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EL6201CYZ Datasheet(PDF) 8 Page - Intersil Corporation |
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EL6201CYZ Datasheet(HTML) 8 Page - Intersil Corporation |
8 / 10 page 8 FN7216.3 August 2, 2007 used to adjust initial operating points, but they should be replaced with fixed resistors for further testing. External voltage sources can be coupled to the RAMP and RFREQ pins to effect frequency or amplitude modulation or adjustment. It is recommended that a coupling resistor be installed in series with the control voltage and mounted directly next to the EL6201 pin. This will keep the inevitable high-frequency noise of the EL6201’s local environment from propagating to the modulation source, and it will keep parasitic capacitance at the EL6201 pin minimized. Both inputs have several megahertz of bandwidth for analog modulation. The output enable pin can be used to pass digital modulation up to about 20Mbit/sec rates. Power Dissipation Considerations Supply current can be predicted by Equation1: The 12mA quantity represents the operating DC current of the EL6201. This is also the current drawn from the supply during output disable. The IOUT quantity is based on a typical 50% duty cycle of output pull-up current, and the fact that the peak-to-peak output current is about twice the pull- up or pull-down currents. The VS quantity is due to CV 2F losses within the circuit, and the 8*10-12 quantity represents internal capacitances that must be slewed at the operating frequency. The 1.6V offset is a curve fit to measured data. The internal die temperature operating range is -40°C to +125°C. Internal temperature is equal to the ambient temperature plus power dissipated times the thermal resistance of the mounted package, θ JA. For a mounted MSOP-8 package, θ JA is 206°C/W. The SOT-23 package has a θ JA of 256°C/W. Power-Down with the SOT-23 Package The supply current of the EL6201 is low enough so that a logic output can simply provide the supply current of the part and effect power-down. This is most useful using the EL6201 in the SOT-23 package, which has no enable pin. RF Applications The EL6201 can easily interface to reactive loads, and is adequate as a short-range modulated transmitter. Remembering that the output circuitry looks like current sources, impedance matching becomes a matter of transforming the load impedance to an appropriate load line for the EL6201. Also important is maintaining correct DC bias voltage on the output. Since the output will have a net DC current, capacitor coupling would allow the DC level to drift toward a supply rail and increase output harmonic products. In cases where such harmonics are important, Figure 25 shows coupling the EL6201 output to a 50 Ω load: Digital Clock Applications The EL6201 can be used as a digital clock source. If unloaded, the output will simply traverse ground to VS. It is recommended that the VS supply be isolated from the main digital supply with an inductor or resistor, whose value is chosen to drop about 250mV. In this way logic noise can be isolated by the series component and the EL6201 local bypass. The rise- and fall-time of the output will be equal to VS/(CLOAD*IOUTP-P/2). The output current should be the smallest that can set an output rise-time, in the interest of lowest dissipation. The jitter is about 0.7% of period, RMS. - + PIN VREF FIGURE 24. RFREQ AND RAMP PIN INTERFACE I S 12mA I OUTp-p + 4V S ( - 1.6V ) FREQ 8 10 -12 × × × + ------------------------------------------------------------------------------------------------- = (EQ. 1) IOUT EL6201 LCHOKE C1 C2 R1 VS R2 L 0.001µF 50 Ω LOAD FIGURE 25. TUNED INTERFACE TO 50 Ω LEAD EL6201 |
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