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ICL3238ECA Datasheet(PDF) 10 Page - Intersil Corporation |
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ICL3238ECA Datasheet(HTML) 10 Page - Intersil Corporation |
10 / 14 page 10 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 0.1µF 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. Operation Down to 2.7V ICL3238E transmitter outputs meet RS-562 levels (±3.7V), at full data rate, with VCC as low as 2.7V. RS-562 levels typically ensure inter operability with RS-232 devices. Transmitter Outputs when Exiting Powerdown Figure 10 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 ICL3238E maintains the RS-232 ±5V minimum transmitter output voltages even at high data rates. Figure 11 details a transmitter loopback test circuit, and Figure 12 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 13 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 (20µs/DIV.) T1 T2 2V/DIV 5V/DIV VCC = +3.3V FORCEOFF FIGURE 10. TRANSMITTER OUTPUTS WHEN EXITING POWERDOWN C1 - C4 = 0.1µF FIGURE 12. LOOPBACK TEST AT 120kbps FIGURE 13. LOOPBACK TEST AT 250kbps ICL3238E VCC FORCEOFF C1 C2 C4 C3 + + + + 1000pF V+ V- 5k TIN ROUT C1+ C1- C2+ C2- RIN TOUT + VCC 0.1µF VCC FORCEON FIGURE 11. TRANSMITTER LOOPBACK TEST CIRCUIT T1IN T1OUT R1OUT 5µs/DIV. VCC = +3.3V 5V/DIV. C1 - C4 = 0.1µF T1IN T1OUT R1OUT 2µs/DIV. 5V/DIV. VCC = +3.3V C1 - C4 = 0.1µF ICL3238E |
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