Datasheet LT1206 (Analog Devices) - 10
| Manufacturer | Analog Devices |
| Description | 250mA/60MHz Current Feedback Amplifier |
| Pages / Page | 18 / 10 — applicaTions inForMaTion. Slew Rate. Figure 4a. Large-Signal Response vs … |
| File Format / Size | PDF / 372 Kb |
| Document Language | English |
applicaTions inForMaTion. Slew Rate. Figure 4a. Large-Signal Response vs IQ, AV = –1
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Text Version of Document
LT1206
applicaTions inForMaTion
For applications where the full bandwidth of the amplifier
Slew Rate
is not required, the quiescent current of the device may be Unlike a traditional op amp, the slew rate of a current reduced by connecting a resistor from the shutdown pin feedback amplifier is not independent of the amplifier gain to ground. The quiescent current will be approximately 40 configuration. There are slew rate limitations in both the times the current in the shutdown pin. The voltage across input stage and the output stage. In the inverting mode, the resistor in this condition is V+ – 3VBE. For example, a and for higher gains in the noninverting mode, the signal 60k resistor will set the quiescent supply current to 10mA amplitude on the input pins is small and the overall slew with VS = ±15V. rate is that of the output stage. The input stage slew rate The photos (Figures 4a and 4b) show the effect of reducing is related to the quiescent current and will be reduced as the quiescent supply current on the large-signal response. the supply current is reduced. The output slew rate is set The quiescent current can be reduced to 5mA in the invert- by the value of the feedback resistors and the internal ing configuration without much change in response. In capacitance. Larger feedback resistors will reduce the slew noninverting mode, however, the slew rate is reduced as rate as will lower supply voltages, similar to the way the the quiescent current is reduced. 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. RF = 750Ω 50ns/DIV 1206 F04a RL = 50Ω IQ = 5mA, 10mA, 20mA VS = ±15V
Figure 4a. Large-Signal Response vs IQ, AV = –1
RF = 825Ω 20ns/DIV 1206 F05a RL = 50Ω VS = ±15V
Figure 5a. Large-Signal Response, AV = 1
RF = 750Ω 50ns/DIV 1206 F04b RL = 50Ω IQ = 5mA, 10mA, 20mA RF = RG = 750Ω 20ns/DIV 1206 F05b VS = ±15V RL = 50Ω V
Figure 4b. Large-Signal Response vs I
S = ±15V
Q, AV = 2 Figure 5b. Large-Signal Response, AV = –1
1206fb 10 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Small-Signal Bandwidth Typical Performance Characteristics Simplified Schematic Applications Information Package Description Revision History Related Parts
applicaTions inForMaTion
For applications where the full bandwidth of the amplifier
Slew Rate
is not required, the quiescent current of the device may be Unlike a traditional op amp, the slew rate of a current reduced by connecting a resistor from the shutdown pin feedback amplifier is not independent of the amplifier gain to ground. The quiescent current will be approximately 40 configuration. There are slew rate limitations in both the times the current in the shutdown pin. The voltage across input stage and the output stage. In the inverting mode, the resistor in this condition is V+ – 3VBE. For example, a and for higher gains in the noninverting mode, the signal 60k resistor will set the quiescent supply current to 10mA amplitude on the input pins is small and the overall slew with VS = ±15V. rate is that of the output stage. The input stage slew rate The photos (Figures 4a and 4b) show the effect of reducing is related to the quiescent current and will be reduced as the quiescent supply current on the large-signal response. the supply current is reduced. The output slew rate is set The quiescent current can be reduced to 5mA in the invert- by the value of the feedback resistors and the internal ing configuration without much change in response. In capacitance. Larger feedback resistors will reduce the slew noninverting mode, however, the slew rate is reduced as rate as will lower supply voltages, similar to the way the the quiescent current is reduced. 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. RF = 750Ω 50ns/DIV 1206 F04a RL = 50Ω IQ = 5mA, 10mA, 20mA VS = ±15V
Figure 4a. Large-Signal Response vs IQ, AV = –1
RF = 825Ω 20ns/DIV 1206 F05a RL = 50Ω VS = ±15V
Figure 5a. Large-Signal Response, AV = 1
RF = 750Ω 50ns/DIV 1206 F04b RL = 50Ω IQ = 5mA, 10mA, 20mA RF = RG = 750Ω 20ns/DIV 1206 F05b VS = ±15V RL = 50Ω V
Figure 4b. Large-Signal Response vs I
S = ±15V
Q, AV = 2 Figure 5b. Large-Signal Response, AV = –1
1206fb 10 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Small-Signal Bandwidth Typical Performance Characteristics Simplified Schematic Applications Information Package Description Revision History Related Parts
