LMH6609 LMH6609 900MHz Voltage Feedback Op Amp Literature Number: SNOSA84E LMH6609 900MHz Voltage Feedback Op Amp General Description Features The LMH6609 is an ultra wideband, unity gain stable, low power, voltage feedback op amp that offers 900MHz bandwidth at a gain of 1, 1400V/s slew rate and 90mA of linear output current. The LMH6609 is designed with voltage feedback architecture for maximum flexibility especially for active filters and integrators. The LMH6609 has balanced, symmetrical inputs with well-matched bias currents and minimal offset voltage. With Differential Gain of 0.01% and Differential Phase of 0.026 the LMH6609 is suited for video applications. The 90mA of linear output current makes the LMH6609 suitable for multiple video loads and cable driving applications as well. The supply voltage is specified at 6.6V and 10V. A low supply current of 7mA (at 10V supply) makes the LMH6609 useful in a wide variety of platforms, including portable or remote equipment that must run from battery power. The LMH6609 is available in the industry standard 8-pin SOIC package and in the space-saving 5-pin SOT package. The LMH6609 is specified for operation over the -40C to +85C temperature range. The LMH6609 is manufactured in National Semiconductor's state-of-the-art VIP10TM technology for high performance. 900MHz -3dB bandwidth (AV = 1) Large signal bandwidth and slew rate 100% tested 280MHz -3dB bandwidth (AV = +2, VOUT = 2VPP) 90mA linear output current 1400V/s slew rate Unity gain stable <1mV input Offset voltage 7mA Supply current (no load) 6.6V to 12V supply voltage range 0.01%/0.026 differential gain/phase PAL voltage noise 3.1nV/ Improved replacement for CLC440, 420, 426 Applications Test equipment IF/RF amplifier A/D Input driver Active filter Integrator DAC output buffer Transimpedance amplifier Typical Application 20079037 20079038 Sallen Key Low Pass Filter with Equal C Values VIP10TM is a trademark of National Semiconductor Corporation. (c) 2011 National Semiconductor Corporation 200790 www.national.com LMH6609 900MHz Voltage Feedback Op Amp January 4, 2011 LMH6609 Absolute Maximum Ratings (Note 1) Operating Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. VS (V+ - V-) IOUT Common Mode Input Voltage Maximum Junction Temperature Storage Temperature Range Lead Temperature Range ESD Tolerance (Note 4) Human Body Model Machine Model Thermal Resistance Package 8-Pin SOIC 5-Pin SOT23 Operating Temperature Nominal Supply Voltage (Note 6) 6.6V (Note 3) V+ to V- +150C -65C to +150C +300C (Note 3) (JC) 65C/W 120C/W -40C 3.3V (JA) 145C/W 187C/W +85C 6V 2000V 200V 5V Electrical Characteristics Unless specified, AV = +2, RF = 250: VS = 5V, RL = 100; unless otherwise specified. Boldface limits apply over temperature Range. (Note 2) Symbol Parameter Conditions Min Typ Max Units Frequency Domain Response SSBW -3dB Bandwidth VOUT = 0.5VPP 260 MHz LSBW -3dB Bandwidth VOUT = 4.0VPP SSBWG1 -3dB Bandwidth AV = 1 VOUT = 0.25VPP 170 MHz 900 MHz GFP .1dB Bandwidth DG Differential Gain Gain is Flat to .1dB 130 MHz RL = 150, 4.43MHz 0.01 % DP Differential Phase RL = 150, 4.43MHz 0.026 deg 1V Step 1.6 ns 4V Step 2.6 ns 15 ns 1400 V/s 150 Time Domain Response TRS Rise and Fall Time TRL ts Settling Time to 0.05% 2V Step SR Slew Rate 4V Step (Note 5) 1200 Distortion and Noise Response HD2 2nd Harmonic Distortion 2VPP, 20MHz -63 dBc HD3 3rd 2VPP, 20MHz -57 dBc Harmonic Distortion Equivalent Input Noise VN Voltage Noise >1MHz 3.1 nV/ CN Current Noise >1MHz 1.6 pA/ Static, DC Performance VIO IBN Input Offset Voltage 0.8 Input Voltage Temperature Drift 4 Input Bias Current -2 2.5 3.5 mV V/C 5 8 A Bias Current Temperature Drift 11 IBI Input Offset Current .1 PSRR Power Supply Rejection Ratio DC, 1V Step 67 65 73 dB CMRR Common Mode Rejection Ratio DC, 2V Step 67 65 73 dB ICC Supply Current RL = www.national.com 7.0 2 nA/C 1.5 3 7.8 8.5 A mA Parameter Conditions Min Typ Max Units Miscellaneous Performance RIN Input Resistance CIN Input Capacitance ROUT Output Resistance Closed Loop VO Output Voltage Range RL = VOL 1 M 1.2 pF 0.3 3.6 3.3 3.9 V RL = 100 3.2 3.0 3.5 V CMIR Input Voltage Range Common Mode, CMRR > 60dB 2.8 2.5 3.0 V IO Linear Output Current VOUT 60 50 90 mA 3.3V Electrical Characteristics Unless specified, AV = +2, RF = 250: VS = 3.3V, RL = 100; unless otherwise specified. Boldface limits apply over temperature Range. (Note 2) Symbol Parameter Conditions Min Typ Max Units Frequency Domain Response SSBW -3dB Bandwidth VOUT = 0.5VPP 180 MHz LSBW -3dB Bandwidth VOUT = 3.0VPP 110 MHz SSBWG1 -3dB Bandwidth AV = 1 VOUT = 0.25VPP 450 MHz GFP .1dB Bandwidth VOUT = 1VPP 40 MHz DG Differential Gain RL = 150, 4.43MHz .01 % DP Differential Phase RL = 150, 4.43MHz .06 deg Time Domain Response TRL SR Slew Rate 1V Step 2.2 ns 2V Step (Note 5) 800 V/s Distortion and Noise Response HD2 2nd Harmonic Distortion 2VPP, 20MHz -63 dBc HD3 3rd Harmonic Distortion 2VPP, 20MHz -43 dBc Equivalent Input Noise VN Voltage Noise >1MHz 3.7 nV/ CN Current Noise >1MHz 1.1 pA/ Static, DC Performance VIO Input Offset Voltage 0.8 2.5 3.5 mV IBN Input Bias Current -1 3 6 A IBI Input Offset Current 0 1.5 3 A PSRR Power Supply Rejection Ratio DC, .5V Step 67 CMRR Common Mode Rejection Ratio DC, 1V Step 67 ICC Supply Current RL = 73 dB 75 3.6 dB 5 6 mA Miscellaneous Performance ROUT Input Resistance Close Loop .05 VO Output Voltage Range RL = 2.1 2.3 V RL = 100 1.9 2.0 V VOL 3 www.national.com LMH6609 Symbol LMH6609 Symbol Parameter Conditions CMIR Input Voltage Range Common Mode IO Linear Output Current VOUT Min 30 Typ Max Units 1.3 V 45 mA 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 Section for more details. Note 4: Human body model, 1.5k in series with 100pF. Machine model, 0 In series with 200pF. Note 5: rate is Average of Rising and Falling 40-60% slew rates. Note 6: Nominal Supply voltage range is for supplies with regulation of 10% or better. Connection Diagrams 8-Pin SOIC 5-Pin SOT23 20079039 20079040 Top View Top View Ordering Information Package 8-Pin SOIC 5-SOT23 www.national.com Part Number LMH6609MA LMH6609MAX LMH6609MF LMH6609MFX Package Marking Transport Media 95 Units/Rails LMH6609MA 2.5k Units Tape and Reel 1k Units Tape and Reel A89A 2.5k Units Tape and Reel 4 NSC Drawing M08A MF05A Small Signal Non-Inverting Frequency Response Large Signal Non-Inverting Frequency Response 20079004 20079003 Small Signal Inverting Frequency Response Large Signal Inverting Frequency Response 20079002 20079010 Frequency Response vs. VOUT AV = 2 Frequency Response vs. VOUT AV = 2 20079009 20079001 5 www.national.com LMH6609 Typical Performance Characteristics LMH6609 Frequency Response vs. VOUT AV = 1 Frequency Response vs. VOUT AV = -1 20079007 20079008 Frequency Response vs. VOUT AV = -1 Frequency Response vs. Cap Load 20079042 20079006 Frequency Response vs. Cap Load Suggested ROUT vs. Cap Load 20079043 www.national.com 20079041 6 LMH6609 CMRR vs. Frequency PSRR vs. Frequency 20079011 20079012 PSRR vs. Frequency Pulse Response 20079013 20079016 Pulse Response Large Signal Pulse Response 20079014 20079015 7 www.national.com LMH6609 Noise vs. Frequency HD2 vs. VOUT 20079025 20079018 HD3 vs. VOUT HD2 vs. VOUT 20079020 20079017 HD3 vs. VOUT HD2 & HD3 vs. Frequency 20079021 20079019 www.national.com 8 LMH6609 HD2 & HD3 vs. Frequency Differential Gain & Phase 20079022 20079046 Differential Gain & Phase Open Loop Gain & Phase 20079044 20079047 Open Loop Gain & Phase Closed Loop Output Resistance 20079045 20079023 9 www.national.com LMH6609 Application Section GENERAL DESIGN EQUATION The LMH6609 is a unity gain stable voltage feedback amplifier. The matched input bias currents track well over temperature. This allows the DC offset to be minimized by matching the impedance seen by both inputs. GAIN The non-inverting and inverting gain equations for the LMH6609 are as follows: 20079027 FIGURE 1. Typical Non-Inverting Application www.national.com 10 LMH6609 20079028 FIGURE 2. Typical Inverting Application 20079029 FIGURE 3. Single Supply Inverting 11 www.national.com LMH6609 20079030 FIGURE 4. AC Coupled Non-Inverting EVALUATION BOARDS National Semiconductor offers the following evaluation boards as a guide for high frequency layout and as an aid in device testing and characterization. Many of the datasheet plots were measured with these boards. GAIN BANDWIDTH PRODUCT The LMH6609 is a voltage feedback amplifier, whose closedloop bandwidth is approximately equal to the gain-bandwidth product (GBP) divided by the gain (AV). For gains greater than 5, AV sets the closed-loop bandwidth of the LMH6609. Device LMH6609MA LMH6609MF Package SOIC SOT-23 Board Part # LMH730227 LMH730216 See the LMH6609 Product Folder on www.national.com for evaluation board availability and ordering information. CIRCUIT LAYOUT CONSIDERATION A proper printed circuit layout is essential for achieving high frequency performance. National provides evaluation boards for the LMH6609 as shown above. These boards were laid out for optimum, high-speed performance. The ground plane was removed near the input and output pins to reduce parasitic capacitance. Also, all trace lengths were minimized to reduce series inductances. Supply bypassing is required for the amplifiers performance. The bypass capacitors provide a low impedance return current path at the supply pins. They also provide high frequency filtering on the power supply traces. 10F tantalum and . 01F capacitors are recommended on both supplies (from supply to ground). In addition a .1F ceramic capacitor can be added from V+ to V- to aid in second harmonic suppression. 20079031 For Gains less than 5, refer to the frequency response plots to determine maximum bandwidth. For large signal bandwidth the slew rate is a more accurate predictor of bandwidth. 20079032 Where fMAX = bandwidth, SR = Slew rate and VP = peak amplitude. OUTPUT DRIVE AND SETTLING TIME PERFORMANCE The LMH6609 has large output current capability. The 100mA of output current makes the LMH6609 an excellent choice for applications such as: * Video Line Drivers * Distribution Amplifiers When driving a capacitive load or coaxial cable, include a series resistance ROUT to back match or improve settling time. Refer to the Driving Capacitive Loads section for guidance on selecting an output resistor for driving capacitive loads. www.national.com 12 POWER DISSIPATION The LMH6609 has the ability to drive large currents into low impedance loads. Some combinations of ambient temperature and device loading could result in device overheating. For most conditions peak power values are not as important as RMS powers. To determine the maximum allowable power dissipation for the LMH6609 use the following formula: 20079033 FIGURE 5. Driving Capacitive Loads with ROUT for Improved Stability PMAX = (150 - TAMB)/JA DRIVING CAPACITIVE LOADS Capacitive output loading applications will benefit from the use of a series output resistor ROUT. Figure 5 shows the use of a series output resistor, ROUT as it might be applied when driving an analog to digital converter. The charts "Suggested RO vs. Cap Load" in the Typical Performance Section give a recommended value for mitigating capacitive loads. The values suggested in the charts are selected for .5dB or less of peaking in the frequency response. This gives a good compromise between settling time and bandwidth. For applications where maximum frequency response is needed and some peaking is tolerable, the value of RO can be reduced slightly from the recommended values. There will be amplitude lost in the series resistor unless the gain is adjusted to compensate; this effect is most noticeable with heavy resistive loads. Where TAMB = 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. 150C is the absolute maximum limit for the internal temperature of the device. Either forced air cooling or a heat sink can greatly increase the power handling capability for the LMH6609. VIDEO PERFORMANCE The LMH6609 has been designed to provide good performance with both PAL and NTSC composite video signals. The LMH6609 is specified for PAL signals. NTSC performance is typically marginally better due to the lower frequency content of the signal. 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 transmission line and other parasitic capacitances from the amplifier output stage. This means that the device should be configured for a gain of 2 in order to have a net gain of 1 after the terminating resistor. (See Figure 6) COMPONENT SELECTION AND FEEDBACK RESISTOR Surface mount components are highly recommended for the LMH6609. Leaded components will introduce unpredictable parasitic loading that will interfere with proper device operation. Do not use wire wound resistors. The LMH6609 operates best with a feedback resistor of approximately 250 for all gains of +2 and greater and for -1 and less. With lower gains in particular, large value feedback resistors will exaggerate the effects of parasitic capacitances and may lead to ringing on the pulse response and frequency response peaking. Large value resistors also add undesirable thermal noise. Feedback resistors that are much below 100 will load the output stage, which will reduce voltage output swing, increase device power dissipation, increase distortion and reduce current available for driving the load. In the buffer configuration the output should be shorted directly to the inverting input. This feedback does not load the output stage because the inverting input is a high impedance point and there is no gain set resistor to ground. OPTIMIZING DC ACCURACY The LMH6609 offers excellent DC accuracy. The wellmatched inputs of this amplifier allows even better performance if care is taken to balance the impedances seen by the two inputs. The parallel combination of the gain setting RG and feedback RF resistors should be equal to RSEQ, the resistance of the source driving the op amp in parallel with any terminating Resistor (See Figure 1). Combining this with the non inverting gain equation gives the following parameters: 20079034 FIGURE 6. Typical Video Application ESD PROTECTION The LMH6609 is protected against electrostatic discharge (ESD) on all pins. The LMH6609 will survive 2000V Human Body model or 200V Machine model events. Under closed loop operation the ESD diodes have no effect on circuit performance. There are occasions, however, when the ESD diodes may be evident. For instance, if the amplifier RF = AVRSEQ RG = RF/(AV-1) For Inverting gains the bias current cancellation is accomplished by placing a resistor RB on the non-inverting input 13 www.national.com LMH6609 equal in value to the resistance seen by the inverting input (See Figure 2). RB = RF || (RG + RS) The additional noise contribution of RB can be minimized by the use of a shunt capacitor (not shown). LMH6609 * CD = Equivalent Diode Capacitance * CF = Feedback Capacitance The feedback capacitor is used to give optimum flatness and stability. As a starting point the feedback capacitance should be chosen as 1/2 of the Diode capacitance. Lower feedback capacitors will peak frequency response. is powered down and a large input signal is applied the ESD diodes will conduct. TRANSIMPEDANCE AMPLIFIER The low input current noise and unity gain stability of the LMH6609 make it an excellent choice for transimpedance applications. Figure 7 illustrates a low noise transimpedance amplifier that is commonly implemented with photo diodes. RF sets the transimpedance gain. The photo diode current multiplied by RF determines the output voltage. Rectifier The large bandwidth of the LMH6609 allows for high-speed rectification. A common rectifier topology is shown in Figure 8. R1 and R2 set the gain of the rectifier. 20079035 FIGURE 7. Transimpedance Amplifier 20079036 FIGURE 8. Rectifier Topology The capacitances are defined as: www.national.com 14 LMH6609 Physical Dimensions inches (millimeters) unless otherwise noted 8-Pin SOIC NS Product Number M08A 5-Pin SOT23 NS Product Number MF05A 15 www.national.com LMH6609 900MHz Voltage Feedback Op Amp Notes For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com 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 References www.national.com/vref Design Made Easy www.national.com/easy www.national.com/powerwise Applications & Markets 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 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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