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Micrel, Inc.
Applications Example
315MHz Receiver/Decoder Application
Figure 7 illustrates a typical application for the MICRF002
UHF Receiver IC. This receiver operates continuously (not
duty cycled) in sweep mode, and features 6-bit address
decoding and two output code bits.
MICRF002/RF022
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 1kb/s data rate may require a
change in the value of R1. A bill of materials accompanies
the schematic.
address U2 HT-12D
+5V
Supply
Input
Optional Filter
8.2pF, 16.6nH
pcb foil inductor
1in of 30mil trace
0.4 λ monopole
antenna (11.6in)
C4
L1
C1
4.7μF
C2
2.2μF
U1 MICRF002
SEL0 SWEN
VSSRF REFOSC
VSSRF SEL1
ANT CAGC
VDDRF WAKEB
VDDBB SHUT
CTH
DO
NC
VSSBB
4.8970MHz
Y1
4.7μF
6-bit
A0 VDD
A1 VT
A2 OSC1
A3 OSC2
A4 DIN
A5 D11
A6
D10
A7
D9
R2
1k
R1
68k
Code Bit 0
Code Bit 1
RF Baseband
(Analog) (Digital)
Ground Ground
VSS
D8
Figure 7. 315MHz, 1kbps On-Off Keyed Recwiver/Decoder
Bill of Materials
Vishay
Vishay
Vishay
Vishay
Murata
Lumex
Vishay
Item
C1
C2
C3
C4
CR1
D1
R1
R2
U1
Part Number
CSA6.00MG
SSF-LX100LID
MICRF002
Manufacturer
(1)
(1)
(1)
(1)
(2)
(3)
(1)
Micrel, Inc. (4)
Description
4.7μF, Dipped Tantalum Capacitor
2.2μF, Dipped Tantalum Capacitor
4.7μF, Dipped Tantalum Capacitor
8.2pF, COG Ceramic Capacitor
6.00MHz, Ceramic Resonator
RED LED
68k, 1/4W, 5%
1k, 1/4W, 5%
300-440MHz QwikRadio ? ASK Receiver
Qty.
1
1
1
1
1
1
1
1
1
U2
HT-12D
Holtek
(5)
Logic Decoder
1
Notes:
1. Vishay Tel: (203) 268-6261
2. Murata Tel: (800) 241-6574, Fx: (770) 436-3030
3. Lumex Tel: (800) 278-5666, Fx: (847) 359-8904
5. Micrel, Inc.: (408) 944-0800
5. Holtek Tel: (408) 894-9046, Fx: (408) 894-0838
July 2008
14
M9999-070808
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