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| 24 MHz Rail-to-Rail Dual Amplifier AD8646 FEATURES Offset voltage: 2.5 mV maximum Single-supply operation: 2.7 V to 5.5 V Low noise: 8 nV/Hz Wide bandwidth: 24 MHz Slew rate: 12 V/s Short-circuit output current: 150 mA No phase reversal Low input bias current: 1 pA Low supply current: 2 mA maximum Unity gain stable PIN CONFIGURATION OUTA 1 -INA 2 +INA 3 8 V+ OUTB 06527-001 AD8646 7 TOP VIEW 6 -INB (Not to Scale) V- 4 5 +INB Figure 1. APPLICATIONS Battery-powered instruments Multipole filters ADC front ends Sensors Barcode scanners ASIC input or output amplifiers Audio amplifiers Photodiode amplifiers Datapath/mux/switch control GENERAL DESCRIPTION The AD8646 is a dual, rail-to-rail, input and output, singlesupply amplifier featuring low offset voltage, wide signal bandwidth, low input voltage, and low current noise. The combination of 24 MHz bandwidth, low offset, low noise, and very low input bias current makes these amplifiers useful in a wide variety of applications. Filters, integrators, photodiode amplifiers, and high impedance sensors all benefit from the combination of performance features. AC applications benefit from the wide bandwidth and low distortion. This amplifier offers high output drive capability, which is excellent for audio line drivers and other low impedance applications. Applications include portable and low powered instrumentation, audio amplification for portable devices, portable phone headsets, barcode scanners, 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. 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)2007 Analog Devices, Inc. All rights reserved. AD8646 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Pin Configuration............................................................................. 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 8/07--Revision 0: Initial Version Rev. 0 | Page 2 of 12 AD8646 SPECIFICATIONS VDD = 5 V, VCM = VDD/2, TA = +25oC, unless otherwise noted. Table 1. Parameter INPUT CHARACTERISTICS Offset Voltage Offset Voltage Drift Input Bias Current Symbol VOS VOS/T IB Conditions VCM = 2.5 V -40C < TA < +125C -40C < TA < +125C -40C < TA < +85C -40C < TA < +125C Input Offset Current IOS -40C < TA < +85C -40C < TA < +125C Input Voltage Range Common-Mode Rejection Ratio Large Signal Voltage Gain OUTPUT CHARACTERISTICS Output Voltage High VCM CMRR AVO VOH VCM = 0 V to 5 V RL = 2 k, VO = 0.5 V to 4.5 V IOUT = 1 mA -40C < TA < +125C IOUT = 10 mA -40C < TA < +125C IOUT = 1 mA -40C < TA < +125C IOUT = 10 mA -40C < TA < +125C Short circuit At 1 MHz, AV = 1 VDD = 2.7 V to 5.0 V -40C < TA < +125C DYNAMIC PERFORMANCE Slew Rate Gain Bandwidth Product Phase Margin NOISE PERFORMANCE Peak-to-Peak Noise Voltage Noise Density Channel Separation Total Harmonic Distortion Plus Noise SR GBP Om en p-p en CS THD+N RL = 2 k 11 27 77 2.3 8 6 -129 -119 0 67 104 4.98 4.90 4.85 4.70 84 116 4.99 4.92 8.4 78 120 5 63 80 1.5 20 40 145 200 0.1 Min Typ 0.6 1.8 0.3 Max 2.5 3.2 7.5 1 50 550 0.5 50 250 5 Unit mV mV V/C pA pA pA pA pA pA V dB dB V V V mV mV mV mV mA dB mA mA V/s MHz Degrees V nV/Hz nV/Hz dB dB Output Voltage Low VOL Output Current Closed-Loop Output Impedance POWER SUPPLY Power Supply Rejection Ratio Supply Current per Amplifier IOUT ZOUT PSRR ISY 1.9 2.25 0.1 Hz to 10 Hz f = 1 kHz f = 10 kHz f = 10 kHz f = 100 kHz V p-p = 0.1 V, RL = 600 , f = 25 kHz, TA = 25C AV = +1 AV = -10 0.010 0.021 % % Rev. 0 | Page 3 of 12 AD8646 VDD = 2.7 V, VCM = VDD/2, TA = +25oC, unless otherwise noted. Table 2. Parameter INPUT CHARACTERISTICS Offset Voltage Offset Voltage Drift Input Bias Current Symbol VOS VOS/T IB Conditions VCM = 1.35 V -40C < TA < +125C -40C < TA < +125C -40C < TA < +85C -40C < TA < +125C Input Offset Current IOS -40C < TA < +85C -40C < TA < +125C Input Voltage Range Common-Mode Rejection Ratio Large Signal Voltage Gain OUTPUT CHARACTERISTICS Output Voltage High Output Voltage Low 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 VCM CMRR AVO VOH VOL IOUT ZOUT PSRR ISY VCM = 0 V to 2.7 V RL = 2 k, VO = 0.5 V to 2.2 V IOUT = 1 mA -40C < TA < +125C IOUT = 1 mA -40C < TA < +125C Short circuit At 1 MHz, AV = 1 VDD = 2.7 V to 5.0 V -40C < TA < +125C SR GBP Om en p-p en CS 0.1 Hz to 10 Hz f = 1 kHz f = 10 kHz f = 10 kHz f = 100 kHz RL = 2 k RL = 10 k 11 26 53 2.3 8 6 -129 -121 0 62 95 2.65 2.60 79 107 2.68 11 63 5 63 80 1.6 25 30 0.1 Min Typ 0.6 1.5 0.2 Max 2.5 3.2 7.0 1 50 550 0.5 50 250 2.7 Unit mV mV V/C pA pA pA pA pA pA V dB dB V V mV mV mA dB mA mA V/s MHz Degrees V nV/Hz nV/Hz dB dB 1.9 2.25 Rev. 0 | Page 4 of 12 AD8646 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 6V GND to VDD 3 V Indefinite -65C to +150C -40C to +125C 300C 150C 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 Resistance Package Type 8-Lead SOIC 8-Lead MSOP JA 121 210 JC 43 45 Unit C/W C/W 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. ESD CAUTION Rev. 0 | Page 5 of 12 AD8646 TYPICAL PERFORMANCE CHARACTERISTICS 300 250 NUMBER OF AMPLIFIERS 200 180 160 VSY = 2.7V VCM = 1.35V TA = 25C 2244 AMPLIFIERS NUMBER OF AMPLIFIERS VSY = 5V VCM = 2.5V TA = 25C 2244 AMPLIFIERS 200 140 120 100 80 60 40 20 150 100 50 06527-002 -1.5 -1.0 -0.5 0 0.5 1.0 1.5 2.0 -1.5 -1.0 -0.5 0 0.5 1.0 1.5 2.0 VOS (mV) VOS (mV) Figure 2. Input Offset Voltage Distribution 35 30 NUMBER OF AMPLIFIERS Figure 5. Input Offset Voltage Distribution 35 30 VSY = 5V -40C < TA < +125C VSY = 2.7V -40C < TA < +125C NUMBER OF AMPLIFIERS 25 20 15 10 5 0 0 1 2 3 4 5 6 7 TCVOS (V/C) 25 20 15 10 5 0 0 1 2 3 4 5 6 7 8 TCVOS (V/C) 06527-003 Figure 3. VOS Drift (TCVOS) Distribution 800 600 400 400 200 200 0 -200 -400 -400 -600 -600 -800 0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 VCM (V) -800 06527-004 Figure 6. VOS Drift (TCVOS) Distribution VSY = 2.7V TA = 25C 1000 800 600 VSY = 5V TA = 25C VOS (V) 0 -200 VOS (V) 0 1 2 VCM (V) 3 4 5 Figure 4. Input Offset Voltage vs. Input Common-Mode Voltage Figure 7. Input Offset Voltage vs. Input Common-Mode Voltage Rev. 0 | Page 6 of 12 06527-007 -1000 06527-006 06527-005 0 -2.0 0 -2.0 AD8646 10000 OUTPUT SATURATION VOLTAGE (mV) OUTPUT SATURATION VOLTAGE (mV) VSY = 2.7V TA = 25C 10000 VSY = 5V TA = 25C 1000 1000 100 VDD - VOH 100 10 VOL 10 VDD - VOH 1 VOL 0.01 0.1 1 10 100 1000 06527-011 1 0.01 0.1 1 10 100 LOAD CURRENT (mA) 06527-008 0.1 0.001 0.1 0.001 LOAD CURRENT (mA) Figure 8. Output Saturation Voltage vs. Load Current 25 OUTPUT SATURATION VOLTAGE (mV) Figure 11. Output Saturation Voltage vs. Load Current 120 OUTPUT SATURATION VOLTAGE (mV) VSY = 2.7V IL = 1mA VSY = 5V VSY - VOH = 10mA 20 VDD - VOH 15 100 80 VOL = 10mA 60 10 VOL 40 5 20 VSY - VOH = 1mA VOL = 1mA -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C) 06527-012 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C) Figure 9. Output Saturation Voltage vs. Temperature 300 VSY = 2.7V TA = 125C INPUT BIAS CURRENT (pA) 06527-009 0 -40 0 -40 Figure 12. Output Saturation Voltage vs. Temperature 300 VSY = 5V TA = 125C 250 INPUT BIAS CURRENT (pA) 250 200 200 150 150 100 100 50 50 06527-010 0.75 1.00 1.25 1.50 1.75 2.00 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 COMMON-MODE VOLTAGE (V) INPUT COMMON-MODE VOLTAGE (V) Figure 10. Input Bias Current vs. Common-Mode Voltage Figure 13. Input Bias Current vs. Common-Mode Voltage Rev. 0 | Page 7 of 12 06527-013 0 0.50 0 0.5 AD8646 80 60 40 GAIN (dB) 180 VSY = 2.7V RL = 1k CL = 10pF 135 TA = 25C 90 PHASE (Degrees) 80 60 40 GAIN (dB) VSY = 5V RL = 1k CL = 10pF TA = 25C 180 135 90 45 0 -45 -90 PHASE (Degrees) 06527-019 06527-018 06527-017 20 0 -20 -40 -60 1 10 100 1k 10k FREQUENCY (kHz) 45 0 -45 -90 20 0 -20 -40 -60 1 10 100 1k 10k FREQUENCY (kHz) Figure 14. Open-Loop Gain and Phase vs. Frequency 60 AV = 100 VSY = 2.7V TA = 25C 60 06527-014 -135 100k -135 100k Figure 17. Open-Loop Gain and Phase vs. Frequency VSY = 5V TA = 25C 40 CLOSED-LOOP GAIN (dB) 40 CLOSED-LOOP GAIN (dB) AV = 100 20 AV = 10 20 AV = 10 0 AV = 1 0 AV = 1 -20 -20 -40 -40 10k 100k 1M 10M 100M 06527-015 -60 1k -60 1k 10k 100k 1M 10M 100M FREQUENCY (Hz) FREQUENCY (Hz) Figure 15. Closed-Loop Gain vs. Frequency 250 VSY = 2.7V TA = 25C 120 Figure 18. Closed-Loop Gain vs. Frequency VSY = 5V TA = 25C 200 AV = 1 ZOUT () ZOUT () 100 AV = 1 80 AV = 10 AV = 100 40 150 60 100 AV = 100 50 AV = 10 20 1 10 100 1k 10k 100k 1M 06527-016 0 FREQUENCY (kHz) 0 1 10 100 1k 10k 100k 1M FREQUENCY (kHz) Figure 16. ZOUT vs. Frequency Figure 19. ZOUT vs. Frequency Rev. 0 | Page 8 of 12 AD8646 100 VSY = 2.7V TA = 25C 100 VSY = 5V TA = 25C 80 80 CMRR (dB) 40 CMRR (dB) 06527-020 60 60 40 20 20 10k 100k 1M 10M 100M 10k 100k 1M 10M 100M FREQUENCY (Hz) FREQUENCY (Hz) Figure 20. CMRR vs. Frequency 100 VSY = 2.7V 90 T = 25C A 80 70 60 PSRR (dB) 100 Figure 23. CMRR vs. Frequency VSY = 5V TA = 25C -PSRR 80 +PSRR PSRR (dB) 60 +PSRR 40 50 40 30 20 10 0 -10 06527-021 -PSRR 20 10k 100k 1M 10M 100M 1 10 100 1k 10k 100k FREQUENCY (Hz) FREQUENCY (kHz) Figure 21. PSRR vs. Frequency 60 VSY = 1.35V TA = 25C -OVERSHOOT 60 VSY = 2.5V TA = 25C Figure 24. PSRR vs. Frequency 50 50 OVERSHOOT (%) +OVERSHOOT 30 OVERSHOOT (%) 40 40 30 +OVERSHOOT 20 -OVERSHOOT 20 10 10 06527-022 1 10 CLOAD (pF) 100 1000 1 10 CLOAD (pF) 100 1000 Figure 22. Small Signal Overshoot vs. Load Capacitance Figure 25. Small Signal Overshoot vs. Load Capacitance Rev. 0 | Page 9 of 12 06527-025 0 0 06527-024 -20 1k 0 06527-023 0 1k 0 1k AD8646 VSY = 2.7V, VCM = 1.35V, VIN = 100mV p-p, TA = 25C, RL = 10k, CL = 100pF VSY = 5V, VCM = 2.5V, VIN = 100mV p-p, TA = 25C, RL = 10k, CL = 100pF (50mV/DIV) 06527-026 (50mV/DIV) (200ns/DIV) (200ns/DIV) Figure 26. 2.7 V Small Signal Transient Response VSY = 2.7V, VIN = 2V p-p, TA = 25C, RL = 10k, CL = 100pF Figure 29. 5 V Small Signal Transient Response VSY = 5V, VIN = 4V p-p, TA = 25C, RL = 10k, CL = 100pF (2V/DIV) 06527-027 (2V/DIV) (200ns/DIV) (200ns/DIV) Figure 27. 2.7 V Large Signal Transient Response 0.08 VSY = 2.5V RL = 600 0.07 AV = 1 TA = 25C 0.06 0.05 0.04 0.03 0.02 0.01 0 10 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 10 Figure 30. 5 V Large Signal Transient Response VSY = 2.5V RL = 600 AV = -10 TA = 25C THD + N (%) THD + N (%) 06527-030 06527-028 06527-029 100 1k FREQUENCY (Hz) 10k 100k 100 1k FREQUENCY (Hz) 10k 100k Figure 28. THD + Noise vs. Frequency Figure 31. THD + Noise vs. Frequency Rev. 0 | Page 10 of 12 06527-031 AD8646 20 18 VOLTAGE NOISE DENSITY (nV/ Hz) VSY = 5V TA = 25C INPUT BIAS CURRENT (pA) 1000 VDD = 5V 16 100 14 12 10 8 6 4 2 06527-032 10 1 1k 10k FREQUENCY (Hz) 100k 45 65 80 105 125 TEMPERATURE (C) Figure 32. Voltage Noise Density vs. Frequency 5.0 4.5 4.0 OUTPUT SWING (V p-p) Figure 35. Input Bias Current vs. Temperature 4000 3500 ISY, BOTH AMPLIFIERS (A) VSY = 5V VIN = 4.9V AV = 1 RL = 10k TA = 25C TA = 25C BOTH AMPS 3000 2500 2000 1500 1000 500 0 0 0.5 1.0 1.5 2.0 2.5 VSY (V) 3.0 3.5 4.0 4.5 5.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 06527-033 1k FREQUENCY (kHz) 10k Figure 33. Maximum Output Swing vs. Frequency VSY = 2.7V TO 5V TA = 25C INPUT REFERRED NOISE (1V/DIV) 2.3V p-p Figure 36. Supply Current vs. Supply Voltage 0 VSY = 5V RL = 2k AV = -100 TA = 25C -20 CHANNEL SEPARATION (dB) -40 -60 -80 VIN = 2V p-p VIN = 0.5V p-p 10k FREQUENCY (Hz) 100k 06527-037 -100 06527-034 M4.00s A CH1 0.00V -120 1k Figure 34. 0.1 Hz to 10 Hz Voltage Noise Figure 37. Channel Separation Rev. 0 | Page 11 of 12 06527-036 0 100 06527-035 0 100 0.1 25 AD8646 OUTLINE DIMENSIONS 5.00 (0.1968) 4.80 (0.1890) 4.00 (0.1574) 3.80 (0.1497) 8 1 5 4 6.20 (0.2441) 5.80 (0.2284) 1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0040) COPLANARITY 0.10 SEATING PLANE 1.75 (0.0688) 1.35 (0.0532) 0.50 (0.0196) 0.25 (0.0099) 8 0 0.25 (0.0098) 0.17 (0.0067) 1.27 (0.0500) 0.40 (0.0157) 45 0.51 (0.0201) 0.31 (0.0122) COMPLIANT TO JEDEC STANDARDS MS-012-A A 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 38. 8-Lead Standard Small Outline Package [SOIC_N] Narrow Body (R-8) Dimensions shown in millimeters and (inches) 3.20 3.00 2.80 3.20 3.00 2.80 8 5 1 5.15 4.90 4.65 4 PIN 1 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 0.23 0.08 COPLANARITY 0.10 COMPLIANT TO JEDEC STANDARDS MO-187-AA Figure 39. 8-Lead Mini Small Outline Package [MSOP] (RM-8) Dimensions shown in millimeters ORDERING GUIDE Model AD8646ARZ 1 AD8646ARZ-REEL1 AD8646ARZ-REEL71 AD8646ARMZ-R21 AD8646ARMZ-REEL1 1 Temperature Range -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 Package Option R-8 R-8 R-8 RM-8 RM-8 012407-A Branding A1V A1V Z = RoHS Compliant Part. (c)2007 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D06527-0-8/07(0) Rev. 0 | Page 12 of 12 |
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