ANALOG DEVICES AD8646

24 MHz Rail-to-Rail Amplifiers with Shutdown Option AD8646/AD8647/AD8648 FEATURES PIN CONFIGURATIONS Offset voltage: 2.5 mV maximum 1 8 OUTA V+ Single-supply operation: 2.7 V to 5.5 V –INA 2 7 OUTB AD8646 TOP VIEW +INA 3 6 –INB Low noise: 8 nV/√Hz (Not to Scale) V– 4 5 +INB Wide bandwidth: 24 MHz Slew rate: 11 V/μs Figure 1. 8-Lead SOIC and MSOP Short-circuit output current: 120 mA OUTA 1 10 V+ Qualified for automotive applications –INA 2 9 OUTB AD8647 No phase reversal +INA 3 8 –INB TOP VIEW Low input bias current: 1 pA (Not to Scale) V– 4 7 +INB Low supply current per amplifier: 2 mA maximum SDA 5 6 SDB Unity gain stable Figure 2. 10-Lead MSOP APPLICATIONS OUTA 1 1 14 14 OUTD Battery-powered instruments –INA 2 2 13 13 –IND Multipole filters +INA 3 3 A AD D864 8648 8 12 12 +IND ADC front ends TO TOP P V VIIE EW W V+ 4 4 11 11 V– (N (Not ot t to o S Sc ca alle e) ) Sensors 5 5 +INB 10 10 +INC Barcode scanners 6 6 9 9 –INB –INC ASIC input or output amplifiers 7 7 8 8 OUTB OUTC Audio amplifiers Photodiode amplifiers Figure 3. 14-Lead SOIC and TSSOP Datapath/mux/switch control GENERAL DESCRIPTION The AD8646 and the AD8647 are the dual, and the AD8648 is AD8647/AD8648 offer high output drive capability, which is the quad, rail-to-rail, input and output, single-supply amplifiers excellent for audio line drivers and other low impedance featuring low offset voltage, wide signal bandwidth, low input applications. The AD8646 and AD8648 are available for voltage, and low current noise. The AD8647 also has a low automotive applications (see the Ordering Guide). power shutdown function. Applications include portable and low powered instrumenta- The combination of 24 MHz bandwidth, low offset, low noise, tion, audio amplification for portable devices, portable phone and very low input bias current makes these amplifiers useful in headsets, barcode scanners, and multipole filters. The ability to swing rail to rail at both the input and output enables designers a wide variety of applications. Filters, integrators, photodiode amplifiers, and high impedance sensors all benefit from the to buffer CMOS ADCs, DACs, ASICs, and other wide output combination of performance features. AC applications benefit swing devices in single-supply systems. from the wide bandwidth and low distortion. TheAD8646/ 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Fax: 781.461.3113 ©2006–2010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 06527-002 06527-001 06527-003 AD8646/AD8647/AD8648 TABLE OF CONTENTS Features .............................................................................................. 1  ESD Caution...................................................................................6  Applications ....................................................................................... 1  Typical Performance Characteristics ..............................................7  Pin Configurations ........................................................................... 1  Theory of Operation ...................................................................... 15  General Description ......................................................................... 1  Power-Down Operation ............................................................ 15  Revision History ............................................................................... 2  Multiplexing Operation ............................................................. 15  Specif ica t ions ..................................................................................... 3  Outline Dimensions ....................................................................... 16  Absolute Maximum Ratings ............................................................ 6  Ordering Guide .......................................................................... 18  Thermal Resistance ...................................................................... 6  REVISION HISTORY 4/10—Rev. C to Rev. D Revision History: AD8648 Changes to Features Section and General Description Section . 1 10/07—Rev. A to Rev. B Updated Outline Dimensions ....................................................... 16 Combined with AD8646 ................................................... Universal Changes to Ordering Guide Section ............................................ 18 Added AD8647 ................................................................... Universal Revision History: AD8646/AD8647/AD8648 Deleted Figure 7 ................................................................................. 6 Deleted Figure 11 ............................................................................... 7 2/09—Rev. B to Rev. C Deleted Figure 16 and Figure 17 ..................................................... 8 Change to Supply Current Shutdown Mode (AD8647 Only) Deleted Figure 24 ............................................................................... 9 Parameter, Table 1 ............................................................................. 3 Deleted Figure 27, Figure 28, Figure 31, and Figure 32 ............ 10 Change to Supply Current Shutdown Mode (AD8647 Only) Parameter, Table 2 ............................................................................. 5 6/07—Rev. 0 to Rev. A Added Figure 50; Renumbered Sequentially .............................. 15 Changes to General Description ..................................................... 1 Updated Outline Dimensions ....................................................... 16 Updated Outline Dimensions ....................................................... 12 Changes to Ordering Guide .......................................................... 18 Changes to Ordering Guide .......................................................... 12 10/07—Revision B: Initial Combined Version 1/06—Revision 0: Initial Version Revision History: AD8646 10/07—Rev. 0 to Rev. B Combined with AD8648 .................................................... U nivers al Added AD8647 ................................................................... Universal Deleted Figure 4 and Figure 7 ......................................................... 7 Deleted Figure 33 ............................................................................ 11 8/07—Revision 0: Initial Version Rev. D | Page 2 of 20 AD8646/AD8647/AD8648 SPECIFICATIONS o VSY = 5 V, VCM = VSY/2, TA = +25 C, unless otherwise noted. Table 1. Parameter Symbol Conditions Min Typ Max Unit INPUT CHARACTERISTICS Offset Voltage V V = 0 V to 5 V 0.6 2.5 mV OS CM −40°C < TA < +125°C 3.2 mV Offset Voltage Drift ΔVOS/ΔT −40°C < TA < +125°C 1.8 7.5 μV/°C Input Bias Current IB 0.3 1 pA −40°C < T < +85°C 50 pA A −40°C < T < +125°C 550 pA A Input Offset Current I 0.1 0.5 pA OS −40°C < TA < +85°C 50 pA −40°C < TA < +125°C 250 pA Input Voltage Range V 0 5 V CM Common-Mode Rejection Ratio CMRR V = 0 V to 5 V 67 84 dB CM Large Signal Voltage Gain A R = 2 kΩ, V = 0.5 V to 4.5 V 104 116 dB VO L O Input Capacitance Differential CDIFF 2.5 pF Common Mode CCM 6.7 pF OUTPUT CHARACTERISTICS Output Voltage High VOH IOUT = 1 mA 4.98 4.99 V −40°C < T < +125°C 4.90 V A IOUT = 10 mA 4.85 4.92 V −40°C < TA < +125°C 4.70 V Output Voltage Low VOL IOUT = 1 mA 8.4 20 mV −40°C < T < +125°C 40 mV A I = 10 mA 78 145 mV OUT −40°C < T < +125°C 200 mV A Output Current Isc Short circuit ±120 mA Closed-Loop Output Impedance ZOUT At 1 MHz, AV = 1 5 Ω POWER SUPPLY Power Supply Rejection Ratio PSRR VSY = 2.7 V to 5.5 V 63 80 dB Supply Current per Amplifier ISY 1.5 2.0 mA −40°C < TA < +125°C 2.5 mA Supply Current Shutdown Mode I Both amplifiers shut down, 10 nA SD (AD8647 Only) V and V = 0 V IN_SDA IN_SDB −40°C < TA < +125°C 1 μA SHUTDOWN INPUTS (AD8647) Logic High Voltage (Enabled) V −40°C < T < +125°C +2.0 V INH A Logic Low Voltage (Power-Down) VINL −40°C < TA < +125°C +0.8 V Logic Input Current (Per Pin) IIN −40°C < TA < +125°C 1 μA Output Pin Leakage Current −40°C < TA < +125°C (shutdown active) 1 nA DYNAMIC PERFORMANCE Slew Rate SR RL = 2 kΩ 11 V/μs Gain Bandwidth Product GBP 24 MHz Phase Margin Ø 74 Degrees m Settling Time t To 0.1% 0.5 μs s Amplifier Turn-On Time (AD8647) ton 25°C, AV = 1, RL = 1 kΩ (see Figure 44) 1 μs Amplifier Turn-Off Time (AD8647) toff 25°C, AV = 1, RL = 1 kΩ (see Figure 45) 1 μs Rev. D | Page 3 of 20 AD8646/AD8647/AD8648 Parameter Symbol Conditions Min Typ Max Unit NOISE PERFORMANCE Peak-to-Peak Noise en p-p 0.1 Hz to 10 Hz 2.3 μV Voltage Noise Density en f = 1 kHz 8 nV/√Hz f = 10 kHz 6 nV/√Hz Channel Separation CS f = 10 kHz −115 dB f = 100 kHz −110 dB Total Harmonic Distortion Plus Noise THD + N V p-p = 0.1 V, RL = 600 Ω, f = 25 kHz, TA = 25°C AV = +1 0.010 % A = −10 0.021 % V Rev. D | Page 4 of 20 AD8646/AD8647/AD8648 o V = 2.7 V, V = V /2, T = +25 C, unless otherwise noted. SY CM SY A Table 2. Parameter Symbol Conditions Min Typ Max Unit INPUT CHARACTERISTICS Offset Voltage V V = 0 V to 2.7 V 0.6 2.5 mV OS CM −40°C < T < +125°C 3.2 mV A Offset Voltage Drift ΔV /ΔT −40°C < T < +125°C 1.8 7.0 μV/°C OS A Input Bias Current IB 0.2 1 pA −40°C < TA < +85°C 50 pA −40°C < TA < +125°C 550 pA Input Offset Current I 0.1 0.5 pA OS −40°C < T < +85°C 50 pA A −40°C < T < +125°C 250 pA A Input Voltage Range VCM 0 2.7 V Common-Mode Rejection Ratio CMRR VCM = 0 V to 2.7 V 62 79 dB Large Signal Voltage Gain AVO RL = 2 kΩ, VO = 0.5 V to 2.2 V 95 102 dB Input Capacitance Differential C 2.5 pF DIFF Common Mode CCM 7.8 pF OUTPUT CHARACTERISTICS Output Voltage High V I = 1 mA 2.65 2.68 V OH OUT −40°C < TA < +125°C 2.60 V Output Voltage Low VOL IOUT = 1 mA 11 25 mV −40°C < TA < +125°C 30 mV Output Current I Short circuit ±63 mA sc Closed-Loop Output Impedance Z At 1 MHz, A = 1 5 Ω OUT V POWER SUPPLY Power Supply Rejection Ratio PSRR V = 2.7 V to 5.5 V 63 80 dB SY Supply Current per Amplifier I 1.6 2.0 mA SY −40°C < TA < +125°C 2.5 mA Supply Current Shutdown Mode ISD Both amplifiers shut down, 10 nA (AD8647 Only) VIN_SDA and VIN_SDB = 0 V −40°C < TA < +125°C 1 μA SHUTDOWN INPUTS (AD8647) Logic High Voltage (Enabled) VINH −40°C < TA < +125°C +2.0 V Logic Low Voltage (Power-Down) V −40°C < T < +125°C +0.8 V INL A Logic Input Current (Per Pin) I −40°C < T < +125°C 1 μA IN A Output Pin Leakage Current −40°C < T < +125°C (shutdown active) 1 nA A DYNAMIC PERFORMANCE Slew Rate SR R = 2 kΩ 11 V/μs L Gain Bandwidth Product GBP 24 MHz Phase Margin Øm 53 Degrees  Settling Time ts To 0.1% 0.3 μs Amplifier Turn-On Time (AD8647) ton 25°C, AV = 1, RL = 1 kΩ (see Figure 41) 1.2 μs Amplifier Turn-Off Time (AD8647) t 25°C, A = 1, R = 1 kΩ (see Figure 42) 1 μs off V L NOISE PERFORMANCE Peak-to-Peak Noise e p-p 0.1 Hz to 10 Hz 2.3 μV n Voltage Noise Density e f = 1 kHz 8 nV/√Hz n f = 10 kHz 6 nV/√Hz Channel Separation CS f = 10 kHz −115 dB f = 100 kHz −110 dB Rev. D | Page 5 of 20 AD8646/AD8647/AD8648 ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE Table 3. Parameter Rating θ is specified for the worst-case conditions, that is, a device JA soldered in a circuit board for surface-mount packages. Supply Voltage 6 V Input Voltage GND to V SY Table 4. Thermal Resistance Differential Input Voltage ±3 V Package Type θ θ Unit JA JC Output Short Circuit to GND Indefinite 8-Lead SOIC_N 125 43 °C/W Storage Temperature Range −65°C to +150°C 8-Lead MSOP 210 45 °C/W Operating Temperature Range −40°C to +125°C 10-Lead MSOP 200 44 °C/W Lead Temperature (Soldering 60 sec) 300°C 14-Lead SOIC_N 120 36 °C/W Junction Temperature 150°C 14-Lead TSSOP 180 35 °C/W Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress ESD CAUTION 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. Rev. D | Page 6 of 20 AD8646/AD8647/AD8648 TYPICAL PERFORMANCE CHARACTERISTICS 300 200 V = 2.7V V = 5V SY SY V = 1.35V V = 2.5V CM 180 CM T = 25°C T = 25°C A A 250 2244 AMPLIFIERS 2244 AMPLIFIERS 160 140 200 120 150 100 80 100 60 40 50 20 0 0 –2.0 –1.5 –1.0 –0.5 0 0.5 1.0 1.5 2.0 –2.0 –1.5 –1.0 –0.5 0 0.5 1.0 1.5 2.0 V (mV) V (mV) OS OS Figure 4. Input Offset Voltage Distribution Figure 7. Input Offset Voltage Distribution 35 35 V = 2.7V V = 5V SY SY –40°C < T < +125°C –40°C < T < +125°C A A 30 30 25 25 20 20 15 15 10 10 5 5 0 0 07 1 2 3 4 5 6 08 1 2 3 4 5 6 7 TCV (µV/°C) TCV (µV/°C) OS OS Figure 5. V Drift (TCV ) Distribution Figure 8. V Drift (TCV ) Distribution OS OS OS OS 2500 2500 V = 2.7V V =5V SY SY T = 25°C 2000 A 2000 T =25°C A 1500 1500 1000 1000 500 500 0 0 –500 –500 –1000 –1000 –1500 –1500 –2000 –2000 –2500 –2500 01 2 3 4 5 03 0.5 1.0 1.5 2.0 2.5.0 INPUT COMMON-MODE VOLTAGE (V) INPUT COMMON-MODE VOLTAGE (V) Figure 6. Input Offset Voltage vs. Input Common-Mode Voltage Figure 9. Input Offset Voltage vs. Input Common-Mode Voltage Rev. D | Page 7 of 20 INPUT OFFSET VOLTAGE (µV) NUMBER OF AMPLIFIERS NUMBER OF AMPLIFIERS 06527-005 06527-004 06527-006 INPUTOFFSETVOLTAGE (µV) NUMBER OF AMPLIFIERS NUMBER OF AMPLIFIERS 06527-009 06527-008 06527-007 AD8646/AD8647/AD8648 10000 10000 V = 2.7V V = 5V SY SY T = 25°C T = 25°C A A 1000 1000 V – V SY OH 100 100 10 10 V OL V – V SY OH 1 1 V OL 0.1 0.1 0.001 0.01 0.1 1 10 100 0.001 0.01 0.1 1 10 100 1000 LOAD CURRENT (mA) LOAD CURRENT (mA) Figure 10. Output Saturation Voltage vs. Load Current Figure 13. Output Saturation Voltage vs. Load Current 25 120 V = 2.7V V = 5V SY SY I = 1mA L V – V = 10mA SY OH 100 20 V – V 80 SY OH V = 10mA 15 OL 60 10 V OL 40 5 20 V – V = 1mA SY OH V = 1mA OL 0 0 –40 –25 –10 5 20 35 50 65 80 95 110 125 –40 –25 –10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) TEMPERATURE (°C) Figure 11. Output Saturation Voltage vs. Temperature Figure 14. Output Saturation Voltage vs. Temperature 300 300 V = 2.7V V = 5V SY SY T = 125°C T = 125°C A A 250 250 200 200 150 150 100 100 50 50 0 0 0.50 0.75 1.00 1.25 1.50 1.75 2.00 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 COMMON-MODE VOLTAGE (V) COMMON-MODE VOLTAGE (V) Figure 12. Input Bias Current vs. Common-Mode Voltage Figure 15. Input Bias Current vs. Common-Mode Voltage Rev. D | Page 8 of 20 INPUT BIAS CURRENT (pA) OUTPUT SATURATION VOLTAGE (mV) OUTPUT SATURATION VOLTAGE (mV) 06527-011 06527-010 06527-012 OUTPUT SATURATION VOLTAGE (mV) OUTPUT SATURATION VOLTAGE (mV) INPUT BIAS CURRENT (pA) 06527-015 06527-014 06527-013 AD8646/AD8647/AD8648 80 0 80 0 V = 5V V = 2.7V SY SY R = 1kΩ R = 1kΩ L L C = 10pF L C = 10pF L 60 60 45 45 PHASE 40 90 40 90 Ф = 52° M 20 135 20 135 Ф = 74° M GAIN 0 180 0 180 –20 225 –20 225 –40 270 –40 270 10k 100k 1M 10M 100M 10k 100k 1M 10M 100M FREQUENCY (Hz) FREQUENCY (Hz) Figure 16. Open-Loop Gain and Phase vs. Frequency Figure 19. Open-Loop Gain and Phase vs. Frequency 60 60 V = 2.7V V = 5V SY SY T = 25°C T = 25°C A A A = 100 A = 100 V V 40 40 A = 10 A = 10 V V 20 20 A = 1 A = 1 V V 0 0 –20 –20 –40 –40 –60 –60 1k 10k 100k 1M 10M 100M 1k 10k 100k 1M 10M 100M FREQUENCY (Hz) FREQUENCY (Hz) Figure 17. Closed-Loop Gain vs. Frequency Figure 20. Closed-Loop Gain vs. Frequency 250 120 V = 2.7V V = 5V SY SY T = 25°C T = 25°C A A 100 200 A = 1 V 80 A = 1 V 150 A = 10 V 60 100 A = 100 V A = 10 V 40 A = 100 V 50 20 0 0 1 10 100 1k 10k 100k 1M 1 10 100 1k 10k 100k 1M FREQUENCY (kHz) FREQUENCY (kHz) Figure 18. Z vs. Frequency Figure 21. Z vs. Frequency OUT OUT Rev. D | Page 9 of 20 OPEN-LOOP GAIN (dB) CLOSED-LOOP GAIN (dB) Z (Ω) OUT 06527-018 06527-017 OPEN-LOOP PHASE SHIFT (Degrees) 06527-016 OPEN-LOOP GAIN (dB) CLOSED-LOOP GAIN (dB) Z (Ω) OUT OPEN-LOOP PHASE SHIFT (Degrees) 06527-021 06527-020 06527-019 AD8646/AD8647/AD8648 100 100 V = 2.7V V = 5V SY SY T = 25°C T = 25°C A A 80 80 60 60 40 40 20 20 0 0 1k 10k 100k 1M 10M 100M 1k 10k 100k 1M 10M 100M FREQUENCY (Hz) FREQUENCY (Hz) Figure 22. CMRR vs. Frequency Figure 25. CMRR vs. Frequency 100 100 V = 2.7V V = 5V SY PSRR+ SY PSRR+ T = 25°C T = 25°C A A 80 80 PSRR– 60 PSRR– 60 40 40 20 20 0 0 1k 10k 100k 1M 10M 1k 10k 100k 1M 10M FREQUENCY (Hz) FREQUENCY (Hz) Figure 26. PSRR vs. Frequency Figure 23. PSRR vs. Frequency 60 70 V = 5V V = ±1.35V SY SY R = 10kΩ T = 25°C L A T = 25°C 60 A 50 –OS 50 +OS 40 40 30 OS+ 30 OS– 20 20 10 10 0 0 11 10 100000 10 100 1000 C (pF) C (pF) LOAD LOAD Figure 24. Overshoot vs. Load Capacitance Figure 27. Overshoot vs. Load Capacitance Rev. D | Page 10 of 20 OVERSHOOT (%) CMRR (dB) PSRR (dB) 06527-023 06527-024 06527-022 CMRR (dB) OVERSHOOT (%) PSRR (dB) 06527-027 06527-026 06527-025 AD8646/AD8647/AD8648 V = 2.7V, V = 1.35V, V = 100mV p-p, V = 5V, V = 2.5V, V = 100mV p-p, SY CM IN SY CM IN T = 25°C, R = 10kΩ, C = 100pF T = 25°C, R = 10kΩ, C = 100pF A L L A L L (200ns/DIV) (200ns/DIV) Figure 28. Small-Signal Transient Response Figure 31. Small-Signal Transient Response V = 2.7V, V = 2V p-p, V = 5V, V = 4V p-p, SY IN SY IN T = 25°C, R = 10kΩ, C = 100pF T = 25°C, R = 10kΩ, C = 100pF A L L A L L (200ns/DIV) (200ns/DIV) Figure 29. Large-Signal Transient Response Figure 32. Large-Signal Transient Response 0.08 0.08 V = ±2.5V V = ±2.5V SY SY R = 600Ω R = 600Ω L L 0.07 0.07 A = 1 A = –10 V V T = 25°C T = 25°C A A 0.06 0.06 0.05 0.05 0.04 0.04 0.03 0.03 0.02 0.02 0.01 0.01 0 0 10 100 1k 10k 100k 10 100 1k 10k 100k FREQUENCY (Hz) FREQUENCY (Hz) Figure 30. THD + Noise vs. Frequency Figure 33. THD + Noise vs. Frequency Rev. D | Page 11 of 20 THD + N (%) (2V/DIV) (50mV/DIV) 06527-029 06527-028 06527-030 THD + N (%) (2V/DIV) (50mV/DIV) 06527-032 06527-031 06527-033 AD8646/AD8647/AD8648 1 V = 2.7V TO 5V SY T = 25°C A 0.1 0.01 0.001 V = 5V SY A = 1 V BW = 30kHz R = 100kΩ L f = 1kHz 0.0001 0.001 0.01 0.1 1 TIME (1s/DIV) OUTPUT AMPLITUDE (V rms) Figure 34. 0.1 Hz to 10 Hz Voltage Noise Figure 37. THD + Noise vs. Output Amplitude 1000 1000 V = 5V V = 2.7V TO 5V SY SY T = 25°C A 100 100 10 10 1 1 0.1 10 100 1k 10k 25 45 65 80 105 125 TEMPERATURE (°C) FREQUENCY (Hz) Figure 35. Voltage Noise Density vs. Frequency Figure 38. Input Bias Current vs. Temperature 2.5 5.0 T = 25°C A V = 5V SY V = 4.9V 4.5 IN A = 1 V R = 10kΩ 2.0 4.0 L T = 25°C A 3.5 1.5 3.0 2.5 1.0 2.0 1.5 1.0 0.5 0.5 0 0 05 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5.0 100 1k 10k FREQUENCY (kHz) SUPPLY VOLTAGE (V) Figure 36. Supply Current per Amplifier vs. Supply Voltage Figure 39. Maximum Output Swing vs. Frequency Rev. D | Page 12 of 20 VOLTAGE NOISE DENSITY (nV/√Hz) SUPPLY CURRENT PER AMPLIFIER (mA) VOLTAGE (1µV/DIV) 06527037 06527-039 06527-035 OUTPUT SWING (V p-p) INPUT BIAS CURRENT (pA) THD + N (%) 06527-034 06527-036 06527-038 AD8646/AD8647/AD8648 4.0 0 V = 5V SY R1 V = V /2 OUT SY CS (dB) = 20 log (V /100 = V ) 20Ω R = 2kΩ OUT IN L 3.5 A = –100 V V+ V– –20 R2 T = 25°C A 200Ω 3 U1 U2 6 3.0 V+ 5 + V– V 2 V– 7 IN V+ –40 R3 0 – 2.5 2kΩ 0 0 V– V+ 0 V = 2.7V SY 2.0 –60 V = 5V SY 1.5 –80 1.0 V = 2V p-p IN –100 0.5 V = 0.5V p-p IN 0 –120 –40 –20 0 20406080 100 120 1k 10k 100k FREQUENCY (Hz) TEMPERATURE (°C) Figure 40. Supply Current per Amplifier vs. Temperature Figure 43. Channel Separation V = 5V SY SHUTDOWN PIN SHUTDOWN PIN R = 1kΩ L A = 1 V V = 2.7V SY T = 25°C A R = 1kΩ L A = 1 V T = 25°C A AMPLIFIER OUTPUT AMPLIFIER OUTPUT TIME (200ns/DIV) TIME (200ns/DIV) Figure 41. Turn-On Time Figure 44. Turn-On Time V = 2.7V V = 5V SY SY R = 1kΩ R = 1kΩ L L A = 1 A = 1 V V T = 25°C T = 25°C A A SHUTDOWN PIN SHUTDOWN PIN AMPLIFIER OUTPUT AMPLIFIER OUTPUT TIME (200ns/DIV) TIME (200ns/DIV) Figure 45. Turn-Off Time Figure 42. Turn-Off Time Rev. D | Page 13 of 20 SUPPLY CURRENT PER AMPLIFIER (mA) VOLTAGE (1V/DIV) VOLTAGE (1V/DIV) 06527-046 06527-045 06527-040 CHANNEL SEPARATION (dB) VOLTAGE (1V/DIV) VOLTAGE (1V/DIV) 06527-044 06527-043 06527-042 AD8646/AD8647/AD8648 100 100 V = 2.7V V = 5V SY SY 10 10 1 1 0.1 0.1 0.01 0.01 –40 –25 –10 5 20 35 50 65 80 95 110 125 –40 –25 –10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) TEMPERATURE (°C) Figure 46. Supply Current with Op-Amp Shutdown vs. Temperature Figure 47. Supply Current with Op-Amp Shutdown vs. Temperature Rev. D | Page 14 of 20 I (nA) SY 06527-048 I (nA) SY 06527-047 AD8646/AD8647/AD8648 THEORY OF OPERATION POWER-DOWN OPERATION The shutdown function of the AD8647 is referenced to the 2V negative supply voltage of the operational amplifier. A logic 1V level high (> 2.0 V) enables the device, while a logic level low (< 0.8 V) disables the device and places the output in a high 0V impedance condition. Several outputs can be wire-OR’ed, thus eliminating a multiplexer. The logic input is a high impedance CMOS input. If dual or split supplies are used, the logic signals must be properly referred to the negative supply voltage. 5V MULTIPLEXING OPERATION 0V Because each op amp has a separate logic input enable pin, the outputs can be connected together if it can be guaranteed that TIME (200µs/DIV) only one op amp is active at any time. By connecting the op amps Figure 49. Switching Waveforms as shown in Figure 48, a multiplexer can be eliminated. With the reasonably short turn-on and turn-off times, low frequency signal paths can be smoothly selected. The turn-off time is 80 slightly faster than the turn-on time so, even when using 70 sections from two different packages, the overlap is less than 60 300 nanoseconds. 50 1/2 AD8647 8 40 9 7 30 6 5kHz 20 5V V = 5V SY 10 1/2 V = 2.7V SY AD8647 0 2 10 1 –10 3 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 5 V AND V (V) IN_SDA IN_SDB 4 13kHz Figure 50. Supply Current Shutdown Mode, AD8647 1 2 2kHz Figure 48. AD8647 Output Switching Rev. D | Page 15 of 20 06527-049 SUPPLY CURRENT (µA) 06527-050 06527-051 AD8646/AD8647/AD8648 OUTLINE DIMENSIONS 5.00 (0.1968) 4.80 (0.1890) 85 6.20 (0.2441) 4.00 (0.1574) 1 5.80 (0.2284) 3.80 (0.1497) 4 0.50 (0.0196) 1.27 (0.0500) 45° BSC 1.75 (0.0688) 0.25 (0.0099) 1.35 (0.0532) 0.25 (0.0098) 8° 0.10 (0.0040) 0° 0.51 (0.0201) COPLANARITY 1.27 (0.0500) 0.10 0.31 (0.0122) 0.25 (0.0098) SEATING 0.40 (0.0157) PLANE 0.17 (0.0067) 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. Figure 51. 8-Lead Standard Small Outline Package [SOIC_N] Narrow Body (R-8) Dimensions shown in millimeters and (inches) 3.20 3.00 2.80 8 5 5.15 3.20 4.90 3.00 4.65 1 2.80 4 PIN 1 IDENTIFIER 0.65 BSC 0.95 15° MAX 0.85 1.10 MAX 0.75 0.80 0.15 0.23 6° 0.55 0.40 0.05 0.09 0° 0.40 0.25 COPLANARITY 0.10 COMPLIANT TO JEDEC STANDARDS MO-187-AA Figure 52. 8-Lead Mini Small Outline Package [MSOP] (RM-8) Dimensions shown in millimeters Rev. D | Page 16 of 20 100709-B 012407-A AD8646/AD8647/AD8648 3.10 3.00 2.90 10 6 5.15 3.10 4.90 3.00 4.65 1 2.90 5 PIN 1 IDENTIFIER 0.50 BSC 0.95 15° MAX 0.85 1.10 MAX 0.75 0.70 0.15 0.23 6° 0.55 0.30 0.05 0.13 0° 0.40 0.15 COPLANARITY 0.10 COMPLIANT TO JEDEC STANDARDS MO-187-BA Figure 53. 10-Lead Mini Small Outline Package [MSOP] (RM-10) Dimensions shown in millimeters 5.10 5.00 4.90 14 8 4.50 6.40 4.40 BSC 4.30 1 7 PIN 1 0.65 BSC 1.05 1.20 1.00 MAX 0.20 0.80 0.09 0.75 0.15 8° 0.60 SEATING 0° 0.05 0.45 0.30 PLANE COPLANARITY 0.19 0.10 COMPLIANT TO JEDEC STANDARDS MO-153-AB-1 Figure 54. 14-Lead Thin Shrink Small Outline Package [TSSOP] (RU-14) Dimensions shown in millimeters Rev. D | Page 17 of 20 091709-A 061908-A AD8646/AD8647/AD8648 8.75 (0.3445) 8.55 (0.3366) 8 14 6.20 (0.2441) 4.00 (0.1575) 1 5.80 (0.2283) 3.80 (0.1496) 7 1.27 (0.0500) 0.50 (0.0197) 45° BSC 0.25 (0.0098) 1.75 (0.0689) 0.25 (0.0098) 1.35 (0.0531) 8° 0.10 (0.0039) 0° COPLANARITY SEATING 1.27 (0.0500) 0.51 (0.0201) 0.10 PLANE 0.25 (0.0098) 0.40 (0.0157) 0.31 (0.0122) 0.17 (0.0067) 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 55. 14-Lead Standard Small Outline Package [SOIC_N] Narrow Body (R-14) Dimensions shown in millimeters and (inches) ORDERING GUIDE 1, 2 Model Temperature Range Package Description Package Option Branding AD8646ARZ −40°C to +125°C 8-Lead SOIC_N R-8 AD8646ARZ-REEL −40°C to +125°C 8-Lead SOIC_N R-8 AD8646ARZ-REEL7 −40°C to +125°C 8-Lead SOIC_N R-8 AD8646ARMZ −40°C to +125°C 8-Lead MSOP RM-8 A1V AD8646ARMZ-REEL −40°C to +125°C 8-Lead MSOP RM-8 A1V AD8646WARZ-RL −40°C to +125°C 8-Lead SOIC_N R-8 AD8646WARZ-R7 −40°C to +125°C 8-Lead SOIC_N R-8 AD8646WARMZ-RL −40°C to +125°C 8-Lead MSOP RM-8 A1V AD8646WARMZ-R7 −40°C to +125°C 8-Lead MSOP RM-8 A1V AD8647ARMZ −40°C to +125°C 10-Lead MSOP RM-10 A1W AD8647ARMZ-REEL −40°C to +125°C 10-Lead MSOP RM-10 A1W AD8648ARZ −40°C to +125°C 14-Lead SOIC_N R-14 AD8648ARZ-REEL −40°C to +125°C 14-Lead SOIC_N R-14 AD8648ARZ-REEL7 −40°C to +125°C 14-Lead SOIC_N R-14 AD8648ARUZ −40°C to +125°C 14-Lead TSSOP RU-14 AD8648ARUZ-REEL −40°C to +125°C 14-Lead TSSOP RU-14 AD8648WARUZ −40°C to +125°C 14-Lead TSSOP RU-14 AD8648WARUZ-RL −40°C to +125°C 14-Lead TSSOP RU-14 1 Z = RoHS Compliant Part 2 W = Qualified for Automotive Applications. Rev. D | Page 18 of 20 060606-A AD8646/AD8647/AD8648 NOTES Rev. D | Page 19 of 20 AD8646/AD8647/AD8648 NOTES ©2006–2010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D06527-0-4/10(D) Rev. D | Page 20 of 20