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MC13110A Datasheet(PDF) 24 Page - Motorola, Inc |
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MC13110A Datasheet(HTML) 24 Page - Motorola, Inc |
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24 / 68 page  MC13110A/B MC13111A/B 24 MOTOROLA ANALOG IC DEVICE DATA First Local Oscillator The 1st LO is a multi–vibrator oscillator. The tank circuit is composed of a parallel external capacitance and inductance, internal programmable capacitor matrix, and internal varactor. The local oscillator requires a voltage controlled input to the internal varactor and an external loop filter driven by on–board phase–lock control loop (PLL). The 1st LO internal component values have a tolerance of ±15%. A typical dc bias level on the LO Input and LO Output is 0.45 Vdc. The temperature coefficient of the varactor is +0.08%/ °C. The curve in Figure 33 is the varactor control voltage range as it relates to varactor capacitance. It represents the expected internal capacitance for a given control voltage (VcapCtrl) of the MC13110A/B and MC13111A/B. Figure 32 shows a representative schematic of the first LO function. LO1 In LO1 Out Vcap Ctrl Programmable Internal Capacitor 1st LO Varactor Varactor Cext Lext Figure 32. First Local Oscillator Schematic To select the proper Lext and Cext we can do the following analysis. From Figure 34 it is observed that an inductor will have a significant affect on first LO performance, especially over frequency. The overall minimum Q required for first LO to function as it relates to the LO frequency is also given in Figure 34. Choose an inductor value, say 470 nH. From Figure 34, the minimum operating Q is approximately 25. From the following equation: Q Coil = Rp/X Coil where: Rp = parallel equivalent impedance (Figure 35). Cext can be determined as follows: f LO + 1 2 p L extCext where: Lext = external inductance, Cext = external capacitance. Figure 34 clearly indicates that for lower coil values, higher quality factors (Q) are required for the first LO to function properly. Also, lower LO frequencies need higher Q’s. In Figure 35 the internal programmable capacitor selection relative to the first LO frequency and the parallel impedance is shown. This information will help the user to decide what inductor (Lext) to choose for best performance in terms of Q. Refer to the Auxiliary Register in the Serial Interface Section for further discussion on LO programmability. |
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