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LM6310IM Datasheet(PDF) 13 Page - National Semiconductor (TI) |
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LM6310IM Datasheet(HTML) 13 Page - National Semiconductor (TI) |
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13 / 16 page  Application Information (Continued) VIDEO GAIN OF a2 The design of the LM6310 has been optimized for gain of a 2 video applications The differential gain and phase per- formance of the LM6310 can be improved by addinga1kX pull down to b5V to the output See Figure 1 Typical values for differential gain and phase are 05% dif- ferential gain and 01 degree differential phase VIDEO MULTIPLEXING Figure 2 shows a video multiplexer made from two LM6310 and a logic device which can supply TTL equivalent level to the DISABLE pins of the LM6310s Only one DISABLE line should be high at any one time Note that since a floating value on the DISABLE input is the same as a high input if all of the logic device’s output go to a TRI-STATE or high impedance mode all the LM6310’s will turn on This should be avoided Use adequate decoupling on the logic device to reduce noise feedthrough of digital system and power noise to the video signals If it is not possible to adequately decouple the logic device consider using a small digital buffer such as a hex schmidt trigger inverter which can be decoupled with multiple capacitors andor ferrite beads to reduce digital noise Figure 3 shows a four input video multiplexer With careful layout differential gain and phase performance almost as good as a single LM6310 can be achieved A single 1 kX pull down to b5V should be used Differential gain of about 005% and differential phase of about 03 de- gree are possible with the 41 multiplexer OTHER AMPLIFIERS WITH OUTPUT DISABLE FUNCTIONS The LMC6681 LMC6682 and LMC6684 are 1 MHz amplifi- ers with TRI-STATE outputs which can be used for audio and low frequency multiplexing like the LM6310 is used for video multiplexing 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 g15 and a range of package types such as the space saving SOT23-5 TinyPaKTM (305 mm x 300 mm x 143 mmabout the size of a grain of rice) and the wide S0-8 for better power dissipation This op amp line includes LM6171 100 MHz Low Distortion Amplifier with l 3000 V 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 supplies LM7171 200 MHz Voltage Feedback amplifier with 100 mA output current and 4000 V ms slew rate Supply current of 65 mA Specified at g15V and g 5V Information on these parts is available from your National Semiconductor representative SPICE MACROMODEL A SPICE macromodel of the LM6310 and many other Na- tional Semiconductor op amps is available at no charge from your National Semiconductor representative AV ea2 TLH12545 – 29 FIGURE 1 Improving Video Differential Gain and Phase with 1 kX pull down to b5V http www nationalcom 13 |
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