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16 V, 4 MHz Rail-to-Rail Output Amplifier AD8666/AD8668 FEATURES Offset voltage: 2.5 mV max Low input bias current: 1 pA max Single-supply operation: 5 V to 16 V Dual-supply operation: 2.5 V to 8 V Low noise: 8 nV/Hz @ 10 kHz Wide bandwidth: 4 MHz Rail-to-rail output Unity gain stable Lead-free packaging PIN CONFIGURATIONS OUT A -IN A +IN A V- 1 2 3 8 V+ OUT B +IN B 06018-001 06018-004 AD8666 7 6 5 TOP VIEW 4 (Not to Scale) -IN B Figure 1. AD8666, 8-Lead SOIC_N (R-8) OUT A -IN A +IN A V- 1 2 3 4 8 V+ OUT B +IN B 06018-002 AD8666 TOP VIEW (Not to Scale) 7 6 5 -IN B APPLICATIONS Sensor amplification Reference buffers Medical equipment Physiological measurements Signal filters and conditioning Consumer audio Photodiode amplification ADC driver Level shifting circuits Figure 2. AD8666, 8-Lead MSOP (RM-8) OUT A -IN A +IN A V+ +IN B -IN B OUT B 1 2 3 4 5 6 7 14 13 OUT D -IN D +IN D V- +IN C -IN C OUT C 06018-003 AD8668 TOP VIEW (Not to Scale) 12 11 10 9 8 Figure 3. AD8668, 14-Lead TSSOP (RU-14) OUT A -IN A +IN A V+ +IN B -IN B OUT B 1 2 3 4 14 13 OUT D -IN D +IN D AD8668 AD8648 12 11 V- TOP VIEW 5 (Not to Scale) 10 +IN C 6 7 9 8 -IN C OUT C Figure 4. AD8668, 14-Lead SOIC_N (R-14) GENERAL DESCRIPTION The AD8666/AD8668 are single supply, rail-to-rail output amplifiers with low noise performance featuring an extended operating range with supply voltages up to 16 V. They also feature low input bias currents, wide signal bandwidth, and low input voltage and current noise. For lower offset voltage, choose the AD8662 (dual). The combination of offsets, very low input bias currents, and wide supply range make these amplifiers useful in a wide variety of cost-sensitive applications normally associated with much higher priced JFET amplifiers. Systems utilizing high impedance sensors, such as photo diodes, benefit from the combination of low input bias current, low noise, and low offset and bandwidth. The wide operating voltage range matches today's high performance ADCs and DACs. Audio applications and medical monitoring equipment can take advantage of the high input impedance, low voltage and current noise, wide bandwidth, and the lack of "popcorn" noise found in many other low input bias current amplifiers. The AD8666/AD8668 are specified over the extended industrial temperature range (-40 to +125C). 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)2006 Analog Devices, Inc. All rights reserved. AD8666/AD8668 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Pin Configurations ........................................................................... 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Absolute Maximum Ratings ............................................................5 Thermal Resistance .......................................................................5 ESD Caution...................................................................................5 Typical Performance Characteristics ..............................................6 Outline Dimensions ....................................................................... 12 Ordering Guide .......................................................................... 12 REVISION HISTORY 4/06--Rev 0: Initial Version Rev. 0 | Page 2 of 16 AD8666/AD8668 SPECIFICATIONS VDD = 5.0 V, VCM = VDD/2, TA = 25oC, unless otherwise noted. Table 1. Parameter INPUT CHARACTERISTICS Offset Voltage Symbol VOS Conditions VCM = 2.5 V VCM = -0.1 V to +3.0 V -40C < TA < +125C -40C < TA < +125C -40C < TA < +125C Input Offset Current Input Voltage Range Common-Mode Rejection Ratio Large-Signal Voltage Gain OUTPUT CHARACTERISTICS Output Voltage High Output Voltage Low Short-Circuit Output Current Closed-Loop Output Impedance POWER SUPPLY Power Supply Rejection Ratio Supply Current per Amplifier DYNAMIC PERFORMANCE Slew Rate Gain Bandwidth Product Phase Margin NOISE PERFORMANCE Peak-to-Peak Noise Voltage Noise Density Channel Separation IOS -40C < TA < +125C VCM CMRR AVO VOH VOL ISC ZOUT PSRR ISY -40C < TA < +125C SR GBP M en p-p en CS RL = 2 k 3.5 4 70 2.4 10 8 -115 VCM = -0.1 V to +3.0 V -40C < TA < +125C RL = 2 k, VO = 0.5 V to 4.5 V IOUT = 1 mA -40C < TA < +125C IOUT = 1 mA -40C < TA < +125C At 1MHz, AV = 1 VDD = 5.0 V to 16 V -40C < TA < +125C 98 94 -0.1 84 79 68 4.88 4.86 100 145 4.93 50 19 50 115 1.1 1.4 2.0 85 105 0.1 Min Typ 0.7 Max 2.5 3.0 5.0 10 1 550 0.5 70 +3.0 Unit mV mV mV V/C pA pA pA pA V dB dB V/mV V V mV mV mA dB dB mA mA V/s MHz Degrees V p-p nV/Hz nV/Hz dB Offset Voltage Drift Input Bias Current VOS/T IB 3.0 0.2 0.1 Hz to 10 Hz f = 1 kHz f = 10 kHz f = 10 kHz Rev. 0 | Page 3 of 16 AD8666/AD8668 VDD = 16 V, VCM = VDD/2, TA = 25oC, unless otherwise noted. Table 2. Parameter INPUT CHARACTERISTICS Offset Voltage Symbol VOS Conditions VCM = 8 V VCM = -0.1 V to +14.0 V -40C < TA < +125C -40C < TA < +125C -40C < TA < +125C Input Offset Current Input Voltage Range Common-Mode Rejection Ratio Large-Signal Voltage Gain OUTPUT CHARACTERISTICS Output Voltage High Output Voltage Low Short-Circuit Output Current Closed-Loop Output Impedance POWER SUPPLY Power Supply Rejection Ratio Supply Current per Amplifier DYNAMIC PERFORMANCE Slew Rate Gain Bandwidth Product Phase Margin NOISE PERFORMANCE Peak-to-Peak Noise Voltage Noise Density Channel Separation IOS -40C < TA < +125C VCM CMRR AVO VOH VOL ISC ZOUT PSRR ISY -40C < TA < +125C SR GBP M en p-p en CS RL = 2 k 3.5 4 73 2.5 10 8 -115 VCM = -0.1 V to +14.0 V -40C < TA < +125C RL = 2 k, VO = 0.5 V to 15.5 V IOUT = 1 mA -40C < TA < +125C IOUT = 1 mA -40C < TA < +125C At 1MHz, AV = 1 VDD = 5.0 V to 16 V -40C < TA < +125C 98 94 -0.1 90 80 130 15.94 15.90 110 255 15.96 22 140 50 115 1.15 1.55 2.0 40 50 0.1 Min Typ 0.6 Max 2.5 3.0 5.0 10 1 550 0.5 70 +14.0 Unit mV mV mV V/C pA pA pA pA V dB dB V/mV V V mV mV mA dB dB mA mA V/s MHz Degrees V p-p nV/Hz nV/Hz dB Offset Voltage Drift Input Bias Current VOS/T IB 3.0 0.2 0.1 Hz to 10 Hz f = 1 kHz f = 10 kHz f = 10 kHz Rev. 0 | Page 4 of 16 AD8666/AD8668 ABSOLUTE MAXIMUM RATINGS Table 3. Parameter Supply Voltage Input Voltage Differential Input Voltage Output Short-Circuit to GND Storage Temperature Range Operating Temperature Range Lead Temperature (Soldering, 60 sec) Junction Temperature Rating 18 V GND to VDD 18 V Indefinite -65C to +150C -40C to +125C 300C 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. THERMAL RESISTANCE Table 4. Thermal Resistance Package Type 8-Lead SOIC_N (R-8) 8-Lead MSOP (RM-8) 14-Lead SOIC (R-14) 14-Lead TSSOP (RU-14) JA 158 210 120 180 JC 43 45 36 35 Unit C/W C/W 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 16 AD8666/AD8668 TYPICAL PERFORMANCE CHARACTERISTICS 100 VDD = 16V 90 VCM = 8V TA = 25C 600 AMPLIFIERS 80 70 60 50 40 30 20 10 -2 -1 0 1 2 3 06018-005 300 VS = 5V AND 16V 250 INPUT BIAS CURRENT (pA) NUMBER OF AMPLIFIERS 200 150 100 50 -20 0 20 40 60 80 100 120 INPUT OFFSET VOLTAGE (mV) TEMPERATURE (C) Figure 5. Input Offset Voltage Distribution Figure 8. Input Bias Current vs. Temperature 20 18 16 OUTPUT SATURATION VOLTAGE (mV) VDD = 16V VCM = 8V -40C TA +125C 300 AMPLIFIERS 10000 VDD = 16V TA = 25C 1000 VDD TO VOH SOURCING 100 VOL SINKING NUMBER OF AMPLIFIERS 14 12 10 8 6 4 2 06018-006 10 1 0 1 2 3 4 5 6 7 8 9 10 11 12 0.01 0.1 1 10 100 TCVOS (V/C) LOAD CURRENT (mA) Figure 6. VOS Drift (TCVOS) Distribution Figure 9. Output Saturation Voltage vs. Load Current 5 INPUT OFFSET VOLTAGE (mV) 3 2 1 0 -1 -2 -3 -4 06018-007 OUTPUT SATURATION VOLTAGE (mV) VDD = 16V 4 TA +25C 100 VDD = 16V IOUT = 1mA 80 60 VDD TO VOH SOURCING 40 20 VOL SINKING 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 -20 0 20 40 60 80 100 120 INPUT COMMON-MODE VOLTAGE (V) TEMPERATURE (C) Figure 7. Offset Voltage vs. Common-Mode Voltage Figure 10. Output Saturation Voltage vs. Temperature Rev. 0 | Page 6 of 16 06018-010 -5 -1 0 -40 06018-009 0 0.1 0.001 06018-008 0 -3 0 -40 AD8666/AD8668 80 OPEN-LOOP PHASE SHIFT (Degrees) VDD = 16V RL = 2k CL = 10pF 0 100 VDD = 16V TA = 25C 60 45 80 OPEN-LOOP GAIN (dB) PSRR (dB) 40 PHASE 90 60 20 GAIN M =73 135 40 0 180 20 PSRR- PSRR+ 06018-011 10k 100k FREQUENCY (Hz) 1M 10k 100k FREQUENCY (Hz) 1M 4M Figure 11. Open-Loop Gain and Phase vs. Frequency Figure 14. Power Supply Rejection Ratio vs. Frequency 1000 VDD = 16V 100 VDD = 5V TO 16V TA = 25C 100 ZOUT () 10 AV = 100 AV = 10 AV = 1 VOLTAGE NOISE DENSITY (nV/Hz) 10 1 0.1 1k 10k 100k 1M 10M 06018-012 100 FREQUENCY (Hz) 1k 10k FREQUENCY (Hz) Figure 12. Closed-Loop Output Impedance vs. Frequency Figure 15. Voltage Noise Density vs. Frequency 120 VDD = 16V TA = 25C 100 VDD = 5V TO 16V TA = 25C 80 60 40 20 FREQUENCY (Hz) TIME (1s/DIV) Figure 13. Common-Mode Rejection Ratio vs. Frequency Figure 16. 0.1 Hz to 10 Hz Voltage Noise Rev. 0 | Page 7 of 16 06018-016 10k 100k 1M 4M 06018-013 0 1k VOLTAGE (1V/DIV) CMRR (dB) 06018-015 0.01 100 1 10 06018-014 -20 1k 225 10M 0 1k AD8666/AD8668 VDD = 16V RL = 10k CL = 10pF AV = +1 0V VDD = 8V AV = -100 VIN VOUT (20mV/DIV) -100mV 8V VOUT 0V 06018-017 06018-020 TIME (0.5s/DIV) TIME (5s/DIV) Figure 17. Small-Signal Transient Response Figure 20. Positive Overload Recovery Time 10 8 6 4 VOUT (V) VDD = 8V RL = 10k CL = 10pF AV = +1 100mV VDD = 8V AV = -100 VIN 2 0 -2 -4 -6 -8 -10 TIME (2s/DIV) 06018-018 0V 0V -8V VOUT 06018-021 TIME (5s/DIV) Figure 18. Large-Signal Transient Response Figure 21. Negative Overload Recovery Time 70 VDD = 16V VIN = 100mV p-p 60 50 80 VDD = 5V VCM = 2.5V 70 TA = 25C 550 AMPLIFIERS NUMBER OF AMPLIFIERS 60 50 40 30 20 10 0 -3 OVERSHOOT (%) 40 +OS 30 20 10 0 -OS 1 10 100 1000 06018-019 -2 -1 0 1 2 3 LOAD CAPACITANCE (pF) INPUT OFFSET VOLTAGE (mV) Figure 19. Small-Signal Overshoot vs. Load Capacitance Figure 22. Input Offset Voltage Distribution Rev. 0 | Page 8 of 16 06018-022 AD8666/AD8668 30 25 NUMBER OF AMPLIFIERS OUTPUT SATURATION VOLTAGE (mV) VDD = 5V VCM = 2.5V -40C TA +125C 300 AMPLIFIERS 120 VDD = 5V ILOAD = 1mA 100 VDD TO VOH SOURCING 80 20 15 60 VOL SINKING 40 10 5 20 06018-023 0 1 2 3 4 5 6 7 8 9 10 -20 0 20 40 60 80 100 120 TCVOS (V/C) TEMPERATURE (C) Figure 23. VOS Drift (TCVOS) Distribution Figure 26. Output Saturation Voltage vs. Temperature 5 4 VDD = 5V TA = 25C 80 INPUT OFFSET VOLTAGE (mV) 3 2 1 0 -1 -2 -3 -4 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 60 45 40 PHASE 90 20 GAIN 0 M =70 135 180 10k 100k FREQUENCY (Hz) 1M INPUT COMMON-MODE VOLTAGE (V) Figure 24. Offset Voltage vs. Common-Mode Voltage Figure 27. Open-Loop Gain and Phase vs. Frequency 3000 OUTPUT SATURATION VOLTAGE (mV) 1000 VDD = 5V TA = 25C 1000 VDD = 5V 100 100 VDD TO VOH SOURCING 10 ZOUT () 10 AV = 100 1 VOL SINKING AV = 10 1 0.1 AV = 1 06018-025 0.01 0.1 LOAD CURRENT (mA) 1 10 20 1k 10k 100k 1M 10M FREQUENCY (Hz) Figure 25. Output Saturation Voltage vs. Load Current Figure 28. Closed-Loop Output Impedance vs. Frequency Rev. 0 | Page 9 of 16 06018-028 0.1 0.001 0.01 100 06018-027 06018-024 -5 -0.5 -20 1k 225 10M OPEN-LOOP PHASE SHIFT (Degrees) VDD = 5V RL = 2k CL = 10pF 0 OPEN-LOOP GAIN (dB) 06018-026 0 0 -40 AD8666/AD8668 120 VDD = 5V TA = 25C 1.5 1.0 0.5 0 100 VDD = 2.5V RL = 10k CL = 10pF AV = +1 80 CMRR (dB) 60 VOUT (V) -0.5 -1.0 -1.5 -2.0 40 20 10k 100k FREQUENCY (Hz) 1M 4M 06018-029 -2.5 TIME (1s/DIV) Figure 29. Common-Mode Rejection Ratio vs. Frequency Figure 32. Large-Signal Transient Response 100 VDD = 5V TA = 25C 70 60 VDD = 5V VIN = 100mV p-p 80 50 PSRR (dB) 60 OVERSHOOT (%) 40 +OS 30 20 10 -OS 40 PSRR- 20 PSRR+ 06018-030 10k 100k FREQUENCY (Hz) 1M 4M 1 10 100 1000 LOAD CAPACITANCE (pF) Figure 30. Power Supply Rejection Ratio vs. Frequency Figure 33. Small-Signal Overshoot vs. Load Capacitance VDD = 5V RL = 100k CL = 10pF AV = +1 VDD = 2.5V AV = -100 2.5V VOUT VOUT (20mV/DIV) 0V 0V VIN -100mV 06018-031 06018-034 TIME (0.4s/DIV) TIME (4s/DIV) Figure 31. Small-Signal Transient Response Figure 34. Positive Overload Recovery Time Rev. 0 | Page 10 of 16 06018-033 0 1k 0 06018-032 0 1k AD8666/AD8668 2.00 VDD = 2.5V AV = -100 1.75 1.50 1.25 1.00 0.75 0.50 0.25 0 100mV VIN 0V 0V VOUT -2.5V TIME (4s/DIV) 06018-035 SUPPLY CURRENT (mA) 0 2 4 6 8 10 12 14 16 SUPPLY VOLTAGE (V) Figure 35. Negative Overload Recovery Time Figure 37. Supply Current vs. Supply Voltage 2.0 1.8 1.6 VOUT = VDD/2 10 8 6 VDD = 16V VIN VOUT VDD = 8V AV = +1 SUPPLY CURRENT (mA) 1.4 1.2 1.0 0.8 0.6 0.4 0.2 -20 0 20 40 60 80 100 120 06018-036 4 VOUT (V) VDD = 5V 2 0 -2 -4 -6 -8 -10 TIME (10s/DIV) 06018-038 0 -40 TEMPERATURE (C) Figure 36. Supply Current vs. Temperature Figure 38. No Output Phase Reversal Rev. 0 | Page 11 of 16 06018-037 AD8666/AD8668 OUTLINE DIMENSIONS 5.00 (0.1968) 4.80 (0.1890) 8 5 4 5.10 5.00 4.90 4.00 (0.1574) 3.80 (0.1497) 1 6.20 (0.2440) 5.80 (0.2284) 14 8 4.50 4.40 4.30 0.50 (0.0196) x 45 0.25 (0.0099) 1 7 6.40 BSC 1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0040) 1.75 (0.0688) 1.35 (0.0532) PIN 1 1.05 1.00 0.80 0.65 BSC 1.20 MAX 0.15 0.05 0.30 0.19 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) 0.20 0.09 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. SEATING COPLANARITY PLANE 0.10 8 0 0.75 0.60 0.45 COMPLIANT TO JEDEC STANDARDS MO-153-AB-1 Figure 39. 8-Lead Standard Small Outline Package [SOIC_N] Narrow Body (R-8) Dimensions shown in millimeters and (inches) 3.20 3.00 2.80 Figure 41. 14-Lead Thin Shrink Small Outline Package [TSSOP] (RU-14) Dimensions shown in millimeters 8.75 (0.3445) 8.55 (0.3366) 5 3.20 3.00 2.80 PIN 1 8 1 5.15 4.90 4.65 4 4.00 (0.1575) 3.80 (0.1496) 14 1 8 7 6.20 (0.2441) 5.80 (0.2283) 0.65 BSC 0.95 0.85 0.75 0.15 0.00 0.38 0.22 SEATING PLANE 1.10 MAX 8 0 0.80 0.60 0.40 0.25 (0.0098) 0.10 (0.0039) COPLANARITY 0.10 1.27 (0.0500) BSC 1.75 (0.0689) 1.35 (0.0531) 0.50 (0.0197) x 45 0.25 (0.0098) 0.23 0.08 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) COPLANARITY 0.10 COMPLIANT TO JEDEC STANDARDS MO-187-AA COMPLIANT TO JEDEC STANDARDS MS-012-AB 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. Figure 40. 8-Lead Mini Small Outline Package [MSOP] (RM-8) Dimensions shown in millimeters Figure 42. 14-Lead Standard Small Outline Package [SOIC_N] Narrow Body (R-14) Dimensions shown in millimeters ORDERING GUIDE Model AD8666ARZ1 AD8666ARZ-REEL1 AD8666ARZ-REEL71 AD8666ARMZ-R21 AD8666ARMZ-REEL1 AD8668ARZ 1 AD8668ARZ-REEL1 AD8668ARZ-REEL71 AD8668ARUZ1 AD8668ARUZ-REEL1 1 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 Package Description 8-Lead SOIC_N 8-Lead SOIC_N 8-Lead SOIC_N 8-Lead MSOP 8-Lead MSOP 14-Lead SOIC_N 14-Lead SOIC_N 14-Lead SOIC_N 14-Lead TSSOP 14-Lead TSSOP Package Option R-8 R-8 R-8 RM-8 RM-8 R-14 R-14 R-14 RU-14 RU-14 Branding A16 A16 Z = Pb-free part. Rev. 0 | Page 12 of 16 AD8666/AD8668 NOTES Rev. 0 | Page 13 of 16 AD8666/AD8668 NOTES Rev. 0 | Page 14 of 16 AD8666/AD8668 NOTES Rev. 0 | Page 15 of 16 AD8666/AD8668 NOTES (c)2006 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D06018-0-4/06(0) Rev. 0 | Page 16 of 16 |
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