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LT1206 Datasheet(PDF) 10 Page - Linear Technology |
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LT1206 Datasheet(HTML) 10 Page - Linear Technology |
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10 / 16 page  10 LT1206 S APPLICATI I FOR ATIO Slew Rate Unlike a traditional op amp, the slew rate of a current feedback amplifier is not independent of the amplifier gain configuration. There are slew rate limitations in both the input stage and the output stage. In the inverting mode, and for higher gains in the noninverting mode, the signal amplitude on the input pins is small and the overall slew rate is that of the output stage. The input stage slew rate is related to the quiescent current and will be reduced as the supply current is reduced. The output slew rate is set by the value of the feedback resistors and the internal capacitance. Larger feedback resistors will reduce the slew rate as will lower supply voltages, similar to the way the bandwidth is reduced. The photos (Figures 5a, 5b and 5c) show the large-signal response of the LT1206 for various gain configurations. The slew rate varies from 860V/ µs for a gain of 1, to 1400V/µs for a gain of –1. LT1206 • F05a RF = 825Ω RL = 50Ω VS = ±15V Figure 5a. Large-Signal Response, AV = 1 Figure 5b. Large-Signal Response, AV = –1 LT1206 • F05b RF = RG = 750Ω RL = 50Ω VS = ±15V For applications where the full bandwidth of the amplifier is not required, the quiescent current of the device may be reduced by connecting a resistor from the shutdown pin to ground. The quiescent current will be approximately 40 times the current in the shutdown pin. The voltage across the resistor in this condition is V+ – 3VBE. For example, a 60k resistor will set the quiescent supply current to 10mA with VS = ±15V. The photos (Figures 4a and 4b) show the effect of reducing the quiescent supply current on the large-signal response. The quiescent current can be reduced to 5mA in the inverting configuration without much change in response. In noninverting mode, however, the slew rate is reduced as the quiescent current is reduced. LT1206 • F04a RF = 750Ω RL = 50Ω IQ = 5mA, 10mA, 20mA VS = ±15V LT1206 • F04b RF = 750Ω RL = 50Ω IQ = 5mA, 10mA, 20mA VS = ±15V Figure 4b. Large-Signal Response vs IQ, AV = 2 Figure 4a. Large-Signal Response vs IQ, AV = –1 |
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Similar Description - LT1206 |
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