MAX5430/MAX5431 ±15V Digitally Programmable Precision Voltage-Dividers for PGAs Digital Interface Operation The MAX5430/MAX5431 feature a simple two-bit parallel programming interface. D1 and D0 program the gain setting according to the Logic-Control Truth Table (see Table 1). The digital interface is CMOS/TTL logic compatible. Applications Information 15V VIN VOUT 15V VDD Programmable-Gain Amplifier The MAX5430/MAX5431 are ideally suited for high-precision PGA applications. The typical application circuit of Figure 2 uses the MAX5431 with matching resistor to compensate for voltage offset due to op amp input bias currents. Use the MAX5430 with an ultra-low input bias current op amp (see Figure 3). W H MAX5430 VSS L GND Power Supplies and Bypassing The MAX5430/MAX5431 operate from dual ±15V supplies or a single 15V supply. For dual supplies, bypass VDD and VSS with 0.1µF ceramic capacitors to GND. For single supply, connect VSS to GND and bypass VDD with a 0.1µF ceramic capacitor to GND. Figure 3. Programmable-Gain Amplifier Using the MAX5430 Pin Configurations (continued) Switching Time and Layout Concerns The switching time of the MAX5430/MAX5431 depends on the capacitive loading at W. For best performance, reduce parasitic board capacitance by minimizing the circuit board trace from W to the op amp inverting input, and choose an op amp with low input capacitance. TOP VIEW 8 VDD D0 1 D1 2 MAX5430 W 3 VSS 4 7 GND 6 H 5 L SOT23 Chip Information 15V TRANSISTOR COUNT: 121 PROCESS: CMOS 15V VDD MATCH_H VIN MATCH_L VOUT MAX5431 W H VSS L GND Figure 2. MAX5431 Typical Application Circuit 6 _______________________________________________________________________________________ ±15V Digitally Programmable Precision Voltage-Dividers for PGAs SOT23, 8L.EPS 10LUMAX.EPS 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 © 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. MAX5430/MAX5431 Package Information