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LMS202CMWX Datasheet(PDF) 4 Page - National Semiconductor (TI) |
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LMS202CMWX Datasheet(HTML) 4 Page - National Semiconductor (TI) |
4 / 5 page Electrical Characteristics (Continued) Over recommended operating supply and temperature ranges unless otherwise specified C1 = C2 = C3 = C4 = Cbp = 0.1µF Symbol Parameter Conditions Min (Note 5) Typ Max (Note 5) Units V SLEW Transition Region Slew Rate T A = 25˚C, VS =5V C L = 50pF to 1000pF, RL =3k Ω to 7kΩ Measured from +3V to −3V or vice versa 3 6 30 V/µs Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the Electrical Characteristics. Note 2: Human Body Model, 1.5k Ω in series with 100pF Note 3: The maximum power dissipation is a function of TJ(MAX), θJA, and TA. The maximum allowable power dissipation at any ambient temperature is PD = (TJ(MAX) −TA)/ θJA. All numbers apply for packages soldered directly onto a PC board. Note 4: Typical Values represent the most likely parametric norm. Note 5: All limits are guaranteed by testing or statistical analysis Note 6: Machine model, 0 Ω in series with 200pF Typical Characteristics Transmitter Output High Voltage vs. Load Capacitance Transmitter Slew Rate vs. Load Capacitance 20062902 20062903 Application Information CAPACITOR SELECTION The recommended capacitors are 0.1µF. However, larger capacitors for the charge pump may be used to minimized ripples on V+ and V− pins. POWER SUPPLY DECOUPLING In some applications that are sensitive to power supply noise from the charge pump, place a decoupling capacitor, Cbp, from V S to GND. Use at least a 0.1µF capacitor or the same size as the charge pump capacitors (C1 − C4). CHARGED PUMP The dual internal charged-pump provides the ±10V to the to transmitters. Using capacitor C1, the charge pump converts +5V to +10V then stores the +10V in capacitor C3. The charge pump uses capacitor C2 to invert the +10V to −10V. The −10V is then stored in capacitor C4. www.national.com 4 |
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