LMH6714,LMH6720,LMH6722 LMH6714/ LMH6720/ LMH6722/ LMH6722Q Wideband Video Op Amp; Single, Single with Shutdown and Quad Literature Number: SNOSA39F October 20, 2009 Wideband Video Op Amp; Single, Single with Shutdown and Quad General Description Features The LMH6714/LMH6720/LMH6722 series combine National's VIP10TM high speed complementary bipolar process with National's current feedback topology to produce a very high speed op amp. These amplifiers provide a 400MHz small signal bandwidth at a gain of +2V/V and a 1800V/s slew rate while consuming only 5.6mA from 5V supplies. The LMH6714/LMH6720/LMH6722 series offer exceptional video performance with its 0.01% and 0.01 differential gain and phase errors for NTSC and PAL video signals while driving a back terminated 75 load. They also offer a flat gain response of 0.1dB to 120MHz. Additionally, they can deliver 70mA continuous output current. This level of performance makes them an ideal op amp for broadcast quality video systems. The LMH6714/LMH6720/LMH6722's small packages (SOIC, SOT23 and LLP), low power requirement, low noise and distortion allow the LMH6714/LMH6720/LMH6722 to serve portable RF applications. The high impedance state during shutdown makes the LMH6720 suitable for use in multiplexing multiple high speed signals onto a shared transmission line. The LMH6720 is also ideal for portable applications where current draw can be reduced with the shutdown function. 400MHz (AV = +2V/V, VOUT = 500mVPP) -3dB BW 250MHz (AV = +2V/V, VOUT = 2VPP) -3dB BW 0.1dB gain flatness to 120MHz Low power: 5.6mA TTL compatible shutdown pin (LMH6720) Very low diff. gain, phase: 0.01%, 0.01 (LMH6714) -58 HD2/ -70 HD3 at 20MHz Fast slew rate: 1800V/s Low shutdown current: 500uA (LMH6720) 11ns turn on time (LMH6720) 7ns shutdown time (LMH6720) Unity gain stable Improved replacement for CLC400,401,402,404,406 and 446 (LMH6714) Improved replacement for CLC405 (LMH6720) Improved replacement for CLC415 (LMH6722) LMH6722QSD is AEC-Q100 grade 1 qualified and is manufactured on an automotive grade flow Applications HDTV, NTSC & PAL video systems Video switching and distribution Wideband active filters Cable drivers High speed multiplexer (LMH6720) Programmable gain amplifier (LMH6720) Automotive (LMH6722) Differential Gain and Phase vs. Number of Video Loads (LMH6714) Typical Performance Non-Inverting Small Signal Frequency Response 20056528 20056506 VIP10TM is a trademark of National Semiconductor Corporation. (c) 2009 National Semiconductor Corporation 200565 www.national.com LMH6714/ LMH6720/ LMH6722/ LMH6722Q Wideband Video Op Amp; Single, Single with Shutdown and Quad LMH6714/ LMH6720/ LMH6722/ LMH6722Q LMH6714/ LMH6720/ LMH6722/ LMH6722Q Storage Temperature Range Shutdown Pin Voltage (Note 5) Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. ESD Tolerance (Note 4) Human Body Model Machine Model VCC IOUT Common Mode Input Voltage Differential Input Voltage Maximum Junction Temperature Storage Temperature Range Lead Temperature (soldering 10 sec) Operating Ratings Thermal Resistance Package 2000V 200V 6.75V (Note 3) VCC 2.2V +150C -65C to +150C +300C 5-Pin SOT23 6-Pin SOT23 8-Pin SOIC 14-Pin SOIC 14-Pin TSSOP 14-Pin LLP Operating Temperature Operating Temperature LLP Supply Voltage Range -65C to +150C +VCC to VCC/2-1V (Note 1) (JA) 232C/W 198C/W 145C/W 130C/W 160C/W 46C/W -40C to 85C -40C to 125C 8V (4V) to 12.5V (6.25V) Electrical Characteristics Unless specified, AV = +2, RF = 300: VCC = 5V, RL = 100, LMH6714/LMH6720/LMH6722. Boldface limits apply at temperature extremes. Symbol Parameter Conditions Min (Note 7) Typ (Note 6) Max (Note 7) Units Frequency Domain Response SSBW -3dB Bandwidth VOUT = 0.5VPP 345 400 MHz LSBW -3dB Bandwidth VOUT = 2.0VPP 200 250 MHz LSBW -3dB Bandwidth, LMH6722 TSSOP package only VOUT = 2.0VPP 170 250 MHz Gain Flatness VOUT = 2VPP dB GFP Peaking DC to 120MHz 0.1 GFR Rolloff DC to 120MHz 0.1 dB LPD Linear Phase Deviation DC to 120MHz 0.5 deg DG Differential Gain RL = 150, 4.43MHz (LMH6714) 0.01 % DG Differential Gain RL = 150, 4.43MHz (LMH6720) 0.02 % DP Differential Phase RL = 150, 4.43MHz 0.01 deg .5V Step 1.5 ns ns Time Domain Response TRS Rise and Fall Time TRL 2V Step 2.6 ts Settling Time to 0.05% 2V Step 12 ns SR Slew Rate 6V Step 1800 V/s 1200 Distortion and Noise Response HD2 2nd Harmonic Distortion 2VPP, 20MHz -58 dBc HD3 3rd Harmonic Distortion 2VPP, 20MHz -70 dBc IMD 3rd Order Intermodulation Products 10MHz, POUT = 0dBm -78 dBc Equivalent Input Noise VN Non-Inverting Voltage >1MHz 3.4 nV/ NICN Inverting Current >1MHz 10 pA/ ICN Non-Inverting Current >1MHz 1.2 pA/ Static, DC Performance VIO DVIO Input Offset Voltage 0.2 Average Drift www.national.com 8 2 6 8 mV V/C IBN DIBN IBI Parameter Input Bias Current Min (Note 7) Typ (Note 6) Max (Note 7) Units Non-Inverting 1 10 15 A Inverting -4 Average Drift Input Bias Current DIBI Conditions 4 A 41 nA/C PSRR Power Supply Rejection Ratio DC 48 47 58 dB CMRR Common Mode Rejection Ratio DC 48 45 54 dB ICC Supply Current RL = LMH6714 LMH6720 4.5 3 5.6 7.5 8 LMH6722 18 15 22.5 30 32 500 670 ICCI Average Drift nA/C 12 20 Supply Current During Shutdown LMH6720 mA A Miscellaneous Performance RIN Input Resistance Non-Inverting 2 M CIN Input Capacitance Non-Inverting 1.0 pF ROUT Output Resistance Closed Loop 0.06 VOUT Output Voltage Range RL = 3.5 3.4 3.9 RL = 100 3.6 3.4 3.8 V CMIR Input Voltage Range Common Mode IOUT Output Current (Note 3) VIN = 0V, Max Linear Current OFFMA X Voltage for Shutdown LMH6720 ONMIN Voltage for Turn On LMH6720 2.0 IIH Current Turn On LMH6720, SD = 2.0V -20 -30 2 20 30 A IIL Current Shutdown LMH6720, SD = .8V -600 -400 -100 A IOZ ROUT Shutdown LMH6720, SD = .8V 0.2 1.8 M ton Turn on Time LMH6720 11 ns toff Turn off Time LMH6720 7 ns 50 2.2 V 70 mA 0.8 V V Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but specific performance is not guaranteed. For guaranteed specifications, see the Electrical Characteristics tables. Note 2: Electrical Table values apply only for factory testing conditions at the temperature indicated. Factory testing conditions result in very limited self-heating of the device such that TJ = TA. No guarantee of parametric performance is indicated in the electrical tables under conditions of internal self heating where TJ > TA. See Applications Section for information on temperature derating of this device." Min/Max ratings are based on product characterization and simulation. Individual parameters are tested as noted. Note 3: The maximum output current (IOUT) is determined by device power dissipation limitations. See the Power Dissipation section of the Application Division for more details. Note 4: Human Body Model, applicable std. MIL-STD-883, Method 3015.7. Machine Model, applicable std. JESD22-A115-A (ESD MM std. of JEDEC) Field-Induced Charge-Device Model, applicable std. JESD22-C101-C (ESD FICDM std. of JEDEC). Note 5: The shutdown pin is designed to work between 0 and VCC with split supplies (VCC = -VEE). With single supplies (VEE = ground) the shutdown pin should not be taken below VCC/2. Note 6: Typical values represent the most likely parametric norm at the time of characterization. Actual typical values may vary over time and will also depend on the application and configuration. The typical values are not tested and are not guaranteed on shipped production material. Note 7: All limits are guaranteed by testing, design, or statistical analysis. 3 www.national.com LMH6714/ LMH6720/ LMH6722/ LMH6722Q Symbol LMH6714/ LMH6720/ LMH6722/ LMH6722Q Connection Diagrams 5-Pin SOT23 (LMH6714) 6-Pin SOT23 (LMH6720) 20056531 14-Pin SOIC, TSSOP and LLP (LMH6722) 20056532 Top View Top View 20056534 Top View 8-Pin SOIC (LMH6720) 8-Pin SOIC (LMH6714) 20056538 20056539 Top View Top View Ordering Information Package 5-Pin SOT23 8-Pin SOIC 6-Pin SOT23 8-Pin SOIC 14-Pin SOIC 14-Pin TSSOP Part Number LMH6714MF LMH6714MFX LMH6714MA LMH6714MAX LMH6720MF LMH6720MFX LMH6720MA LMH6720MAX LMH6722MA LMH6722MAX LMH6722MT LMH6722MTX LMH6722SD 14-Pin LLP LMH6722SDX LMH6722QSD LMH6722QSDX Package Marking A95A LMH6714MA A96A LMH6720MA LMH6722MA LMH6722MT L6722 L6722Q Transport Media 1k Units Tape and Reel 3k Units Tape and Reel 95 Units / Rail 2.5k Units Tape and Reel 1k Units Tape and Reel 3k Units Tape and Reel 95 Units / Rail 2.5k Units Tape and Reel 55 Units / Rail 2.5k Units Tape and Reel 94 Units / Rail 2.5k Units Tape and Reel NSC Drawing MF05A M08A MF06A M08A M14A MTC14 1k Units Tape and Reel 4.5k Units Tape and Reel 1k Units Tape and Reel 4.5k Units Tape and Reel Features SDA14A AEC-Q100 Grade 1 qualified. Automotive Grade Production Flow** **Automotive Grade (Q) product incorporates enhanced manufacturing and support processes for the automotive market, including defect detection methodologies. Reliability qualification is compliant with the requirements and temperature grades defined in the AEC-Q100 standard. Automotive grade products are identified with the letter Q. For more information go to http://www.national.com/automotive. www.national.com 4 (V+ = +5V, V- = -5V, AV = 2, RF = 300, RL = 100 Unless Specified). Non-Inverting Small Signal Frequency Response Non-Inverting Large Signal Frequency Response 20056506 20056507 Inverting Frequency Response Non-Inverting Frequency Response vs. VO 20056503 20056508 Inverting Frequency Response vs. VO Harmonic Distortion vs. Frequency 20056509 20056504 5 www.national.com LMH6714/ LMH6720/ LMH6722/ LMH6722Q Typical Performance Characteristics LMH6714/ LMH6720/ LMH6722/ LMH6722Q 2nd Harmonic Distortion vs. VOUT 3rd Harmonic Distortion vs. VOUT 20056502 20056501 DG/DP (LMH6714) DG/DP (LMH6720) 20056528 20056505 DG/DP (LMH6722) Large Signal Pulse Response 20056513 20056535 www.national.com 6 Closed Loop Output Resistance 20056511 20056510 Open Loop Transimpedance Z(s) PSRR vs. Frequency 20056523 20056516 CMRR vs. Frequency Frequency Response vs. RF 20056512 20056525 7 www.national.com LMH6714/ LMH6720/ LMH6722/ LMH6722Q Small Signal Pulse Response LMH6714/ LMH6720/ LMH6722/ LMH6722Q DC Errors vs. Temperature Maximum VOUT vs. Frequency 20056518 20056526 3rd Order Intermodulation vs. Output Power Crosstalk vs. Frequency (LMH6722) for each channel with all others active 20056527 20056536 Noise vs. Frequency 20056540 www.national.com 8 FEEDBACK RESISTOR SELECTION One of the key benefits of a current feedback operational amplifier is the ability to maintain optimum frequency response independent of gain by using appropriate values for the feedback resistor (RF). The Electrical Characteristics and Typical Performance plots specify an RF of 300, a gain of +2V/V and 5V power supplies (unless otherwise specified). Generally, lowering RF from it's recommended value will peak the frequency response and extend the bandwidth while increasing the value of RF will cause the frequency response to roll off faster. Reducing the value of RF too far below it's recommended value will cause overshoot, ringing and, eventually, oscillation. 20056515 FIGURE 2. RF vs. Non-Inverting Gain In the "RF vs. Non-Inverting Gain" and the "RF vs. Inverting Gain" charts the recommended value of RF is depicted by the solid line, which starts high, decreases to 200 and begins increasing again. The reason that a higher RF is required at higher gains is the need to keep RG from decreasing too far below the output impedance of the input buffer. For the LMH6714/LMH6720/LMH6722 the output resistance of the input buffer is approximately 180 and 50 is a practical lower limit for RG. Due to the limitations on RG the LMH6714/ LMH6720/LMH6722 begins to operate in a gain bandwidth limited fashion for gains of 5V/V or greater. 20056512 FIGURE 1. Frequency Response vs. RF The plot labeled "Frequency Response vs. RF" shows the LMH6714/LMH6720/LMH6722's frequency response as RF is varied (RL = 100, AV = +2). This plot shows that an RF of 147 results in peaking. An RF of 300 gives near maximal bandwidth and gain flatness with good stability. An RF of 400 gives excellent stability with only a small bandwidth penalty. Since all applications are slightly different it is worth some experimentation to find the optimal RF for a given circuit. Note that it is not possible to use a current feedback amplifier with the output shorted directly to the inverting input. The buffer configuration of the LMH6714/LMH6720/LMH6722 requires a 600 feedback resistor for stable operation. For more information see Application Note OA-13 which describes the relationship between RF and closed-loop frequency response for current feedback operational amplifiers. The value for the inverting input impedance for the LMH6714/ LMH6720/LMH6722 is approximately 180. The LMH6714/ LMH6720/LMH6722 is designed for optimum performance at gains of +1 to +6 V/V and -1 to -5V/V. When using gains of 7V/V or more the low values of RG required will make inverting input impedances very low. When configuring the LMH6714/LMH6720/LMH6722 for gains other than +2V/V, it is usually necessary to adjust the value of the feedback resistor. The two plots labeled "RF vs. Non-inverting Gain" and "RF vs. Inverting Gain" provide recommended feedback resistor values for a number of gain selections. 20056514 FIGURE 3. RF vs. Inverting Gain ACTIVE FILTERS When using any current feedback Operational Amplifier as an active filter it is important to be very careful when using reactive components in the feedback loop. Anything that reduces the impedance of the negative feedback, especially at higher frequencies, will almost certainly cause stability problems. Likewise capacitance on the inverting input needs to be avoided. See Application Notes OA-7 and OA-26 for more information on Active Filter applications for Current Feedback Op Amps. 9 www.national.com LMH6714/ LMH6720/ LMH6722/ LMH6722Q Application Section LMH6714/ LMH6720/ LMH6722/ LMH6722Q 20056521 FIGURE 4. Enable/Disable Operation 20056524 ENABLE/DISABLE OPERATION USING 5V SUPPLIES (LMH6720 ONLY) The LMH6720 has a TTL logic compatible disable function. Apply a logic low (<.8V) to the DS pin and the LMH6720 is disabled. Apply a logic high (>2.0V), or let the pin float and the LMH6720 is enabled. Voltage, not current, at the Disable pin determines the enable/disable state. Care must be exercised to prevent the disable pin voltage from going more than . 8V below the midpoint of the supply voltages (0V with split supplies, VCC/2 with single supplies) doing so could cause transistor Q1 to Zener resulting in damage to the disable circuit. The core amplifier is unaffected by this, but disable operation could become slower as a result. Disabled, the LMH6720 inputs and output become high impedances. While disabled the LMH6720 quiescent current is approximately 500A. Because of the pull up resistor on the disable circuit the ICC and IEE currents are not balanced in the disabled state. The positive supply current (ICC) is approximately 500A while the negative supply current (IEE) is only 200A. The remaining IEE current of 300A flows through the disable pin. The disable function can be used to create analog switches or multiplexers. Implement a single analog switch with one LMH6720 positioned between an input and output. Create an analog multiplexer with several LMH6720's. The LMH6720 is at it's best at a gain of 1 for multiplexer applications because there is no RG to shunt signals to ground. FIGURE 5. Typical Application with Suggested Supply Bypassing LAYOUT CONSIDERATIONS Whenever questions about layout arise, use the evaluation board as a guide. The following Evaluation boards are available with sample parts: LMH6714 LMH6720 LMH6722 CLC730216 CLC730227 CLC730216 CLC730227 CLC730231 To reduce parasitic capacitances, the ground plane should be removed near the input and output pins. To reduce series inductance, trace lengths of components in the feedback loop should be minimized. For long signal paths controlled impedance lines should be used, along with impedance matching at both ends. Bypass capacitors should be placed as close to the device as possible. Bypass capacitors from each rail to ground are applied in pairs. The larger electrolytic bypass capacitors can be located anywhere on the board, the smaller ceramic capacitors should be placed as close to the device as possible. In addition Figure 2 shows a capacitor (C1) across the supplies with no connection to ground. This capacitor is optional, however it is required for best 2nd Harmonic suppression. If this capacitor is omitted C2 and C3 should be increased to .1F each. DISABLE LIMITATIONS (LMH6720 ONLY) The feedback Resistor (RF) limits off isolation in inverting gain configurations. During shutdown the impedance of the LMH6720 inputs and output become very high (>1M), however RF and RG are the dominant factor for effective output impedance. Do not apply voltages greater than +VCC or less than 0V (VCC/2 single supply) to the disable pin. The input ESD diodes will also conduct if the signal leakage through the feedback resistors brings the inverting input near either supply rail. www.national.com SOT SOIC SOT SOIC SOIC VIDEO PERFORMANCE The LMH6714/LMH6720/LMH6722 has been designed to provide excellent performance with both PAL and NTSC composite video signals. Performance degrades as the loading is increased, therefore best performance will be obtained with back terminated loads. The back termination reduces reflections from the transmission line and effectively masks capacitance from the amplifier output stage. While all parts offer excellent video performance the LMH6714 and LMH6722 are slightly better than the LMH6720. 10 LMH6714/ LMH6720/ LMH6722/ LMH6722Q WIDE BAND DIGITAL PROGRAMMABLE GAIN AMPLIFIER (LMH6720 ONLY) 20056519 FIGURE 6. Wideband Digitally Controlled Programmable Gain Amplifier Channel Switching 20056520 FIGURE 7. PGA Output As shown in Figure 6 and Figure 7 the LMH6720 can be used to construct a digitally controlled programmable gain amplifier. Each amplifier is configured to provide a digitally selectable gain. To provide for accurate gain settings, 1% or AMPLITUDE EQUALIZATION Sending signals over coaxial cable greater than 50 meters in length will attenuate high frequency signal components much more than lower frequency components. An equalizer can be made to pre emphasize the higher frequency components so that the final signal has less distortion. This process can be done at either end of the cable. The circuit in Figure 8 shows a receiver with some additional components in the feedback loop to equalize the incoming signal. The RC networks peak the signal at higher frequencies. This peaking is a piecewise linear approximation of the inverse of the frequency response of the coaxial cable. Figure 9 shows the effect of this equalization on a digital signal that has passed through 150 meters of coaxial cable. Figure 10 shows a Bode plot of the frequency better tolerance is recommended on the feedback and gain resistors. The gain provided by each digital code is arbitrary through selection of the feedback and gain resistor values. response of the circuit in Figure 8 along with equations needed to design the pole and zero frequencies. Figure 11 shows a network analyzer plot of an LMH6714/LMH6720/LMH6722 with the following component values: RG = 309 R1 = 450 C1 = 470pF R2 = 91 C2 = 68pF 11 www.national.com LMH6714/ LMH6720/ LMH6722/ LMH6722Q 20056522 20056517 FIGURE 8. Equalizer Circuit Schematic FIGURE 11. Equalizer Frequency Response POWER DISSIPATION Follow these steps to determine the Maximum power dissipation for the LMH6714/LMH6720/LMH6722: 1. Calculate the quiescent (no load) power: PAMP = ICC (VCC -VEE) 2. Calculate the RMS power at the output stage: POUT (RMS) = ((VCC - VOUT (RMS)) * IOUT (RMS)), where VOUT and IOUT are the voltage and current across the external load. 3. Calculate the total RMS power: PT = PAMP + POUT The maximum power that the LMH6714/LMH6720/LMH6722, package can dissipate at a given temperature can be derived with the following equation: PMAX = (150 - TA)/ JA, where TA = Ambient temperature ( C) and JA = Thermal resistance, from junction to ambient, for a given package (C/W). For the SOIC package JA is 148C/ W, for the SOT it is 250C/W. 20056529 FIGURE 9. Digital Signal without and with Equalization 20056530 FIGURE 10. Design Equations www.national.com 12 LMH6714/ LMH6720/ LMH6722/ LMH6722Q Physical Dimensions inches (millimeters) unless otherwise noted 5-Pin SOT23 NS Product Number MF05A 6-Pin SOT23 NS Product Number MF06A 13 www.national.com LMH6714/ LMH6720/ LMH6722/ LMH6722Q 8-Pin SOIC NS Product Number M08A 14-Pin SOIC NS Product Number M14A www.national.com 14 LMH6714/ LMH6720/ LMH6722/ LMH6722Q 14-Pin TSSOP NS Product Number MTC14 14-Pin LLP NS Product Number SDA14A 15 www.national.com LMH6714/ LMH6720/ LMH6722/ LMH6722Q Wideband Video Op Amp; Single, Single with Shutdown and Quad Notes For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Design Support Amplifiers www.national.com/amplifiers WEBENCH(R) Tools www.national.com/webench Audio www.national.com/audio App Notes www.national.com/appnotes Clock and Timing www.national.com/timing Reference Designs www.national.com/refdesigns Data Converters www.national.com/adc Samples www.national.com/samples Interface www.national.com/interface Eval Boards www.national.com/evalboards LVDS www.national.com/lvds Packaging www.national.com/packaging Power Management www.national.com/power Green Compliance www.national.com/quality/green Switching Regulators www.national.com/switchers Distributors www.national.com/contacts LDOs www.national.com/ldo Quality and Reliability www.national.com/quality LED Lighting www.national.com/led Feedback/Support www.national.com/feedback Voltage Reference www.national.com/vref Design Made Easy www.national.com/easy www.national.com/powerwise Solutions www.national.com/solutions Mil/Aero www.national.com/milaero PowerWise(R) Solutions Serial Digital Interface (SDI) www.national.com/sdi Temperature Sensors www.national.com/tempsensors SolarMagicTM www.national.com/solarmagic Wireless (PLL/VCO) www.national.com/wireless www.national.com/training PowerWise(R) Design University THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION ("NATIONAL") PRODUCTS. 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