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Micrel Inc.
Application Information
Figure 5 – QR221BPF Application Example, 915.0 MHz
MICRF221
The MICRF221 receiver can be fully tested by using
one of the many evaluation boards designed at Micrel
Table 2 shows the most used frequency values.
for this device. As an entry level, the QR221BPF
(Figure 5) offers a good start for most applications. It
has a connector for a whip antenna (ANT1), a band-
pass filter front end (L1 & C8) as a pre-selector filter,
and a matching network (C3 & L2). It also includes the
minimum components required to make the device
Freq (MHz)
868.35
915.0
916.5
C8 (pF)
2.7
2.7
2.7
L1(nH)
12
11
11
work, which are: a crystal, C AGC , and C TH capacitors.
An RF connector (J2) can be used instead of the whip
antenna when tests require an RF signal generator.
Figure 5 shows the entire schematic for 915.0MHz.
Other frequencies can be used. The values needed
for the various components are listed in the tables
below.
L1 and C8 form the pass-band filter front end. Its
purpose is to attenuate undesired outside band noise
which reduces the receiver performance. It is
calculated by the parallel resonance equation
f = 1/(2×PI×(SQRT L1×C8))
Table 2. Band-Pass-Filter Front-End Values
There is no need for the band-pass filter front end in
applications where it is proven that the outside band
noise does not cause a problem. The MICRF221
receiver incorporates image reject mixers that improve
the selectivity and rejection of outside band noise
significantly.
October 2008
12
M9999-100108
(408) 955-1690
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