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KM4270IC8TR3 Datasheet(PDF) 7 Page - Fairchild Semiconductor |
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KM4270IC8TR3 Datasheet(HTML) 7 Page - Fairchild Semiconductor |
7 / 16 page KM4170, KM4270, KM4470 DATA SHEET REV. 5 December 2002 7 Application Information General Description The KM4X70 family of amplifiers are single supply, general purpose, voltage-feedback amplifiers. They are fabricated on a complementary bipolar process, feature a rail-to-rail input and output, and are unity gain stable. The typical non-inverting circuit schematic is shown in Figure 1. Figure 1: Typical Non-inverting Configuration Input Common Mode Voltage The common mode input range extends to 250mV below ground and to 250mV above Vs, in single supply operation. Exceeding these values will not cause phase reversal. However, if the input voltage exceeds the rails by more than 0.5V, the input ESD devices will begin to conduct. The output will stay at the rail during this overdrive condition. If the absolute maximum input voltage (700mV beyond either rail) is exceeded, externally limit the input current to ±5mA as shown in Figure 2. Figure 2: Circuit for Input Current Protection Power Dissipation The maximum internal power dissipation allowed is directly related to the maximum junction temperature. If the maximum junction temperature exceeds 150°C, some performance degradation will occur. If the maximum junction temperature exceeds 175°C for an extended time, device failure may occur. Overdrive Recovery Overdrive of an amplifier occurs when the output and/or input ranges are exceeded. The recovery time varies based on whether the input or output is overdriven and by how much the ranges are exceeded. The KM4X70 will typically recover in less than 50ns from an overdrive condition. Figure 3 shows the KM4X70 amplifier family in an overdriven condition. Figure 3: Overdrive Recovery Driving Capacitive Loads The Frequency Response vs. CL plot, illustrates the response of the KM4X70 amplifier family. A small series resistance (Rs) at the output of the amplifier, illustrated in Figure 4, will improve stability and settling performance. Rs values in the Frequency Response vs. CL plot were chosen to achieve maximum bandwidth with less than 2dB of peaking. For maximum flatness, use a larger Rs. Capacitive loads larger than 50pF require the use of Rs. Figure 4: Typical Topology for driving a capacitive load Driving a capacitive load introduces phase-lag into the output signal, which reduces phase margin in the amplifier. The unity gain follower is the most sensitive configuration. In a unity gain follower configuration, the KM4X70 amplifier family requires a 510 Ω series resistor to drive a 100pF load. + - KM4100 Rf 0.01µF 6.8µF Out In +Vs + Rg R12 Rout R11 R2 Time (10µs/div) Output Input G = 5 - + 10kΩ Vo Vin + - Rf Rg Rs CL RL |
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