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Micrel
Application Example
315MHz Receiver/Decoder Application
Figure 8 illustrates a typical application for the MICRF009
UHF Receiver IC. This receiver operates continuously (not
duty cycled) in sweep mode, and features 6-bit address
decoding and two output code bits.
MICRF009
Operation in this example is at 315MHz, and may be
customized by selection of the appropriate frequency
reference (Y1), and adjustment of the antenna length. The
value of C4 would also change if the optional input filter is
used. Changes from the 1kbps data rate may require a
change in the value of R1. A bill of materials accompanies
the schematic.
Figure 8. 315Mhz, 1.2kbps On-Off Keyed Receiver with Decoder
Sweep Mode
Bill of Materials
Item
Part Number
Manufacturer
Description
Qty
Vishay
Vishay
Vishay
C1, C5
C2
C3
C4
Y1
See Crystal App. Note
Vishay (1)
(1)
(1)
(1)
4.7 μ F ceramic or tantalum capacitor
0.1 μ F ceramic or tantalum capacitor
2.2 μ F ceramic or tantalum capacitor
8.2pF COG ceramic capacitor
9.81 ceramic resonator
2
1
1
1
1
Lumex
Vishay
D1
L1
R1
R2
U1
SSF-LX100LID
0603CS-47NX_BC
MICRF009
(2)
Coil Craft (5)
(1)
Micrel (3)
Red LED
47nH Inductor
68k, 1/4W, 5%
1k, 1/4W, 5%
UHF receiver
1
1
1
1
1
U2
HT-12D
Holtek
(4)
Logic decoder
1
Notes:
1.
2.
3.
4.
5.
Vishay tel: 203-268-6261
Lumex tel: 800-278-5666
Micrel Semiconductor tel: 408-944-0800
Holtek tel: 408-894-9046
Coil Craft tel: 847-639-2361
January 18, 2005
13
M9999-011805
(408) 955-1690
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