ANALOG DEVICES AD8055

Low Cost, 300 MHz Voltage Feedback Amplifiers AD8055/AD8056 FEATURES CONNECTION DIAGRAMS Low cost single (AD8055) and dual (AD8056) 1 NC 8 NC 1 V 5 +V OUT S Easy-to-use voltage feedback architecture 2 –IN 7 +V S High speed –V 2 S 3 +IN 6 V OUT 300 MHz, −3 dB bandwidth (G = +1) 3 +IN 4 –IN –V 4 5 NC S 1400 V/μs slew rate AD8055 AD8055 20 ns settling to 0.1% NC = NO CONNECT Low distortion: −72 dBc @ 10 MHz Figure 1. N-8 and R-8 Figure 2. RJ-5 Low noise: 6 nV/√Hz OUT1 1 8 +V Low dc errors: 5 mV max V , 1.2 μA max I S OS B –IN1 2 7 OUT Small packaging AD8055 available in 5-lead SOT-23 +IN1 3 6 –IN2 AD8056 available in 8-lead MSOP 4 5 –V +IN2 S AD8056 Excellent video specifications (RL = 150 Ω, G = +2) Figure 3. N-8, R-8, and RM-8 Gain flatness 0.1 dB to 40 MHz 0.01% differential gain error Their 0.1 dB flatness out to 40 MHz, wide bandwidth out to 0.02° differential phase error 300 MHz, along with 1400 V/μs slew rate and 20 ns settling Drives 4 video loads (37.5 V) with 0.02% differential time, make them useful for a variety of high speed applications. Gain and 0.1° differential phase Low power, ±5 V supplies 5 mA typ/amplifier power The AD8055 and AD8056 require only 5 mA typ/amplifier of supply current and operate on a dual ±5 V or a single +12 V supply current power supply, while capable of delivering over 60 mA of load High output drive current: over 60 mA current. The AD8055 is available in a small 8-lead PDIP, an 8-lead SOIC, and a 5-lead SOT-23, while the AD8056 is available in an APPLICATIONS 8-lead MSOP. These features make the AD8055/AD8056 ideal Imaging for portable and battery-powered applications where size and Photodiode preamps power are critical. These amplifiers in the R-8, N-8, and RM-8 Video line drivers packages are available in the extended temperature range of Differential line drivers −40°C to +125°C. Professional cameras 5 Video switchers V = 100mV p-p OUT R C R = 100Ω Special effects 4 L V V IN OUT 50Ω A-to-D drivers 3 G= +1 Active filters R =0Ω 2 R F F R R G L R =100Ω C G=+2 1 R =402Ω F GENERAL DESCRIPTION 0 The AD8055 (single) and AD8056 (dual) voltage feedback –1 amplifiers offer bandwidth and slew rate typically found in –2 G=+10 current feedback amplifiers. Additionally, these amplifiers are R =909Ω F –3 easy to use and available at a very low cost. G= +5 –4 R = 1000Ω F –5 Despite their low cost, the AD8055 and AD8056 provide 0.3M 1M 10M 100M 1G FREQUENCY (Hz) excellent overall performance. For video applications, their Figure 4. Frequency Response differential gain and phase error are 0.01% and 0.02° into a 150 Ω load and 0.02% and 0.1° while driving four video loads (37.50 Ω). Rev. J 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 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. GAIN (dB) 01063-001 01063-003 01063-004 01063-002 AD8055/AD8056 TABLE OF CONTENTS Features .............................................................................................. 1 Applications..................................................................................... 12 Applications....................................................................................... 1 Four-Line Video Driver............................................................. 12 General Description ......................................................................... 1 Single-Ended-to-Differential Line Driver............................... 12 Connection Diagrams...................................................................... 1 Low Noise, Low Power Preamp................................................ 12 Revision History ............................................................................... 2 Power Dissipation Limits .......................................................... 13 Specifications..................................................................................... 3 Resistor Selection ....................................................................... 13 Absolute Maximum Ratings............................................................ 5 Driving Capacitive Loads.......................................................... 13 Maximum Power Dissipation ..................................................... 5 Outline Dimensions ....................................................................... 14 ESD Caution.................................................................................. 5 Ordering Guide .......................................................................... 16 Typical Performance Characteristics ............................................. 6 Test Circuits..................................................................................... 11 REVISION HISTORY 2/06—Rev. I to Rev. J 10/02—Rev. E to Rev. F Changes to Format .............................................................Universal Text Changes to Reflect Extended Temperature Range for Updated Outline Dimensions ....................................................... 15 R-8, N-8 Packages..............................................................................1 Changes to Ordering Guide .......................................................... 16 Changes to Specifications.................................................................2 Changes to Absolute Maximum Ratings........................................3 Figure 2 Replaced ..............................................................................3 2/04—Rev. H to Rev. I Changes to Ordering Guide .............................................................3 Changes to Features.......................................................................... 1 Outline Dimensions Updated....................................................... 11 Changes to Ordering Guide ............................................................ 3 7/01—Rev. D to Rev. E 6/03—Rev. G to Rev. H TPC 24 Replaced with New Graph .................................................7 Changes to Absolute Maximum Ratings ....................................... 3 Updated Ordering Guide................................................................. 3 3/01—Rev. C to Rev. D Updated Outline Dimensions ....................................................... 11 Edit to Curve in TPC 23 ...................................................................7 2/03—Rev. F to Rev. G 2/01—Rev. B to Rev. C Changes to Product Description .................................................... 1 Edits to Text at Top of Specifications Page (65 to 5)....................2 Changes to Specifications................................................................ 2 Change to Ordering Guide.............................................................. 3 Outline Dimensions Updated ....................................................... 11 Rev. J | Page 2 of 16 AD8055/AD8056 SPECIFICATIONS TA = 25°C, VS = ±5 V, RF = 402 Ω, RL = 100 Ω, Gain = +2, unless otherwise noted. Table 1. AD8055A/AD8056A Parameter Conditions Min Typ Max Unit DYNAMIC PERFORMANCE −3 dB Bandwidth G = +1, VO = 0.1 V p-p 220 300 MHz G=+1, VO = 2 V p-p 125 150 MHz G=+2, V = 0.1 V p-p 120 160 MHz O G=+2, V = 2 V p-p 125 150 MHz O Bandwidth for 0.1 dB Flatness V = 100 mV p-p 25 40 MHz O Slew Rate G = +1, VO = 4 V step 1000 1400 V/μs G = +2, VO = 4 V step 750 840 V/μs Settling Time to 0.1% G = +2, VO = 2 V step 20 ns Rise and Fall Time, 10% to 90% G = +1, V = 0.5 V step 2 ns O G = +1, V = 4 V step 2.7 ns O G = +2, VO = 0.5 V step 2.8 ns G = +2, VO = 4 V step 4 ns NOISE/HARMONIC PERFORMANCE Total Harmonic Distortion fC = 10 MHz, VO = 2 V p-p, RL = 1 kΩ −72 dBc fC = 20 MHz, VO = 2 V p-p, RL = 1 kΩ −57 dBc Crosstalk, Output-to-Output (AD8056) f = 5 MHz, G = +2 −60 dB Input Voltage Noise f = 100 kHz 6 nV/√Hz Input Current Noise f = 100 kHz 1 pA/√Hz Differential Gain Error NTSC, G = +2, R = 150 Ω 0.01 % L NTSC, G = +2, RL = 37.5 Ω 0.02 % Differential Phase Error NTSC, G = +2, RL = 150 Ω 0.02 Degree NTSC, G = +2, RL = 37.5 Ω 0.1 Degree DC PERFORMANCE Input Offset Voltage 3 5 mV T to T 10 mV MIN MAX Offset Drift 6 μV/°C Input Bias Current 0.4 1.2 μA TMIN to TMAX 1 μA Open-Loop Gain VO = ±2.5 V 66 71 dB TMIN to TMAX 64 dB INPUT CHARACTERISTICS Input Resistance 10 MΩ Input Capacitance 2 pF Input Common-Mode Voltage Range 3.2 ±V Common-Mode Rejection Ratio V = ±2.5 V 82 dB CM OUTPUT CHARACTERISTICS Output Voltage Swing R = 150 Ω 2.9 3.1 ±V L 1 Output Current V = ±2.0 V 55 60 mA O 1 Short-Circuit Current 110 mA Rev. J | Page 3 of 16 AD8055/AD8056 AD8055A/AD8056A Parameter Conditions Min Typ Max Unit POWER SUPPLY Operating Range ±4.0 ±5.0 ±6.0 V Quiescent Current AD8055 5.4 6.5 mA T to 125°C 7.6 mA MIN TMIN to 85°C 7.3 mA AD8056 10 12 mA TMIN to 125°C 13.9 mA T to 85°C 13.3 mA MIN Power Supply Rejection Ratio +V = +5 V to +6 V, −V = −5 V 66 72 dB S S −VS = –5 V to −6 V, +VS = +5 V 69 86 dB OPERATING TEMPERATURE RANGE AD8055ART −40 +85 °C AD8055AR, AD8055AN, AD8056AR, AD8056AN, AD8056ARM −40 +125 °C 1 Output current is limited by the maximum power dissipation in the package. See Figure 5. Rev. J | Page 4 of 16 AD8055/AD8056 ABSOLUTE MAXIMUM RATINGS Table 2. MAXIMUM POWER DISSIPATION Parameter Ratings The maximum power that can be safely dissipated by the Supply Voltage 13.2 V AD8055/AD8056 is limited by the associated rise in junction Input Voltage (Common Mode) ±V S temperature. The maximum safe junction temperature for Differential Input Voltage ±2.5 V plastic encapsulated devices is determined by the glass Output Short-Circuit Duration Observe Power transition temperature of the plastic, approximately 150°C. Derating Curves Exceeding this limit temporarily can cause a shift in parametric Storage Temperature Range N, R −65°C to +150°C performance due to a change in the stresses exerted on the die Operating Temperature Range (A Grade) −40°C to +125°C by the package. Exceeding a junction temperature of 175°C for Lead Temperature (Soldering 10 sec) 300°C an extended period can result in device failure. Stresses above those listed under Absolute Maximum Ratings While the AD8055/AD8056 are internally short-circuit may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any protected, this may not be sufficient to guarantee that the other conditions above those indicated in the operational maximum junction temperature (150°C) is not exceeded under all conditions. To ensure proper operation, it is necessary to section of this specification is not implied. Exposure to absolute observe the maximum power derating curves. maximum rating conditions for extended periods may affect device reliability. 2.5 2.0 PDIP-8 SOIC-8 1.5 1.0 MSOP-8 0.5 SOT-23-5 0 –55 –45 –35 –25 –15 –5 5 15 25 35 45 55 65 75 85 95 105 115 125 AMBIENT TEMPERATURE (°C) Figure 5. Plot of Maximum Power Dissipation vs. Temperature for AD8055/AD8056 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. J | Page 5 of 16 MAXIMUM POWER DISSIPATION (W) 01063-005 AD8055/AD8056 TYPICAL PERFORMANCE CHARACTERISTICS 0V 0V 20mV 5ns 1V 5ns Figure 6. Small Step Response, G = +1 (See Figure 34) Figure 9. Large Step Response, G = −1 (See Figure 35) 5 V = 100mV p-p R OUT C R = 100Ω 4 L V V IN OUT 50Ω 3 G= +1 R =0Ω 2 R F F R R G L R =100Ω C G=+2 1 R =402Ω F 0V 0 –1 –2 G=+10 R =909Ω F –3 G= +5 –4 1V 5ns R = 1000Ω F –5 0.3M 1M 10M 100M 1G FREQUENCY (Hz) Figure 7. Large Step Response, G = +1 (See Figure 34) Figure 10. Small Signal Frequency Response, G = +1, G = +2, G = +5, G = +10 5 V =2Vp-p OUT R = 100Ω L 4 3 2 G= +1 1 R =0Ω F 0V 0 G=+2 –1 R =402Ω F –2 G=+10 R =909Ω F –3 G= +5 20mV 5ns –4 R = 1000Ω F –5 0.3M 1M 10M 100M 1G FREQUENCY (Hz) Figure 8. Small Step Response, G = −1 (See Figure 35) Figure 11. Large Signal Frequency Response, G = +1, G = +2, G = +5, G = +10 Rev. J | Page 6 of 16 01063-008 01063-007 01063-010 GAIN (dB) GAIN (dB) 01063-011 01063-012 01063-013 AD8055/AD8056 0.5 –40 V = 100mV OUT 0.4 G=+2 R =100Ω G=+2 L 0.3 –50 R =402Ω R =1kΩ F L 0.2 0.1 –60 0 SECOND –0.1 –70 –0.2 THIRD –0.3 –80 –0.4 –0.5 –90 0.3M 1M 10M 100M 1G 0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 3.6 4.0 V (V p-p) FREQUENCY (Hz) OUT Figure 12. 0.1 dB Flatness Figure 15. Distortion vs. V @ 20 MHz OUT –50 10 G= +1 V =2Vp-p OUT 9 R = 100Ω L G= +2 R =0Ω F R = 100Ω L –60 8 7 SECOND –70 6 5 FALL TIME –80 4 THIRD 3 –90 2 RISE TIME 1 –100 0 10k 100k 1M 10M 100M 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 FREQUENCY (Hz) V (V p-p) IN Figure 13. Harmonic Distortion vs. Frequency Figure 16. Rise Time and Fall Time vs. V IN 10 –50 G=+1 9 R =1kΩ L V =2Vp-p OUT R =0Ω F G= +2 8 R =1kΩ L –60 7 6 –70 5 4 FALL TIME –80 SECOND 3 2 –90 RISE TIME 1 THIRD 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 –100 V (V p-p) 10k 100k 1M 10M 100M IN FREQUENCY (Hz) Figure 17. Rise Time and Fall Time vs. VIN Figure 14. Harmonic Distortion vs. Frequency Rev. J | Page 7 of 16 HARMONIC DISTORTION (dBc) HARMONIC DISTORTION (dBc) OUTPUT (dB) 01063-014 01063-016 01063-015 RISE TIME AND FALL TIME (ns) RISE TIME AND FALL TIME (ns) DISTORTION (dBc) 01063-019 01063-018 01063-017 AD8055/AD8056 0.7 10 V =0VTO +2V OR G=+2 OUT 0.6 V =0VTO –2V 0 R =402Ω OUT F G=+2 0.5 R =100Ω L –10 0.4 –20 0.3 –30 0.2 –PSRR –40 0.1 0 –50 +PSRR –0.1 –60 –0.2 –70 –0.3 –80 –0.4 –90 –0.5 0 1020 304050 60 0.1 1 10 100 500 TIME (ns) FREQUENCY (MHz) Figure 18. Settling Time Figure 21. PSRR vs. Frequency 10 G=+2 V IN R =100Ω 9 L G= +1 R =402Ω F R = 100Ω L V =±5V 8 S V OUT 7 6 5 4 RISE TIME 3 2 FALL TIME 1 1V 50ns 0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 V (V p-p) IN Figure 19. Rise Time and Fall Time vs. V IN Figure 22. Overload Recovery 5.0 G=+2 –20 4.5 R =1kΩ L V =0dBm IN R =402Ω F –30 G=+2 4.0 R =100Ω L R =402Ω –40 F 3.5 RISE TIME –50 3.0 –60 2.5 SIDE 2 DRIVEN –70 2.0 FALL TIME –80 1.5 SIDE 1 DRIVEN –90 1.0 –100 0.5 –110 0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 –120 V (V p-p) IN 0.1 1 10 100 200 FREQUENCY (MHz) Figure 20. Rise Time and Fall Time vs. V IN Figure 23. Crosstalk (Output-to-Output) vs. Frequency Rev. J | Page 8 of 16 RISE TIME AND FALL TIME (ns) RISE TIME AND FALL TIME (ns) ERROR (%) 01063-022 01063-021 01063-020 CROSSTALK (dB) PSRR (dB) 01063-024 01063-025 01063-023 AD8055/AD8056 0 402Ω 402Ω –10 180 50Ω –20 402Ω 135 –30 58Ω 402Ω –40 90 –50 45 –60 –70 0 –80 –45 –90 –90 –100 10k 100k 1M 10M 100M 500M 0.1 1 10 100 500 FREQUENCY (Hz) FREQUENCY (MHz) Figure 24. CMRR vs. Frequency Figure 27. Phase vs. Frequency 0.04 G= +2 V (1V/DIV) 1 BACK TERMINATED LOAD (150Ω) IN R = 100Ω L 0.02 R = 402Ω F V =±5V S V (2V/DIV) OUT 0 G= +2 –0.02 R = 402Ω F –0.04 1ST 2ND 3RD 4TH 5TH 6TH 7TH 8TH 9TH 10TH 11TH IRE 0.04 1 BACK TERMINATED LOAD (150Ω) 0.02 0 –0.02 G= +2 50ns R = 402Ω F –0.04 1ST 2ND 3RD 4TH 5TH 6TH 7TH 8TH 9TH 10TH 11TH IRE Figure 25. Overload Recovery Figure 28. Differential Gain and Differential Phase 90 0.04 4 VIDEO LOADS (37.5Ω) 80 0.02 R =100Ω L 70 0 60 G= +2 –0.02 R = 402Ω F 50 –0.04 1ST 2ND 3RD 4TH 5TH 6TH 7TH 8TH 9TH 10TH 11TH 40 IRE 0.15 30 4 VIDEO LOADS (37.5Ω) 0.10 20 0.05 0 10 –0.05 G= +2 0 –0.10 R = 402Ω F –10 –0.15 0.01 0.1 1 10 100 500 1ST 2ND 3RD 4TH 5TH 6TH 7TH 8TH 9TH 10TH 11TH FREQUENCY (MHz) IRE Figure 26. Open-Loop Gain vs. Frequency Figure 29. Differential Gain and Differential Phase Rev. J | Page 9 of 16 OPEN-LOOP GAIN (dB) CMRR (dB) 01063-027 01063-028 01063-026 DIFFERENTIAL PHASE DIFFERENTIAL GAIN (%) DIFFERENTIAL PHASE DIFFERENTIAL GAIN (%) PHASE (Degrees) (Degrees) (Degrees) 01063-029 01063-031 01063-030 AD8055/AD8056 100 5.0 V =±5V S 4.5 4.0 R =1kΩ L 3.5 10 3.0 2.5 R =150Ω L R =50Ω L 2.0 1 1.5 1.0 0.5 0.1 0 10 100 1k 10k 100k 1M 10M 50M –55 –35 –15 5 25 45 65 85 105 125 TEMPERATURE (°C) FREQUENCY (Hz) Figure 30. Output Swing vs. Temperature Figure 32. Current Noise vs. Frequency 1000 45 G=+2 40 R =402Ω F 35 30 100 25 20 15 10 6nV/ Hz 10 5 0 1 –5 10 100 1k 10k 100k 1M 10M 50M 0.01 0.1 1 10 100 500 FREQUENCY (Hz) FREQUENCY (MHz) Figure 31. Voltage Noise vs. Frequency Figure 33. Output Impedance vs. Frequency Rev. J | Page 10 of 16 VOLTAGE NOISE (nV/ Hz) ±V (V) OUT 01063-033 01063-032 |Z | (Ω) CURRENT NOISE (pA/ Hz) OUT 01063-035 01063-034 AD8055/AD8056 TEST CIRCUITS 4.7µF 402Ω +V S 0.01µF 4.7µF +V S 0.001µF 0.01µF HP8130A V IN 100Ω PULSE 7 0.001µF 3 GENERATOR V OUT T /T =1ns HP8130A R F 6 V 50Ω AD8055 IN 402Ω PULSE 7 2 100Ω GENERATOR 4 2 T /T =0.67ns 4.7µF R F 6 57Ω AD8055 V OUT 100Ω 4 0.01µF 3 4.7µF 0.001µF 0.01µF –V S 0.001µF –V S Figure 34. G = +1, RL = 100 Ω Figure 35. G = −1, RL = 100 Ω Rev. J | Page 11 of 16 01063-006 01063-009 AD8055/AD8056 APPLICATIONS FOUR-LINE VIDEO DRIVER Between these points, a feedback resistor can be used to close the loop. As in the case of a conventional op amp inverting gain The AD8055 is a useful low cost circuit for driving up to four stage, an input resistor is added to vary the gain. video lines. For such an application, the amplifier is configured for a noninverting gain of 2, as shown in Figure 36. The input The gain of this circuit from the input to AMP1 output is RF/RI, video source is terminated in 75 Ω and is applied to the high while the gain to the output of AMP2 is −R /R . The circuit F I impedance noninverting input. therefore creates a balanced differential output signal from a single-ended input. The advantage of this circuit is that the gain Each output cable is connected to the op amp output via a 75 Ω can be changed by changing a single resistor, while still series back termination resistor for proper cable termination. maintaining the balanced differential outputs. The terminating resistors at the other ends of the lines divide the output signal by 2, which is compensated for by the gain of 2 R F 402Ω of the op amp stage. +5V For a single load, the differential gain error of this circuit was 0.1µF 10µF R measured as 0.01%, with a differential phase error of 0.02°. The I 402Ω 8 3 two load measurements were 0.02% and 0.03°, respectively. For V IN 49.9Ω 1 +V AMP1 OUT four loads, the differential gain error is 0.02%, while the 2 differential phase increases to 0.1°. 402Ω 75Ω V OUT1 +5V 75Ω 402Ω 402Ω AD8056 402Ω 75Ω 0.1µF 10µF 402Ω V 402Ω OUT2 2 7 75Ω 6 AD8055 6 V 3 4 IN 49.9Ω 75Ω 7 –V AMP2 OUT 75Ω V OUT3 5 0.1µF 10µF 4 75Ω 75Ω 0.1µF 10µF 75Ω –5V V OUT4 –5V 75Ω Figure 37. Single-Ended-to-Differential Line Driver Figure 36. Four-Line Video Driver LOW NOISE, LOW POWER PREAMP SINGLE-ENDED-TO-DIFFERENTIAL LINE DRIVER The AD8055 makes a good, low cost, low noise, low power preamp. A gain-of-10 preamp can be made with a feedback Creating differential signals from single-ended signals is resistor of 909 Ω and a gain resistor of 100 Ω, as shown in required for driving balanced, twisted pair cables, differential Figure 38. The circuit has a −3 dB bandwidth of 20 MHz. input ADCs, and other applications that require differential signals. This can be accomplished by using an inverting and a 909Ω noninverting amplifier stage to create the complementary +5V signals. + 0.1µF 10µF 100Ω Figure 37 shows how an AD8056 can be 2 7 The circuit shown in 6 V AD8055 OUT used to make a single-ended-to-differential converter that offers 3 4 some advantages over the architecture previously mentioned. R S Each op amp is configured for unity gain by the feedback 0.1µF 10µF resistors from the outputs to the inverting inputs. In addition, –5V each output drives the opposite op amp with a gain of −1 by Figure 38. Low Noise, Low Power Preamp with G = +10 and BW = 20 MHz means of the crossed resistors. The result of this is that the outputs are complementary and there is high gain in the overall With a low source resistance (< approximately 100 Ω), the configuration. major contributors to the input-referred noise of this circuit are the input voltage noise of the amplifier and the noise of the Feedback techniques similar to a conventional op amp are used 100 Ω resistor. These are 6 nV/√Hz and 1.2 nV/√Hz, respectively. to control the gain of the circuit. From the noninverting input These values yield a total input referred noise of 6.1 nV/√Hz. of AMP1 to the output of AMP2 is an inverting gain. Rev. J | Page 12 of 16 01063-036 01063-038 01063-037 AD8055/AD8056 5 POWER DISSIPATION LIMITS 402Ω 4 402Ω With a 10 V supply (total VCC − VEE), the quiescent power 3 dissipation of the AD8055 in the SOT-23-5 package is 65 mW, C =30pF L C 100Ω V =0dBm L IN 2 while the quiescent power dissipation of the AD8056 in the 50Ω 1 MSOP-8 is 120 mW. This translates into a 15.6°C rise above the ambient for the SOT-23-5 package and a 24°C rise for the 0 MSOP-8 package. –1 C = 20pF L C = 10pF –2 L The power dissipated under heavy load conditions is C =0pF –3 L approximately equal to the supply voltage minus the output –4 voltage, times the load current, plus the quiescent power previously computed. The total power dissipation is then –5 0.3 1 10 100 500 multiplied by the thermal resistance of the package to find the FREQUENCY (MHz) temperature rise, above ambient, of the part. The junction Figure 39. Capacitive Load Drive temperature should be kept below 150°C. In general, to minimize peaking or to ensure the stability for The AD8055 in the SOT-23-5 package can dissipate 270 mW, larger values of capacitive loads, a small series resistor, R , can S while the AD8056 in the MSOP-8 package can dissipate be added between the op amp output and the capacitor, C . For L 325 mW (at 85°C ambient) without exceeding the maximum the setup depicted in Figure 40, the relationship between RS and die temperature. In the case of the AD8056, this is greater than CL was empirically derived and is shown in Figure 41. RS was 1.5 V rms into 50 Ω, enough to accommodate a 4 V p-p sine chosen to produce less than 1 dB of peaking in the frequency wave signal on both outputs simultaneously. However, because response. Note also that after a sharp rise, RS quickly settles to each output of the AD8055 or AD8056 is capable of supplying approximately 25 Ω. as much as 110 mA into a short circuit, a continuous short- 402Ω circuit condition will exceed the maximum safe junction +5V temperature. 0.1µF 10µF RESISTOR SELECTION 402Ω 7 2 Table 3 is a guide for resistor selection for maintaining gain R FET PROBE S 6 AD8055 V OUT flatness vs. frequency for various values of gain. C 4 L V =0dBm 3 IN Table 3. 50Ω 0.1µF 10µF Gain RF (Ω) RG (Ω) −3 dB Bandwidth (MHz) –5V +1 0 300 Figure 40. Setup for R vs. C +2 402 402 160 S L +5 1 k 249 45 40 +10 909 100 20 35 DRIVING CAPACITIVE LOADS 30 When driving a capacitive load, most op amps exhibit peaking 25 in the frequency response just before the frequency rolls off. 20 Figure 39 shows the responses for an AD8056 running at a gain of +2, with an 100 Ω load that is shunted by various values of 15 capacitance. It can be seen that under these conditions the part 10 is still stable with capacitive loads of up to 30 pF. 5 0 0 1020 3040 5060 270 C (pF) L Figure 41. RS vs. CL Rev. J | Page 13 of 16 R (Ω) NORMALIZED GAIN (dB) S 01063-039 01063-041 01063-040 AD8055/AD8056 OUTLINE DIMENSIONS 0.400 (10.16) 0.365 (9.27) 0.355 (9.02) 8 5 0.280 (7.11) 0.250 (6.35) 1 0.240 (6.10) 4 0.325 (8.26) 0.310 (7.87) PIN 1 0.300 (7.62) 0.100 (2.54) BSC 0.060 (1.52) 0.195 (4.95) 0.210 MAX 0.130 (3.30) (5.33) MAX 0.115 (2.92) 0.015 0.150 (3.81) (0.38) 0.015 (0.38) MIN 0.130 (3.30) GAUGE PLANE 0.014 (0.36) 0.115 (2.92) SEATING 0.010 (0.25) PLANE 0.008 (0.20) 0.022 (0.56) 0.005 (0.13) 0.430 (10.92) 0.018 (0.46) MIN MAX 0.014 (0.36) 0.070 (1.78) 0.060 (1.52) 0.045 (1.14) COMPLIANT TO JEDEC STANDARDS MS-001-BA CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETER DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF INCH EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. CORNER LEADS MAY BE CONFIGURED AS WHOLE OR HALF LEADS. Figure 42. 8-Lead Plastic Dual In-Line Package [PDIP] Narrow Body (N-8) Dimensions shown in inches and (millimeters) 5.00 (0.1968) 4.80 (0.1890) 85 6.20 (0.2440) 4.00 (0.1574) 5.80 (0.2284) 3.80 (0.1497) 1 4 1.27 (0.0500) 0.50 (0.0196) × 45° BSC 1.75 (0.0688) 0.25 (0.0099) 1.35 (0.0532) 0.25 (0.0098) 0.10 (0.0040) 8° 0.51 (0.0201) 0° 1.27 (0.0500) COPLANARITY 0.25 (0.0098) 0.31 (0.0122) SEATING 0.10 0.40 (0.0157) 0.17 (0.0067) PLANE 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 43. 8-Lead Standard Small Outline Package [SOIC_N] Narrow Body (R-8) Dimensions shown in millimeters and (inches) Rev. J | Page 14 of 16 AD8055/AD8056 3.20 3.00 2.80 8 5 5.15 3.20 4.90 3.00 4.65 1 2.80 4 PIN 1 0.65 BSC 0.95 0.85 1.10 MAX 0.75 0.80 8° 0.15 0.60 0.38 0.23 0° 0.40 0.00 0.22 0.08 COPLANARITY SEATING 0.10 PLANE COMPLIANT TO JEDEC STANDARDS MO-187-AA Figure 44. 8-Lead Mini Small Outline Package [MSOP] (RM-8) Dimensions shown in millimeters 2.90 BSC 5 4 2.80 BSC 1.60 BSC 12 3 PIN 1 0.95 BSC 1.90 1.30 BSC 1.15 0.90 1.45 MAX 0.22 0.08 10° 0.15 MAX 5° 0.50 0.60 SEATING 0° 0.30 PLANE 0.45 0.30 COMPLIANT TO JEDEC STANDARDS MO-178-AA Figure 45. 5-Lead Small Outline Transistor Package [SOT-23] (RJ-5) Dimensions shown in millimeters Rev. J | Page 15 of 16 AD8055/AD8056 ORDERING GUIDE Model Temperature Range Package Description Package Option Branding AD8055AN −40°C to +125°C 8-Lead PDIP N-8 1 AD8055ANZ −40°C to +125°C 8-Lead PDIP N-8 AD8055AR −40°C to +125°C 8-Lead SOIC_N R-8 AD8055AR-REEL −40°C to +125°C 8-Lead SOIC_N, 13" Tape and Reel R-8 AD8055AR-REEL7 −40°C to +125°C 8-Lead SOIC_N, 7" Tape and Reel R-8 1 AD8055ARZ −40°C to +125°C 8-Lead SOIC_N R-8 1 AD8055ARZ-REEL −40°C to +125°C 8-Lead SOIC_N, 13" Tape and Reel R-8 1 AD8055ARZ-REEL7 −40°C to +125°C 8-Lead SOIC_N, 7" Tape and Reel R-8 AD8055ART-R2 −40°C to +85°C 5-Lead SOT-23, Reel RJ-5 H3A AD8055ART-REEL −40°C to +85°C 5-Lead SOT-23, 13" Tape and Reel RJ-5 H3A AD8055ART-REEL7 −40°C to +85°C 5-Lead SOT-23, 7" Tape and Reel RJ-5 H3A 1 AD8055ARTZ-R2 −40°C to +85°C 5-Lead SOT-23, Reel RJ-5 H3A 1 2 AD8055ARTZ-REEL7 −40°C to +85°C 5-Lead SOT-23, 7" Tape and Reel RJ-5 H07 AD8056AN −40°C to +125°C 8-Lead PDIP N-8 1 AD8056ANZ −40°C to +125°C 8-Lead PDIP N-8 AD8056AR −40°C to +125°C 8-Lead SOIC_N R-8 AD8056AR-REEL −40°C to +125°C 8-Lead SOIC_N, 13" Tape and Reel R-8 AD8056AR-REEL7 −40°C to +125°C 8-Lead SOIC_N, 7" Tape and Reel R-8 1 AD8056ARZ −40°C to +125°C 8-Lead SOIC_N R-8 1 AD8056ARZ-REEL −40°C to +125°C 8-Lead SOIC_N, 13" Tape and Reel R-8 1 AD8056ARZ-REEL7 −40°C to +125°C 8-Lead SOIC_N, 7" Tape and Reel R-8 AD8056ARM −40°C to +125°C 8-Lead MSOP RM-8 H5A AD8056ARM-REEL −40°C to +125°C 8-Lead MSOP, 13" Tape and Reel RM-8 H5A AD8056ARM-REEL7 −40°C to +125°C 8-Lead MSOP, 7" Tape and Reel RM-8 H5A 1 AD8056ARMZ −40°C to +125°C 8-Lead MSOP RM-8 H5A# 1 AD8056ARMZ-REEL −40°C to +125°C 8-Lead MSOP, 13" Tape and Reel RM-8 H5A# 1 AD8056ARMZ-REEL7 −40°C to +125°C 8-Lead MSOP, 7" Tape and Reel RM-8 H5A# 1 Z = Pb-free part, # denotes lead-free product may be top or bottom marked. 2 Prior to 0542, parts were branded H3A. ©2006 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. C01063-0-2/06(J) Rev. J | Page 16 of 16