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SP206BCT Datasheet(PDF) 6 Page - Sipex Corporation |
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SP206BCT Datasheet(HTML) 6 Page - Sipex Corporation |
6 / 15 page REV: A DATE:12/03/2003 +5V High-Speed RS232 Transceivers © Copyright 2000 Sipex Corporation 6 attain symmetrical ±10V power supplies. Figure 3a shows the waveform found on the positive side of capcitor C 2, and Figure 3b shows the negative side of capcitor C 2. There is a free–running oscillator that controls the four phases of the voltage shifting. A description of each phase follows. Phase 1 — V SS charge storage —During this phase of the clock cycle, the positive side of capacitors C 1 and C 2 are initially charged to +5V. Cl + is then switched to ground and the charge in C 1 – is transferred to C 2 –. Since C 2 + is connected to +5V, the voltage potential across capacitor C 2 is now 10V. Phase 2 — V SS transfer — Phase two of the clock con- nects the negative terminal of C 2 to the VSS storage capacitor and the positive terminal of C 2 to ground, and transfers the generated –l0V to C 3. Simultaneously, the positive side of capaci- tor C 1 is switched to +5V and the negative side is connected to ground. Phase 3 — V DD charge storage — The third phase of the clock is identical to the first phase — the charge transferred in C 1 produces –5V in the negative terminal of C 1, which is applied to the negative side of capacitor C 2. Since C2 + is at +5V, the voltage potential across C 2 is l0V. Phase 4 — V DD transfer — The fourth phase of the clock connects the negative terminal of C 2 to ground, and transfers the generated l0V across C 2 to C4, the V DD storage capacitor. Again, simultaneously with this, the positive side of capacitor C 1 is switched to +5V and the negative side is con- nected to ground, and the cycle begins again. Since both V+ and V– are separately generated from V CC; in a no–load condition V + and V– will be symmetrical. Older charge pump approaches that generate V– from V+ will show a decrease in the magnitude of V– compared to V+ due to the inherent inefficiencies in the design. The clock rate for the charge pump typically operates at 15kHz. The external capacitors can be as low as 0.1 µF with a 16V breakdown voltage rating. The SP200 Series devices are made up of three basic circuit blocks — 1) transmitter/driver, 2) receiver and 3) the Sipex proprietary charge VCC = +5V –5V –5V +5V VSS Storage Capacitor VDD Storage Capacitor C1 C2 C3 C4 + + ++ – – – – Figure 1. Charge Pump — Phase 1 Figure 2. Charge Pump — Phase 2 VCC = +5V –10V VSS Storage Capacitor VDD Storage Capacitor C1 C2 C3 C4 + + ++ – – – – |
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