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LT1720CS8 Datasheet(PDF) 3 Page - Linear Technology |
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LT1720CS8 Datasheet(HTML) 3 Page - Linear Technology |
3 / 28 page 3 LT1720/LT1721 ELECTRICAL CHARACTERISTICS The q denotes specifications that apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 5V, VCM = 1V, COUT = 10pF, VOVERDRIVE = 20mV, unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS IB Input Bias Current q –6 0 µA IOS Input Offset Current q 0.6 µA CMRR Common Mode Rejection Ratio (Note 4) q 55 70 dB PSRR Power Supply Rejection Ratio (Note 5) q 65 80 dB AV Voltage Gain (Note 6) ∞ VOH Output High Voltage ISOURCE = 4mA, VIN = VTRIP+ + 10mV q VCC – 0.4 V VOL Output Low Voltage ISINK = 10mA, VIN = VTRIP– – 10mV q 0.4 V ICC Supply Current (Per Comparator) VCC = 5V q 47 mA VCC = 3V q 3.5 6 mA tPD20 Propagation Delay VOVERDRIVE = 20mV (Note 7) 4.5 6.5 ns q 8.0 ns tPD5 Propagation Delay VOVERDRIVE = 5mV (Notes 7, 8) 7 10 ns q 13 ns ∆tPD Differential Propagation Delay (Note 9) Between Channels 0.3 1.0 ns tSKEW Propagation Delay Skew (Note 10) Between tPD +/tPD– 0.5 1.5 ns tr Output Rise Time 10% to 90% 2.5 ns tf Output Fall Time 90% to 10% 2.2 ns tJITTER Output Timing Jitter VIN = 1.2VP-P (6dBm), ZIN = 50Ω tPD+ 15 psRMS VCM = 2V, f = 20MHz tPD – 11 psRMS fMAX Maximum Toggle Frequency VOVERDRIVE = 50mV, VCC = 3V 70.0 MHz VOVERDRIVE = 50mV, VCC = 5V 62.5 MHz Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: If one input is within these common mode limits, the other input can go outside the common mode limits and the output will be valid. Note 3: The LT1720/LT1721 comparators include internal hysteresis. The trip points are the input voltage needed to change the output state in each direction. The offset voltage is defined as the average of VTRIP+ and VTRIP–, while the hysteresis voltage is the difference of these two. Note 4: The common mode rejection ratio is measured with VCC = 5V and is defined as the change in offset voltage measured from VCM = – 0.1V to VCM = 3.8V, divided by 3.9V. Note 5: The power supply rejection ratio is measured with VCM = 1V and is defined as the change in offset voltage measured from VCC = 2.7V to VCC = 6V, divided by 3.3V. Note 6: Because of internal hysteresis, there is no small-signal region in which to measure gain. Proper operation of internal circuity is ensured by measuring VOH and VOL with only 10mV of overdrive. Note 7: Propagation delay measurements made with 100mV steps. Overdrive is measured relative to VTRIP±. Note 8: tPD cannot be measured in automatic handling equipment with low values of overdrive. The LT1720/LT1721 are 100% tested with a 100mV step and 20mV overdrive. Correlation tests have shown that tPD limits can be guaranteed with this test, if additional DC tests are performed to guarantee that all internal bias conditions are correct. Note 9: Differential propagation delay is defined as the larger of the two: ∆tPDLH = tPDLH(MAX) – tPDLH(MIN) ∆tPDHL = tPDHL(MAX) – tPDHL(MIN) where (MAX) and (MIN) denote the maximum and minimum values of a given measurement across the different comparator channels. Note 10: Propagation Delay Skew is defined as: tSKEW = |tPDLH – tPDHL| |
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