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LT1011AMJ8 Datasheet(PDF) 9 Page - Linear Technology |
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LT1011AMJ8 Datasheet(HTML) 9 Page - Linear Technology |
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9 / 16 page  9 LT1011/LT1011A APPLICATIONS INFORMATION In the “off” state, I1 is switched off and both Q1 and Q2 turn off. The collector of Q2 can be now held at any voltage above V – without conducting current, including voltages above the positive supply level. Maximum voltage above V – is 50V for the LT1011M and 40V for the LT1011C/I. The emitter can be held at any voltage between V + and V – as long as it is negative with respect to the collector. In the “on” state, I1 is connected, turning on Q1 and Q2. Diodes D1 and D2 prevent deep saturation of Q2 to improve speed and also limit the drive current of Q1. The R1/R2 divider sets the saturation voltage of Q2 and pro- vides turn-off drive. Either the collector or emitter pin can be held at a voltage between V + and V –. This allows the remaining pin to drive the load. In typical applications, the emitter is connected to V – or ground and the collector drives a load tied to V + or a separate positive supply. When the emitter is used as the output, the collector is typically tied to V+ and the load is connected to ground or V–. Note that the emitter output is phase reversed with respect to the collector output so that the “+” and “–” input designations must be reversed. When the collector is tied to V+, the voltage at the emitter in the “on” state is about 2V below V+ (see curves). Input Signal Range The common mode input voltage range of the LT1011 is about 300mV above the negative supply and 1.5V below the positive supply, independent of the actual supply voltages (see curve in the Typical Performance Character- istics). This is the voltage range over which the output will respond correctly when the common mode voltage is applied to one input and a higher or lower signal is applied to the remaining input. If one input is inside the common mode range and one is outside, the output will be correct. If the inputs are outside the common mode range in opposite directions, the output will still be correct. If both inputs are outside the common mode range in the same direction, the output will not respond to the differential input; for temperatures of 25 °C and above, the output will remain unconditionally high (collector output), for tem- peratures below 25 °C, the output becomes undefined. TYPICAL APPLICATIONS – + LT1011 5 R2 3k R1 20k 6 7 8 2 3 1011 TA03 V + – + LT1011 3 7 RLOAD 4 1 8 V ++ CAN BE GREATER OR LESS THAN V + V V + V ++ V OR GROUND 2 1011 TA05 Offset Balancing Driving Load Referenced to Positive Supply – + LT1011 INPUTS* 2 7 RLOAD 4 1 8 *INPUT POLARITY IS REVERSED WHEN USING PIN 1 AS OUTPUT V V V + 3 1011 TA06 Driving Load Referenced to Negative Supply |
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