ADA4851-2YRMZ-RL

Low Cost, High Speed, Rail-to-Rail, Output Op Amps ADA4851-1/ADA4851-2/ADA4851-4 FEATURES 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 PIN CONFIGURATIONS VOUT 1 –VS 2 +IN 3 ADA4851-1 6 5 4 +VS POWER DOWN 05143-001 –IN TOP VIEW (Not to Scale) Figure 1. ADA4851-1, 6-Lead SOT-23 (RJ-6) ADA4851-2 OUT1 1 –IN1 2 +IN1 3 –VS 4 TOP VIEW (Not to Scale) 8 7 6 5 +VS OUT –IN2 +IN2 05143-058 Figure 2. ADA4851-2, 8-Lead MSOP (RM-8) VOUT 1 1 –IN 1 2 14 VOUT 4 13 12 11 10 9 8 –IN 4 +IN 4 –VS +IN 3 –IN 3 VOUT 3 05143-054 +IN 1 3 APPLICATIONS Consumer video Professional video Video switchers Active filters +VS 4 +IN 2 5 –IN 2 6 VOUT 2 7 TOP VIEW (Not to Scale) ADA4851-4 Figure 3. ADA4851-4, 14-Lead TSSOP (RU-14) GENERAL DESCRIPTION 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. 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. 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. The ADA4851 family is designed to work over the extended temperature range (−40°C to +125°C). 4 3 2 G = +1 VS = 5V RL = 1kΩ CL = 5pF CLOSED-LOOP GAIN (dB) 1 0 –1 –2 –3 –4 –5 1 10 100 1k 05143-004 –6 FREQUENCY (MHz) 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 Applications....................................................................................... 1 Pin Configurations ........................................................................... 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Specifications with +3 V Supply................................................. 3 Specifications with +5 V Supply................................................. 4 Specifications with ±5 V Supply................................................. 5 Absolute Maximum Ratings............................................................ 6 Thermal Resistance .......................................................................6 ESD Caution...................................................................................6 Typical Performance Characteristics ..............................................7 Circuit Description......................................................................... 13 Headroom Considerations........................................................ 13 Overload Behavior and Recovery ............................................ 14 Single-Supply Video Amplifier................................................. 15 Video Reconstruction Filter...................................................... 15 Outline Dimensions ....................................................................... 16 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 Conditions 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 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 Min 104 80 Typ 130 105 40 15 100 50 −73/−79 10 2.5 0.44 0.41 −70/−60 0.6 4 2.3 6 20 105 0.5/5.0 1.2 −0.2 to +0.8 60/60 −103 1.6 0.7 60 4 −14 70/100 0.03 to 2.94 90/70 12 2.7 0.3 6 −20 3.3 4.0 Max Unit MHz MHz MHz MHz V/μs ns dBc nV/√Hz pA/√Hz % Degrees dB mV μV/°C μA nA/°C nA dB MΩ pF V ns dB V V μs ns μA μA ns V mA V mA mA dB dB 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 VO = 0.25 V to 0.75 V Differential/common-mode 80 VIN = +3.5 V, −0.5 V, G = +1 VCM = 0 V to 0.5 V Power-down Enabled −81 Power-down = 3 V Power-down = 0 V VIN = +0.7 V, −0.1 V, G = +5 0.05 to 2.91 Sinking/sourcing 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 −81 −80 2.4 0.2 −100 −100 Rev. D | Page 3 of 20 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 Conditions 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 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 Min 96 72 Typ 125 96 35 11 200 55 −80/−100 10 2.5 0.08 0.11 −70/−60 0.6 4 2.2 6 20 107 0.5/5.0 1.2 −0.2 to +2.8 50/45 −105 1.6 0.7 50 33 −22 60/70 0.06 to 4.94 110/90 12 2.8 0.3 40 −30 3.4 3.9 Max Unit MHz MHz MHz MHz V/μs ns dBc nV/√Hz pA/√Hz % Degrees dB mV μV/°C μA nA/°C nA dB MΩ pF V ns dB V V μs ns μA μA ns V mA V mA mA dB dB 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 V O = 1 V to 4 V Differential/common-mode 97 VIN = +5.5 V, −0.5 V, G = +1 VCM = 0 V to 2 V Power-down Enabled −86 Power-down = 5 V Power-down = 0 V VIN = +1.1 V, −0.1 V, G = +5 0.09 to 4.91 Sinking/sourcing 2.7 Power-down = low +VS = +5 V to +6 V, −VS = 0 V +VS = +5 V, −VS = −0 V to −1 V −82 −81 2.5 0.2 −101 −101 Rev. D | Page 4 of 20 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 Conditions 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 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 Min 83 52 Typ 105 74 40 11 375 190 55 −83/−107 10 2.5 0.08 0.09 −70/−60 0.6 4 2.2 6 20 106 0.5/5.0 1.2 −5.2 to +2.8 50/25 −105 < −3.9 > −3.4 0.7 30 100 −50 80/50 −4.92 to +4.92 125/110 12 3.2 0.3 130 −60 3.5 4.0 Max Unit MHz MHz MHz MHz V/μs V/μs ns dBc nV/√Hz pA/√Hz % Degrees dB mV μV/°C μA nA/°C nA dB MΩ pF V ns dB V V μs ns μA μA ns V mA V mA mA dB dB 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 VO = ±2.5 V Differential/common-mode 99 VIN = ±6 V, G = +1 VCM = 0 V to 4 V Power-down Enabled −90 Power-down = +5 V Power-down = −5 V VIN = ±1.2 V, G = +5 −4.87 to +4.88 Sinking/sourcing 2.7 Power-down = low +VS = +5 V to +6 V, −VS = −5 V +VS = +5 V, −VS = −5 V to −6 V −82 −81 2.9 0.2 −101 −102 Rev. D | Page 5 of 20 ADA4851-1/ADA4851-2/ADA4851-4 ABSOLUTE MAXIMUM RATINGS Table 4. Parameter Supply Voltage Power Dissipation Common-Mode Input Voltage Differential Input Voltage Storage Temperature Operating Temperature Range Lead Temperature Range Junction Temperature 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 due to the amplifiers’ drive at the output. The quiescent power is the voltage between the supply pins (VS) times the quiescent current (IS). 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. 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. 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 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 Package Type 6-lead SOT-23 14-lead TSSOP 8-lead MSOP θJA 170 120 150 Unit °C/W °C/W °C/W MAXIMUM POWER DISSIPATION (W) 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 –55 –45 –35 –25 –15 –5 5 15 25 35 45 55 65 75 85 95 105 115 125 AMBIENT TEMPERATURE (°C) 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 05143-057 0 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 VS = ±5V RL = 150Ω VOUT = 0.1V p-p 4 3 2 G = +1 VS = 5V RL = 1kΩ VOUT = 0.1V p-p 10pF CLOSED-LOOP GAIN (dB) CLOSED-LOOP GAIN (dB) –1 –2 –3 G = +10 –4 –5 –6 –7 1 10 FREQUENCY (MHz) G = +2 G = –1 1 0 –1 –2 –3 –4 –5 5pF 0pF 05143-006 100 1 10 FREQUENCY (MHz) 100 300 Figure 6. Small Signal Frequency Response for Various Gains 1 RL = 150Ω 0 VS = ±5V G = +1 VOUT = 0.1V p-p Figure 9. Small Signal Frequency Response for Various Capacitor Loads 1 +125°C 0 +85°C VS = ±5V G = +1 VOUT = 0.1V p-p –40°C +25°C CLOSED-LOOP GAIN (dB) CLOSED-LOOP GAIN (dB) –1 –2 –3 –4 –5 –6 RL = 1kΩ –1 –2 –3 –4 –5 –6 05143-009 1 10 FREQUENCY (MHz) 100 300 1 10 FREQUENCY (MHz) 100 300 Figure 7. Small Signal Frequency Response for Various Loads 2 1 Figure 10. Small Signal Frequency Response for Various Temperatures 1 VS = ±5V RL = 150Ω VOUT = 1V p-p G = +1 RL = 150Ω VOUT = 0.1V p-p VS = +5V 0 CLOSED-LOOP GAIN (dB) –1 –2 –3 –4 –5 –6 CLOSED-LOOP GAIN (dB) 0 VS = ±5V –1 –2 –3 –4 –5 –6 –7 1 10 FREQUENCY (MHz) 100 G = +10 G = +2 G = –1 FREQUENCY (MHz) Figure 8. Small Signal Frequency Response for Various Supplies Figure 11. Large Signal Frequency Response for Various Gains Rev. D | Page 7 of 20 05143-012 1 10 100 300 05143-007 05143-008 05143-010 –6 ADA4851-1/ADA4851-2/ADA4851-4 6.2 6.1 VS = ±5V G = +2 RL = 150Ω RF = 1kΩ DISTORTION (dBc) –40 –50 –60 G = –1 VS = 3V RL = 150Ω VOUT = 2V HD2 CLOSED-LOOP GAIN (dB) 6.0 5.9 5.8 5.7 5.6 5.5 5.4 0.1 VOUT = 100mV p-p VOUT = 1V p-p VOUT = 2V p-p –70 –80 HD3 –90 –100 –110 0.1 05143-021 1 10 FREQUENCY (MHz) 100 1 FREQUENCY (MHz) 10 Figure 12. 0.1 dB Flatness Response 1 0 VS = ±5V G = +1 VOUT = 1V p-p Figure 15. Harmonic Distortion vs. Frequency –50 –60 G = +2 VS = ±5V RL = 1kΩ f = 2MHz HARMONIC DISTORTION (dBc) HD2 CLOSED-LOOP GAIN (dB) –1 –2 RL = 150Ω –3 –4 –5 –6 RL = 1kΩ –70 –80 –90 –100 –110 –120 HD3 1 10 FREQUENCY (MHz) 100 300 05143-015 0 1 2 3 4 5 6 7 8 9 10 OUTPUT AMPLITUDE (V p-p) Figure 13. Large Frequency Response for Various Loads 140 VS = ±5V 120 100 80 60 40 GAIN 20 0 –20 10 –180 –210 –240 1G PHASE –30 –60 –90 –120 –150 0 Figure 16. Harmonic Distortion vs. Output Voltage –40 –50 G = +1 VOUT = 2V p-p VS = ±5V HARMONIC DISTORTION (dBc) OPEN-LOOP PHASE (Degrees) OPEN-LOOP GAIN (dB) –60 RL = 1kΩ HD2 –70 –80 –90 –100 –110 0.1 RL = 150Ω HD2 RL = 150Ω HD3 RL = 1kΩ HD3 1 FREQUENCY (MHz) 10 FREQUENCY (Hz) Figure 14. Open-Loop Gain and Phase vs. Frequency Figure 17. Harmonic Distortion vs. Frequency for Various Loads Rev. D | Page 8 of 20 05143-016 100 1k 10k 100k 1M 10M 100M 05143-029 05143-017 05143-014 ADA4851-1/ADA4851-2/ADA4851-4 –40 OUTPUT VOLTAGE FOR ±5V SUPPLY (V) 0.075 –50 0.050 2.550 –60 RL = 1kΩ HD2 –70 –80 –90 –100 –110 0.1 0.025 2.525 0 2.500 RL = 150Ω HD2 RL = 150Ω HD3 –0.025 VS = +5V –0.050 VS = ±5V 2.475 2.450 RL = 1kΩ HD3 1 FREQUENCY (MHz) 10 05143-013 0 50 100 TIME (ns) 150 Figure 18. Harmonic Distortion vs. Frequency for Various Loads 6 5 OUTPUT 5 × INPUT Figure 21. Small Signal Transient Response for Various Supplies 2.575 G = +1 VS = 5V RL = 150Ω 10pF 0pF INPUT AND OUTPUT VOLTAGE (V) 4 3 2 1 0 –1 –2 –3 –4 –5 G = +5 VS = ±5V RL = 150Ω f = 1MHz 2.550 OUTPUT VOLTAGE (V) 2.525 2.500 2.475 2.450 0 20 40 60 80 100 120 140 160 180 200 TIME (ns) TIME (ns) Figure 19. Output Overdrive Recovery 6 5 INPUT G = +1 VS = ±5V RL = 150Ω f = 1MHz Figure 22. Small Signal Transient Response for Capacitive Load 1.5 OUTPUT VOLTAGE FOR ±5V SUPPLY (V) 3.0 OUTPUT VOLTAGE FOR 5V SUPPLY (V) 05143-028 INPUT AND OUTPUT VOLTAGE (V) 4 3 2 1 0 –1 –2 –3 –4 –5 0 100 200 300 400 500 600 700 OUTPUT G = +2 RL = 150Ω 1.0 VS = ±5V 0.5 VS = +5V 2.0 2.5 0 1.5 –0.5 1.0 –1.0 0.5 800 900 1k 05143-022 –6 –1.5 TIME (ns) 0 50 100 TIME (ns) 150 0 200 Figure 20. Input Overdrive Recovery Figure 23. Large Signal Transient Response for Various Supplies Rev. D | Page 9 of 20 05143-026 0 100 200 300 400 500 600 700 800 900 1k 05143-019 –6 2.425 05143-024 –0.075 2.425 200 OUTPUT VOLTAGE FOR 5V SUPPLY (V) G = +1 VOUT = 2V p-p VS = 5V G = +1 OR +2 RL = 1kΩ 2.575 HARMONIC DISTORTION (dBc) ADA4851-1/ADA4851-2/ADA4851-4 1.5 OUTPUT VOLTAGE FOR ±5V SUPPLY (V) 3.0 OUTPUT VOLTAGE FOR 5V SUPPLY (V) 6 5 4 VDISABLE G = +1 RL = 150Ω 1.0 VS = ±5V 0.5 VS = +5V 2.0 2.5 G = +2 VS = 5V fIN = 400kHz VOLTAGE (V) 3 2 1 0 VOUT 0 15 TIME (μs) 30 45 05143-033 05143-035 05143-034 0 1.5 –0.5 1.0 –1.0 0.5 0 50 100 TIME (ns) 150 Figure 24. Large Signal Transient Response for Various Supplies 0.5 05143-027 –1.5 0 200 –1 Figure 27. Enable/Disable Time 3.5 DC VOLTAGE DIFFERENTIAL FROM VS (V) 0.4 +VS – VOUT VS = ±5V 3.0 VS = ±5V SUPPLY CURRENT (mA) VS = +3V 0.3 2.5 2.0 1.5 1.0 0.5 VS = +5V 0.2 –VS – VOUT VS = +3V 0.1 0 5 10 15 20 25 30 35 05143-049 0 LOAD CURRENT (mA) 0 –5 –4 –3 –2 –1 0 1 2 3 4 5 DISABLE VOLTAGE (V) Figure 25. Output Saturation Voltage vs. Load Current 600 Figure 28. ADA4851-1, Supply Current vs. POWER DOWN Pin Voltage 300 200 500 G = +2 VS = ±5V RL = 1kΩ 25% TO 75% OF VO INPUT OFFSET VOLTAGE (μV) SLEW RATE (V/μs) 400 NEGATIVE SLEW RATE 100 VS = ±5V 0 –100 –200 –300 VS = +5V VS = +3V 300 POSITIVE SLEW RATE 200 100 0 1 2 3 4 5 6 7 8 9 10 05143-032 0 OUTPUT VOLTAGE STEP (V p-p) –400 –40 –25 –10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) Figure 26. Slew Rate vs. Output Voltage Figure 29. Input Offset Voltage vs. Temperature for Various Supplies Rev. D | Page 10 of 20 ADA4851-1/ADA4851-2/ADA4851-4 2.2 1000 G = +1 2.0 INPUT BIAS CURRENT (μA) VOLTAGE NOISE (nV/ Hz) 1.8 IB+, VS = +5V 1.6 IB+, VS = ±5V IB–, VS = ±5V 100 IB–, VS = +5V 1.4 10 100 1k 10k 100k 1M 10M 100M TEMPERATURE (°C) FREQUENCY (Hz) Figure 30. Input Bias Current vs. Temperature for Various Supplies 0.09 DC VOLTAGE DIFFERENTIAL FROM VS (V) 100 Figure 33. Voltage Noise vs. Frequency VS = ±5V 0.08 +VS – VOUT 0.07 +VS – VOUT 0.06 –VS – VOUT VS = +5V G = +2 CURRENT NOISE (pA/ Hz) 10 0.05 –VS – VOUT 10 100 1k 10k 100k 1M 10M 100M 05143-045 05143-047 –25 –10 5 20 35 50 65 80 95 110 125 05143-037 0.04 –40 1 TEMPERATURE (°C) FREQUENCY (Hz) Figure 31. Output Saturation vs. Temperature for Various Supplies 3.2 VS = ±5V 3.0 80 70 60 50 Figure 34. Current Noise vs. Frequency VS = ±5V N = 420 x = –260μV σ = 780μV SUPPLY CURRENT (mA) 2.8 COUNT 2.6 VS = +5V 40 30 2.4 VS = +3V 2.2 20 10 0 –25 –10 5 20 35 50 65 80 95 110 125 05143-038 2.0 –40 –4 –3 –2 –1 0 1 2 3 4 TEMPERATURE (°C) VOFFSET (mV) Figure 35. Input Offset Voltage Distribution Figure 32. Supply Current vs. Temperature for Various Supplies Rev. D | Page 11 of 20 05143-044 –25 –10 5 20 35 50 65 80 95 110 125 05143-036 1.2 –40 1 10 ADA4851-1/ADA4851-2/ADA4851-4 –30 –40 COMMON-MODE REJECTION (dB) 0 VS = ±5V –10 –20 –30 CROSSTALK (dB) –50 –60 –70 –80 –90 –100 –110 05143-020 G = +2 VS = 5V RL = 1kΩ VIN = 1V p-p DRIVE AMPS 1, 2, AND 4 LISTEN AMP 3 –40 –50 –60 –70 –80 –90 DRIVE AMP 1 LISTEN AMP 2 1k 10k 100k 1M 10M 100M 1G 1 10 FREQUENCY (MHz) 100 FREQUENCY (Hz) Figure 36. Common-Mode Rejection Ratio (CMRR) vs. Frequency 0 –10 VS = ±5V Figure 38. ADA4851-4, RTI Crosstalk vs. Frequency 0 –10 –20 G = +2 VS = 5V RL = 1kΩ VIN = 1V p-p POWER SUPPLY REJECTION (dB) –20 –30 –40 –50 –60 –70 –80 –90 –100 1k 10k 100k 1M 10M 100M 1G 05143-023 CROSSTALK (dB) –30 –40 –50 –60 –70 –80 –90 1 10 FREQUENCY (MHz) 100 05143-060 +PSR –PSR DRIVE AMP 1 LISTEN AMP 2 DRIVE AMP 2 LISTEN AMP 1 –110 100 –100 0.1 FREQUENCY (Hz) Figure 37. Power Supply Rejection (PSR) vs. Frequency Figure 39. ADA4851-2, RTI Crosstalk vs. Frequency Rev. D | Page 12 of 20 05143-055 –120 –100 0.1 ADA4851-1/ADA4851-2/ADA4851-4 CIRCUIT DESCRIPTION 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. 440 460 480 500 VOS (μV) 520 540 560 580 600 HEADROOM CONSIDERATIONS 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. 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. 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. –6 –5 –4 –3 –2 –1 VCM (V) 0 1 2 3 4 Figure 40. VOS vs. Common-Mode Voltage, VS = ±5 V 2 1 0 –1 G = +1 RL = 1kΩ VS = 5V VCM = 3.0V VCM = 3.1V GAIN (dB) –2 –3 –4 –5 –6 0.1 VCM = 3.2V VCM = 3.3V 1 10 FREQUENCY (MHz) 100 1000 Figure 41. Unity-Gain Follower Bandwidth vs. Input Common-Mode Rev. D | Page 13 of 20 05143-050 05143-046 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. 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. 3.6 3.4 3.2 G = +1 RL = 1kΩ VS = 5V 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. 3.50 G = +1 RL = 1kΩ VS = 5V VSTEP = 2.25V TO 3.25V VSTEP = 2.25V TO 3.5V, 4V, AND 5V 3.25 OUTPUT VOLTAGE (V) 3.00 2.75 2.50 2.25 OUTPUT VOLTAGE (V) 3.0 2.8 2.6 2.4 2.2 2.0 1.8 0 10 20 30 40 50 TIME (ns) 60 70 80 90 100 VSTEP = 2V TO 3V VSTEP = 2.1V TO 3.1V VSTEP = 2.2V TO 3.2V VSTEP = 2.3V TO 3.3V VSTEP = 2.4V TO 3.4V 0 100 200 300 400 500 600 700 800 900 1k TIME (ns) Figure 43. Pulse Response of G = 1 Follower, Input Step Overloading the Input Stage Output 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. 7 6 VOUT = 5V TO 2.5V G = –1 RL = 1kΩ VS = 5V Figure 42. Output Rising Edge for 1 V Step at Input Headroom Limits 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. 05143-052 5 4 3 2 1 0 –1 –2 0 10 20 30 40 50 TIME (ns) 60 70 80 90 100 INPUT VOLTAGE EDGES VOUT = 0V TO 2.5V OVERLOAD BEHAVIOR AND RECOVERY Input 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. Figure 44. Overload Recovery Rev. D | Page 14 of 20 05143-053 05143-051 2.00 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 C1 2.2μF + RG PD U1 VIN IOUT R2 R3 47Ω 125Ω C1 51pF R4 2kΩ 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. C2 51pF +3V C2 0.01μF V′ 75Ω 75Ω CABLE VOUT 05143-059 VIDEO DAC R6 6.8Ω R7 68.1Ω C4 1nF R8 75Ω R1 37.4Ω VOUT 75Ω Table 6. Recommended Values Supply Voltage (V) 3 3 5 Input Range (V) 0 to 0.8 0 to 0.8 0 to 2.8 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 Figure 46. 8 MHz Video Reconstruction Filter Schematic 5dB/REF –15dB 1: –3.3931dB 8.239 626MHz 1 VIDEO RECONSTRUCTION FILTER 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. 05143-062 0.03 0.1 1 FREQUENCY (MHz) 10 100 Figure 47. Video Reconstruction Filter Frequency Performance Rev. D | Page 15 of 20 05143-061 Figure 45. Video Amplifier R5 1kΩ C3 6.8pF ADA4851-1/ADA4851-2/ADA4851-4 OUTLINE DIMENSIONS 2.90 BSC 6 5 4 1.60 BSC 1 2 3 2.80 BSC PIN 1 INDICATOR 0.95 BSC 1.30 1.15 0.90 1.90 BSC 1.45 MAX 0.50 0.30 0.22 0.08 10° 4° 0° 0.60 0.45 0.30 0.15 MAX SEATING PLANE 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 3.20 3.00 2.80 PIN 1 8 5 1 5.15 4.90 4.65 4 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 49. 8-Lead Mini Small Outline Package [MSOP] (RM-8) Dimensions shown in millimeters Rev. D | Page 16 of 20 ADA4851-1/ADA4851-2/ADA4851-4 5.10 5.00 4.90 14 8 4.50 4.40 4.30 1 7 6.40 BSC 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) 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 Z = Pb-free part. Rev. D | Page 17 of 20 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