Datasheet LT1210X (Analog Devices) - 10

LT1210X APPLICATIONS INFORMATION R 1210X F04a F = 750Ω IQ = 9mA, 18mA, 36mA RF = 825Ω VS = ±15V 1210X F05a RL = 10Ω VS = ±15V RL = 10Ω
Figure 4a. Large-Signal Response vs IQ, AV = –1 Figure 5a. Large-Signal Response, AV = 1
R 1210X F04b F = 750Ω IQ = 9mA, 18mA, 36mA R R V L = 10Ω VS = ±15V F = RG = 750Ω S = ±15V 1210X F05b RL = 10Ω
Figure 4b. Large-Signal Response vs IQ, AV = 2 Figure 5b. Large-Signal Response, AV = –1 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 RF = RG = 750Ω VS = ±15V 1210X F05c RL = 10Ω capacitance. Larger feedback resistors will reduce the slew rate as will lower supply voltages, similar to the way
Figure 5c. Large-Signal Response, AV = 2
the bandwidth is reduced. The photos in Figures 5a, 5b and 5c show the large-signal response of the LT1210X for various gain configurations. The slew rate varies from 770V/µs for a gain of 1, to 1100V/µs for a gain of –1. 1210Xfa 10 For more information www.linear.com/LT1210X