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Table 6-2. Bill of Materials for the Application Circuit In
ITEM
(3)
C1
10 pF, 5%, NP0, 0402
(3)
C3
5.6 pF, 5%, NP0, 0402
C4
22 pF, 5%, NP0, 0402
C5
12 pF, 5%, NP0, 0402
C6
220 nF, 10%, X7R, 0603
C7
8.2 nF, 10%, X7R, 0402
C8
2.2 nF, 10%, X7R, 0402
C60
220 pF, 5%, NP0, 0402
(3)
L1
33 nH, 5%, 0402
(3)
L2
22 nH, 5%, 0402
R1
82 kΩ, 1%, 0402
R2
1.5 kΩ, 5%, 0402
R3
4.7 kΩ, 5%, 0402
R10
14.7456 MHz crystal,
XTAL
(1) The PLL loop filter component values in
(2) The SmartRF Studio software provides component values for other data rates using the equations in
(3) Items shaded vary for different frequencies. For 433 MHz, 12.5 kHz channel, a loop filter with lower bandwidth is used to improve
adjacent and alternate channel rejection.
In the CC1020EMX reference design (CC1020EMX), LQG15HS series inductors from Murata have been
used. The switch is SW-456 from M/A-COM.
The LC filter in
Figure 6-1
and the spurious emissions in the TX path. An alternative is to insert the LC filter between the antenna
and the T/R switch as shown in
The filter will reduce the emission of harmonics and the spurious emissions in the TX path as well as
increase the receiver selectivity. The sensitivity will be slightly reduced due to the insertion loss of the LC
filter.
6.2
Design Requirements
6.2.1 Input and Output Matching
L1 and C1 are the input match for the receiver. L1 is also a DC choke for biasing. L2 and C3 are used to
match the transmitter to 50 Ω. Internal circuitry makes it possible to connect the input and output together
and match the CC1020 to 50 Ω in both RX and TX mode. However, it is recommended to use an external
T/R switch for optimum performance. See
network are easily found using the SmartRF Studio software.
6.2.2 Bias Resistor
The precision bias resistor R1 is used to set an accurate bias current.
6.2.3 PLL Loop Filter
The loop filter consists of two resistors (R2 and R3) and three capacitors (C6 through C8). C7 and C8 may
be omitted in applications where high loop bandwidth is desired. The values shown in
used for data rates up to 4.8 kBaud. Component values for higher data rates are easily found using the
SmartRF Studio software.
Copyright © 2006–2015, Texas Instruments Incorporated
433 MHz
82 Ω, 5%, 0402
16 pF load
Table 6-2
(R2, R3, C6-C8) can be used for data rates up to 4.8 kBaud.
is inserted in the TX path only. The filter will reduce the emission of harmonics
Figure
6-2.
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SWRS046H – NOVEMBER 2006 – REVISED MARCH 2015
868 MHz
47 pF, 5%, NP0, 0402
10 pF, 5%, NP0, 0402
22 pF, 5%, NP0, 0402
12 pF, 5%, NP0, 0402
100 nF, 10%, X7R, 0603
3.9 nF, 10%, X7R, 0402
1.0 nF, 10%, X7R, 0402
220 pF, 5%, NP0, 0402
82 nH, 5%, 0402
3.6 nH, 5%, 0402
82 kΩ, 1%, 0402
2.2 kΩ, 5%, 0402
6.8 kΩ, 5%, 0402
82 Ω, 5%, 0402
14.7456 MHz crystal,
16 pF load
Section 5.11
for details. Component values for the matching
Applications, Implementation, and Layout
CC1020
(1) (2)
Figure 6-1
915 MHz
47 pF, 5%, NP0, 0402
10 pF, 5%, NP0, 0402
22 pF, 5%, NP0, 0402
12 pF, 5%, NP0, 0402
100 nF, 10%, X7R, 0603
3.9 nF, 10%, X7R, 0402
1.0 nF, 10%, X7R, 0402
220 pF, 5%, NP0, 0402
82 nH, 5%, 0402
3.6 nH, 5%, 0402
82 kΩ, 1%, 0402
2.2 kΩ, 5%, 0402
6.8 kΩ, 5%, 0402
82 Ω, 5%, 0402
14.7456 MHz crystal,
16 pF load
Section
5.12.2.
Table 6-2
CC1020
can be
85
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