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LT1260 Datasheet(PDF) 7 Page - Linear Technology |
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LT1260 Datasheet(HTML) 7 Page - Linear Technology |
7 / 12 page 7 LT1259/LT1260 Feedback Resistor Selection The small-signal bandwidth of the LT1259/ LT1260 are set by the external feedback resistors and the internal junction capacitors. As a result, the bandwidth is a function of the supply voltage, the value of the feedback resistor, the closed-loop gain and the load resistor. The LT1259/LT1260 have been optimized for ±5V supply operation and have a – 3dB bandwidth of 90MHz. See resistor selection guide in Typical AC Performance table. 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). See the section on Demo Board Information. Capacitive Loads The LT1259/LT1260 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 150Ω load at a gain of 2. This is a worst case condition. The amplifier is more stable at higher gains. 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 bandwidth is only reduced when the capacitive load is present. The disadvantage is that the gain is a function of the load resistance. Power Supplies The LT1259/LT1260 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 and inverting input bias current will change. The offset voltage changes about 500 µV per volt of supply mismatch. The inverting bias current can change as much as 5 µA per volt of supply mismatch though typically, the change is about 0.1 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 nonin- verting 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. EN +IN –IN OUT V+ V– LT1259/60 • SS , each amplifier SI PLIFIED SCHE ATIC APPLICATIO S I FOR ATIO |
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