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LMV116 データシート(PDF) 9 Page - National Semiconductor (TI) |
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LMV116 データシート(HTML) 9 Page - National Semiconductor (TI) |
9 / 13 page Typical Performance Characteristics At T J = 25˚C. Unless otherwise specified. (Continued) Souce Current vs. V OUT 20080711 Application Notes CIRCUIT DESCRIPTION The LMV116 and LMV118 are based on National Semicon- ductor’s proprietary VIP10 dielectrically isolated bipolar pro- cess. The LMV116 and LMV118 architecture features the follow- ing: • Complimentary bipolar devices with exceptionally high f t ( ∼8GHz) even under low supply voltage (2.7V) and low Collector bias current. • Common Emitter push-pull output stage capable of 20mA output current (at 0.5V from the supply rails) while con- suming only 600µA of total supply current. This architec- ture allows output to reach within milli-volts of either supply rail at light loads. • Consistent performance from any supply voltage (2.7V- 10V) with little variation with supply voltage for the most important specifications (e.g. BW, SR, I OUT, etc.) MICRO-POWER SHUTDOWN The LMV118 can be shutdown to save power and reduce its supply current to less than 50µA guaranteed, by applying a voltage to the SD pin. The SD pin is “active high” and needs to be tied to V − for normal operation. This input is low current (<20µA, 4pF equivalent capacitance) and a resistor to V − ( ≤20kΩ) will result in normal operation. Shutdown is guaran- teed when SD pin is 0.4V or less from V + at any operating supply voltage and temperature. In the shutdown mode, essentially all internal device biasing is turned off in order to minimize supply current flow and the output goes into Hi-Z (high impedance) mode. Complete device Turn-on and Turn-off times vary considerably relative to the output loading conditions, output voltage, and input impedance, but is generally limited to less than 1µs (see tables for actual data). During shutdown, the input stage has an equivalent circuit as shown below in Figure 1 As can be seen above, in shutdown, there may be current flow through the internal diodes shown, caused by input potential, if present. This current may flow through the exter- nal feedback resistor and result in an apparent output signal. In most shutdown applications the presence of this output is inconsequential. However, if the output is “forced” by another device such as in a multiplexer, the other device will need to conduct the current described in order to maintain the output potential. To keep the output at or near ground during shutdown when there is no other device to hold the output low, a switch (transistor) could be used to shunt the output to ground. Figure 2 shows a circuit where a NPN bipolar is used to keep the output near ground ( ∼80mV): 20080756 FIGURE 1. LMV118 Equivalent Input in Shutdown Mode www.national.com 9 |
同様の部品番号 - LMV116 |
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同様の説明 - LMV116 |
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