RF83 Datasheet, PDF (16/22 Pages) List of Unclassifed Manufacturers – 300~440MHz ASK/OOK Receiver

RF83//RF83C/RF83L/RF83CL ASK/OOK Receiver V2.0
14. Additional Applications Information
In addition to the basic operation of the RF83 the following enhancements can be made. In particular it is
strongly recommended that the antenna impedance is matched to the input of the IC.
14.1. Antenna Impedance Matching
As shown in table 4 the antenna pin input impedance is frequency dependant.
The ANT pin can be matched to 50 Ohms with an L-type circuit. That is, a shunt inductor from the
RF input to ground and another in series from the RF input to the antenna pin.
Inductor values may be different from table depending on PCB material, PCB thickness, ground
configuration, and how long the traces are in the layout. Values shown were characterized for a
0.031 thickness, FR4 board, solid ground plane on bottom layer, and very short traces. MuRata and
Coilcraft wire wound 0603 or 0805 surface mount inductors were tested, however any wire
wound inductor with high SRF (self resonance frequency) should do the job.
Frequency
(MHz)
300
305
310
315
320
325
330
335
340
345
350
355
360
365
370
375
380
385
390
395
400
405
410
Z_IN ( )
Z₁₁
12-j166
12-j165
12-j163
13-j162
12-j160
12-j157
12-j155
12-j152
11—j150
11-j148
11-j145
11-j143
11-j141
11-j139
10-j137
10-j135
10-j133
10-j131
10-j130
10-j128
10-j126
10-j124
10-j122
S₁₁
0.803-j0.529
0.800-j0.530
0.796-j0.536
0.791-j0.536
0.789-j0.543
0.782-j0.550
0.778-j0.556
0.770-j0.564
0.767-j0.572
0.762-j0.578
0.753-j0.586
0.748-j0.592
0.742-j0.597
0.735-j0.603
0.732-j0.612
0.725-j0.619
0.718-j0.625
0.711-j0.631
0.707-j0.634
0.700-j0.641
0.692-j0.647
0.684-j0.653
0.675-j0.660
L_SHUNT(nH) L_SERIES(nH)
15
72
15
72
15
72
15
72
15
68
12
68
12
68
12
68
15
56
15
56
12
56
12
56
10
56
10
56
12
47
12
47
10
47
10
47
10
43
10
43
10
43
10
39
10
39
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