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| Low Power, Precision Auto-Zero Op Amp AD8538 FEATURES Low offset voltage: 13 V maximum Input offset drift: 0.03 V/C Single-supply operation: 2.7 V to 5.5 V High gain, CMRR, and PSRR Low input bias current: 25 pA Low supply current: 180 A PIN CONFIGURATION DIAGRAMS OUT V- +IN 1 5 V+ AD8538 2 3 4 -IN Figure 1. 5-Lead TSOT-23 (UJ-5) APPLICATIONS Mobile communications Portable instrumentation Battery-powered devices Sensor interfaces Temperature measurement Electronic scales NC 1 8 NC V+ -IN 2 +IN 3 V- AD8538 7 NC = NO CONNECT Figure 2. 8-Lead SOIC_N (R-8) GENERAL DESCRIPTION The AD8538 is a very high precision amplifier featuring extremely low offset voltage, low input bias current, and low power consumption. The supply current is less than 180 A at 5.0 V. Operation is fully specified from 2.7 V to 5.0 V single supply (1.35 V to 2.5 V dual supply). The AD8538 operates using very low power making this amplifier ideal for battery-powered devices and portable equipment. The AD8538 is specified over the extended industrial temperature range (-40C to +125C). The AD8538 amplifier is available in 5-lead TSOT-23, and 8-lead, narrow body SOIC packages. Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 (c) 2005 Analog Devices, Inc. All rights reserved. 05624-001 6 OUT TOP VIEW 4 (Not to Scale) 5 NC 05624-002 TOP VIEW (Not to Scale) AD8538 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Pin Configuration Diagrams........................................................... 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Electrical Specifications............................................................... 3 Absolute Maximum Ratings ............................................................5 Thermal Resistance .......................................................................5 ESD Caution...................................................................................5 Typical Performance Characteristics ..............................................6 Outline Dimensions ....................................................................... 12 Ordering Guide .......................................................................... 12 REVISION HISTORY 10/05--Revision 0: Initial Version Rev. 0 | Page 2 of 12 AD8538 SPECIFICATIONS ELECTRICAL SPECIFICATIONS @VS = 5.0 V, VCM = 2.5 V, VO = 2.5 V, TA = 25C, unless otherwise specified. Table 1. Parameter INPUT CHARACTERISTICS Offset Voltage Input Bias Current Symbol VOS -40C TA +125C IB -40C TA +85C -40C TA +125C Input Offset Current Input Voltage Range Common-Mode Rejection Ratio Large Signal Voltage Gain Offset Voltage Drift OUTPUT CHARACTERISTICS Output Voltage High IOS -40C TA +125C CMRR AVO VOS/T VOH VCM = 0 V to 5 V -40C TA +125C; VCM = 0.2 V to 4.8 V RL = 10 k, VO = 0.1 V to 4.9 V -40C TA +125C -40C TA +125C RL = 100 k to ground -40C TA +125C RL = 10 k to ground -40C TA +125C RL = 100 k to V+ -40C TA +125C RL = 10 k to V+ -40C TA +125C 0 115 100 115 110 150 135 141 135 0.03 4.998 4.970 1.9 2.8 17 20 25 105 100 125 125 150 190 0.4 10 0.05 600 65 2.0 50 5 7 20 30 15 35 0.7 20 Conditions Min Typ 5 Max 13 30 25 100 1.0 50 150 5 Unit V V pA pA nA pA pA V dB dB dB dB V/C V V V V mV mV mV mV mA dB dB A A V/s s ms kHz Degrees V p-p nV/Hz 0.1 4.99 4.98 4.95 4.94 Output Voltage Low VOL Short-Circuit Limit POWER SUPPLY Power Supply Rejection Ratio Supply Current/Amplifier DYNAMIC PERFORMANCE Slew Rate Settling Time 0.01% Overload Recovery Time Gain Bandwidth Product Phase Margin NOISE PERFORMANCE Voltage Noise Voltage Noise Density ISC PSRR ISY VS = 2.7 V to 5.0 V -40C TA +125C IO = 0 -40C TA +125C RL =10 k G = 1, 2 V step, CL = 20 pF, RL = 1 k 180 215 SR tS GBP OO en p-p en RL = 10 k, RL = 100 k, CL = 20 pF f = 0.1 Hz to 10 Hz f = 1 kHz Rev. 0 | Page 3 of 12 AD8538 @ VS = 2.7 V, VCM = 1.35 V, VO = 1.35 V, TA = 25C, unless otherwise specified. Table 2. Parameter INPUT CHARACTERISTICS Offset Voltage Input Bias Current Symbol VOS -40C TA +125C IB -40C TA +85C -40C TA +125C Input Offset Current Input Voltage Range Common-Mode Rejection Ratio Large Signal Voltage Gain Offset Voltage Drift OUTPUT CHARACTERISTICS Output Voltage High IOS -40C TA +125C CMRR AVO VOS/T VOH VCM = 0 V to 2.5 V -40C TA +125C RL = 10 k, VO = 0.1 V to 1.7 V -40C TA +125C -40C TA +125C RL = 100 k to ground -40C TA +125C RL = 10 k to ground -40C TA +125C RL = 100 k to V+ -40C TA +125C RL = 10 k to V+ -40C TA +125C 0 110 100 110 105 140 135 140 135 0.03 2.698 2.68 1.7 2.4 14 20 8 105 100 125 125 150 190 0.4 5 0.05 600 65 2.0 50 5 5 20 25 15 35 0.7 20 Conditions Min Typ 5 Max 13 30 25 100 1.0 50 150 2.7 Unit V V pA pA nA pA pA V dB dB dB dB V/C V V V V mV mV mV mV mA dB dB A A V/s s ms kHz Degrees V p-p nV/Hz 0.1 2.68 2.68 2.67 2.66 Output Voltage Low VOL Short-Circuit Limit POWER SUPPLY Power Supply Rejection Ratio Supply Current/Amplifier DYNAMIC PERFORMANCE Slew Rate Settling Time 0.01% Overload Recovery Time Gain Bandwidth Product Phase Margin NOISE PERFORMANCE Voltage Noise Voltage Noise Density ISC PSRR ISY VS = 2.7 V to 5.5 V -40C TA +125C IO = 0 -40C TA +125C RL = 10 k G = 1, 1 V step, CL = 20 pF, RL = 1 k 180 215 SR tS GBP OO en p-p en RL = 10 k, RL = 100 k, CL = 20 pF f = 0.1 Hz to 10 Hz f = 1 kHz Rev. 0 | Page 4 of 12 AD8538 ABSOLUTE MAXIMUM RATINGS TA = 25C, unless otherwise noted. Table 3. Parameter Supply Voltage Input Voltage Differential Input Voltage Output Short-Circuit Duration to GND Storage Temperature Range Lead Temperature (Soldering, 60 sec) Operating Temperature Range Junction Temperature Range Rating +6 V VSS - 0.3 V to VDD + 0.3 V 6 V Observe derating curve -65C to +150C 300C -40C to +125C -65C to +150C Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Absolute maximum ratings apply at 25C, unless otherwise noted. THERMAL RESISTANCE JA is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages. Table 4. Thermal Characteristics Package Type 5-Lead TSOT-23 (UJ-5) 8-Lead SOIC_N (R-8) JA 207 158 JC 61 43 Unit C/W C/W ESD CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although this product features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality. Rev. 0 | Page 5 of 12 AD8538 TYPICAL PERFORMANCE CHARACTERISTICS VSY = 5 V or 2.5 V, unless otherwise noted. 450 400 350 300 250 200 150 100 05624-003 VSY = 5V 0V < VCM < 5V TA = 25C INPUT BIAS CURRENT (pA) 700 600 500 400 300 200 100 0 25 VSY = 5V AND 2.7V NUMBER OF AMPLIFIERS 0 -10.0 -8.4 -6.8 -5.2 -3.6 -2.0 -0.4 1.2 2.8 4.4 6.0 7.6 9.2 INPUT OFFSET VOLTAGE (V) 45 65 85 105 125 TEMPERATURE (C) Figure 3. Input Offset Voltage Distribution 14 12 NUMBER OF AMPLIFIERS 10 8 6 4 2 0 SUPPLY CURRENT (A) VSY = 5V -40C < TA < +125C 160 Figure 6. Input Bias Current vs. Temperature TA = 25C 140 120 100 80 60 40 05624-007 05624-004 20 0 0 0.012 0.024 0.036 0.048 0.060 0.072 0.084 TCVOS (V/C) 0.096 0 1 2 3 4 5 SUPPLY VOLTAGE (V) Figure 4. Input Offset Voltage Drift Distribution 10 8 200 Figure 7. Supply Current vs. Supply Voltage VSY = 5V TA = 25C INPUT OFFSET VOLTAGE (V) 6 4 2 0 -2 -4 -6 -8 -10 0 1 2 3 4 5 05624-005 SUPPLY CURRENT (A) 150 VSY = 5V VSY = 2.7V 100 50 05624-008 0 -40 10 60 TEMPERATURE (C) 110 INPUT COMMON-MODE VOLTAGE (V) Figure 5. Input Offset Voltage vs. Input Common-Mode Voltage Figure 8. Supply Current vs. Temperature Rev. 0 | Page 6 of 12 05624-006 50 AD8538 10000 VSY = 5V TA = 25C 70 60 50 135 OUTPUT SATURATION VOLTAGE (mV) 1000 100 VOL 10 SOURCE OPEN-LOOP GAIN (dB) VSY - VOH 40 30 20 M 10 0 90 45 1 SINK 05624-009 0 VSY = 2.5V AND 1.35V RL = 100k CL = 20pF 10k 100k 0.1 -10 -20 1k 0.01 0.1 LOAD CURRENT (mA) 1 10 FREQUENCY (Hz) Figure 9. Output Saturation Voltage vs. Load Current 35 VSY = 5V RL = 10k VSY - VOH 25 20 VOL 15 10 5 0 -40 Figure 12. Open-Loop Gain and Phase vs. Frequency 120 OUTPUT SATURATION VOLTAGE (mV) 30 VSY = 5V AND 2.7V TA = 25C 100 80 CMRR (dB) 60 40 20 05624-010 05624-013 -25 -10 5 20 35 50 65 80 95 110 125 0 100 1k 10k FREQUENCY (Hz) 100k 1M TEMPERATURE (C) Figure 10. Output Saturation Voltage vs. Temperature 60 Figure 13. CMRR vs. Frequency 100 VSY = 5V AND 2.7V CL = 20pF RL = 2k AV = 100 VSY = 2.5V AND 1.35V TA = 25C 80 +PSRR PSRR (dB) CLOSED-LOOP GAIN (dB) 40 60 -PSRR 40 20 AV = 10 0 AV = 1 20 05624-014 05624-011 -20 1k 10k 100k 1M 0 100 1k 10k FREQUENCY (Hz) 100k 1M FREQUENCY (Hz) Figure 11. Closed-Loop Gain vs. Frequency Figure 14. PSRR vs. Frequency Rev. 0 | Page 7 of 12 05624-012 0.01 0.001 -45 1M OPEN-LOOP PHASE SHIFT (Degrees) AD8538 1000 VSY = 5V AND 2.7V AV = 100 VSY = 5V AV = 1 CL = 300pF RL = 10k 100 OUTPUT IMPEDANCE () 10 AV = 10 1 AV = 1 0.1 05624-022 VOLTAGE (1V/DIV) 0.01 100 1k 10k FREQUENCY (Hz) 100k 1M TIME (4s/DIV) Figure 15. Closed-Loop Output Impedance vs. Frequency 60 Figure 18. Large Signal Transient Response VSY = 5V AV = -50 SMALL SIGNAL OVERSHOOT (%) 50 40 VIN (mV) VSY = 5V TA = 25C RL = 2k 100 0 30 OS+ 0 VOUT (V) 20 OS- 05624-015 10 05624-017 -2.5 TIME (10s/DIV) 0 1 10 100 1000 LOAD CAPACITANCE (pF) Figure 16. Small Signal Overshoot vs. Load Capacitance VSY = 5V AND 2.7V AV = 1 CL = 300pF RL = 2k Figure 19. Positive Overload Recovery VSY = 5V AV = -50 0 VIN (mV) VOLTAGE (50mV/DIV) -100 2.5 VOUT (V) 05624-016 TIME (4s/DIV) TIME (10s/DIV) Figure 17. Small Signal Transient Response Figure 20. Negative Overload Recovery Rev. 0 | Page 8 of 12 05624-019 0 05624-018 AD8538 1000 VSY = 5V TA = 25C VIN VOLTAGE NOISE DENSITY (nV/Hz) VOLTAGE (1V/DIV) VOUT 100 10 10 100 1k FREQUENCY (Hz) 10k 05624-021 TIME (200s/DIV) Figure 21. Voltage Noise Density VSY = 5V AND 2.7V Figure 23. No Phase Reversal VOLTAGE (500nV/DIV) TIME (1s/DIV) Figure 22. 0.1 Hz to 10 Hz Input Voltage Noise 05624-020 Rev. 0 | Page 9 of 12 05624-023 VSY = 5V AV = 1 VIN = 6V p-p RL = 10k AD8538 VS = 2.7 V or 1.35 V. 180 VSY = 2.7V 0V < VCM < 2.7V 160 T = 25C A 140 NUMBER OF AMPLIFIERS 10000 OUTPUT SATURATION VOLTAGE (mV) VSY = 2.7V TA = 25C 1000 120 100 80 60 40 05624-024 100 10 SOURCE 1 SINK 05624-027 20 0 -10.0 -8.4 -6.8 -5.2 -3.6 -2.0 -0.4 1.2 2.8 4.4 6.0 7.6 9.2 INPUT OFFSET VOLTAGE (V) 0.1 0.001 0.01 0.1 1 LOAD CURRENT (mA) Figure 24. Input Offset Voltage Distribution 35 30 NUMBER OF AMPLIFIERS 25 20 15 10 5 0 Figure 27. Output Saturation Voltage vs. Load Current 30 OUTPUT SATURATION VOLTAGE (mV) VSY = 2.7V -40C < TA < +125C VSY = 2.7V RL = 10k 25 VSY = VOH 20 15 VOL 10 5 05624-028 05624-025 0 0.012 0.024 0.036 0.048 0.060 0.072 0.084 0.096 TCVOS (V/C) 0 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C) Figure 25. Input Offset Voltage Drift Distribution 10 80 Figure 28. Output Saturation Voltage vs. Temperature VSY = 2.7V TA = 25C 70 RL = 2k VSY = 2.7V 8 TA = 25C 6 4 2 0 SMALL SIGNAL OVERSHOOT (%) INPUT OFFSET VOLTAGE (V) 60 50 40 30 20 10 0 OS+ OS- 05624-029 -2 -4 -6 -8 -10 0 0.5 1.0 1.5 2.0 2.5 05624-026 1 10 100 1000 INPUT COMMON-MODE VOLTAGE (V) LOAD CAPACITANCE (pF) Figure 26. Input Offset Voltage vs. Input Common-Mode Voltage Figure 29. Small Signal Overshoot vs. Load Capacitance Rev. 0 | Page 10 of 12 AD8538 VSY = 2.7V AV = 1 CL = 100pF RL = 10k 1000 VSY = 2.7V TA = 25C VOLTAGE NOISE DENSITY (nV/Hz) 05624-030 VOLTAGE (500mV/DIV) 100 TIME (4s/DIV) 10 10 100 1k FREQUENCY (Hz) 10k 100k Figure 30. Large Signal Transient Response Figure 31. Voltage Noise Density Rev. 0 | Page 11 of 12 05624-032 AD8538 OUTLINE DIMENSIONS 2.90 BSC 5.00 (0.1968) 4.80 (0.1890) 4 8 5 5 1.60 BSC 1 2 3 2.80 BSC 4.00 (0.1574) 3.80 (0.1497) 1 6.20 (0.2440) 4 5.80 (0.2284) PIN 1 0.95 BSC *0.90 0.87 0.84 1.90 BSC 0.25 (0.0098) 0.10 (0.0040) 1.27 (0.0500) BSC 1.75 (0.0688) 1.35 (0.0532) 0.50 (0.0196) x 45 0.25 (0.0099) *1.00 MAX 0.20 0.08 8 4 0 0.60 0.45 0.30 0.51 (0.0201) COPLANARITY SEATING 0.31 (0.0122) 0.10 PLANE 8 0.25 (0.0098) 0 1.27 (0.0500) 0.40 (0.0157) 0.17 (0.0067) 0.10 MAX 0.50 0.30 SEATING PLANE COMPLIANT TO JEDEC STANDARDS MS-012-AA CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. *COMPLIANT TO JEDEC STANDARDS MO-193-AB WITH THE EXCEPTION OF PACKAGE HEIGHT AND THICKNESS. Figure 32. 5-Lead Thin Small Outline Transistor Package [TSOT_23] (UJ-5) Dimensions shown in millimeters Figure 33. 8-Lead Standard Small Outline Package [SOIC_N] Narrow Body (R-8) Dimensions shown in millimeters and (inches) ORDERING GUIDE Model AD8538AUJZ-R2 1 AD8538AUJZ-REEL1 AD8538AUJZ-REEL71 AD8538ARZ1 AD8538ARZ-REEL1 AD8538ARZ-REEL71 1 Temperature Range -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C Package Description 5-Lead TSOT-23 5-Lead TSOT-23 5-Lead TSOT-23 8-Lead SOIC_N 8-Lead SOIC_N 8-Lead SOIC_N Package Option UJ-5 UJ-5 UJ-5 R-8 R-8 R-8 Branding AOC AOC AOC Z = Pb-free part. (c) 2005 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D05624-0-10/05(0) T T Rev. 0 | Page 12 of 12 |
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