Low Cost, High Speed, Rail-to-Rail, Output Op Amps ADA4851-1/ADA4851-2/ADA4851-4 PIN CONFIGURATIONS High speed 130 MHz, −3 dB bandwidth 375 V/μs slew rate 55 ns settling time to 0.1% Excellent video specifications 0.1 dB flatness: 11 MHz Differential gain: 0.08% Differential phase: 0.09° Fully specified at +3 V, +5 V, and ±5 V supplies Rail-to-rail output Output swings to within 60 mV of either rail Low voltage offset: 0.6 mV Wide supply range: 3 V to 10 V Low power: 2.5 mA/amplifier Power-down mode Available in space-saving packages 6-lead SOT-23, 14-lead TSSOP, and 8-lead MSOP ADA4851-1 6 +VS –VS 2 5 POWER DOWN +IN 3 4 –IN VOUT 1 05143-001 FEATURES TOP VIEW (Not to Scale) Figure 1. ADA4851-1, 6-Lead SOT-23 (RJ-6) ADA4851-2 8 +VS –IN1 2 7 OUT +IN1 3 6 –IN2 –VS 4 5 +IN2 05143-058 OUT1 1 TOP VIEW (Not to Scale) Figure 2. ADA4851-2, 8-Lead MSOP (RM-8) VOUT 1 1 –IN 4 +IN 1 3 12 +IN 4 Consumer video Professional video Video switchers Active filters ADA4851-4 TOP VIEW (Not to Scale) 11 –VS +IN 2 5 10 +IN 3 –IN 2 6 9 –IN 3 8 VOUT 3 +VS 4 VOUT 2 7 05143-054 13 –IN 1 APPLICATIONS 14 VOUT 4 2 Figure 3. ADA4851-4, 14-Lead TSSOP (RU-14) GENERAL DESCRIPTION With their combination of low price, excellent differential gain (0.08%), differential phase (0.09º), and 0.1 dB flatness out to 11 MHz, these amplifiers are ideal for consumer video applications. 4 G = +1 VS = 5V RL = 1kΩ CL = 5pF 3 2 1 0 –1 –2 –3 –4 –5 –6 1 10 100 FREQUENCY (MHz) 1k 05143-004 The ADA4851 family is designed to operate at supply voltages as low as +3 V and up to ±5 V. These parts provide true singlesupply capability, allowing input signals to extend 200 mV below the negative rail and to within 2.2 V of the positive rail. On the output, the amplifiers can swing within 60 mV of either supply rail. The ADA4851 family is designed to work over the extended temperature range (−40°C to +125°C). CLOSED-LOOP GAIN (dB) The ADA4851-1 (single)/ADA4851-2 (dual)/ADA4851-4 (quad) are low cost, high speed, voltage feedback rail-to-rail output op amps. Despite their low price, these parts provide excellent overall performance and versatility. The 130 MHz, −3 dB bandwidth and high slew rate make these amplifiers well suited for many general-purpose, high speed applications. Figure 4. Small Signal Frequency Response 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. 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 © 2006 Analog Devices, Inc. All rights reserved. ADA4851-1/ADA4851-2/ADA4851-4 TABLE OF CONTENTS Features .............................................................................................. 1 Thermal Resistance .......................................................................6 Applications....................................................................................... 1 ESD Caution...................................................................................6 Pin Configurations ........................................................................... 1 Typical Performance Characteristics ..............................................7 General Description ......................................................................... 1 Circuit Description......................................................................... 13 Revision History ............................................................................... 2 Headroom Considerations........................................................ 13 Specifications..................................................................................... 3 Overload Behavior and Recovery ............................................ 14 Specifications with +3 V Supply................................................. 3 Single-Supply Video Amplifier................................................. 15 Specifications with +5 V Supply................................................. 4 Video Reconstruction Filter...................................................... 15 Specifications with ±5 V Supply................................................. 5 Outline Dimensions ....................................................................... 16 Absolute Maximum Ratings............................................................ 6 Ordering Guide .......................................................................... 17 REVISION HISTORY 4/06—Rev. C to Rev. D Added Video Reconstruction Filter Section ............................... 15 5/05—Rev. B to Rev. C Changes to General Description .................................................... 1 Changes to Input Section............................................................... 14 4/05—Rev. A to Rev. B Added ADA4851-2.............................................................Universal Added 8-Lead MSOP .........................................................Universal Changes to Features.......................................................................... 1 Changes to General Description .................................................... 1 Changes to Table 1............................................................................ 3 Changes to Table 2............................................................................ 4 Changes to Table 3............................................................................ 5 Changes to Table 4 and Figure 5..................................................... 6 Changes to Figure 12, Figure 15, and Figure 17 ........................... 8 Changes to Figure 18........................................................................ 9 Changes to Figure 28 Caption....................................................... 10 Changes to Figure 33...................................................................... 11 Changes to Figure 36 and Figure 38............................................. 12 Added Figure 39.............................................................................. 12 Changes to Circuit Description Section ...................................... 13 Changes to Headroom Considerations Section ......................... 13 Changes to Overload Behavior and Recovery Section .............. 14 Added Single-Supply Video Amplifier Section .......................... 15 Updated Outline Dimensions ....................................................... 16 Changes to Ordering Guide .......................................................... 17 1/05—Rev. 0 to Rev. A Added ADA4851-4.............................................................Universal Added 14-Lead TSSOP ......................................................Universal Changes to Features ..........................................................................1 Changes to General Description .....................................................1 Changes to Figure 3...........................................................................1 Changes to Specifications.................................................................3 Changes to Figure 4...........................................................................6 Changes to Figure 8...........................................................................7 Changes to Figure 11.........................................................................8 Changes to Figure 22.........................................................................9 Changes to Figure 23, Figure 24, and Figure 25 ......................... 10 Changes to Figure 27 and Figure 28............................................. 10 Changes to Figure 29, Figure 30, and Figure 31 ......................... 11 Changes to Figure 34...................................................................... 11 Added Figure 37 ............................................................................. 12 Changes to Ordering Guide .......................................................... 15 Updated Outline Dimensions....................................................... 15 10/04—Revision 0: Initial Version Rev. D | Page 2 of 20 ADA4851-1/ADA4851-2/ADA4851-4 SPECIFICATIONS SPECIFICATIONS WITH +3 V SUPPLY TA = 25°C, RF = 0 Ω for G = +1, RF = 1 kΩ for G > +1, RL = 1 kΩ, unless otherwise noted. Table 1. Parameter DYNAMIC PERFORMANCE −3 dB Bandwidth Bandwidth for 0.1 dB Flatness Slew Rate Settling Time to 0.1% NOISE/DISTORTION PERFORMANCE Harmonic Distortion (dBc) HD2/HD3 Input Voltage Noise Input Current Noise Differential Gain Differential Phase Crosstalk (RTI)—ADA4851-2/ADA4851-4 DC PERFORMANCE Input Offset Voltage Input Offset Voltage Drift Input Bias Current Input Bias Current Drift Input Bias Offset Current Open-Loop Gain INPUT CHARACTERISTICS Input Resistance Input Capacitance Input Common-Mode Voltage Range Input Overdrive Recovery Time (Rise/Fall) Common-Mode Rejection Ratio POWER-DOWN Power-Down Input Voltage Turn-Off Time Turn-On Time Power-Down Bias Current Enabled Power-Down OUTPUT CHARACTERISTICS Output Overdrive Recovery Time (Rise/Fall) Output Voltage Swing Short-Circuit Current POWER SUPPLY Operating Range Quiescent Current per Amplifier Quiescent Current (Power-Down) Positive Power Supply Rejection Negative Power Supply Rejection Conditions Min Typ G = +1, VO = 0.1 V p-p G = +1, VO = 0.5 V p-p G = +2, VO = 1.0 V p-p, RL = 150 Ω G = +2, VO = 1 V p-p, RL = 150 Ω G = +2, VO = 1 V step G = +2, VO = 1 V step, RL = 150 Ω 104 80 130 105 40 15 100 50 MHz MHz MHz MHz V/μs ns fC = 1 MHz, VO = 1 V p-p, G = −1 f = 100 kHz f = 100 kHz G = +3, NTSC, RL = 150 Ω, VO = 2 V p-p G = +3, NTSC, RL = 150 Ω, VO = 2 V p-p f = 5 MHz, G = +2, VO = 1.0 V p-p −73/−79 10 2.5 0.44 0.41 −70/−60 dBc nV/√Hz pA/√Hz % Degrees dB VO = 0.25 V to 0.75 V 80 0.6 4 2.3 6 20 105 −81 0.5/5.0 1.2 −0.2 to +0.8 60/60 −103 MΩ pF V ns dB Power-down Enabled <1.1 >1.6 0.7 60 V V μs ns Power-down = 3 V Power-down = 0 V 4 −14 Differential/common-mode VIN = +3.5 V, −0.5 V, G = +1 VCM = 0 V to 0.5 V VIN = +0.7 V, −0.1 V, G = +5 0.05 to 2.91 Sinking/sourcing Rev. D | Page 3 of 20 −81 −80 3.3 4.0 6 −20 70/100 0.03 to 2.94 90/70 2.7 Power-down = low +VS = +2.5 V to +3.5 V, −VS = −0.5 V +VS = +2.5 V, −VS = −0.5 V to –1.5 V Max 2.4 0.2 −100 −100 Unit mV μV/°C μA nA/°C nA dB μA μA ns V mA 12 2.7 0.3 V mA mA dB dB ADA4851-1/ADA4851-2/ADA4851-4 SPECIFICATIONS WITH +5 V SUPPLY TA = 25°C, RF = 0 Ω for G = +1, RF = 1 kΩ for G > +1, RL = 1 kΩ, unless otherwise noted. Table 2. Parameter DYNAMIC PERFORMANCE −3 dB Bandwidth Bandwidth for 0.1 dB Flatness Slew Rate Settling Time to 0.1% NOISE/DISTORTION PERFORMANCE Harmonic Distortion (dBc) HD2/HD3 Input Voltage Noise Input Current Noise Differential Gain Differential Phase Crosstalk (RTI)—ADA4851-2/ADA4851-4 DC PERFORMANCE Input Offset Voltage Input Offset Voltage Drift Input Bias Current Input Bias Current Drift Input Bias Offset Current Open-Loop Gain INPUT CHARACTERISTICS Input Resistance Input Capacitance Input Common-Mode Voltage Range Input Overdrive Recovery Time (Rise/Fall) Common-Mode Rejection Ratio POWER-DOWN Power-Down Input Voltage Turn-Off Time Turn-On Time Power-Down Bias Current Enabled Power-Down OUTPUT CHARACTERISTICS Output Overdrive Recovery Time (Rise/Fall) Output Voltage Swing Short-Circuit Current POWER SUPPLY Operating Range Quiescent Current per Amplifier Quiescent Current (Power-Down) Positive Power Supply Rejection Negative Power Supply Rejection Conditions Min Typ G = +1, VO = 0.1 V p-p G = +1, VO = 0.5 V p-p G = +2, VO = 1.4 V p-p, RL = 150 Ω G = +2, VO = 1.4 V p-p, RL = 150 Ω G = +2, VO = 2 V step G = +2, VO = 2 V step, RL = 150 Ω 96 72 125 96 35 11 200 55 MHz MHz MHz MHz V/μs ns fC = 1 MHz, VO = 2 V p-p, G = +1 f = 100 kHz f = 100 kHz G = +2, NTSC, RL = 150 Ω, VO = 2 V p-p G = +2, NTSC, RL = 150 Ω, VO = 2 V p-p f = 5 MHz, G = +2, VO = 2.0 V p-p −80/−100 10 2.5 0.08 0.11 −70/−60 dBc nV/√Hz pA/√Hz % Degrees dB VO = 1 V to 4 V 97 0.6 4 2.2 6 20 107 −86 0.5/5.0 1.2 −0.2 to +2.8 50/45 −105 MΩ pF V ns dB Power-down Enabled <1.1 >1.6 0.7 50 V V μs ns Power-down = 5 V Power-down = 0 V 33 −22 Differential/common-mode VIN = +5.5 V, −0.5 V, G = +1 VCM = 0 V to 2 V VIN = +1.1 V, −0.1 V, G = +5 0.09 to 4.91 Sinking/sourcing Rev. D | Page 4 of 20 −82 −81 3.4 3.9 40 −30 60/70 0.06 to 4.94 110/90 2.7 Power-down = low +VS = +5 V to +6 V, −VS = 0 V +VS = +5 V, −VS = −0 V to −1 V Max 2.5 0.2 −101 −101 Unit mV μV/°C μA nA/°C nA dB μA μA ns V mA 12 2.8 0.3 V mA mA dB dB ADA4851-1/ADA4851-2/ADA4851-4 SPECIFICATIONS WITH ±5 V SUPPLY TA = 25°C, RF = 0 Ω for G = +1, RF = 1 kΩ for G > +1, RL = 1 kΩ, unless otherwise noted. Table 3. Parameter DYNAMIC PERFORMANCE −3 dB Bandwidth Bandwidth for 0.1 dB Flatness Slew Rate Settling Time to 0.1% NOISE/DISTORTION PERFORMANCE Harmonic Distortion (dBc) HD2/HD3 Input Voltage Noise Input Current Noise Differential Gain Differential Phase Crosstalk(RTI)—ADA4851-2/ADA4851-4 DC PERFORMANCE Input Offset Voltage Input Offset Voltage Drift Input Bias Current Input Bias Current Drift Input Bias Offset Current Open-Loop Gain INPUT CHARACTERISTICS Input Resistance Input Capacitance Input Common-Mode Voltage Range Input Overdrive Recovery Time (Rise/Fall) Common-Mode Rejection Ratio POWER-DOWN Power-Down Input Voltage Turn-Off Time Turn-On Time Power-Down Bias Current Enabled Power-Down OUTPUT CHARACTERISTICS Output Overdrive Recovery Time (Rise/Fall) Output Voltage Swing Short-Circuit Current POWER SUPPLY Operating Range Quiescent Current per Amplifier Quiescent Current (Power-Down) Positive Power Supply Rejection Negative Power Supply Rejection Conditions Min Typ G = +1, VO = 0.1 V p-p G = +1, VO = 1 V p-p G = +2, VO = 2 V p-p, RL = 150 Ω G = +2, VO = 2 V p-p, RL = 150 Ω G = +2, VO = 7 V step G = +2, VO = 2 V step G = +2, VO = 2 V step, RL = 150 Ω 83 52 105 74 40 11 375 190 55 MHz MHz MHz MHz V/μs V/μs ns fC = 1 MHz, VO = 2 V p-p, G = +1 f = 100 kHz f = 100 kHz G = +2, NTSC, RL = 150 Ω, VO = 2 V p-p G = +2, NTSC, RL = 150 Ω, VO = 2 V p-p f = 5 MHz, G = +2, VO = 2.0 V p-p −83/−107 10 2.5 0.08 0.09 −70/−60 dBc nV/√Hz pA/√Hz % Degrees dB VO = ±2.5 V 99 0.6 4 2.2 6 20 106 −90 0.5/5.0 1.2 −5.2 to +2.8 50/25 −105 MΩ pF V ns dB Power-down Enabled < −3.9 > −3.4 0.7 30 V V μs ns Power-down = +5 V Power-down = −5 V 100 −50 Differential/common-mode VIN = ±6 V, G = +1 VCM = 0 V to 4 V VIN = ±1.2 V, G = +5 −4.87 to +4.88 Sinking/sourcing Rev. D | Page 5 of 20 −82 −81 3.5 4.0 130 −60 80/50 −4.92 to +4.92 125/110 2.7 Power-down = low +VS = +5 V to +6 V, −VS = −5 V +VS = +5 V, −VS = −5 V to −6 V Max 2.9 0.2 −101 −102 Unit mV μV/°C μA nA/°C nA dB μA μA ns V mA 12 3.2 0.3 V mA mA dB dB ADA4851-1/ADA4851-2/ADA4851-4 ABSOLUTE MAXIMUM RATINGS Table 4. due to the amplifiers’ drive at the output. The quiescent power is the voltage between the supply pins (VS) times the quiescent current (IS). Rating 12.6 V See Figure 5 −VS − 0.5 V to +VS + 0.5 V +VS to −VS −65°C to +125°C −40°C to +125°C JEDEC J-STD-20 150°C PD = Quiescent Power + (Total Drive Power − Load Power) ⎛V V ⎞ V 2 PD = (VS × I S ) + ⎜ S × OUT ⎟ – OUT RL ⎠ RL ⎝ 2 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 θJA is specified for the worst-case conditions, that is, θJA is specified for device soldered in circuit board for surface-mount packages. Table 5. Thermal Resistance θJA 170 120 150 Unit °C/W °C/W °C/W PD = (VS × I S ) + (VS /4 )2 RL In single-supply operation with RL referenced to −VS, worst case is VOUT = VS/2. Airflow increases heat dissipation, effectively reducing θJA. Also, more metal directly in contact with the package leads and through holes under the device reduces θJA. Figure 5 shows the maximum safe power dissipation in the package vs. the ambient temperature for the 6-lead SOT-23 (170°C/W), the 8-lead MSOP (150°C/W), and the 14-lead TSSOP (120°C/W) on a JEDEC standard 4-layer board. θJA values are approximations. 2.0 Maximum Power Dissipation The maximum safe power dissipation for the ADA4851-1/ ADA4851-2/ADA4851-4 is limited by the associated rise in junction temperature (TJ) on the die. At approximately 150°C, which is the glass transition temperature, the plastic changes its properties. Even temporarily exceeding this temperature limit may change the stresses that the package exerts on the die, permanently shifting the parametric performance of the amplifiers. Exceeding a junction temperature of 150°C for an extended period can result in changes in silicon devices, potentially causing degradation or loss of functionality. The power dissipated in the package (PD) is the sum of the quiescent power dissipation and the power dissipated in the die TSSOP 1.5 MSOP 1.0 SOT-23-6 0.5 0 –55 –45 –35 –25 –15 –5 5 15 25 35 45 55 65 75 85 95 105 115 125 AMBIENT TEMPERATURE (°C) 05143-057 Package Type 6-lead SOT-23 14-lead TSSOP 8-lead MSOP RMS output voltages should be considered. If RL is referenced to −VS, as in single-supply operation, the total drive power is VS × IOUT. If the rms signal levels are indeterminate, consider the worst case, when VOUT = VS/4 for RL to midsupply. MAXIMUM POWER DISSIPATION (W) Parameter Supply Voltage Power Dissipation Common-Mode Input Voltage Differential Input Voltage Storage Temperature Operating Temperature Range Lead Temperature Range Junction Temperature Figure 5. Maximum Power Dissipation vs. Temperature for a 4-Layer Board 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. D | Page 6 of 20 ADA4851-1/ADA4851-2/ADA4851-4 TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, RF = 0 Ω for G = +1, RF = 1 kΩ for G > +1, RL = 1 kΩ, unless otherwise noted. 1 0 2 G = –1 –1 –2 –3 G = +10 –4 G = +2 –5 10pF G = +1 VS = 5V RL = 1kΩ VOUT = 0.1V p-p 3 CLOSED-LOOP GAIN (dB) CLOSED-LOOP GAIN (dB) 4 VS = ±5V RL = 150Ω VOUT = 0.1V p-p 1 0 5pF –1 0pF –2 –3 –4 –6 10 100 FREQUENCY (MHz) –6 05143-006 1 Figure 6. Small Signal Frequency Response for Various Gains +125°C 0 VS = ±5V G = +1 VOUT = 0.1V p-p –1 CLOSED-LOOP GAIN (dB) RL = 1kΩ –2 –3 –4 +85°C VS = ±5V G = +1 VOUT = 0.1V p-p –1 –40°C +25°C –2 –3 –4 10 100 300 FREQUENCY (MHz) –6 05143-009 1 100 VS = +5V VS = ±5V RL = 150Ω VOUT = 1V p-p 0 CLOSED-LOOP GAIN (dB) 0 –1 300 Figure 10. Small Signal Frequency Response for Various Temperatures 1 G = +1 RL = 150Ω VOUT = 0.1V p-p 1 10 FREQUENCY (MHz) Figure 7. Small Signal Frequency Response for Various Loads 2 1 05143-008 –5 –5 VS = ±5V –2 –3 –4 –5 –1 –2 –3 –4 G = +2 G = +10 –5 G = –1 1 10 100 300 FREQUENCY (MHz) 05143-007 –6 Figure 8. Small Signal Frequency Response for Various Supplies –7 1 10 100 FREQUENCY (MHz) Figure 11. Large Signal Frequency Response for Various Gains Rev. D | Page 7 of 20 05143-012 CLOSED-LOOP GAIN (dB) 300 1 0 CLOSED-LOOP GAIN (dB) 100 Figure 9. Small Signal Frequency Response for Various Capacitor Loads RL = 150Ω –6 10 FREQUENCY (MHz) 1 –6 1 05143-010 –5 –7 ADA4851-1/ADA4851-2/ADA4851-4 6.2 6.1 G = –1 VS = 3V RL = 150Ω VOUT = 2V –50 6.0 HD2 –60 5.9 DISTORTION (dBc) VOUT = 100mV p-p 5.8 VOUT = 1V p-p VOUT = 2V p-p 5.7 –70 –80 HD3 –90 5.6 1 10 100 FREQUENCY (MHz) –110 0.1 05143-021 5.4 0.1 Figure 15. Harmonic Distortion vs. Frequency Figure 12. 0.1 dB Flatness Response –50 1 VS = ±5V G = +1 VOUT = 1V p-p –1 RL = 1kΩ –2 G = +2 VS = ±5V RL = 1kΩ f = 2MHz –60 HARMONIC DISTORTION (dBc) RL = 150Ω –3 –4 –80 HD3 –90 –100 –110 –5 10 100 300 05143-015 –120 1 FREQUENCY (MHz) 0 0 –40 –30 –50 –90 60 –120 40 –150 GAIN 20 –180 0 –210 –20 10 100 1k 10k 100k 1M 10M 100M FREQUENCY (Hz) –240 1G HARMONIC DISTORTION (dBc) 80 3 4 5 6 7 8 9 10 G = +1 VOUT = 2V p-p VS = ±5V –60 RL = 1kΩ HD2 –70 –80 RL = 150Ω HD2 RL = 150Ω HD3 –90 RL = 1kΩ HD3 –100 05143-029 –60 PHASE OPEN-LOOP PHASE (Degrees) VS = ±5V 100 2 Figure 16. Harmonic Distortion vs. Output Voltage 140 120 1 OUTPUT AMPLITUDE (V p-p) Figure 13. Large Frequency Response for Various Loads OPEN-LOOP GAIN (dB) HD2 –70 05143-017 CLOSED-LOOP GAIN (dB) 0 –6 10 1 FREQUENCY (MHz) 05143-014 –100 5.5 –110 0.1 Figure 14. Open-Loop Gain and Phase vs. Frequency 1 10 FREQUENCY (MHz) Figure 17. Harmonic Distortion vs. Frequency for Various Loads Rev. D | Page 8 of 20 05143-016 CLOSED-LOOP GAIN (dB) –40 VS = ±5V G = +2 RL = 150Ω RF = 1kΩ ADA4851-1/ADA4851-2/ADA4851-4 OUTPUT VOLTAGE FOR ±5V SUPPLY (V) –60 RL = 1kΩ HD2 –70 –80 RL = 150Ω HD2 RL = 150Ω HD3 –90 –100 RL = 1kΩ HD3 2.550 0.025 2.525 0 2.500 –0.025 1 10 FREQUENCY (MHz) 4 5 × INPUT 50 100 2.425 200 150 Figure 21. Small Signal Transient Response for Various Supplies 2.575 2 1 0 –1 –2 –3 –4 10pF G = +1 VS = 5V RL = 150Ω 2.550 OUTPUT VOLTAGE (V) 3 0 TIME (ns) G = +5 VS = ±5V RL = 150Ω f = 1MHz OUTPUT 5 2.475 2.450 –0.050 Figure 18. Harmonic Distortion vs. Frequency for Various Loads 6 VS = ±5V VS = +5V –0.075 –110 0.1 INPUT AND OUTPUT VOLTAGE (V) 0.050 05143-013 HARMONIC DISTORTION (dBc) –50 2.575 G = +1 OR +2 RL = 1kΩ OUTPUT VOLTAGE FOR 5V SUPPLY (V) 0.075 G = +1 VOUT = 2V p-p VS = 5V 05143-024 –40 0pF 2.525 2.500 2.475 2.450 200 300 400 500 600 700 800 900 1k TIME (ns) 2.425 G = +1 VS = ±5V RL = 150Ω f = 1MHz 4 3 OUTPUT 2 1 0 –1 –2 –3 –4 –5 –6 0 100 200 300 400 500 600 700 800 TIME (ns) 60 80 100 120 140 160 1.5 OUTPUT VOLTAGE FOR ±5V SUPPLY (V) INPUT 40 180 200 Figure 22. Small Signal Transient Response for Capacitive Load 900 1k 05143-022 INPUT AND OUTPUT VOLTAGE (V) 5 20 TIME (ns) Figure 19. Output Overdrive Recovery 6 0 3.0 G = +2 RL = 150Ω 1.0 2.5 VS = ±5V VS = +5V 0.5 2.0 0 1.5 –0.5 1.0 –1.0 0.5 –1.5 0 50 100 150 0 200 TIME (ns) Figure 20. Input Overdrive Recovery Figure 23. Large Signal Transient Response for Various Supplies Rev. D | Page 9 of 20 OUTPUT VOLTAGE FOR 5V SUPPLY (V) 100 05143-028 0 05143-019 –6 05143-026 –5 ADA4851-1/ADA4851-2/ADA4851-4 VS = +5V 2.0 0 1.5 –0.5 1.0 –1.0 0.5 0 50 100 0 200 150 TIME (ns) VDISABLE 4 3 2 1 0 VOUT –1 0 15 Figure 24. Large Signal Transient Response for Various Supplies 3.5 +VS – VOUT 0.4 3.0 VS = ±5V SUPPLY CURRENT (mA) VS = ±5V VS = +3V 0.3 –VS – VOUT 0.2 0.1 2.5 VS = +5V 2.0 VS = +3V 1.5 1.0 0 0 5 10 15 20 25 30 35 LOAD CURRENT (mA) 0 –5 –1 0 1 2 3 4 5 300 INPUT OFFSET VOLTAGE (μV) 200 NEGATIVE SLEW RATE 400 –2 Figure 28. ADA4851-1, Supply Current vs. POWER DOWN Pin Voltage G = +2 VS = ±5V RL = 1kΩ 25% TO 75% OF VO 500 –3 DISABLE VOLTAGE (V) Figure 25. Output Saturation Voltage vs. Load Current 600 –4 05143-034 0.5 05143-049 300 POSITIVE SLEW RATE 200 100 VS = +3V 100 VS = ±5V 0 VS = +5V –100 –200 0 0 1 2 3 4 5 6 7 8 OUTPUT VOLTAGE STEP (V p-p) Figure 26. Slew Rate vs. Output Voltage 9 10 05143-032 –300 –400 –40 –25 –10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) Figure 29. Input Offset Voltage vs. Temperature for Various Supplies Rev. D | Page 10 of 20 05143-035 DC VOLTAGE DIFFERENTIAL FROM VS (V) 45 Figure 27. Enable/Disable Time 0.5 SLEW RATE (V/μs) 30 TIME (μs) 05143-033 VS = ±5V 0.5 G = +2 VS = 5V fIN = 400kHz 5 VOLTAGE (V) 2.5 OUTPUT VOLTAGE FOR 5V SUPPLY (V) 1.0 –1.5 6 3.0 G = +1 RL = 150Ω 05143-027 OUTPUT VOLTAGE FOR ±5V SUPPLY (V) 1.5 ADA4851-1/ADA4851-2/ADA4851-4 2.2 1000 G = +1 IB+, VS = ±5V 1.8 IB–, VS = ±5V IB+, VS = +5V 1.6 IB–, VS = +5V 1.2 –40 –25 –10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) 10 1 10 05143-036 1.4 100 100 100k 1M 10M 100M Figure 33. Voltage Noise vs. Frequency 100 0.09 G = +2 VS = ±5V CURRENT NOISE (pA/ Hz) 0.08 +VS – VOUT VS = +5V 0.07 +VS – VOUT –VS – VOUT 0.06 10 0.05 0.04 –40 1 –25 –10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) 10 100 1k 10k 100k 1M 10M 100M FREQUENCY (Hz) 05143-045 –VS – VOUT 05143-037 Figure 34. Current Noise vs. Frequency Figure 31. Output Saturation vs. Temperature for Various Supplies 80 3.2 VS = ±5V N = 420 x = –260μV σ = 780μV 70 VS = ±5V 3.0 60 50 COUNT 2.8 VS = +5V 2.6 40 30 2.4 20 VS = +3V 10 2.2 –25 –10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) 05143-038 0 2.0 –40 –4 –3 –2 –1 0 1 2 3 VOFFSET (mV) Figure 35. Input Offset Voltage Distribution Figure 32. Supply Current vs. Temperature for Various Supplies Rev. D | Page 11 of 20 4 05143-047 DC VOLTAGE DIFFERENTIAL FROM VS (V) 10k FREQUENCY (Hz) Figure 30. Input Bias Current vs. Temperature for Various Supplies SUPPLY CURRENT (mA) 1k 05143-044 VOLTAGE NOISE (nV/ Hz) INPUT BIAS CURRENT (μA) 2.0 ADA4851-1/ADA4851-2/ADA4851-4 0 –30 VS = ±5V –20 –50 DRIVE AMPS 1, 2, AND 4 LISTEN AMP 3 –30 –60 –70 –80 –90 –100 –40 –50 –60 DRIVE AMP 1 LISTEN AMP 2 –70 –80 –110 1k 10k 100k 1M 10M 100M 1G FREQUENCY (Hz) 1 100 Figure 38. ADA4851-4, RTI Crosstalk vs. Frequency Figure 36. Common-Mode Rejection Ratio (CMRR) vs. Frequency 0 0 VS = ±5V –10 –20 –20 –30 +PSR –50 –60 –30 CROSSTALK (dB) –40 –PSR –70 –40 –50 –60 –70 –90 –80 –100 –90 1k 10k 100k 1M 10M 100M FREQUENCY (Hz) 1G 05143-023 –80 –110 100 G = +2 VS = 5V RL = 1kΩ VIN = 1V p-p –100 0.1 DRIVE AMP 1 LISTEN AMP 2 DRIVE AMP 2 LISTEN AMP 1 1 10 100 FREQUENCY (MHz) Figure 39. ADA4851-2, RTI Crosstalk vs. Frequency Figure 37. Power Supply Rejection (PSR) vs. Frequency Rev. D | Page 12 of 20 05143-060 –10 POWER SUPPLY REJECTION (dB) 10 FREQUENCY (MHz) 05143-055 –90 –100 0.1 05143-020 –120 G = +2 VS = 5V RL = 1kΩ VIN = 1V p-p –10 CROSSTALK (dB) COMMON-MODE REJECTION (dB) –40 ADA4851-1/ADA4851-2/ADA4851-4 CIRCUIT DESCRIPTION 440 460 480 500 VOS (μV) The ADA4851-1, ADA4851-2, and ADA4851-4 feature a high slew rate input stage that is a true single-supply topology, capable of sensing signals at or below the minus supply rail. The rail-to-rail output stage can pull within 60 mV of either supply rail when driving light loads and within 0.17 V when driving 150 Ω. High speed performance is maintained at supply voltages as low as 2.7 V. 520 540 HEADROOM CONSIDERATIONS 560 These amplifiers are designed for use in low voltage systems. To obtain optimum performance, it is useful to understand the behavior of the amplifiers as input and output signals approach the amplifiers’ headroom limits. The amplifiers’ input commonmode voltage range extends from the negative supply voltage (actually 200 mV below this), or from ground for single-supply operation, to within 2.2 V of the positive supply voltage. Therefore, at a gain of 3, the amplifiers can provide full rail-to-rail output swing for supply voltages as low as 3.3 V and down to 3 V for a gain of 4. –6 –5 –4 –3 –2 –1 0 1 2 The input stage is the headroom limit for signals approaching the positive rail. Figure 40 shows a typical offset voltage vs. the input common-mode voltage for the ADA4851-1/ADA4851-2/ ADA4851-4 amplifiers on a ±5 V supply. Accurate dc performance is maintained from approximately 200 mV below the minus supply to within 2.2 V of the positive supply. For high speed signals, however, there are other considerations. Figure 41 shows −3 dB bandwidth vs. dc input voltage for a unity-gain follower. As the common-mode voltage gets within 2 V of positive supply, the amplifier responds well but the bandwidth begins to drop as the common-mode voltage approaches the positive supply. This can manifest itself in increased distortion or settling time. Higher frequency signals require more headroom than the lower frequencies to maintain distortion performance. 1000 3 VCM (V) Figure 40. VOS vs. Common-Mode Voltage, VS = ±5 V 2 1 G = +1 RL = 1kΩ VS = 5V VCM = 3.0V 0 VCM = 3.1V –1 GAIN (dB) Exceeding the headroom limit is not a concern for any inverting gain on any supply voltage, as long as the reference voltage at the amplifier’s positive input lies within the amplifier’s input common-mode range. 4 05143-046 600 05143-050 580 –2 VCM = 3.2V –3 VCM = 3.3V –4 –5 –6 0.1 1 10 100 FREQUENCY (MHz) Figure 41. Unity-Gain Follower Bandwidth vs. Input Common-Mode Rev. D | Page 13 of 20 ADA4851-1/ADA4851-2/ADA4851-4 Figure 42 illustrates how the rising edge settling time for the amplifier is configured as a unity-gain follower, stretching out as the top of a 1 V step input that approaches and exceeds the specified input common-mode voltage limit. The amplifiers do not exhibit phase reversal, even for input voltages beyond the voltage supply rails. Going more than 0.6 V beyond the power supplies turns on protection diodes at the input stage, which greatly increases the current draw of the devices. 3.6 3.50 G = +1 RL = 1kΩ VS = 5V 3.4 G = +1 RL = 1kΩ VS = 5V 3.25 OUTPUT VOLTAGE (V) For signals approaching the minus supply and inverting gain and high positive gain configurations, the headroom limit is the output stage. The ADA4851-1/ADA4851-2/ADA4851-4 amplifiers use a common emitter output stage. This output stage maximizes the available output range, limited by the saturation voltage of the output transistors. The saturation voltage increases with the drive current that the output transistor is required to supply due to the output transistor’s collector resistance. VSTEP = 2.25V TO 3.25V 3.00 VSTEP = 2.25V TO 3.5V, 4V, AND 5V 2.75 2.50 2.25 0 300 400 500 600 700 800 900 1k Figure 43. Pulse Response of G = 1 Follower, Input Step Overloading the Input Stage VSTEP = 2.1V TO 3.1V 2.6 200 TIME (ns) VSTEP = 2V TO 3V 2.8 100 05143-051 2.00 3.0 VSTEP = 2.2V TO 3.2V 2.4 Output VSTEP = 2.3V TO 3.3V 2.2 VSTEP = 2.4V TO 3.4V 2.0 0 10 20 30 40 50 60 70 80 90 05143-052 1.8 100 TIME (ns) Output overload recovery is typically within 35 ns after the amplifier’s input is brought to a nonoverloading value. Figure 44 shows output recovery transients for the amplifier configured in an inverting gain of 1 recovering from a saturated output from the top and bottom supplies to a point at midsupply. Figure 42. Output Rising Edge for 1 V Step at Input Headroom Limits OVERLOAD BEHAVIOR AND RECOVERY Input 6 INPUT AND OUTPUT VOLTAGE (V) As the saturation point of the output stage is approached, the output signal shows increasing amounts of compression and clipping. As in the input headroom case, higher frequency signals require a bit more headroom than the lower frequency signals. Figure 16 illustrates this point by plotting the typical distortion vs. the output amplitude. 7 The specified input common-mode voltage of the ADA4851-1/ ADA4851-2/ADA4851-4 is 200 mV below the negative supply to within 2.2 V of the positive supply. Exceeding the top limit results in lower bandwidth and increased rise time, as seen in Figure 41 and Figure 42. Pushing the input voltage of a unitygain follower to less than 2 V from the positive supply leads to the behavior shown in Figure 43—an increasing amount of output error as well as a much increased settling time. The recovery time from input voltages 2.2 V or closer to the positive supply is approximately 55 ns, which is limited by the settling artifacts caused by transistors in the input stage coming out of saturation. Rev. D | Page 14 of 20 G = –1 RL = 1kΩ VS = 5V VOUT = 5V TO 2.5V 5 VOUT = 0V TO 2.5V 4 3 INPUT VOLTAGE EDGES 2 1 0 –1 –2 0 10 20 30 40 50 60 70 TIME (ns) Figure 44. Overload Recovery 80 90 100 05143-053 OUTPUT VOLTAGE (V) 3.2 ADA4851-1/ADA4851-2/ADA4851-4 SINGLE-SUPPLY VIDEO AMPLIFIER The ADA4851 family of amplifiers is well-suited for portable video applications. When operating in low voltage single-supply applications, the input signal is limited by the input stage headroom. For additional information, see the Headroom Considerations section. Table 6 illustrates the effects of supply voltage, input signal, various gains, and output signal swing for the typical video amplifier shown in Figure 45. RF +VS An example of an 8 MHz, 3-pole, Sallen-Key low pass, video reconstruction filter is shown in Figure 46. This circuit features a gain of 3, has a 0.1 dB bandwidth of 8.2 MHz, and over 17 dB attenuation at 27 MHz (see Figure 47).The filter has 3 poles; two are active with a third passive pole (R6 and C4) placed at the output. C3 improves the filter rolloff. R6, R7, and R8 comprise the video load of 150 Ω. Components R6, C4, R7, R8, and the input termination of the network analyzer form a 12.8 dB attenuator; therefore, the reference level is roughly −3.3 dB, as shown in Figure 47. C1 2.2μF C2 51pF + U1 75Ω CABLE 75Ω V′ VIN VIDEO DAC VOUT 75Ω R1 37.4Ω C1 51pF R5 1kΩ Table 6. Recommended Values Input Range (V) 0 to 0.8 0 to 0.8 0 to 2.8 R6 6.8Ω R7 68.1Ω R8 75Ω C4 1nF R4 2kΩ Figure 45. Video Amplifier Supply Voltage (V) 3 3 5 +3V C3 6.8pF Figure 46. 8 MHz Video Reconstruction Filter Schematic RG (kΩ) 1 0.499 1 RF (kΩ) 1 1 1 Gain (V/V) 2 3 2 V’ (V) 1.6 2.4 4.9 VOUT (V) 0.8 1.2 2.45 5dB/REF –15dB 1: –3.3931dB 8.239 626MHz 1 VIDEO RECONSTRUCTION FILTER Rev. D | Page 15 of 20 0.03 0.1 1 FREQUENCY (MHz) 10 05143-062 At higher frequencies, active filters require wider bandwidths to work properly. Excessive phase shift introduced by lower frequency op amps can significantly affect the filter performance. A common application for active filters is at the output of video DACs/encoders. The filter, or more appropriately, the video reconstruction filter is used at the output of a video DAC/encoder to eliminate the multiple images that are created during the sampling process within the DAC. For portable video applications, the ADA4851-x is an ideal choice due to its lower power requirements and high performance. VOUT 05143-061 C2 0.01μF 05143-059 RG R2 R3 47Ω 125Ω IOUT PD 100 Figure 47. Video Reconstruction Filter Frequency Performance ADA4851-1/ADA4851-2/ADA4851-4 OUTLINE DIMENSIONS 2.90 BSC 6 5 4 2.80 BSC 1.60 BSC 1 2 3 PIN 1 INDICATOR 0.95 BSC 1.90 BSC 1.30 1.15 0.90 1.45 MAX 0.50 0.30 0.15 MAX 0.22 0.08 10° 4° 0° SEATING PLANE 0.60 0.45 0.30 COMPLIANT TO JEDEC STANDARDS MO-178-AB Figure 48. 6-Lead Small Outline Transistor Package [SOT-23] (RJ-6) Dimensions shown in millimeters 3.20 3.00 2.80 8 3.20 3.00 2.80 1 5 5.15 4.90 4.65 4 PIN 1 0.65 BSC 0.95 0.85 0.75 1.10 MAX 0.15 0.00 0.38 0.22 COPLANARITY 0.10 0.23 0.08 8° 0° SEATING PLANE COMPLIANT TO JEDEC STANDARDS MO-187-AA Figure 49. 8-Lead Mini Small Outline Package [MSOP] (RM-8) Dimensions shown in millimeters Rev. D | Page 16 of 20 0.80 0.60 0.40 ADA4851-1/ADA4851-2/ADA4851-4 5.10 5.00 4.90 14 8 4.50 4.40 4.30 6.40 BSC 1 7 PIN 1 1.05 1.00 0.80 0.65 BSC 1.20 MAX 0.15 0.05 0.30 0.19 0.20 0.09 SEATING COPLANARITY PLANE 0.10 8° 0° 0.75 0.60 0.45 COMPLIANT TO JEDEC STANDARDS MO-153-AB-1 Figure 50. 14-Lead Thin Shrink Small Outline Package [TSSOP] (RU-14) Dimensions shown in millimeters ORDERING GUIDE Model ADA4851-1YRJZ-R2 1 ADA4851-1YRJZ-RL1 ADA4851-1YRJZ-RL71 ADA4851-2YRMZ1 ADA4851-2YRMZ-RL1 ADA4851-2YRMZ-RL71 ADA4851-4YRUZ1 ADA4851-4YRUZ-RL1 ADA4851-4YRUZ-R71 1 Temperature Range −40°C to +125°C −40°C to +125°C −40°C to +125°C −40°C to +125°C −40°C to +125°C −40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C Package Description 6-Lead Small Outline Transistor Package (SOT-23) 6-Lead Small Outline Transistor Package (SOT-23) 6-Lead Small Outline Transistor Package (SOT-23) 8-Lead Mini Small Outline Package (MSOP) 8-Lead Mini Small Outline Package (MSOP) 8-Lead Mini Small Outline Package (MSOP) 14-Lead Thin Shrink Small Outline Package (TSSOP) 14-Lead Thin Shrink Small Outline Package (TSSOP) 14-Lead Thin Shrink Small Outline Package (TSSOP) Z = Pb-free part. Rev. D | Page 17 of 20 Package Option RJ-6 RJ-6 RJ-6 RM-8 RM-8 RM-8 RU-14 RU-14 RU-14 Branding HHB HHB HHB HSB HSB HSB ADA4851-1/ADA4851-2/ADA4851-4 NOTES Rev. D | Page 18 of 20 ADA4851-1/ADA4851-2/ADA4851-4 NOTES Rev. D | Page 19 of 20 ADA4851-1/ADA4851-2/ADA4851-4 NOTES © 2006 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D05143-0-4/06(D) Rev. D | Page 20 of 20