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MICRF220AYQS Datasheet(PDF) 11 Page - Micrel Semiconductor |
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MICRF220AYQS Datasheet(HTML) 11 Page - Micrel Semiconductor |
11 / 18 page Micrel, Inc. MICRF220 August 2010 11 M9999-082610-A V BIAS RO2 R RO1 C C Figure 5. Reference Oscillator Circuit Reference oscillator crystal frequency can be calculated according to Equation 3. For example, if fRF = 433.92MHz, fREF = 13.52313MHz. Table 4 lists the values of reference frequencies at different popular RF frequencies. To operate the MICRF220 with minimum offset, use proper loading capacitance recommended by the crystal manufacturer. RF Input Frequency (MHz) Reference Frequency (MHz) 315.0 9.81713* 390.0 12.15446 418.0 13.02708 433.92 13.52313* *Empirically derived, slightly different from Equation 3. Table 4. Reference Frequency Examples Squelch Operation When squelch function is enabled by tying the SQ pin low, the chip will monitor incoming pulse width before allowing activity on DO pin. The pulse width is set by SEL1 and SEL0 pins as shown in Table 5, and is inversely proportional to frequency. When there is no input signal and squelch is not enabled (SQ pin left floating), voltage on DO chatters due to random noise as shown in Figure 6. If SQ pin is tied low, the activity on DO pin is much reduced as shown in Figure 7. Figure 6. Data Out Pin with No Squelch (VSQ = VDD) When squelch function is enabled by tying the SQ pin low, the chip will monitor incoming pulse width before allowing activity on DO pin. The pulse width is set by SEL1 and SEL0 pins as shown in Table 5, and is inversely proportional to frequency. When there is no input signal and squelch is not enabled (SQ pin left floating), voltage on DO chatters due to random noise as shown in Figure 6. If SQ pin is tied low, the activity on DO pin is much reduced as shown in Figure 7. Figure 7. Data Out Pin with Squelch (VSQ = 0V) |
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