Low Cost, 300 MHz Voltage Feedback Amplifiers AD8055/AD8056 FEATURES Low Cost Single (AD8055) and Dual (AD8056) Easy to Use Voltage Feedback Architecture High Speed 300 MHz, –3 dB Bandwidth (G = +1) 1400 V/␮s Slew Rate 20 ns Settling to 0.1% Low Distortion: –72 dBc @ 10 MHz Low Noise: 6 nV/÷Hz Low DC Errors: 5 mV Max VOS, 1.2 ␮A Max IB Small Packaging AD8055 Available in SOT-23-5 AD8056 Available in 8-Lead MSOP Excellent Video Specifications (RL = 150 ⍀, G = +2) Gain Flatness 0.1 dB to 40 MHz 0.01% Differential Gain Error 0.02ⴗ Differential Phase Error Drives 4 Video Loads (37.5 V) with 0.02% Differential Gain and 0.1ⴗ Differential Phase Low Power, ⴞ5 V Supplies 5 mA Typ/Amplifier Power Supply Current High Output Drive Current: Over 60 mA APPLICATIONS Imaging Photodiode Preamp Video Line Drivers Differential Line Drivers Professional Cameras Video Switchers Special Effects A-to-D Drivers Active Filters FUNCTIONAL BLOCK DIAGRAMS N-8 and R-8 RT-5 AD8055 NC 1 –IN 2 7 +VS +IN 3 6 VOUT –VS 4 5 +VS –VS 2 5 NC 4 –IN +IN 3 (Not to Scale) NC = NO CONNECT N-8, R-8, RM-8 OUT1 1 AD8056 8 +VS –IN1 2 7 OUT +IN1 3 6 –IN2 –VS 4 5 +IN2 (Not to Scale) 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 power supply, while capable of delivering over 60 mA of load current. All this is offered in a small 8-lead PDIP package, 8-lead SOIC packages, a 5-lead SOT-23-5 package (AD8055), and an 8-lead MSOP package (AD8056). These features make the AD8055/AD8056 ideal for portable and battery-powered applications where size and power are critical. These amplifiers in the R-8, N-8, and RM packages are available in the extended temperature range of –40∞C to +125∞C. 5 4 RC VIN VOUT 50⍀ 2 GAIN – dB PRODUCT DESCRIPTION Despite their low cost, the AD8055 and AD8056 provide excellent overall performance. For video applications, their differential gain and phase error are 0.01% and 0.02∞ into a 150 W load and 0.02% and 0.1∞ while driving four video loads (37.50 W). Their 0.1 dB flatness out to 40 MHz, wide bandwidth out to 300 MHz, along with 1400 V/ms slew rate and 20 ns settling time, make them useful for a variety of high speed applications. VOUT 1 (Not to Scale) 3 The AD8055 (single) and AD8056 (dual) voltage feedback amplifiers offer bandwidth and slew rate typically found in current feedback amplifiers. Additionally, these amplifiers are easy to use and available at a very low cost. AD8055 8 NC RG RL RF VOUT = 100mV p-p RL = 100⍀ G = +1 RF = 0⍀ RC = 100⍀ 1 G = +2 RF = 402⍀ 0 –1 –2 G = +10 RF = 909⍀ –3 G = +5 RF = 1000⍀ –4 –5 0.3M 1M 10M 100M FREQUENCY – Hz 1G Figure 1. Frequency Response REV. I 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. 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: 781/326-8703 © 2004 Analog Devices, Inc. All rights reserved. AD8055/AD8056–SPECIFICATIONS Parameter DYNAMIC PERFORMANCE –3 dB Bandwidth Bandwidth for 0.1 dB Flatness Slew Rate Settling Time to 0.1% Rise and Fall Time, 10% to 90% NOISE/HARMONIC PERFORMANCE Total Harmonic Distortion Crosstalk, Output-to-Output (AD8056) Input Voltage Noise Input Current Noise Differential Gain Error Differential Phase Error (@ TA = 25ⴗC, VS = ⴞ5 V, RF = 402 ⍀, RL = 100 ⍀, Gain = +2, unless otherwise noted.) AD8055A/AD8056A Min Typ Max Conditions G = +1, VO = 0.1 V p-p G = +1, VO = 2 V p-p G = +2, VO = 0.1 V p-p G = +2, VO = 2 V p-p VO = 100 mV p-p G = +1, VO = 4 V Step G = +2, VO = 4 V Step G = +2, VO = 2 V Step G = +1, VO = 0.5 V Step G = +1, VO = 4 V Step G = +2, VO = 0.5 V Step G = +2, VO = 4 V Step 220 125 120 125 25 1000 750 fC = 10 MHz, VO = 2 V p-p, RL = 1 kW fC = 20 MHz, VO = 2 V p-p, RL = 1 kW f = 5 MHz, G = +2 f = 100 kHz f = 100 kHz NTSC, G = +2, RL = 150 W NTSC, G = +2, RL = 37.5 W NTSC, G = +2, RL = 150 W NTSC, G = +2, RL = 37.5 W DC PERFORMANCE Input Offset Voltage 300 150 160 150 40 1400 840 20 2 2.7 2.8 4 MHz MHz MHz MHz MHz V/ms V/ms ns ns ns ns ns –72 –57 –60 6 1 0.01 0.02 0.02 0.1 dBc dBc dB nV/÷Hz pA/÷Hz % % Degree Degree 3 TMIN to TMAX Offset Drift Input Bias Current Open-Loop Gain INPUT CHARACTERISTICS Input Resistance Input Capacitance Input Common-Mode Voltage Range Common-Mode Rejection Ratio OUTPUT CHARACTERISTICS Output Voltage Swing Output Current* Short Circuit Current* POWER SUPPLY Operating Range Quiescent Current Power Supply Rejection Ratio OPERATING TEMPERATURE RANGE TMIN to TMAX VO = ± 2.5 V TMIN to TMAX 66 64 AD8055 TMIN to 125∞C TMIN to 85∞C AD8056 TMIN to 125∞C TMIN to 85∞C +VS = +5 V to +6 V, –VS = –5 V –VS = –5 V to –6 V, +VS = +5 V AD8055ART AD8055AR, AD8055AN, AD8056AR, AD8056AN, AD8056ARM 6 0.4 1 71 5 10 1.2 mV mV mV/∞C mA mA dB dB 10 2 3.2 82 MW pF ±V dB 2.9 55 3.1 60 110 ±V mA mA ± 4.0 ± 5.0 5.4 7.6 VCM = ± 2.5 V RL = 150 W VO = ± 2.0 V Unit 10 13.9 ± 6.0 6.5 7.3 12 13.3 66 69 –40 –40 72 86 +85 +125 V mA mA mA mA mA mA dB dB ∞C ∞C *Output current is limited by the maximum power dissipation in the package. See the power derating curves. Specifications subject to change without notice. –2– REV. I AD8055/AD8056 ABSOLUTE MAXIMUM RATINGS* While the AD8055/AD8056 are internally short-circuit protected, this may not be sufficient to guarantee that the maximum junction temperature (150°C) is not exceeded under all conditions. To ensure proper operation, it is necessary to observe the maximum power derating curves. Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.2 V Input Voltage (Common-Mode) . . . . . . . . . . . . . . . . . . . . ± VS Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . ± 2.5 V Output Short Circuit Duration . . . . . . . . . . . . . . . . . . . . . . . Observe Power Derating Curves Storage Temperature Range N, R . . . . . . . . . –65°C to +150°C Operating Temperature Range (A Grade) . . . –40°C to +125°C Lead Temperature Range (Soldering 10 sec) . . . . . . . . . 300°C MAXIMUM POWER DISSIPATION – W 2.5 *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. MAXIMUM POWER DISSIPATION The maximum power that can be safely dissipated by the AD8055/AD8056 is limited by the associated rise in junction temperature. The maximum safe junction temperature for plastic encapsulated devices is determined by the glass transition temperature of the plastic, approximately 150°C. Exceeding this limit temporarily may cause a shift in parametric performance due to a change in the stresses exerted on the die by the package. Exceeding a junction temperature of 175°C for an extended period can result in device failure. 2.0 PDIP-8 SOIC-8 1.5 1.0 MSOP-8 0.5 SOT-23-5 0.0 –55 –45 –35 –25 –15 –5 5 15 25 35 45 55 65 75 85 95 105 115 125 AMBIENT TEMPERATURE – ⴗC Figure 2. Plot of Maximum Power Dissipation vs. Temperature for AD8055/AD8056 ORDERING GUIDE Model Temperature Range Package Description Package Option AD8055AN AD8055AR AD8055AR-REEL AD8055AR-REEL7 AD8055ARZ* AD8055ART-R2 AD8055ART-REEL AD8055ART-REEL7 AD8055ARTZ-REEL7* AD8056AN AD8056AR AD8056AR-REEL AD8056AR-REEL7 AD8056ARZ* AD8056ARZ-REEL7* AD8056ARM AD8056ARM-REEL AD8056ARM-REEL7 AD8056ARMZ* AD8056ARMZ-REEL* AD8056ARMZ-REEL7* –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 +85°C –40°C to +85°C –40°C to +85°C –40°C to +85°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 –40°C to +125°C –40°C to +125°C –40°C to +125°C –40°C to +125°C PDIP SOIC 13" Tape and Reel 7" Tape and Reel SOIC Reel (SOT-23) 13" Tape and Reel 7" Tape and Reel 7" Tape and Reel PDIP SOIC 13" Tape and Reel 7" Tape and Reel SOIC 7" Tape and Reel MSOP 13" Tape and Reel 7" Tape and Reel MSOP 13" Tape and Reel 7" Tape and Reel N-8 R-8 R-8 R-8 R-8 RT-5 RT-5 RT-5 RT-5 N-8 R-8 R-8 R-8 R-8 R-8 RM-8 RM-8 RM-8 RM-8 RM-8 RM-8 *This is a lead-free product. 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 the AD8055/AD8056 feature 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. I –3– Branding Code H3A H3A H3A H3A H5A H5A H5A H5A H5A H5A AD8055/AD8056–Typical Performance Characteristics 402⍀ +VS 4.7␮F +VS 0.01␮F 0.01␮F 0.001␮F HP8130A PULSE GENERATOR TR /TF = 1ns VIN 100⍀ 3 2 0.001␮F HP8130A PULSE GENERATOR TR/TF = 0.67ns 7 AD8055 50⍀ 4 VOUT 6 4.7␮F 4.7␮F VIN 402⍀ 2 7 AD8055 57⍀ 6 VOUT 100⍀ 3 4 0.01␮F 4.7␮F 100⍀ 0.01␮F 0.001␮F 0.001␮F –VS –VS TPC 1. Test Circuit, G = +1, RL = 100 W TPC 4. Test Circuit, G = –1, RL = 100 W TPC 2. Small Step Response, G = +1 TPC 5. Small Step Response, G = –1 TPC 3. Large Step Response, G = +1 TPC 6. Large Step Response, G = –1 –4– REV. I AD8055/AD8056 –50 5 VIN VOUT 50⍀ 3 RG GAIN – dB 2 RF RL VOUT = 100mV p-p RL = 100⍀ HARMONIC DISTORTION – dBc 4 RC G = +2 RF = 402⍀ G = +1 RF = 0⍀ RC = 100⍀ 1 0 –1 –2 G = +10 RF = 909⍀ –3 SECOND –70 –80 THIRD –90 G = +5 RF = 1000⍀ –4 –5 0.3M VOUT = 2V p-p G = +2 RL = 100⍀ –60 1M –100 10k 1G 10M 100M FREQUENCY – Hz TPC 7. Small Signal Frequency Response, G = +1, G = +2, G = +5, G = +10 HARMONIC DISTORTION – dBc VOUT = 2V p-p RL = 100⍀ 3 2 GAIN – dB 100M 10M –50 4 G = +1 RF = 0⍀ 1 0 G = +2 RF = 402⍀ –1 –2 G = +10 RF = 909⍀ –3 VOUT = 2V p-p G = +2 RL = 1k⍀ –60 –70 –80 SECOND –90 THIRD G = +5 RF = 1000⍀ –4 1M 10M 100M FREQUENCY – Hz –100 10k 1G TPC 8. Large Signal Frequency Response, G = +1, G = +2, G = +5, G = +10 100k 1M FREQUENCY – Hz 10M 100M TPC 11. Harmonic Distortion vs. Frequency 0.5 –40 VOUT = 100mV G = +2 RL = 100⍀ RF = 402⍀ 0.4 0.3 G = +2 RL = 1k⍀ –50 DISTORTION – dBc 0.2 OUTPUT – dB 1M FREQUENCY – Hz TPC 10. Harmonic Distortion vs. Frequency 5 –5 0.3M 100k 0.1 0 –0.1 –0.2 –0.3 –60 SECOND –70 THIRD –80 –0.4 –0.5 0.3M 1M 10M 100M FREQUENCY – Hz –90 1G 0.4 0.8 1.2 2.0 2.4 1.6 VOUT – V p-p 2.8 3.2 3.6 TPC 12. Distortion vs. VOUT @ 20 MHz TPC 9. 0.1 dB Flatness REV. I 0 –5– 4.0 AD8055/AD8056 10 10 G = +1 R L = 100⍀ RF = 0⍀ 8 7 6 5 FALL TIME 4 3 2 RISE TIME 1 0 7 6 5 4 0.5 1.0 1.5 2.0 2.5 3.0 VIN – V p-p 3.5 RISE TIME 3 2 FALL TIME 1 4.0 4.5 5.0 0 0.2 0.4 0.6 0.8 1.0 VIN – V p-p 1.2 1.4 1.6 TPC 16. Rise Time and Fall Time vs. VIN TPC 13. Rise Time and Fall Time vs. VIN 5.0 10 G = +1 R L = 1k⍀ RF = 0⍀ 8 4.5 RISE TIME AND FALL TIME – ns 9 RISE TIME AND FALL TIME – ns 8 0 0 G = +2 RL = 100⍀ RF = 402⍀ 9 RISE TIME AND FALL TIME – ns RISE TIME AND FALL TIME – ns 9 7 6 5 4 FALL TIME 3 2 4.0 G = +2 RL = 1k⍀ RF = 402⍀ 3.5 RISE TIME 3.0 2.5 2.0 FALL TIME 1.5 1.0 RISE TIME 0.5 1 0 0 0 0 0.5 1.0 1.5 2.0 2.5 3.0 VIN – V p-p 3.5 4.0 4.5 5.0 0.2 0.4 0.6 0.8 1.0 VIN – V p-p 1.2 1.4 1.6 TPC 17. Rise Time and Fall Time vs. VIN TPC 14. Rise Time and Fall Time vs. VIN 10 0.7 V OUT = 0V TO +2V OR V OUT = 0V TO –2V G = +2 R L = 100⍀ 0.6 0.5 0.4 0 G = +2 RF = 402⍀ –10 –20 PSRR – dB ERROR – % 0.3 0.2 0.1 0 –0.1 –30 –PSRR –40 –50 +PSRR –60 –0.2 –70 –0.3 –80 –0.4 –0.5 0 10 20 30 TIME – ns 40 50 –90 0.1 60 TPC 15. Settling Time 1 10 FREQUENCY – MHz 100 500 TPC 18. PSRR vs. Frequency –6– REV. I AD8055/AD8056 G = +2 RL = 100⍀ RF = 402⍀ VS = ⴞ5V TPC 19. Overload Recovery 90 CROSSTALK – dB VIN = 0dBm G = +2 RL = 100⍀ RF = 402⍀ 80 RL = 100⍀ 70 OPEN-LOOP GAIN – dB –30 –50 –60 VOUT (2V/DIV) TPC 22. Overload Recovery –20 –40 VIN (1V/DIV) SIDE 2 DRIVEN –70 –80 SIDE 1 DRIVEN –90 60 50 40 30 20 –100 10 –110 0 –120 0.1 1 10 FREQUENCY – MHz 100 –10 0.01 200 TPC 20. Crosstalk (Output-to-Output) vs. Frequency 0.1 1 10 FREQUENCY – MHz 100 500 TPC 23. Open-Loop Gain vs. Frequency 0 –10 –20 402⍀ 402⍀ 180 50⍀ 402⍀ 135 CMRR – dB 58⍀ PHASE – Degrees –30 402⍀ –40 –50 –60 –70 90 45 0 –80 –45 –90 –100 0.1 1 10 FREQUENCY – MHz 100 –90 10k 500 TPC 21. CMRR vs. Frequency REV. I 100k 1M 10M FREQUENCY – Hz 100M TPC 24. Phase vs. Frequency –7– 500M DIFFERENTIAL PHASE – DIFFERENTIAL GAIN – % Degrees AD8055/AD8056 1000 0.04 1 BACK TERMINATED LOAD (150⍀) 0.02 –0.02 –0.04 VOLTAGE NOISE – nV/ Hz 0.00 G = +2 RF = 402⍀ 1ST 2ND 3RD 4TH 5TH 6TH 7TH 8TH 9TH 10TH 11TH IRE 0.04 1 BACK TERMINATED LOAD (150⍀) 0.02 0.00 –0.02 100 10 G = +2 RF = 402⍀ 1 10 –0.04 1ST 2ND 3RD 4TH 5TH 6TH 7TH 8TH 9TH 10TH 11TH IRE 100 1k 10k 100k FREQUENCY – Hz 1M 10M 50M TPC 28. Voltage Noise vs. Frequency 100 0.04 4 VIDEO LOADS (37.5⍀) 0.02 0.00 –0.02 CURRENT NOISE – pA/ Hz DIFFERENTIAL PHASE – DIFFERENTIAL GAIN – % Degrees TPC 25. Differential Gain and Differential Phase G = +2 RF = 402⍀ –0.04 1ST 2ND 3RD 4TH 5TH 6TH 7TH 8TH 9TH 10TH 11TH IRE 0.15 4 VIDEO LOADS (37.5⍀) 0.10 0.05 0.00 –0.05 –0.10 –0.15 G = +2 RF = 402⍀ 10 1 0.1 10 1ST 2ND 3RD 4TH 5TH 6TH 7TH 8TH 9TH 10TH 11TH IRE TPC 26. Differential Gain and Differential Phase 40 4.0 25 2.0 | ZOUT | – ⍀ 30 3.0 RL = 150⍀ RL = 50⍀ 1M 10M 50M G = +2 RF = 402⍀ 20 15 1.5 10 1.0 5 0.5 0 –55 10k 100k FREQUENCY – Hz 35 RL = 1k⍀ 3.5 2.5 1k 45 VS = ⴞ5V 4.5 100 TPC 29. Current Noise vs. Frequency 5.0 ⴞVOUT – V 6nV/ Hz 0 –35 –15 5 25 45 65 TEMPERATURE – ⴗC 85 105 –5 0.01 125 TPC 27. Output Swing vs. Temperature 0.1 1 10 FREQUENCY – MHz 100 500 TPC 30. Output Impedance vs. Frequency –8– REV. I AD8055/AD8056 The gain of this circuit from the input to AMP1 output is RF/RI, while the gain to the output of AMP2 is –RF /RI. The circuit thus creates a balanced differential output signal from a singleended input. The advantage of this circuit is that the gain can be changed by changing a single resistor, while still maintaining the balanced differential outputs. APPLICATIONS Four-Line Video Driver The AD8055 is a useful low cost circuit for driving up to four video lines. For such an application, the amplifier is configured for a noninverting gain-of-2 as shown in Figure 3. The input video source is terminated in 75 W and applied to the high impedance noninverting input. Each output cable is connected to the op amp output via a 75 W series back termination resistor for proper cable termination. The terminating resistors at the other ends of the lines will divide the output signal by 2, which is compensated for by the gain-of-2 of the op amp stage. RF 402⍀ +5V 0.1␮F RI 402⍀ For a single load, the differential gain error of this circuit was measured to be 0.01%, with a differential phase error of 0.02∞. The two load measurements were 0.02% and 0.03∞, respectively. For four loads, the differential gain error is 0.02%, while the differential phase increases to 0.1∞. VIN 3 10␮F 8 49.9⍀ AMP1 +VOUT 1 2 402⍀ 402⍀ AD8056 75⍀ 0.1␮F 402⍀ 3 10␮F 75⍀ VOUT2 7 6 6 5 4 0.1␮F –5V 4 VOUT3 10␮F 0.1␮F 75⍀ 10␮F –5V Figure 4. Single-Ended-to-Differential Line Driver 75⍀ VOUT4 Low Noise, Low Power Preamp 75⍀ The AD8055 makes a good, low cost, low noise, low power preamp. A gain-of-10 preamp can be made with a feedback resistor of 909 W and a gain resistor of 100 W as shown in Figure 5. The circuit has a –3 dB bandwidth of 20 MHz. Figure 3. Four-Line Video Driver Single-Ended-to-Differential Line Driver Creating differential signals from single-ended signals is required for driving balanced, twisted pair cables, differential input A/D converters, and other applications that require differential signals. This is sometimes accomplished by using an inverting and a noninverting amplifier stage to create the complementary signals. 909⍀ +5V 0.1␮F 100⍀ 2 The circuit shown in Figure 4 shows how an AD8056 can be used to make a single-ended-to-differential converter that offers some advantages over the architecture mentioned above. Each op amp is configured for unity gain by the feedback resistors from the outputs to the inverting inputs. In addition, each output drives the opposite op amp with a gain of –1 by means of the crossed resistors. The result of this is that the outputs are complementary and there is high gain in the overall configuration. 3 + 10␮F 7 AD8055 VOUT 6 4 RS 0.1␮F 10␮F –5V Figure 5. Low Noise, Low Power Preamp with G = +10 and BW = 20 MHz Feedback techniques similar to a conventional op amp are used to control the gain of the circuit. From the noninverting input of AMP1 to the output of AMP2 is an inverting gain. Between these points a feedback resistor can be used to close the loop. As in the case of a conventional op amp inverting gain stage, an input resistor is added to vary the gain. REV. I –VOUT 7 75⍀ 75⍀ 75⍀ 49.9⍀ AMP2 75⍀ AD8055 VIN 402⍀ 75⍀ 402⍀ 2 402⍀ VOUT1 +5V With a low source resistance (< approximately 100 W), the major contributors to the input referred noise of this circuit are the input voltage noise of the amplifier and the noise of the 100 W resistor. These are 6 nV/÷Hz and 1.2 nV/÷Hz, respectively. These values yield a total input referred noise of 6.1 nV/÷Hz. –9– AD8055/AD8056 Power Dissipation Limits 5 With a 10 V supply (total VCC – VEE), the quiescent power dissipation of the AD8055 in the SOT-23-5 package is 65 mW, while the quiescent power dissipation of the AD8056 in the MSOP 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 MSOP package. 402⍀ NORMALIZED GAIN – dB CL VIN = 0dBm 2 100⍀ 50⍀ 1 0 –1 CL = 20pF –2 CL = 10pF –3 CL = 0pF –4 The AD8055 in the SOT-23-5 package can dissipate 270 mW while the AD8056 in the MSOP package can dissipate 325 mW (at 85∞C ambient) without exceeding the maximum die temperature. In the case of the AD8056, this is greater than 1.5 V rms into 50 W, enough to accommodate a 4 V p-p sine wave signal on both outputs simultaneously. But since each output of the AD8055 or AD8056 is capable of supplying as much as 110 mA into a short circuit, a continuous short circuit condition will exceed the maximum safe junction temperature. This table is provided as a guide to resistor selection for maintaining gain flatness versus frequency for various values of gain. CL = 30pF 3 The power dissipated under heavy load conditions is approximately equal to the supply voltage minus the output voltage, times the load current, plus the quiescent power computed above. This total power dissipation is then multiplied by the thermal resistance of the package to find the temperature rise, above ambient, of the part. The junction temperature should be kept below 150∞C. Resistor Selection 402⍀ 4 –5 0.3 1 10 FREQUENCY – MHz 100 500 Figure 6. Capacitive Load Drive In general, to minimize peaking or to ensure the stability for larger values of capacitive loads, a small series resistor, RS, can be added between the op amp output and the capacitor, CL. For the setup depicted in Figure 7, the relationship between RS and CL was empirically derived and is shown in Figure 8. RS was chosen to produce less than 1 dB of peaking in the frequency response. Note also that after a sharp rise, RS quickly settles to about 25 W. 402⍀ Gain RF (⍀) RG (⍀) –3 dB Bandwidth (MHz) +1 +2 +5 +10 0 402 1k 909 402 249 100 300 160 45 20 +5V 0.1␮F 402⍀ AD8055 VIN = 0dBm 3 FET PROBE VOUT RS 6 CL 4 50⍀ 0.1␮F Driving Capacitive Loads When driving a capacitive load, most op amps will exhibit peaking in the frequency response just before the frequency rolls off. Figure 6 shows the responses for an AD8056 running at a gain of +2, with a 100 W load that is shunted by various values of capacitance. It can be seen that under these conditions the part is still stable with capacitive loads of up to 30 pF. 10␮F 7 2 10␮F –5V Figure 7. Setup for RS vs. CL 40 35 30 RS – ⍀ 25 20 15 10 5 0 0 10 20 30 40 CL – pF 50 60 270 Figure 8. RS vs. CL –10– REV. I AD8055/AD8056 OUTLINE DIMENSIONS 8-Lead Plastic Dual In-Line Package [PDIP] (N-8) 8-Lead Mini Small Outline Package [MSOP] (RM-8) Dimensions shown in inches and (millimeters) Dimensions shown in millimeters 0.375 (9.53) 0.365 (9.27) 0.355 (9.02) 8 3.00 BSC 5 4 1 8 0.295 (7.49) 0.285 (7.24) 0.275 (6.98) 0.325 (8.26) 0.310 (7.87) 0.300 (7.62) 0.100 (2.54) BSC 0.015 (0.38) MIN 0.180 (4.57) MAX 0.150 (3.81) 0.130 (3.30) 0.110 (2.79) 0.022 (0.56) 0.018 (0.46) 0.014 (0.36) 5 4.90 BSC 3.00 BSC 1 PIN 1 0.150 (3.81) 0.135 (3.43) 0.120 (3.05) 0.65 BSC 1.10 MAX 0.15 0.00 0.015 (0.38) 0.010 (0.25) 0.008 (0.20) SEATING PLANE 0.060 (1.52) 0.050 (1.27) 0.045 (1.14) 4 0.38 0.22 COPLANARITY 0.10 0.80 0.60 0.40 8ⴗ 0ⴗ 0.23 0.08 SEATING PLANE COMPLIANT TO JEDEC STANDARDS MO-187AA COMPLIANT TO JEDEC STANDARDS MO-095AA 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 5-Lead Small Outline Transistor Package [SOT-23] (RT-5) 8-Lead Standard Small Outline Package [SOIC] Narrow Body (R-8) Dimensions shown in millimeters Dimensions shown in millimeters and (inches) 2.90 BSC 5.00 (0.1968) 4.80 (0.1890) 5 8 4.00 (0.1574) 3.80 (0.1497) 1 5 4 4 2.80 BSC 1.60 BSC 6.20 (0.2440) 5.80 (0.2284) 1 2 3 PIN 1 1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0040) COPLANARITY SEATING 0.10 PLANE 1.75 (0.0688) 1.35 (0.0532) 0.51 (0.0201) 0.31 (0.0122) 0.95 BSC 0.50 (0.0196) ⴛ 45ⴗ 0.25 (0.0099) 1.30 1.15 0.90 8ⴗ 0.25 (0.0098) 0ⴗ 1.27 (0.0500) 0.40 (0.0157) 0.17 (0.0067) 1.45 MAX 0.15 MAX COMPLIANT TO JEDEC STANDARDS MS-012AA 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 REV. I 1.90 BSC 0.50 0.30 SEATING PLANE 0.22 0.08 10ⴗ 5ⴗ 0ⴗ COMPLIANT TO JEDEC STANDARDS MO-178AA –11– 0.60 0.45 0.30 AD8055/AD8056 Revision History Location Page 2/04—Data Sheet changed from REV. H to REV. I. Changes to ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 6/03—Data Sheet changed from REV. G to REV. H. Changes to ABSOLUTE MAXIMUM RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Updated ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Updated OUTLINE DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2/03—Data Sheet changed from REV. F to REV. G. Changes to PRODUCT DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Changes to SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Change to ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 OUTLINE DIMENSIONS updated . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 10/02—Data Sheet changed from REV. E to REV. F. Text changes to reflect extended temperature range for R-8, N-8 packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Changes to SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Changes to ABSOLUTE MAXIMUM RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Figure 2 replaced . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Changes to ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 OUTLINE DIMENSIONS updated . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 7/01—Data Sheet changed from REV. D to REV. E. TPC 24 replaced with new graph . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3/01—Data Sheet changed from REV. C to REV. D. Edit to curve in TPC 23 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2/01—Data Sheet changed from REV. B to REV. C. Edits to text at top of SPECIFICATIONS page (65 to ± 5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 –12– REV. I C01063–0–2/04(I) Changes to FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1