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Micrel, Inc.
RO2
MICRF220
C
R
V BIAS
RO1
C
Figure 5. Reference Oscillator Circuit
Reference oscillator crystal frequency can be calculated
according to Equation 3. For example, if f RF = 433.92MHz,
f REF = 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.
Figure 6. Data Out Pin with No Squelch (V SQ = V DD )
RF Input Frequency (MHz)
315.0
390.0
418.0
433.92
Reference Frequency (MHz)
9.81713*
12.15446
13.02708
13.52313*
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
*Empirically derived, slightly different from Equation 3.
Table 4. Reference Frequency Examples
SQ pin is tied low, the activity on DO pin is much reduced
as shown in Figure 7.
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 7. Data Out Pin with Squelch (V SQ = 0V)
August 2010
11
M9999-082610-A
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