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KM4100 Datasheet(PDF) 7 Page - Fairchild Semiconductor |
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KM4100 Datasheet(HTML) 7 Page - Fairchild Semiconductor |
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7 / 11 page  REV. 1A February 2001 7 General Description The KM4100/KM4101 are single supply, general purpose, voltage-feedback amplifiers fabricated on a complementary bipolar process using a patent pending topology. They feature a rail-to-rail output stage and are unity gain stable. Both gain bandwidth and slew rate are insensitive to temperature. The common mode input range extends to 300mV below ground and to 1.2V below Vs. 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. The design uses a Darlington output stage. The output stage is short circuit protected and offers “soft” saturation protection that improves recovery time. The typical circuit schematic is shown in Figure 1. Figure 1: Typical Configuration At non-inverting gains other than G = +1, keep Rg below 1k Ω to minimize peaking; thus, for optimum response at a gain of +2, a feedback resistor of 1k Ω is recommended. Figure 2 illustrates the KM4100/ KM4101 frequency response with both 1k Ω and 2kΩ feedback resistors. Enable/Disable Function (KM4101) The KM4101 offers an active-low disable pin that can be used to lower its supply current. Leave the pin floating to enable the part. Pull the disable pin to the negative supply (which is ground in a single supply application) to disable the output. During the disable condition, the nominal supply current will drop to below 127 µA and the output will be at high impedance with about 2pF capacitance. Figure 2: Frequency Response vs. Rf 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 reliability degradation will occur. If the maximum junction temperature exceeds 175°C for an extended time, device failure may occur. The KM4100/KM4101 are short circuit protected. However, this may not guarantee that the maximum junction temperature (+150°C) is not exceeded under all conditions. Follow the maximum power derating curves shown in Figure 3 to ensure proper operation. Figure 3: Power Derating Curves Overdrive Recovery For an amplifier, an overdrive condition 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 KM4100/KM4101 will typically recover in less than 20ns from an overdrive condition. Figure 4 shows the KM4100 in an overdriven condition. + - KM4100 Rf 0.01 µF 6.8 µF Out In +Vs + Rg Frequency Reponse vs. Rf Frequency (MHz) 1 10 100 Rf = 2kΩ Rf = 1kΩ G = 2 RL = 2kΩ Vs = +5V Maximum Power Dissipation Ambient Temperature ( C) -50 -30 -10 10 30 50 70 90 SOIC-8 lead 0 0.5 1.0 1.5 2.0 SOT23-6 lead SOT23-5 lead KM4100/KM4101 DATA SHEET |
Similar Part No. - KM4100 |
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Similar Description - KM4100 |
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