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LTC1690I Datasheet(PDF) 7 Page - Linear Technology |
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LTC1690I Datasheet(HTML) 7 Page - Linear Technology |
7 / 12 page 7 LTC1690 SWITCHI G TI E WAVEFOR S –VO D 3V 0V tPLH VO = V(A) – V(B) VO Z Y tSKEW tSKEW tr f = 1MHz, tr ≤ 10ns, tf ≤ 10ns 1.5V 90% 10% 50% tPHL tf 1.5V 90% 10% 50% VO 1/2 VO 1690 F04 Figure 4. Driver Propagation Delays f = 1MHz, tr ≤ 10ns, tf ≤ 10ns NOTE: tSKD = |tPHL – tPLH| INPUT OUTPUT A – B R VOD2 –VOD2 5V VOL tPHL 0V 1.5V tPLH 0V 1.5V 1690 F05 Figure 5. Receiver Propagation Delays FUNCTION TABLES Driver DZ Y 101 010 Receiver A – B R ≥ –0.01V 1 ≤ –0.20V 0 Inputs Open 1 Inputs Shorted 1 Note: Table valid with or without termination resistors. 1690 F01 Y Z R R VOD2 VOC 1690 F02 Y Z 60 Ω 375 Ω VOD3 VTST –7V TO 12V 375 Ω 1690 F03 D Y Z RDIFF A B 15pF CL1 CL2 R + + + Figure 1. Driver DC Test Load #1 Figure 2. Driver DC Test Load #2 Figure 3. Driver/Receiver Timing Test Load TEST CIRCUITS PIN FUNCTIONS VCC (Pin 1): Positive Supply. 4.75V < VCC < 5.25V. R (Pin 2): Receiver Output. R is high if (A – B) ≥ –10mV and low if (A – B) ≤ –200mV. D (Pin 3): Driver Input. If D is high, Y is taken high and Z is taken low. If D is low, Y is taken low and Z is taken high. GND (Pin 4): Ground. Y (Pin 5): Driver Output. Z (Pin 6): Driver Output. B (Pin 7): Receiver Input. A (Pin 8): Receiver Input. |
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