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ISL83386EIVZ Datasheet(PDF) 7 Page - Intersil Corporation |
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ISL83386EIVZ Datasheet(HTML) 7 Page - Intersil Corporation |
7 / 10 page 7 FN6034.1 November 19, 2004 When using minimum required capacitor values, make sure that capacitor values do not degrade excessively with temperature. If in doubt, use capacitors with a larger nominal value. The capacitor’s equivalent series resistance (ESR) usually rises at low temperatures and it influences the amount of ripple on V+ and V-. Power Supply Decoupling In most circumstances a 0.1 µF bypass capacitor is adequate. In applications that are particularly sensitive to power supply noise, decouple VCC to ground with a capacitor of the same value as the charge-pump capacitor C1. Connect the bypass capacitor as close as possible to the IC. Transmitter Outputs when Exiting Powerdown Figure 3 shows the response of two transmitter outputs when exiting powerdown mode. As they activate, the two transmitter outputs properly go to opposite RS-232 levels, with no glitching, ringing, nor undesirable transients. Each transmitter is loaded with 3k Ω in parallel with 2500pF. Note that the transmitters enable only when the magnitude of the supplies exceed approximately 3V. High Data Rates The ISL83386E maintains the RS-232 ±5V minimum transmitter output voltages even at high data rates. Figure 4 details a transmitter loopback test circuit, and Figure 5 illustrates the loopback test result at 120kbps. For this test, all transmitters were simultaneously driving RS-232 loads in parallel with 1000pF, at 120kbps. Figure 6 shows the loopback results for a single transmitter driving 1000pF and an RS-232 load at 250kbps. The static transmitters were also loaded with an RS-232 receiver. TIME (20 µs/DIV.) T1 2V/DIV 5V/DIV VCC = +3.3V SHDN FIGURE 3. TRANSMITTER OUTPUTS WHEN EXITING POWERDOWN C1 - C4 = 0.1 µF T2 FIGURE 4. TRANSMITTER LOOPBACK TEST CIRCUIT FIGURE 5. LOOPBACK TEST AT 120kbps FIGURE 6. LOOPBACK TEST AT 250kbps ISL83386E VCC C1 C2 C4 C3 + + + + 1000pF V+ V- 5k TIN ROUT C1+ C1- C2+ C2- RIN TOUT + VCC 0.1 µF VCC SHDN VL T1IN T1OUT R1OUT 5 µs/DIV. VCC = +3.3V 5V/DIV. C1 - C4 = 0.1 µF T1IN T1OUT R1OUT 2 µs/DIV. 5V/DIV. VCC = +3.3V C1 - C4 = 0.1 µF ISL83386E |
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