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LM6317IN Datasheet(PDF) 7 Page - National Semiconductor (TI) |
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LM6317IN Datasheet(HTML) 7 Page - National Semiconductor (TI) |
7 / 8 page Application Notes (Continued) Termination In high frequency applications reflections occur if signals are not properly terminated To minimize reflection coaxial cable with matching characteristic impedance to the signal source should be used The other end of the cable should be terminated with the same value terminator or resistor For the commonly used cables RG59 has 75X characteris- tics impedance and RG58 has 50X characteristics imped- ance Driving Capacitive Loads Amplifiers driving capacitive loads can oscillate or have ring- ing at the output To eliminate oscillation or reduce ringing an isolation resistor can be placed as shown below in Figure 4 The combination of the isolation resistor and the load capacitor froms a pole to incease stability by adding more phase margin to the overall system The desired per- formance depends on the value of the isolation resistor the bigger the isolation resistor the more damped the pulse response becomes A 50X isolation resistor is recommend- ed for initial evaluation TLH12542 – 23 FIGURE 4 Driving Capacitive Load Other High Speed and Video Amplifiers National Semiconductor has an extensive line of high speed amplifiers with a range of operating voltage from 3V single supply to g15V and a range of package types such as the space saving SOT23-5 TinyPakTM (305mm c 300mm c 143mm - about the size of a grain of rice) and a wide SO-8 for better power dissipation This op amp line includes - LM6171 100 MHz low distortion amplifier with greater than 3000V ms slew rate Voltage feedback design draws only 25 mA Specified at g15V and g5V supplies LM7131 TinyPak (SOT23-5) video amplifier with 70 MHz gain bandwidth Specified at 3V 5V and g5V sup- plies LM7171 200 MHz voltage feedback amplifier with 100 mA output current and 4000V ms slew rate Supply current of 65 mA Specified at g15V and g5V supplies Information on these parts is available from your National Semiconductor representative Physical Dimensions inches (millimeters) unless otherwise noted 8-Pin Small Outline Order Number LM6317IM or LM6317IMX NSC Package Number M08A http www nationalcom 7 |
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