a FEATURES Factory Set Gain AD879A: Gain = +2. (Also +. &.) AD879B: Gain = +2.2 (Also + &.2) Gain of 2.2 Compensates for System Gain Loss Minimizes External Components Tight Control of Gain and Gain Matching (.%) Optimum Dual Pinout Simplifies PCB Layout Low Crosstalk of 7 db @ 5 MHz Excellent Video Specifications (R L = 5 ) Gain Flatness. db to 5 MHz.% Differential Gain Error.2 Differential Phase Error Low Power of 5 mw/amplifier (5 ma) High Speed and Fast Settling 26 MHz, 3 db Bandwidth 75 V/ s Slew Rate (2 V Step), 8 V/ s (4 V Step) 4 ns Settling Time to.% (2 V Step) Low Distortion of 65 dbc THD, f C = 5 MHz High Output Drive of Over 7 ma Drives Up to 8 Back-Terminated 75 Loads (4 Loads/ Side) While Maintaining Good Differential Gain/ Phase Performance (.%/.7 ) High ESD Tolerance (5 kv) Available in Small 8-Pin SOIC APPLICATIONS Differential A-to-D Driver Video Line Driver Differential Line Driver Professional Cameras Video Switchers Special Effects RF Receivers PRODUCT DESCRIPTION The AD879 is a dual, low power, high speed buffer designed to operate on ±5 V supplies. The AD879 s pinout offers excellent input and output isolation compared to the traditional dual amplifier pin configuration. With two ac ground pins separating both the inputs and outputs, the AD879 achieves very low crosstalk of less than 7 db at 5 MHz. Additionally, the AD879 contains gain setting resistors factory set at G = +2. (A grade) or Gain = +2.2 (B grade) allowing circuit configurations with minimal external components. The B grade gain of +2.2 compensates for gain loss through a system by providing a single-point trim. Using active laser trimming of these resistors, the AD879 guarantees tight control of gain and channel-channel gain matching. With its performance and configuration, the AD879 is well suited for driving differential 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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Dual 26 MHz Gain = +2. & +2.2 Buffer AD879 FUNCTIONAL BLOCK DIAGRAM 8-Pin Plastic SOIC +IN GND GND +IN2 2 3 AD879 4 5 8 7 6 OUT +V S V S OUT2 cables and transformers. Its low distortion and fast settling are ideal for buffering high speed dual or differential A-to-D converters. The AD879 features a unique transimpedance linearization circuitry. This allows it to drive video loads with excellent differential gain and phase performance of.% and.2 on only 5 mw of power per amplifier. It features gain flatness of. db to 5 MHz. This makes the AD879 ideal for professional video electronics such as cameras and video switchers. The AD879 offers low power of 5 ma/amplifier (V S = ±5 V) and can run on a single +2 V power supply while delivering over 7 ma of load current. All of this is offered in a small 8-pin SOIC package. These features make this amplifier ideal for portable and battery powered applications where size and power are critical. The outstanding bandwidth of 26 MHz along with 8 V/µs of slew rate make the AD879 useful in many general purpose high speed applications where dual power supplies of ±3 V to ±6 V are required. The AD879 is available in the industrial temperature range of 4 C to +85 C. NORMALIZED FLATNESS db...2.3.4.5 M R L = Ω V IN = 5mV rms 5Ω 5Ω SIDE M M SIDE 2 SIDE SIDE 2 2 3 4 5 6 7 8 9 G Figure. Frequency Response and Flatness One Technology Way, P.O. Box 96, Norwood, MA 262-96, U.S.A. Tel: 67/329-47 World Wide Web Site: http://www.analog.com Fax: 67/326-873 Analog Devices, Inc., 996 NORMALIZED FREQUENCY RESPONSE db
AD879* PRODUCT PAGE QUICK LINKS Last Content Update: 9/22/27 COMPARABLE PARTS View a parametric search of comparable parts. DOCUMENTATION Application Notes AN-356: User's Guide to Applying and Measuring Operational Amplifier Specifications AN-42: Replacing Output Clamping Op Amps with Input Clamping Amps AN-47: Fast Rail-to-Rail Operational Amplifiers Ease Design Constraints in Low Voltage High Speed Systems AN-58: Biasing and Decoupling Op Amps in Single Supply Applications AN-649: Using the Analog Devices Active Filter Design Tool Data Sheet AD879: Dual 26 MHz Gain = +2. & +2.2 Buffer Data Sheet TOOLS AND SIMULATIONS Power Dissipation vs Die Temp VRMS/dBm/dBu/dBV calculators AD879 SPICE Macro Models REFERENCE MATERIALS Product Selection Guide High Speed Amplifiers Selection Table Tutorials MT-32: Ideal Voltage Feedback (VFB) Op Amp MT-33: Voltage Feedback Op Amp Gain and Bandwidth MT-47: Op Amp Noise MT-48: Op Amp Noise Relationships: /f Noise, RMS Noise, and Equivalent Noise Bandwidth MT-49: Op Amp Total Output Noise Calculations for Single-Pole System MT-5: Op Amp Total Output Noise Calculations for Second-Order System MT-52: Op Amp Noise Figure: Don't Be Misled MT-53: Op Amp Distortion: HD, THD, THD + N, IMD, SFDR, MTPR MT-56: High Speed Voltage Feedback Op Amps MT-58: Effects of Feedback Capacitance on VFB and CFB Op Amps MT-59: Compensating for the Effects of Input Capacitance on VFB and CFB Op Amps Used in Current-to- Voltage Converters MT-6: Choosing Between Voltage Feedback and Current Feedback Op Amps DESIGN RESOURCES AD879 Material Declaration PCN-PDN Information Quality And Reliability Symbols and Footprints DISCUSSIONS View all AD879 EngineerZone Discussions. SAMPLE AND BUY Visit the product page to see pricing options. TECHNICAL SUPPORT Submit a technical question or find your regional support number.
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AD879 SPECIFICATIONS (@ T A = +25 C, V S = 5 V, R L =, unless otherwise noted) AD879A/AD879B Parameter Conditions Min Typ Max Units DYNAMIC PERFORMANCE 3 db Small Signal Bandwidth V IN = 5 mv rms 26 MHz Bandwidth for. db Flatness V IN = 5 mv rms 5 MHz Large Signal Bandwidth V IN = V rms MHz Slew Rate V O = 2 V Step 75 V/µs V O = 4 V Step 8 V/µs Settling Time to.% V O = 2 V Step 4 ns Rise & Fall Time V O = 2 V Step 2.5 ns NOISE/HARMONIC PERFORMANCE Total Harmonic Distortion f C = 5 MHz, V O = 2 V p-p 65 dbc Crosstalk, Output to Output f = 5 MHz 7 db Input Voltage Noise f = khz 2. nv/ Hz Input Current Noise f = khz, +In 2. pa/ Hz Differential Gain Error NTSC, R L = 5 Ω. % NTSC, R L = 75 Ω. % Differential Phase Error NTSC, R L = 5 Ω.2 Degree R L = 75 Ω.7 Degree DC PERFORMANCE Offset Voltage, RTO 5 mv T MIN T MAX 2 mv Offset Drift, RTO 2 µv/ C +Input Bias Current 3. 6. ±µa T MIN T MAX ±µa Gain No Load.998/2.98 2./2.2 2.2/2.22 V/V R L = 5 Ω.995/2.95 2./2.2 2.5/2.25 V/V Gain Matching Channel-to-Channel, No Load. % Channel-to-Channel, R L = 5 Ω.5 % INPUT CHARACTERISTICS +Input Resistance +Input MΩ +Input Capacitance +Input.5 pf OUTPUT CHARACTERISTICS Output Voltage Swing R L = 5 Ω 2.7 3. ±V R L = 75 Ω 2.8 ±V Output Current 7 ma Short Circuit Current 85 ma POWER SUPPLY Operating Range ±3. ±6. V Quiescent Current/Both Amplifiers T MIN T MAX..5 ma Power Supply Rejection Ratio, RTO +V S = +4 V to +6 V, V S = 5 V 49 69 db V S = 4 V to 6 V, +V S = +5 V 4 5 db +Input Current T MIN T MAX..5 µa/v NOTES Output current is limited by the maximum power dissipation in the package. See the power derating curves. Specifications subject to change without notice. 2
AD879 ABSOLUTE MAXIMUM RATINGS Supply Voltage................................ 2.6 V Internal Power Dissipation 2 Small Outline Package (R)...................9 Watts Input Voltage................................... ±V S Output Short Circuit Duration.................... Observe Power Derating Curves Storage Temperature Range............. 65 C to +25 C Operating Temperature Range (A Grade)... 4 C to +85 C Lead Temperature Range (Soldering sec)........ +3 C NOTES Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only and 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. 2 Specification is for device in free air: 8-Pin SOIC Package: θ JA = 6 C/Watt MAXIMUM POWER DISSIPATION The maximum power that can be safely dissipated by the AD879 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 +5 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 +75 C for an extended period can result in device failure. While the AD879 is internally short circuit protected, this may not be sufficient to guarantee that the maximum junction temperature (+5 C) is not exceeded under all conditions. To ensure proper operation, it is necessary to observe the maximum power derating curves. 2. T J = +5 C MAXIMUM POWER DISSIPATION Watts.5..5 8-PIN SOIC PACKAGE 9 5 4 3 2 2 3 4 5 6 7 8 9 AMBIENT TEMPERATURE C Figure 2. Plot of Maximum Power Dissipation vs. Temperature ORDERING GUIDE Temperature Package Package Model Gain Range Description Option AD879AR G = +2. 4 C to +85 C 8-Pin Plastic SOIC SO-8 AD879AR-REEL G = +2. 4 C to +85 C REEL SOIC SO-8 AD879AR-REEL7 G = +2. 4 C to +85 C REEL 7 SOIC SO-8 AD879BR G = +2.2 4 C to +85 C 8-Pin Plastic SOIC SO-8 AD879BR-REEL G = +2.2 4 C to +85 C REEL SOIC SO-8 AD879BR-REEL7 G = +2.2 4 C to +85 C REEL 7 SOIC SO-8 CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD879 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. WARNING! ESD SENSITIVE DEVICE 3
AD879 V IN PULSE GENERATOR T R /T F = 25ps +5V µf.µf 7 2 AD879 8.µF 6 5Ω µf 5V R L = Ω NORMALIZED FLATNESS db R L = Ω V IN = 5mV rms...2.3 5Ω.4.5 M SIDE 2 SIDE SIDE 2 5Ω SIDE M M 2 3 4 5 6 7 8 9 G NORMALIZED FREQUENCY RESPONSE db Figure 3. Test Circuit Figure 6. Frequency Response and Flatness SIDE mv STEP 5 6 R L = Ω DISTORTION dbc 7 8 9 2ND HARMONIC 3RD HARMONIC SIDE 2 2mV 5ns k k M M M Figure 4. mv Step Response Figure 7. Distortion vs. Frequency, R L = Ω SIDE V STEP 6 7 R L = kω V OUT = 2Vp-p DISTORTION dbc 8 9 2ND HARMONIC 3RD HARMONIC SIDE 2 2mV 5ns 2 k k M M M Figure 5. V Step Response Figure 8. Distortion vs. Frequency, R L = kω 4
AD879 CROSSTALK db V IN = 2V p-p 2 R L = Ω 3 V S = ±5V 4 5 6 7 8 9 k.m M M M 2M INPUT LEVEL dbv 3 3 6 9 2 5 8 2 24 27 M V IN =.V rms V IN =.5V rms V IN =.25V rms V IN = 25mV rms V IN = 62.5mV rms M M 3 V S = ±5V R L = Ω 3 6 9 2 5 8 2 24 27 5M NORMALIZED OUTPUT LEVEL dbv Figure 9. Crosstalk (Output-to-Output) vs. Frequency Figure 2. Large Signal Frequency Response DIFF PHASE Degrees DIFF GAIN %.2....2.8.6.4.2. NTSC NTSC 2 2 BACK TERMINATED LOADS () 2 BACK TERMINATED LOADS () BACK TERMINATED LOAD (5Ω) 2 3 4 5 6 7 8 9 IRE BACK TERMINATED LOAD (5Ω) 3 4 5 6 7 8 9 IRE.%/DIV 5 4 3 2 2 3 4 2V STEP R C = Ω R L = 5Ω 5 2 4 6 8 2 TIME ns 9 Figure. Differential Gain and Differential Phase (per Amplifier) Figure 3. Short-Term Settling Time SIDE R L = Ω 2V STEP R L = Ω ERROR, (.5%/DIV) SIDE 2 OUTPUT INPUT 5ns 4mV 2µs NOTES: SIDE : V IN = V; 8mV/div RTO SIDE 2: V STEP RTO; 4mV/div Figure. Pulse Crosstalk, Worst Case, V Step Figure 4. Long-Term Settling Time 5
AD879 3.4.5 OUTPUT SWING Volts 3.3 3.2 3. 3. 2.9 2.8 2.7 +V OUT V OUT R L = 5Ω V S = ±5V TOTAL SUPPLY CURRENT ma..5. 9.5 V S = ±5V 2.6 2.5 55 35 5 5 25 45 65 85 JUNCTION TEMPERATURE C 5 25 9. 55 35 5 5 25 45 65 85 JUNCTION TEMPERATURE C 5 25 Figure 5. Output Swing vs. Temperature Figure 8. Total Supply Current vs. Temperature 7 6 2 5 INPUT BIAS CURRENT µa 5 4 3 2 +IN 55 35 5 5 25 45 65 85 5 25 JUNCTION TEMPERATURE C SHORT CIRCUIT CURRENT ma 5 95 9 85 8 75 7 55 35 SINK I SC SOURCE I SC 5 5 25 45 65 85 5 JUNCTION TEMPERATURE C 25 Figure 6. Input Bias Current vs. Temperature Figure 9. Short Circuit Current vs. Temperature INPUT OFFSET VOLTAGE RTO mv 8 DEVICE # 6 4 2 DEVICE #2 2 DEVICE #3 4 6 55 35 5 5 25 45 65 85 5 JUNCTION TEMPERATURE C 25 NOISE VOLTAGE, RTI nv/ Hz NONINVERTING CURRENT V S = ±5V VOLTAGE NOISE V S = ±5V k k k NOISE CURRENT pa/ Hz Figure 7. Input Offset Voltage vs. Temperature Figure 2. Noise vs. Frequency 6
PSRR db RESISTANCE Ω V S = ±5.V POWER = dbm (223.6mV rms).. k R bt = 5Ω R bt = Ω k M M M Figure 2. Output Resistance vs. Frequency 44. 46.5 49. 5.5 54. 56.5 59. 6.5 64. 66.5 69. 55 PSRR db 4 4 24 34 44 54 64 74 84 3k 35 PSRR 2V SPAN CURVES ARE FOR WORST CASE CONDITION WHERE ONE SUPPLY IS VARIED WHILE THE OTHER IS HELD CONSTANT. +PSRR 5 5 25 45 65 85 JUNCTION TEMPERATURE C Figure 22. PSRR vs. Temperature V IN = 2mV PSRR +PSRR k M M M 5 G 25 5M AD879 THEORY OF OPERATION The AD879, a dual current feedback amplifier, is internally configured for a gain of either +2 (AD879A) or +2.2 (AD879B). The internal gain-setting resistors effectively eliminate any parasitic capacitance associated with the inverting input pin, accounting for the AD879 s excellent gain flatness response. The carefully chosen pinout greatly reduces the crosstalk between each amplifier. Up to four back-terminated 75 Ω video loads can be driven by each amplifier, with a typical differential gain and phase performance of.%/.7, respectively. The AD879B, with a gain of +2.2, can be employed as a single gain-trimming element in a video signal chain. Finally, the AD879A/B used in conjunction with our AD86 crosspoint matrix, provides a complete turn-key solution to video distribution. Printed Circuit Board Layout Considerations As to be expected for a wideband amplifier, PC board parasitics can affect the overall closed-loop performance. If a ground plane is to be used on the same side of the board as the signal traces, a space (5 mm min) should be left around the signal lines to minimize coupling. Line lengths on the order of less than 5 mm are recommended. If long runs of coaxial cable are being driven, dispersion and loss must be considered. Power Supply Bypassing Adequate power supply bypassing can be critical when optimizing the performance of a high frequency circuit. Inductance in the power supply leads can form resonant circuits that produce peaking in the amplifier s response. In addition, if large current transients must be delivered to the load, then bypass capacitors (typically greater than µf) will be required to provide the best settling time and lowest distortion. A parallel combination of 4.7 µf and. µf is recommended. Some brands of electrolytic capacitors will require a small series damping resistor 4.7 Ω for optimum results. DC Errors and Noise There are three major noise and offset terms to consider in a current feedback amplifier. For offset errors refer to the equation below. For noise error the terms are root-sum-squared to give a net output error. In the circuit below (Figure 24) they are input offset (V IO ) which appears at the output multiplied by the noise gain of the circuit ( + R F /R I ), noninverting input current (I BN R N ) also multiplied by the noise gain, and the inverting input current, which when divided between R F and R I and subsequently multiplied by the noise gain always appears at the output as I BN R F. The input voltage noise of the AD879 is a low 2 nv/ Hz. At low gains though the inverting input current noise times R F is the dominant noise source. Careful layout and device matching contribute to better offset and drift specifications for the AD879 compared to many other current feedback amplifiers. The typical performance curves in conjunction with the equations below can be used to predict the performance of the AD879 in any application. 9 Figure 23. PSRR vs. Frequency V OUT =V IO + R F ± I BN R N + R F ± I BI R F R I R I where: R F = R I = 75 Ω for AD879A R F = 75 Ω, R I = 625 Ω for AD879B 7
AD879 R I (INTERNAL) I BI R F (INTERNAL) +V S 4.7µF CABLE V OUT # R N I BN R SERIES Figure 24. Output Offset Voltage V OUT Driving Capacitive Loads The AD879 was designed primarily to drive nonreactive loads. If driving loads with a capacitive component is desired, best frequency response is obtained by the addition of a small series output resistance (R SERIES ). The graph in Figure 25 shows the optimum value for R SERIES vs. capacitive load. It is worth noting that the frequency response of the circuit when driving large capacitive loads will be dominated by the passive roll-off of R SERIES and C L. 4 C L V IN CABLE 2 4 3 7 /2 AD879 6 V S /2 AD879.µF 8.µF 4.7µF 5 CABLE CABLE CABLE V OUT #2 V OUT #3 V OUT #4 R SERIES Ω 3 2 5 5 2 25 C L pf Figure 25. Recommended R SERIES vs. Capacitive Load Operation as a Video Line Driver The AD879 has been designed to offer outstanding performance as a video line driver. The important specifications of differential gain (.%) and differential phase (.2 ) meet the most exacting HDTV demands for driving one video load with each amplifier. The AD879 also drives four back terminated loads (two each), as shown in Figure 26, with equally impressive performance (.%,.7 ). Another important consideration is isolation between loads in a multiple load application. The AD879 has more than 4 db of isolation at 5 MHz when driving two 75 Ω back terminated loads. Figure 26. Video Line Driver Single-Ended to Differential Driver Using an AD879 The two halves of an AD879 can be configured to create a single-ended to differential high speed driver with a 3 db bandwidth in excess of MHz as shown in Figure 27. Although the individual op amps are each current feedback with internal feedback resistors, the overall architecture yields a circuit with attributes normally associated with voltage feedback amplifiers, while offering the speed advantages inherent in current feedback amplifiers. In addition, the gain of the circuit can be changed by varying a single resistor, R F, which is often not possible in a dual op amp differential driver. V IN R G 75Ω /2 AD879 /2 AD879 C C =.5pF R F 75Ω OP AMP # OP AMP #2 5Ω 5Ω OUTPUT # OUTPUT #2 Figure 27. Differential Line Driver 8
The current feedback nature of the op amps, in addition to enabling the wide bandwidth, provides an output drive of more than 3 V p-p into a 2 Ω load for each output at 2 MHz. On the other hand, the voltage feedback nature provides symmetrical high impedance inputs and allows the use of reactive components in the feedback network. The circuit consists of the two op amps each configured as a unity gain follower by the 75 Ω feedback resistors between each op amp s output and inverting input. The output of each op amp has a 75 Ω resistor to the inverting input of the other op amp. Thus, each output drives the other op amp through a unity gain inverter configuration. By connecting the two amplifiers as cross-coupled inverters, their outputs are free to be equal and opposite, assuring zero-output common-mode voltage. With this circuit configuration, the common-mode signal of the outputs is reduced. If one output moves slightly higher, the negative input to the other op amp drives its output to go slightly lower and thus preserves the symmetry of the complementary outputs which reduces the common-mode signal. The resulting architecture offers several advantages. First, the gain can be changed by changing a single resistor. Changing either R F or R G will change the gain as in an inverting op amp circuit. For most types of differential circuits, more than one resistor must be changed to change gain and still maintain good CMR. Reactive elements can be used in the feedback network. This is in contrast to current feedback amplifiers that restrict the use of reactive elements in the feedback. The circuit described requires about.3 pf of capacitance in shunt across R F in order to optimize peaking and realize a 3 db bandwidth of more than MHz. The peaking exhibited by the circuit is very sensitive to the value of this capacitor. Parasitics in the board layout on the order of tenths of picofarads will influence the frequency response and the value required for the feedback capacitor, so a good layout is essential. The shunt capacitor type selection is also critical. Good microwave type chip capacitors with high Q were found to yield best performance. OUTPUT db 6 4 2 2 4 6 8 2 C C =.3pF V IN = dbm OUT+ OUT AD879 4.M M M M G Figure 28. Differential Driver Frequency Response Layout Considerations The specified high speed performance of the AD879 requires careful attention to board layout and component selection. Proper RF design techniques and low parasitic component selection are mandatory. The PCB should have a ground plane covering all unused portions of the component side of the board to provide a low impedance ground path. The ground plane should be removed from the area near the input pins to reduce stray capacitance. Chip capacitors should be used for supply bypassing (see Figure 29). One end should be connected to the ground plane and the other within /8 in. of each power pin. An additional large (4.7 µf µf) tantalum electrolytic capacitor should be connected in parallel, but not necessarily so close, to supply current for fast, large-signal changes at the output. Stripline design techniques should be used for long signal traces (greater than about in.). These should be designed with a characteristic impedance of 5 Ω or 75 Ω and be properly terminated at each end. 9 9
AD879 +V S IN R T 5Ω OUT V S Inverting Configuration +V S C.µF C3 µf V S C2.µF C4 µf Supply Bypassing +V S Figure 3. Board Layout (Silkscreen) IN 5Ω OUT R T V S *SEE TABLE I Noninverting Configuration (G = +2) TRIM IN 2Ω AD879B OUT R T Optional Gain Trim (G = +2 +2.2) Figure 3. Board Layout (Component Layer) TIE INPUT PINS TOGETHER TO MINIMIZE PEAKING IN +V S OUT R T V S Noninverting Configuration (G = +) Figure 29. Inverting and Noninverting Configurations Table I. Recommended Component Values Component + +2/+2.2 R T (Nominal) (Ω) 53.6 49.9 49.9 Small Signal BW (MHz) 22 75 26. db Flatness (MHz) 5 5 Figure 32. Board Layout (Solder Side; Looking Through the Board)
AD879 OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 8-Lead SOIC (SO-8).968 (5.).89 (4.8).574 (4.).497 (3.8) 8 5 4.244 (6.2).2284 (5.8) PIN.98 (.25).4 (.).688 (.75).532 (.35).96 (.5).99 (.25) x 45 SEATING PLANE.5 (.27) BSC.92 (.49).38 (.35).98 (.25).75 (.9) 8.5 (.27).6 (.4) 9
PRINTED IN U.S.A. C285a xx /96 2
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