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LT1013MH Datasheet(PDF) 8 Page - Linear Technology |
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LT1013MH Datasheet(HTML) 8 Page - Linear Technology |
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8 / 20 page  8 LT1013/LT1014 APPLICATIONS INFORMATION (b) When the input is more than 400mV below ground (at 25 °C), the input stage saturates (transistors Q3 and Q4) and phase reversal occurs at the output. This can cause lock-up in servo systems. Due to a unique phase reversal protection circuitry (Q21, Q22, Q27, Q28), the LT1013/ 1014’s outputs do not reverse, as illustrated below, even when the inputs are at –1.5V. There is one circumstance, however, under which the phase reversal protection circuitry does not function: when the other op amp on the LT1013, or one specific amplifier of the other three on the LT1014, is driven hard into negative saturation at the output. Phase reversal protection does not work on amplifier: A when D’s output is in negative saturation. B’s and C’s outputs have no effect. B when C’s output is in negative saturation. A’s and D’s outputs have no effect. C when B’s output is in negative saturation. A’s and D’s outputs have no effect. D when A’s output is negative saturation. B’s and C’s outputs have no effect. At the output, the aforementioned single supply designs either cannot swing to within 600mV of ground (OP-20) or cannot sink more than a few microamperes while swing- ing to ground (LM124, LM158). The LT1013/1014’s all-NPN output stage maintains its low output resistance and high gain characteristics until the output is saturated. In dual supply operations, the output stage is crossover distortion-free. Comparator Applications The single supply operation of the LT1013/1014 lends itself to its use as a precision comparator with TTL compatible output: In systems using both op amps and comparators, the LT1013/1014 can perform multiple duties; for example, on the LT1014, two of the devices can be used as op amps and the other two as comparators. 4V LT1013/LT1014 NO PHASE REVERSAL 2V 4V 0V 6Vp-p INPUT, – 1.5V TO 4.5V 4V LM324, LM358, OP-20 EXHIBIT OUTPUT PHASE REVERSAL VS = 5V, 0V 50 µs/DIV 4 2 0 – 100 0 VS = 5V, 0V 50 µs/DIV 2 0 0 100 Voltage Follower with Input Exceeding the Negative Common-Mode Range Comparator Rise Response Time 10mV, 5mV, 2mV Overdrives Comparator Fall Response Time to 10mV, 5mV, 2mV Overdrives 2V 2V 0V 0V 4 |
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