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LT1190CS8 Datasheet(PDF) 10 Page - Linear Technology |
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LT1190CS8 Datasheet(HTML) 10 Page - Linear Technology |
10 / 12 page 10 LT1190 A 1X Scope Probe Is a Large Capacitive Load An Unterminated Cable Is a Large Capacitive Load Murphy Circuits Driving Capacitive Load Driving Capacitive Load The ability to maintain shutoff is shown on the curve Shutdown Supply Current vs Temperature in the Typical Performance Characteristics section. At very high elevated temperatures it is important to hold the shut- down 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 LT1190 in order to realize its full capability. Although the LT1190 can drive a 50pF load, isolating the capacitance with 10 Ω can be helpful. Precautions prima- rily 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 capacitance 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 = 300 Ω.) APPLICATIO S I FOR ATIO LT1190 • TA13 COAX 5V –5V 4 2 7 3 6 2 5V 7 –5V 4 3 6 SCOPE PROBE 2 5V 7 –5V 4 3 6 1X SCOPE PROBE + – LT1190 + – LT1190 + – LT1190 A Scope Probe on the Inverting Input Reduces Phase Margin LT1190 • TA11 AV = –1, IN DEMO BOARD, CL = 50pF LT1190 • TA12 AV = –1, IN DEMO BOARD, CL = 50pF WITH 10 Ω ISOLATING RESISTOR |
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