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LT1227 Datasheet(PDF) 8 Page - Linear Technology |
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LT1227 Datasheet(HTML) 8 Page - Linear Technology |
8 / 12 page 8 LT1227 S APPLICATI I FOR ATIO RF = 1k, RG= 1k, RL = 100Ω VOUT Small-Signal Rise Time, AV = +2 and inverting input bias current will change. The offset voltage changes about 500 µV per volt of supply mis- match. The inverting bias current can change as much as 5.0 µA per volt of supply mismatch, though typically the change is less than 0.5 µA per volt. Slew Rate The slew rate of a current feedback amplifier is not independent of the amplifier gain configuration the way slew rate is in a traditional op amp. This is because both the input stage and the output stage have slew rate limitations. In the inverting mode, and for higher gains in the noninverting mode, the signal amplitude between the input pins is small and the overall slew rate is that of the output stage. For gains less than ten in the noninverting mode, the overall slew rate is limited by the input stage. The input stage slew rate of the LT1227 is approximately 125V/ µs and is set by internal currents and capacitances. The output slew rate is set by the value of the feedback resistors and the internal capacitances. At a gain of ten with a 1k feedback resistor and ±15V supplies, the output slew rate is typically 1100V/ µs. Larger feedback resistors will reduce the slew rate as will lower supply voltages, similar to the way the bandwidth is reduced. The graph of Maximum Undistorted Output vs Frequency relates the slew rate limitations to sinusoidal inputs for various gain configurations. AI01 VOUT RF = 910Ω, RG= 100Ω, RL = 400Ω Large-Signal Transient Response, AV = +10 AI02 Capacitance on the Inverting Input Current feedback amplifiers require resistive feedback from the output to the inverting input for stable operation. Take care to minimize the stray capacitance between the output and the inverting input. Capacitance on the invert- ing input to ground will cause peaking in the frequency response (and overshoot in the transient response), but it does not degrade the stability of the amplifier. Capacitive Loads The LT1227 can drive capacitive loads directly when the proper value of feedback resistor is used. The graph of Maximum Capacitive Load vs Feedback Resistor should be used to select the appropriate value. The value shown is for 5dB peaking when driving a 1k load at a gain of 2. This is a worst case condition, the amplifier is more stable at higher gains and driving heavier loads. Alternatively, a small resistor (10 Ω to 20Ω) can be put in series with the output to isolate the capacitive load from the amplifier output. This has the advantage that the amplifier band- width is only reduced when the capacitive load is present and the disadvantage that the gain is a function of the load resistance. Power Supplies The LT1227 will operate from single or split supplies from ±2V (4V total) to ±15V (30V total). It is not necessary to use equal value split supplies, however the offset voltage |
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