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LT1214CS датащи(PDF) 15 Page - Linear Integrated Systems |
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LT1214CS датащи(HTML) 15 Page - Linear Integrated Systems |
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15 / 20 page ![]() 15 LT1213/LT1214 S APPLICATI I FOR ATIO Comparator Applications Sometimes it is desirable to use an op amp as a compara- tor. When operating the LT1213/LT1214 on a single 3.3V or 5V supply, the output interfaces directly with most TTL and CMOS logic. The response time of the LT1213/LT1214 is a strong function of the amount of input overdrive as shown in the 4 2 0 100 0 4 2 0 100 0 5 µs/DIV VS = 5V 1213/14 AI02 RL = ∞ LT1213 Comparator Response (+) 20mV, 10mV, 5mV, 2mV Overdrives LT1213 Comparator Response (–) 20mV, 10mV, 5mV, 2mV Overdrives I SPLII F ED S A CHE TIC following photos. These amplifiers are unity-gain stable op amps and not fast comparators, therefore, the logic being driven may oscillate due to the long transition time. The output can be speeded up by adding 20mV or more of hysteresis (positive feedback), but the offset is then a function of the input direction. VS = 5V 1213/14 AI01 RL = ∞ 5 µs/DIV CI Q5 Q10 CF RF I7 I8 CO V– CM BIAS OUT V + I6 I5 I4 I3 I2 I1 –IN +IN 1213/14 SS Q7 Q9 Q8 Q11 Q12 Q14 Q15 Q13 Q16 Q6 Q3 Q4 Q1 Q2 |
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