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| Precision CMOS Single-Supply Rail-to-Rail Input/Output Wideband Operational Amplifiers AD8601/AD8602/AD8604 FEATURES Low Offset Voltage: 500 V Max Single-Supply Operation: 2.7 V to 5.5 V Low Supply Current: 750 A/Amplifier Wide Bandwidth: 8 MHz Slew Rate: 5 V/ s Low Distortion No Phase Reversal Low Input Currents Unity Gain Stable APPLICATIONS Current Sensing Barcode Scanners PA Controls Battery-Powered Instrumentation Multipole Filters Sensors ASIC Input or Output Amplifiers Audio FUNCTIONAL BLOCK DIAGRAM 14-Lead TSSOP (RU Suffix) 5-Lead SOT-23 (RT Suffix) OUT A 1 IN A 2 14 13 12 OUT D IN D IN D V IN C IN C OUT C OUT A 1 V 2 5V AD8601 4 IN IN A 3 V 4 AD8604 11 10 9 8 IN 3 IN B 5 IN B 6 OUT B 7 8-Lead MSOP (RM Suffix) OUT A 1 IN A 2 8 7 14-Lead SOIC (R Suffix) OUT A 1 IN A 2 14 OUT D 13 12 V OUT B IN B IN B AD8602 6 5 4 IN A 3 IN D IN D V GENERAL DESCRIPTION IN A 3 V 4 The AD8601, AD8602, and AD8604 are single, dual, and quad rail-to-rail input and output single-supply amplifiers featuring very low offset voltage and wide signal bandwidth. These amplifiers use a new, patented trimming technique that achieves superior performance without laser trimming. All are fully specified to operate on a 3 V to 5 V single supply. The combination of low offsets, very low input bias currents, and high speed make these amplifiers useful in a wide variety of applications. Filters, integrators, diode amplifiers, shunt current sensors, and high impedance sensors all benefit from the combination of performance features. Audio and other ac applications benefit from the wide bandwidth and low distortion. For the most cost-sensitive applications, the D grades offer this ac performance with lower dc precision at a lower price point. Applications for these amplifiers include audio amplification for portable devices, portable phone headsets, bar code scanners, portable instruments, cellular PA controls, and multipole filters. The ability to swing rail-to-rail at both the input and output enables designers to buffer CMOS ADCs, DACs, ASICs, and other wide output swing devices in single-supply systems. AD8604 11 V 10 9 8 IN B 5 IN B 6 OUT B 7 IN C IN C OUT C 8-Lead SOIC (R Suffix) OUT A 1 IN A 2 IN A 3 V 4 8V AD8602 7 OUT B 6 5 IN B IN B The AD8601, AD8602, and AD8604 are specified over the extended industrial (-40C to +125C) temperature range. The AD8601, single, is available in the tiny 5-lead SOT-23 package. The AD8602, dual, is available in 8-lead MSOP and narrow SOIC surface-mount packages. The AD8604, quad, is available in 14-lead TSSOP and narrow SOIC packages. SOT, MSOP, and TSSOP versions are available in tape and reel only. REV. D 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. 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: 781/326-8703 (c) 2003 Analog Devices, Inc. All rights reserved. AD8601/AD8602/AD8604-SPECIFICATIONS ELECTRICAL CHARACTERISTICS Parameter Symbol INPUT CHARACTERISTICS Offset Voltage (AD8601/AD8602) VOS (VS = 3 V, VCM = VS/2, TA = 25 C, unless otherwise noted.) Conditions 0 V VCM 1.3 V -40C TA +85C -40C TA +125C 0 V VCM 3 V* -40C TA +85C -40C TA +125C VCM = 0 V to 1.3 V -40C TA +85C -40C TA +125C VCM = 0 V to 3.0 V* -40C TA +85C -40C TA +125C -40C TA +85C -40C TA +125C -40C TA +85C -40C TA +125C VCM = 0 V to 3 V VO = 0.5 V to 2.5 V, RL = 2 k , VCM = 0 V 0 68 30 83 100 2 2.95 20 30 12 67 80 680 56 1,000 1,300 35 50 Min A Grade Typ Max 80 500 700 1,100 750 1,800 2,100 600 800 1,600 800 2,200 2,400 60 100 1,000 30 50 500 3 Min D Grade Typ Max 1,100 6,000 7,000 7,000 6,000 7,000 7,000 6,000 7,000 7,000 6,000 7,000 7,000 200 200 1,000 100 100 500 3 Unit V V V V V V V V V V V V pA pA pA pA pA pA V dB V/mV V/C V V mV mV mA 350 1,300 Offset Voltage (AD8604) VOS 80 1,100 350 1,300 Input Bias Current IB Input Offset Current IOS 0.2 25 150 0.1 0.2 25 150 0.1 Input Voltage Range Common-Mode Rejection Ratio Large Signal Voltage Gain Offset Voltage Drift OUTPUT CHARACTERISTICS Output Voltage High Output Voltage Low Output Current Closed-Loop Output Impedance POWER SUPPLY Power Supply Rejection Ratio Supply Current/Amplifier DYNAMIC PERFORMANCE Slew Rate Settling Time Gain Bandwidth Product Phase Margin NOISE PERFORMANCE Voltage Noise Density Current Noise Density CMRR AVO VOS/T VOH VOL IOUT ZOUT PSRR ISY 0 52 20 65 60 2 2.95 20 30 12 72 680 35 50 IL = 1.0 mA -40C TA +125C IL = 1.0 mA -40C TA +125C f = 1 MHz, AV = 1 VS = 2.7 V to 5.5 V VO = 0 V -40C TA +125C RL = 2 k To 0.01% 2.92 2.88 2.92 2.88 dB 1,000 A 1,300 A V/s s MHz Degrees nV/Hz nV/Hz pA/Hz SR tS GBP o en en in 5.2 <0.5 8.2 50 33 18 0.05 5.2 <0.5 8.2 50 33 18 0.05 f = 1 kHz f = 10 kHz *For VCM between 1.3 V and 1.8 V, V OS may exceed specified value. Specifications subject to change without notice. -2- REV. D AD8601/AD8602/AD8604 ELECTRICAL CHARACTERISTICS Parameter Symbol INPUT CHARACTERISTICS Offset Voltage (AD8601/AD8602) VOS Offset Voltage (AD8604) Input Bias Current VOS IB (VS = 5.0 V, VCM = VS/2, TA = 25 C, unless otherwise noted.) Conditions 0 V VCM 5 V -40C TA +125C VCM = 0 V to 5 V -40C TA +125C -40C TA +85C -40C TA +125C -40C TA +85C -40C TA +125C VCM = 0 V to 5 V VO = 0.5 V to 4.5 V, RL = 2 k, VCM = 0 V 0 74 30 0.1 6 25 89 80 Min A Grade Typ Max 80 80 0.2 500 1,300 600 1,700 60 100 1,000 30 50 500 5 Min D Grade Typ Max 1,300 1,300 0.2 6,000 7,000 6,000 7,000 200 200 1,000 100 100 500 5 Unit V V V V pA pA pA pA pA pA V dB V/mV Input Offset Current IOS 0.1 6 25 0 56 20 67 60 Input Voltage Range Common-Mode Rejection Ratio Large Signal Voltage Gain CMRR AVO Offset Voltage Drift OUTPUT CHARACTERISTICS Output Voltage High VOS/T VOH 2 IL = 1.0 mA IL = 10 mA -40C TA +125C IL = 1.0 mA IL = 10 mA -40C TA +125C f = 1 MHz, AV = 1 VS = 2.7 V to 5.5 V VO = 0 V 67 4.925 4.7 4.6 4.975 4.77 15 125 50 10 80 750 56 1,200 30 175 250 4.925 4.7 4.6 2 4.975 4.77 15 125 50 10 72 750 30 175 250 V/C V V V mV mV mV mA Output Voltage Low VOL Output Current Closed-Loop Output Impedance POWER SUPPLY Power Supply Rejection Ratio Supply Current/Amplifier DYNAMIC PERFORMANCE Slew Rate Settling Time Full Power Bandwidth Gain Bandwidth Product IOUT ZOUT PSRR ISY -40C TA +125C 6 <1.0 360 8.4 1,500 6 <1.0 360 8.4 1,500 A V/s s kHz MHz dB 1,200 A SR tS BWp GBP RL = 2 k To 0.01% < 1% Distortion Phase Margin NOISE PERFORMANCE Voltage Noise Density o en en f = 1 kHz f = 10 kHz 55 33 18 55 33 18 Degrees nV/Hz nV/Hz Current Noise Density in f = 1 kHz 0.05 0.05 pA/Hz Specifications subject to change without notice. REV. D -3- AD8601/AD8602/AD8604 ABSOLUTE MAXIMUM RATINGS* Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 V Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND to VS Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . 6 V Storage Temperature Range R, RM, RT, RU Packages . . . . . . . . . . . . -65C to +150C Operating Temperature Range AD8601/AD8602/AD8604 . . . . . . . . . . . . -40C to +125C Junction Temperature Range R, RM, RT, RU Packages . . . . . . . . . . . . -65C to +150C Lead Temperature Range (Soldering, 60 sec) . . . . . . . . 300C ESD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 kV HBM *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 listed in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Package Type 5-Lead SOT-23 (RT) 8-Lead SOIC (R) 8-Lead MSOP (RM) 14-Lead SOIC (R) 14-Lead TSSOP (RU) JA* JC Unit C/W C/W C/W C/W C/W 230 158 210 120 180 92 43 45 36 35 * JA is specified for worst-case conditions, i.e., JA is specified for device in socket for PDIP packages; JA is specified for device soldered onto a circuit board for surface-mount packages. ORDERING GUIDE Model AD8601ART-R2 AD8601ART-REEL AD8601ART-REEL7 AD8601DRT-R2 AD8601DRT-REEL AD8601DRT-REEL7 AD8602AR AD8602AR-REEL7 AD8602AR-R2 AD8602DR AD8602DR-REEL AD8602DR-REEL7 AD8602ARM-R2 AD8602ARM-REEL AD8602DRM-REEL AD8604AR AD8604AR-REEL AD8604AR-REEL7 AD8604DR AD8604DR-REEL AD8604ARU AD8604ARU-REEL AD8604DRU AD8604DRU-REEL Temperature Range -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C Package Description 5-Lead SOT-23 5-Lead SOT-23 5-Lead SOT-23 5-Lead SOT-23 5-Lead SOT-23 5-Lead SOT-23 8-Lead SOIC 8-Lead SOIC 8-Lead SOIC 8-Lead SOIC 8-Lead SOIC 8-Lead SOIC 8-Lead MSOP 8-Lead MSOP 8-Lead MSOP 14-Lead SOIC 14-Lead SOIC 14-Lead SOIC 14-Lead SOIC 14-Lead SOIC 14-Lead TSSOP 14-Lead TSSOP 14-Lead TSSOP 14-Lead TSSOP Package Option RT-5 RT-5 RT-5 RT-5 RT-5 RT-5 R-8 R-8 R-8 R-8 R-8 R-8 RM-8 RM-8 RM-8 R-14 R-14 R-14 R-14 R-14 RU-14 RU-14 RU-14 RU-14 Branding AAA AAA AAA AAD AAD AAD ABA ABA ABD 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 the AD8601/AD8602/AD8604 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. -4- REV. D Typical Performance Characteristics- AD8601/AD8602/AD8604 3,000 VS = 3V TA = 25 C VCM = 0V TO 3V 60 VS = 5V TA = 25 C TO 85 C 50 2,500 QUANTITY - Amplifiers QUANTITY - Amplifiers 2,000 40 1,500 30 1,000 20 500 10 0 1.0 0 0.8 0.6 0 0.4 0.2 0.2 0.4 0.6 INPUT OFFSET VOLTAGE - mV 0.8 1.0 0 1 2 3 4 5 6 TCVOS - V/ C 7 8 9 10 TPC 1. Input Offset Voltage Distribution TPC 4. Input Offset Voltage Drift Distribution 3,000 VS = 5V TA = 25 C VCM = 0V TO 5V 1.5 1.0 VS = 3V TA = 25 C INPUT OFFSET VOLTAGE - mV 2,500 QUANTITY - Amplifiers 0.5 0 0.5 2,000 1,500 1,000 1.0 1.5 2.0 500 0 1.0 0.8 0.6 0 0.4 0.2 0.2 0.4 0.6 INPUT OFFSET VOLTAGE - mV 0.8 1.0 0 0.5 1.0 1.5 2.0 COMMON-MODE VOLTAGE - V 2.5 3.0 TPC 2. Input Offset Voltage Distribution TPC 5. Input Offset Voltage vs. Common-Mode Voltage 60 VS = 3V TA = 25 C TO 85 C 1.5 1.0 VS = 5V TA = 25 C INPUT OFFSET VOLTAGE - mV 50 QUANTITY - Amplifiers 0.5 0 0.5 40 30 20 1.0 1.5 2.0 10 0 0 1 2 3 4 5 6 TCVOS - V/ C 7 8 9 10 0 1 2 3 COMMON-MODE VOLTAGE - V 4 5 TPC 3. Input Offset Voltage Drift Distribution TPC 6. Input Offset Voltage vs. Common-Mode Voltage REV. D -5- AD8601/AD8602/AD8604 300 VS = 3V 30 VS = 3V 200 INPUT OFFSET CURRENT - pA 40 25 10 250 INPUT BIAS CURRENT - pA 25 20 150 15 100 10 50 5 0 5 20 35 50 65 TEMPERATURE - C 80 95 110 125 0 40 25 10 5 20 35 50 65 TEMPERATURE - C 80 95 110 125 TPC 7. Input Bias Current vs. Temperature TPC 10. Input Offset Current vs. Temperature 300 VS = 5V 30 VS = 5V 200 INPUT OFFSET CURRENT - pA 40 25 10 5 20 35 50 65 TEMPERATURE - C 80 95 110 125 250 25 INPUT BIAS CURRENT - pA 20 150 15 100 10 50 5 0 0 40 25 10 5 20 35 50 65 TEMPERATURE - C 80 95 110 125 TPC 8. Input Bias Current vs. Temperature TPC 11. Input Offset Current vs. Temperature 5 VS = 5V TA = 25 C INPUT BIAS CURRENT - pA 10k VS = 2.7V TA = 25 C 1k OUTPUT VOLTAGE - mV 4 3 100 SOURCE SINK 10 2 1 1 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 COMMON-MODE VOLTAGE - V 4.5 5.0 0.1 0.001 0.01 0.1 1 LOAD CURRENT - mA 10 100 TPC 9. Input Bias Current vs. Common-Mode Voltage TPC 12. Output Voltage to Supply Rail vs. Load Current -6- REV. D AD8601/AD8602/AD8604 10k VS = 5V TA = 25 C 1k OUTPUT VOLTAGE - mV 35 VS = 2.7V 30 OUTPUT VOLTAGE - mV 25 VOL @ 1mA LOAD 20 15 10 SOURCE 100 SINK 10 1 5 0.1 0.001 0.01 0.1 1 LOAD CURRENT - mA 10 100 0 40 25 10 5 20 35 50 65 TEMPERATURE - C 80 95 110 125 TPC 13. Output Voltage to Supply Rail vs. Load Current TPC 16. Output Voltage Swing vs. Temperature 5.1 VS = 5V 5.0 2.67 VS = 2.7V 2.66 OUTPUT VOLTAGE - V VOH @ 1mA LOAD OUTPUT VOLTAGE - V 4.9 2.65 VOH @ 1mA LOAD 2.64 4.8 VOH @ 10mA LOAD 4.7 4.6 2.63 4.5 40 25 10 5 20 35 50 65 TEMPERATURE - C 80 95 110 125 2.62 40 25 10 5 20 35 50 65 TEMPERATURE - C 80 95 110 125 TPC 14. Output Voltage Swing vs. Temperature TPC 17. Output Voltage Swing vs. Temperature 250 VS = 5V 200 OUTPUT VOLTAGE - mV 100 80 60 GAIN - dB VS = 3V RL = NO LOAD TA = 25 C PHASE SHIFT - Degrees 45 90 135 180 150 VOL @ 10mA LOAD 40 20 0 -20 100 50 VOL @ 1mA LOAD 0 40 25 10 -40 -60 80 95 110 125 5 20 35 50 65 TEMPERATURE - C 1k 10k 100k 1M FREQUENCY - Hz 10M 100M TPC 15. Output Voltage Swing vs. Temperature TPC 18. Open-Loop Gain and Phase vs. Frequency REV. D -7- AD8601/AD8602/AD8604 3.0 100 80 60 VS = 5V RL = NO LOAD TA = 25 C 2.5 PHASE SHIFT - Degrees 45 90 135 180 OUTPUT SWING - V p-p 2.0 GAIN - dB 40 20 0 -20 -40 -60 1k 10k 100k 1M FREQUENCY - Hz 10M VS = 2.7V VIN = 2.6V p-p RL = 2k TA = 25 C AV = 1 1.5 1.0 0.5 100M 0 1k 10k 100k FREQUENCY - Hz 1M 10M TPC 19. Open-Loop Gain and Phase vs. Frequency TPC 22. Closed-Loop Output Voltage Swing vs. Frequency 6 VS = 3V TA = 25 C 40 CLOSED-LOOP GAIN - dB AV = 100 5 OUTPUT SWING - V p-p 20 AV = 10 4 3 VS = 5V VIN = 4.9V p-p RL = 2k TA = 25 C AV = 1 0 AV = 1 2 1 1k 10k 100k 1M FREQUENCY - Hz 10M 100M 0 1k 10k 100k FREQUENCY - Hz 1M 10M TPC 20. Closed-Loop Gain vs. Frequency TPC 23. Closed-Loop Output Voltage Swing vs. Frequency 200 VS = 5V TA = 25 C 40 180 AV = 100 160 VS = 3V TA = 25 C CLOSED-LOOP GAIN - dB OUTPUT IMPEDANCE - 140 AV = 100 120 100 AV = 10 80 AV = 1 60 40 20 20 AV = 10 0 AV = 1 1k 10k 100k 1M FREQUENCY - Hz 10M 100M 0 100 1k 10k 100k FREQUENCY - Hz 1M 10M TPC 21. Closed-Loop Gain vs. Frequency TPC 24. Output Impedance vs. Frequency -8- REV. D AD8601/AD8602/AD8604 200 180 160 OUTPUT IMPEDANCE - 160 VS = 5V TA = 25 C 140 POWER SUPPLY REJECTION - dB VS = 5V TA = 25 C 120 100 80 60 40 20 0 20 140 120 AV = 100 100 AV = 10 80 AV = 1 60 40 20 0 100 1k 10k 100k FREQUENCY - Hz 1M 10M 40 100 1k 10k 100k FREQUENCY - Hz 1M 10M TPC 25. Output Impedance vs. Frequency TPC 28. Power Supply Rejection Ratio vs. Frequency 160 140 VS = 3V TA = 25 C SMALL SIGNAL OVERSHOOT - % 70 60 50 VS = 2.7V RL = TA = 25 C AV = 1 OS 40 30 +OS 20 COMMON-MODE REJECTION - dB 120 100 80 60 40 20 0 20 40 1k 10k 100k FREQUENCY - Hz 1M 10M 20M 10 0 10 100 CAPACITANCE - pF 1k TPC 26. Common-Mode Rejection Ratio vs. Frequency TPC 29. Small Signal Overshoot vs. Load Capacitance 160 140 VS = 5V TA = 25 C SMALL SIGNAL OVERSHOOT - % 70 60 VS = 5V RL = TA = 25 C AV = 1 COMMON-MODE REJECTION - dB 120 100 80 60 40 20 0 20 40 1k 10k 100k FREQUENCY - Hz 1M 10M 20M 50 40 30 20 OS 10 +OS 0 10 100 CAPACITANCE - pF 1k TPC 27. Common-Mode Rejection Ratio vs. Frequency TPC 30. Small Signal Overshoot vs. Load Capacitance REV. D -9- AD8601/AD8602/AD8604 1.2 SUPPLY CURRENT PER AMPLIFIER - mA 0.1 VS = 5V 1.0 VS = 5V TA = 25 C G = 10 RL = 600 RL = 2k RL = 10k RL = 600 G=1 RL = 2k RL = 10k 0.8 THD + N - % 0.01 0.6 0.4 0.001 0.2 0 40 25 10 5 20 35 50 65 TEMPERATURE - C 80 95 110 125 0.0001 20 100 1k FREQUENCY - Hz 10k 20k TPC 31. Supply Current per Amplifier vs. Temperature TPC 34. Total Harmonic Distortion + Noise vs. Frequency 1.0 64 VS = 3V SUPPLY CURRENT PER AMPLIFIER - mA 0.8 VOLTAGE NOISE DENSITY - nV/ Hz 56 48 40 32 24 16 8 VS = 2.7V TA = 25 C 0.6 0.4 0.2 0 40 25 10 5 20 35 50 65 TEMPERATURE - C 80 95 110 125 0 0 5 10 15 FREQUENCY - kHz 20 25 TPC 32. Supply Current per Amplifier vs. Temperature TPC 35. Voltage Noise Density vs. Frequency 0.8 208 182 156 130 104 78 52 26 0 0 1 2 3 4 SUPPLY VOLTAGE - V 5 6 SUPPLY CURRENT PER AMPLIFIER - mA 0.6 0.5 0.4 0.3 0.2 0.1 0 VOLTAGE NOISE DENSITY - nV/ Hz 0.7 VS = 2.7V TA = 25 C 0 0.5 1.0 1.5 FREQUENCY - kHz 2.0 2.5 TPC 33. Supply Current per Amplifier vs. Supply Voltage TPC 36. Voltage Noise Density vs. Frequency -10- REV. D AD8601/AD8602/AD8604 208 182 156 130 104 78 52 26 0 VS = 5V TA = 25 C VOLTAGE - 2.5 V/DIV VS = 5V TA = 25 C VOLTAGE NOISE DENSITY - nV/ Hz 0 0.5 1.0 1.5 FREQUENCY - kHz 2.0 2.5 TIME - 1s/DIV TPC 37. Voltage Noise Density vs. Frequency TPC 40. 0.1 Hz to 10 Hz Input Voltage Noise 64 56 48 40 32 24 16 8 VS = 5V TA = 25 C VOLTAGE NOISE DENSITY - nV/ Hz VS = 5V RL = 10k CL = 200pF TA = 25 C 50.0mV/DIV 0 0 5 10 15 FREQUENCY - kHz 20 25 200ns/DIV TPC 38. Voltage Noise Density vs. Frequency TPC 41. Small Signal Transient Response VS = 2.7V TA = 25 C VS = 2.7V RL = 10k CL = 200pF TA = 25 C VOLTAGE - 2.5 V/DIV 50.0mV/DIV 200ns/DIV TIME - 1s/DIV TPC 39. 0.1 Hz to 10 Hz Input Voltage Noise TPC 42. Small Signal Transient Response REV. D -11- AD8601/AD8602/AD8604 VS = 5V RL = 10k CL = 200pF AV = 1 TA = 25 C VIN VS = 5V RL = 10k AV = 1 TA = 25 C VOLTAGE - 1.0V/DIV VOLTAGE - 1V/DIV VOUT TIME - 400ns/DIV TIME - 2.0 s/DIV TPC 43. Large Signal Transient Response TPC 46. No Phase Reversal VOLTAGE - 500mV/DIV VS = 2.7V RL = 10k CL = 200pF AV = 1 TA = 25 C VOLTAGE - V VS = 5V RL = 10k VO = 2V p-p TA = 25 C VIN +0.1% ERROR VOUT 0.1% ERROR VIN TRACE - 0.5V/DIV VOUT TRACE - 10mV/DIV TIME - 100ns/DIV TIME - 400ns/DIV TPC 44. Large Signal Transient Response TPC 47. Settling Time 2.0 VS = 2.7V RL = 10k AV = 1 TA = 25 C OUTPUT SWING - V 1.5 1.0 0.5 0 0.5 VS = 2.7V TA = 25 C 0.1% 0.01% VIN VOLTAGE - 1V/DIV VOUT 0.1% 1.0 1.5 2.0 300 0.01% 350 400 450 500 550 600 TIME - 2.0 s/DIV SETTLING TIME - ns TPC 45. No Phase Reversal TPC 48. Output Swing vs. Settling Time -12- REV. D AD8601/AD8602/AD8604 5 4 3 OUTPUT SWING - V Rail-to-Rail Input Stage VS = 5V TA = 25 C 2 1 0.1% 0 1 2 3 4 5 0 200 400 600 800 1,000 SETTLING TIME - ns 0.1% 0.01% 0.01% The input common-mode voltage range of the AD860x extends to both positive and negative supply voltages. This maximizes the usable voltage range of the amplifier, an important feature for single-supply and low voltage applications. This rail-to-rail input range is achieved by using two input differential pairs, one NMOS and one PMOS, placed in parallel. The NMOS pair is active at the upper end of the common-mode voltage range, and the PMOS pair is active at the lower end. The NMOS and PMOS input stages are separately trimmed using DigiTrim to minimize the offset voltage in both differential pairs. Both NMOS and PMOS input differential pairs are active in a 500 mV transition region, when the input commonmode voltage is between approximately 1.5 V and 1 V below the positive supply voltage. Input offset voltage will shift slightly in this transition region, as shown in TPCs 5 and 6. Commonmode rejection ratio will also be slightly lower when the input common-mode voltage is within this transition band. Compared to the Burr Brown OPA2340 rail-to-rail input amplifier, shown in Figure 1, the AD860x, shown in Figure 2, exhibits lower offset voltage shift across the entire input common-mode range, including the transition region. 0.7 0.4 0.1 VOS - mV TPC 49. Output Swing vs. Settling Time THEORY OF OPERATION The AD8601/AD8602/AD8604 family of amplifiers are rail-torail input and output precision CMOS amplifiers that operate from 2.7 V to 5.0 V of power supply voltage. These amplifiers use Analog Devices' DigiTrim(R) technology to achieve a higher degree of precision than available from most CMOS amplifiers. DigiTrim technology is a method of trimming the offset voltage of the amplifier after it has already been assembled. The advantage in post-package trimming lies in the fact that it corrects any offset voltages due to the mechanical stresses of assembly. This technology is scalable and used with every package option, including SOT-23-5, providing lower offset voltages than previously achieved in these small packages. The DigiTrim process is done at the factory and does not add additional pins to the amplifier. All AD860x amplifiers are available in standard op amp pinouts, making DigiTrim completely transparent to the user. The AD860x can be used in any precision op amp application. The input stage of the amplifier is a true rail-to-rail architecture, allowing the input common-mode voltage range of the op amp to extend to both positive and negative supply rails. The voltage swing of the output stage is also rail-to-rail and is achieved by using an NMOS and PMOS transistor pair connected in a common-source configuration. The maximum output voltage swing is proportional to the output current, and larger currents will limit how close the output voltage can get to the supply rail. This is a characteristic of all rail-to-rail output amplifiers. With 1 mA of output current, the output voltage can reach within 20 mV of the positive rail and within 15 mV of the negative rail. At light loads of >100 k, the output swings within ~1 mV of the supplies. The open-loop gain of the AD860x is 80 dB, typical, with a load of 2 k. Because of the rail-to-rail output configuration, the gain of the output stage and the open-loop gain of the amplifier are dependent on the load resistance. Open-loop gain will decrease with smaller load resistances. Again, this is a characteristic inherent to all rail-to-rail output amplifiers. 0.2 0.5 0.8 1.1 1.4 0 1 2 VCM - V 3 4 5 Figure 1. Burr Brown OPA2340UR Input Offset Voltage vs. Common-Mode Voltage, 24 SOIC Units @ 25C 0.7 0.4 0.1 VOS - mV 0.2 0.5 0.8 1.1 1.4 0 1 2 VCM - V 3 4 5 Figure 2. AD8602AR Input Offset Voltage vs. Common-Mode Voltage, 300 SOIC Units @ 25C REV. D -13- AD8601/AD8602/AD8604 Input Overvoltage Protection As with any semiconductor device, if a condition could exist that would cause the input voltage to exceed the power supply, the device's input overvoltage characteristic must be considered. Excess input voltage will energize internal PN junctions in the AD860x, allowing current to flow from the input to the supplies. This input current will not damage the amplifier, provided it is limited to 5 mA or less. This can be ensured by placing a resistor in series with the input. For example, if the input voltage could exceed the supply by 5 V, the series resistor should be at least (5 V/5 mA) = 1 k. With the input voltage within the supply rails, a minimal amount of current is drawn into the inputs, which, in turn, causes a negligible voltage drop across the series resistor. Therefore, adding the series resistor will not adversely affect circuit performance. Overdrive Recovery 10pF (OPTIONAL) 4.7M D1 VOUT 4.7V/ A AD8601 Figure 3. Amplifier Photodiode Circuit High- and Low-Side Precision Current Monitoring Overdrive recovery is defined as the time it takes the output of an amplifier to come off the supply rail when recovering from an overload signal. This is tested by placing the amplifier in a closed-loop gain of 10 with an input square wave of 2 V p-p while the amplifier is powered from either 5 V or 3 V. The AD860x has excellent recovery time from overload conditions. The output recovers from the positive supply rail within 200 ns at all supply voltages. Recovery from the negative rail is within 500 ns at 5 V supply, decreasing to within 350 ns when the device is powered from 2.7 V. Power-On Time Because of its low input bias current and low offset voltage, the AD860x can be used for precision current monitoring. The true rail-to-rail input feature of the AD860x allows the amplifier to monitor current on either high-side or low-side. Using both amplifiers in an AD8602 provides a simple method for monitoring both current supply and return paths for load or fault detection. Figures 4 and 5 demonstrate both circuits. 3V R2 2.49k MONITOR OUTPUT Q1 2N3904 3V R1 100 RSENSE 0.1 1/2 AD8602 RETURN TO GROUND Power-on time is important in portable applications, where the supply voltage to the amplifier may be toggled to shut down the device to improve battery life. Fast power-up behavior ensures that the output of the amplifier will quickly settle to its final voltage, improving the power-up speed of the entire system. Once the supply voltage reaches a minimum of 2.5 V, the AD860x will settle to a valid output within 1 s. This turn-on response time is faster than many other precision amplifiers, which can take tens or hundreds of microseconds for their outputs to settle. Using the AD8602 in High Source Impedance Applications Figure 4. A Low-Side Current Monitor RSENSE 0.1 3V 3V R1 100 IL V+ 1/2 AD8602 The CMOS rail-to-rail input structure of the AD860x allows these amplifiers to have very low input bias currents, typically 0.2 pA. This allows the AD860x to be used in any application that has a high source impedance or must use large value resistances around the amplifier. For example, the photodiode amplifier circuit shown in Figure 3 requires a low input bias current op amp to reduce output voltage error. The AD8601 minimizes offset errors due to its low input bias current and low offset voltage. The current through the photodiode is proportional to the incident light power on its surface. The 4.7 M resistor converts this current into a voltage, with the output of the AD8601 increasing at 4.7 V/A. The feedback capacitor reduces excess noise at higher frequencies by limiting the bandwidth of the circuit to 1 BW = 2(4.7 M)CF (1) Q1 2N3905 MONITOR OUTPUT R2 2.49k Figure 5. A High-Side Current Monitor Voltage drop is created across the 0.1 resistor that is proportional to the load current. This voltage appears at the inverting input of the amplifier due to the feedback correction around the op amp. This creates a current through R1 which, in turn, pulls current through R2. For the low-side monitor, the monitor output voltage is given by R Monitor Output = 3V - R2 x SENSE x IL R1 (2) Using a 10 pF feedback capacitor limits the bandwidth to approximately 3.3 kHz. -14- REV. D AD8601/AD8602/AD8604 For the high-side monitor, the monitor output voltage is R Monitor Output = R2 x SENSE x IL R1 The AD8601, AD7476, and AD5320 are all available in spacesaving SOT-23 packages. (3) PC100 Compliance for Computer Audio Applications Using the components shown, the monitor output transfer function is 2.5 V/A. Using the AD8601 in Single-Supply Mixed-Signal Applications Single-supply mixed-signal applications requiring 10 or more bits of resolution demand both a minimum of distortion and a maximum range of voltage swing to optimize performance. To ensure that the A/D or D/A converters achieve their best performance, an amplifier often must be used for buffering or signal conditioning. The 750 V maximum offset voltage of the AD8601 allows the amplifier to be used in 12-bit applications powered from a 3 V single supply, and its rail-to-rail input and output ensure no signal clipping. Figure 6 shows the AD8601 used as an input buffer amplifier to the AD7476, a 12-bit 1 MHz A/D converter. As with most A/D converters, total harmonic distortion (THD) increases with higher source impedances. By using the AD8601 in a buffer configuration, the low output impedance of the amplifier minimizes THD while the high input impedance and low bias current of the op amp minimizes errors due to source impedance. The 8 MHz gain-bandwidth product of the AD8601 ensures no signal attenuation up to 500 kHz, which is the maximum Nyquist frequency for the AD7476. 3V 680nF 1F TANT REF193 0.1 F 10 F 5V SUPPLY 0.1 F Because of its low distortion and rail-to-rail input and output, the AD860x is an excellent choice for low-cost, single-supply audio applications, ranging from microphone amplification to line output buffering. TPC 34 shows the total harmonic distortion plus noise (THD + N) figures for the AD860x. In unity gain, the amplifier has a typical THD + N of 0.004%, or -86 dB, even with a load resistance of 600 . This is compliant with the PC100 specification requirements for audio in both portable and desktop computers. Figure 8 shows how an AD8602 can be interfaced with an AC'97 codec to drive the line output. Here, the AD8602 is used as a unity-gain buffer from the left and right outputs of the AC'97 codec. The 100 F output coupling capacitors block dc current and the 20 series resistors protect the amplifier from short circuits at the jack. 5V VDD 2 V DD 28 LEFTOUT 35 3 U1-A 4 5V 8 1 C1 100 F R2 2k R4 20 AD1881 (AC'97) RIGHTOUT 36 VSS 5 U1-B 6 7 C2 100 F R3 2k R5 20 4 RS 3 5 1 2 VDD VIN GND SCLK SDATA CS C/ P NOTE: ADDITIONAL PINS OMITTED FOR CLARITY U1 = AD8602D AD8601 VIN AD7476/AD7477 SERIAL INTERFACE Figure 8. A PC100 Compliant Line Output Amplifier SPICE Model Figure 6. A Complete 3 V 12-Bit 1 MHz A/D Conversion System Figure 7 demonstrates how the AD8601 can be used as an output buffer for the DAC for driving heavy resistive loads. The AD5320 is a 12-bit D/A converter that can be used with clock frequencies up to 30 MHz and signal frequencies up to 930 kHz. The rail-to-rail output of the AD8601 allows it to swing within 100 mV of the positive supply rail while sourcing 1 mA of current. The total current drawn from the circuit is less than 1 mA, or 3 mW from a 3 V single supply. 3V The SPICE macro-model for the AD860x amplifier is available and can be downloaded from the Analog Devices website at www.analog.com. The model will accurately simulate a number of both dc and ac parameters, including open-loop gain, bandwidth, phase margin, input voltage range, output voltage swing versus output current, slew rate, input voltage noise, CMRR, PSRR, and supply current versus supply voltage. The model is optimized for performance at 27C. Although it will function at different temperatures, it may lose accuracy with respect to the actual behavior of the AD860x. 1F 4 3-WIRE SERIAL INTERFACE 5 6 4 5 1 VOUT 0V TO 3.0V RL AD5320 2 1 3 2 AD8601 Figure 7. Using the AD8601 as a DAC Output Buffer to Drive Heavy Loads REV. D -15- AD8601/AD8602/AD8604 OUTLINE DIMENSIONS 14-Lead Thin Shrink Small Outline Package [TSSOP] (RU-14) Dimensions shown in millimeters 5.10 5.00 4.90 5 14 8 5-Lead Small Outline Transistor Package [SOT-23] (RT-5) Dimensions shown in millimeters 2.90 BSC 4 1.60 BSC 6.40 BSC PIN 1 1 2 3 2.80 BSC 4.50 4.40 4.30 1 7 0.95 BSC 1.30 1.15 0.90 1.20 MAX 0.20 0.09 8 0 0.75 0.60 0.45 1.90 BSC PIN 1 1.05 1.00 0.80 0.65 BSC 1.45 MAX 0.15 0.05 0.22 0.08 10 5 0 0.60 0.45 0.30 0.30 0.19 SEATING COPLANARITY PLANE 0.10 0.15 MAX 0.50 0.30 SEATING PLANE COMPLIANT TO JEDEC STANDARDS MO-153AB-1 COMPLIANT TO JEDEC STANDARDS MO-178AA 14-Lead Standard Small Outline Package [SOIC] (R-14) Dimensions shown in millimeters and (inches) 8.75 (0.3445) 8.55 (0.3366) 4.00 (0.1575) 3.80 (0.1496) 14 1 8 7 8-Lead Mini Small Outline Package [MSOP] (RM-8) Dimensions shown in millimeters 3.00 BSC 6.20 (0.2441) 5.80 (0.2283) 8 5 3.00 BSC 1 4 4.90 BSC 0.25 (0.0098) 0.10 (0.0039) 1.27 (0.0500) BSC 1.75 (0.0689) 1.35 (0.0531) 0.50 (0.0197) 0.25 (0.0098) 45 PIN 1 0.65 BSC 0.15 0.00 0.38 0.22 COPLANARITY 0.10 1.10 MAX 8 0 0.80 0.60 0.40 COPLANARITY 0.10 0.51 (0.0201) 0.31 (0.0122) SEATING PLANE 8 0.25 (0.0098) 0 1.27 (0.0500) 0.40 (0.0157) 0.17 (0.0067) COMPLIANT TO JEDEC STANDARDS MS-012AB 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 0.23 0.08 SEATING PLANE COMPLIANT TO JEDEC STANDARDS MO-187AA 8-Lead Standard Small Outline Package [SOIC] (R-8) Dimensions shown in millimeters and (inches) 5.00 (0.1968) 4.80 (0.1890) 8 5 4 4.00 (0.1574) 3.80 (0.1497) 1 6.20 (0.2440) 5.80 (0.2284) 1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0040) COPLANARITY SEATING 0.10 PLANE 1.75 (0.0688) 1.35 (0.0532) 8 0.25 (0.0098) 0 0.17 (0.0067) 0.50 (0.0196) 0.25 (0.0099) 45 0.51 (0.0201) 0.31 (0.0122) 1.27 (0.0500) 0.40 (0.0157) COMPLIANT TO JEDEC STANDARDS MS-012AA 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 -16- REV. D AD8601/AD8602/AD8604 Revision History Location 11/03--Data Sheet changed from REV. C to REV. D. Page Changes to FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Changes to ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3/03--Data Sheet changed from REV. B to REV. C. Changes to FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 3/03--Data Sheet changed from REV. A to REV. B. Change to FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Change to FUNCTIONAL BLOCK DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Change to TPC 39 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Changes to Figures 4 and 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Changes to Equations 2 and 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14, 15 Updated OUTLINE DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 REV. D -17- -18- -19- -20- C01525-0-11/03(D) |
Price & Availability of AD860103
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