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參數(shù)資料
| 型號： | CC113LRTKT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, PQCC20 |
| 封裝： | 4 X 4 MM, GREEN, PLASTIC, VQFN-20 |
| 文件頁數(shù)： | 8/75頁 |
| 文件大?。?/td> | 1454K |
| 代理商： | CC113LRTKT |
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CC113L
SWRS108A
Page 16 of 68
7.2.1
Balun and RF Matching (low cost
application circuit)
The components between the RF_N/RF_P
pins and the point where the two signals are
joined together (C131, L132, C122, L122, see
Figure 8) form a balun that converts single-
ended
RF
signal
at
the
antenna
to
a
differential RF signal on CC113L. C124 is
needed for DC blocking.
The balun components also matches the
CC113L input impedance to a 50
source.
C126 provides DC blocking and is only
needed if there is a DC path in the antenna.
Antenna
(50 Ohm)
D
ig
it
a
l
In
te
fa
c
e
1.8 V - 3.6 V
power supply
6
G
D
O
0
7
C
S
n
8
X
O
S
C
_
Q
1
9
A
V
D
1
0
X
O
S
C
_
Q
2
S
I
2
0
G
N
D
1
9
D
G
U
A
R
D
1
8
R
B
IA
S
1
7
G
N
D
1
6
1 SCLK
2 SO
(GDO1)
3 GDO2
4 DVDD
5 DCOUPL
AVDD 15
AVDD 14
RF_N 13
RF_P 12
AVDD 11
XTAL
C126
R171
C81
C101
C51
CSn
GDO0 (optional)
GDO2 (optional)
SCLK
SI
CC113L
DIE ATTACH PAD:
C131
C122
L122
L132
C124
SO (GDO1)
Figure 8: Low Cost Application Circuit and Evaluation Circuit 315/433/868/915 MHz
Component
Value at 315 MHz
Value at 433 MHz
Value at 868/915 MHz
C124
220 pF
100 pF
C122
6.8 pF
3.9 pF
2.2 pF
C126
220 pF
100 pF
C131
6.8 pF
3.9 pF
2.2 pF
L122
33 nH
27 nH
12 nH
L132
33 nH
27 nH
12 nH
Table 13: External Components (low cost application circuit)
7.2.2
Balun
and
RF
Matching
(characterization circuit)
The components between the RF_N/RF_P
pins and the point where the two signals are
joined together (C131, C122, L122, and L132
in Figure 9 and L121, L131, C121, L122,
C131, C122, and L132 in Figure 10) form a
balun that converts single-ended RF signal at
the antenna to a differential RF signal on
CC113L. C124 is needed for DC blocking.
The balun components also matches the
CC113L input impedance to a 50
source.
C126 provides DC blocking and is only
needed if there is a DC path in the antenna.
Note that the 315/433 MHz design [1] use
Murata LQG15 multi-layer inductors while the
868/915 MHz design [2] use Murata LQW15
wire-wound inductors.
L123, L124, and C123 ( plus C125 in Figure 9)
form an LC low-pass filter. This filter is not
required for an RX-only design and can be
omitted.
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