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LT1397CGN-TR Datasheet(PDF) 10 Page - Linear Technology |
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LT1397CGN-TR Datasheet(HTML) 10 Page - Linear Technology |
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10 / 20 page  10 LT1395/LT1396/LT1397 139567fc Feedback Resistor Selection The small-signal bandwidth of the LT1395/LT1396/LT1397 is set by the external feedback resistors and the internal junction capacitors. As a result, the bandwidth is a func- tion of the supply voltage, the value of the feedback resistor, the closed-loop gain and the load resistor. The LT1395/LT1396/LT1397 have been optimized for ±5V supply operation and have a – 3dB bandwidth of 400MHz at a gain of 1 and 350MHz at a gain of 2. Please refer to the resistor selection guide in the Typical AC Perfor- mance 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). Capacitive Loads The LT1395/LT1396/LT1397 can drive many capacitive loads directly when the proper value of feedback resistor is used. The required value for the feedback resistor will increase as load capacitance increases and as closed-loop gain decreases. Alternatively, a small resistor (5 Ω to 35Ω) 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 capaci- tive load is present. The disadvantage is that the gain is a function of the load resistance. See the Typical Perfor- mance Characteristics curves. Power Supplies The LT1395/LT1396/LT1397 will operate from single or split supplies from ±2V (4V total) to ±6V (12V total). It is not necessary to use equal value split supplies, how- ever the offset voltage and inverting input bias current will change. The offset voltage changes about 2.5mV per volt of supply mismatch. The inverting bias current will typically change about 10 µA per volt of supply mismatch. S APPLICATI I FOR ATIO Slew Rate Unlike a traditional voltage feedback op amp, the slew rate of a current feedback amplifier is not independent of the amplifier gain configuration. In a current feedback ampli- fier, both the input stage and the output stage have slew rate limitations. In the inverting mode, and for gains of 2 or more 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 2 in the noninverting mode, the overall slew rate is limited by the input stage. The input slew rate of the LT1395/LT1396/LT1397 is approximately 600V/ µsandissetbyinternalcurrentsand capacitances. The output slew rate is set by the value of the feedback resistor and internal capacitance. At a gain of 2 with 255 Ω feedback and gain resistors and ±5V supplies, the output slew rate is typically 800V/ µs. Larger feedback resistors will reduce the slew rate as will lower supply voltages. Enable/ Disable The LT1395CS6 has a unique high impedance, zero supply current mode which is controlled by the EN pin. The LT1395CS6 is designed to operate with CMOS logic; it draws virtually zero current when the EN pin is high. To activate the amplifier, its EN pin is normally pulled to a logic low. However, supply current will vary as the voltage between the V + supply and EN is varied. As seen in Figure 1, +IS does vary with (V + – VEN), particularly when the voltage difference is less than 3V. For normal operation, Figure 1. + IS vs (V + – VEN) V + – VEN (V) 0 0 0.5 1.5 2.0 2.5 5.0 3.5 2 4 5 1395/6/7 F01 1.0 4.0 4.5 3.0 1 3 6 7 TA = 25°C V + = 5V V – = – 5V V – = 0V |
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