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LT1193CN8 Datasheet(PDF) 10 Page - Linear Technology |
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LT1193CN8 Datasheet(HTML) 10 Page - Linear Technology |
10 / 12 page 10 LT1193 1193fb termination is preferred because reflected energy is ab- sorbed at each end of the cable. When using the double termination technique it is important to note that the signal is attenuated by a factor of 2, or 6dB. The cable driver has a – 3dB bandwidth of 80MHz while driving a 150 Ω load. Using the Shutdown Feature The LT1193 has a unique feature that allows the amplifier to be shut down for conserving power or for multiplexing several amplifiers onto a common cable. The amplifier will shut down by taking Pin 5 to V–. In shutdown, the amplifier dissipates 15mW while maintaining a true high impedance output state of 15k Ω in parallel with the feedback resis- tors. The amplifiers may be connected inverting, nonin- verting or differential for MUX applications. When the output is loaded with as little as 1k Ω from the amplifier’s feedback resistors, the amplifier shuts off in 200ns. This shutoff can be under the control of HC CMOS operating between 0V and – 5V. APPLICATIO S I FOR ATIO LT1193 • TA12 1MHz SINE WAVE GATED OFF WITH SHUTDOWN PIN, AV = 3, RFB = 1k, RG = 500Ω tOFF = 200ns tON = 300ns Driving Capacitive Load Driving Capacitive Load LT1193 • TA14 AV = 2, IN DEMO BOARD, CL = 30pF, RFB = 1k, RG = 1k LT1193 • TA15 AV = 2, IN DEMO BOARD, CL = 30pF WITH 10 Ω ISOLATING RESISTOR isolating the capacitance with 10 Ω can be helpful. Precau- tions primarily have to do with driving large capacitive loads. Other precautions include: 1. Use a ground plane (see Design Note 50, High Fre- quency Amplifier Evaluation Board). 2. Do not use high source impedances. The input capaci- tance of 2pF, and RS = 10k for instance, will give an 8MHz – 3dB bandwidth. 3. PC board socket may reduce stability. 4. A feedback resistor of 1k or lower reduces the effects of stray capacitance at the inverting input. (For instance, closed-loop gain of ±2 can use RFB = 300Ω and RG = 300Ω.) Output Shutdown The ability to maintain shutoff is shown on the curve Shutdown Supply Current vs Temperature in the Typical Performance Characteristics section. At very high el- evated temperatures it is important to hold the SHDN pin close to the negative supply to keep the supply current from increasing. Murphy Circuits There are several precautions the user should take when using the LT1193 in order to realize its full capability. Although the LT1193 can drive a 30pF in gains as low as 2, |
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