MICRF002BM データシートの表示（PDF） - Micrel
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MICRF002BM Datasheet PDF : 16 Pages
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MICRF002/RF022
Applications Example
315MHz Receiver/Decoder Application
Figure 7a 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.
Operation in this example is at 315MHz, and may be custom-
ized 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.
Micrel
+5V
Supply
Input
Optional Filter
8.2pF, 16.6nH
pcb foil inductor
1in of 30mil trace
0.4 monopole
antenna (11.6in)
C4
L1
U1 MICRF002
SSEELL00
SWEN
VSSRF REFOSC
VSSRF
SEL1
ANT
CAGC
C1
4.7µF
C2
2.2µF
VDDRF
VDDBB
CTH
NC
WAKEB
SHUT
DO
VSSBB
RF Baseband
(Analog) (Digital)
Ground Ground
4.8970MHz
Y1
4.7µF
6-bit
address
U2 HT-12D
A0 VDD
R2
A1
VT
1k
A2 OSC1
R1
A3 OSC2
A4
DIN 68k
A5
D11
A6
D10
A7
D9
VSS D8
Figure 7a. 315MHz, 1kbps On-Off Keyed Receiver/Decoder
Code Bit 0
Code Bit 1
Item
U1
U2
CR1
D1
R1
R2
C1
C3
C2
C4
Part Number
MICRF002
HT-12D
CSA6.00MG
SSF-LX100LID
Manufacturer
Micrel
Holtek
Murata
Lumex
Vishay
Vishay
Vishay
Vishay
Vishay
Description
UHF receiver
logic decoder
6.00MHz ceramic resonator
red LED
68k 1/4W 5%
1k 1/4W 5%
4.7µF dipped tantalum capacitor
4.7µF dipped tantalum capacitor
2.2µF dipped tantalum capacitor
8.2pF COG ceramic capacitor
Figure 7b. Bill of Material
Vendor
Vishay
Holtek
Lumex
Murata
Telephone
(203) 268-6261
(408) 894-9046
(800) 278-5666
(800) 241-6574
FAX
—
(408) 894-0838
(847) 359-8904
(770) 436-3030
Figure 7c. Component Vendors
MICRF002/RF022
14
March 2003
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