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MICRF220AYQS Datasheet(PDF) 11 Page - Micrel Semiconductor

Part # MICRF220AYQS
Description  300MHz to 450MHz, 3.3V ASK/OOK Receiver with RSSI and Squelch
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Manufacturer  MICREL [Micrel Semiconductor]
Direct Link  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MICRF220AYQS Datasheet(HTML) 11 Page - Micrel Semiconductor

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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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