Texas Instruments | CC1310 Integrated Passive Component for 779-928 MHz (Rev. A) | Application notes | Texas Instruments CC1310 Integrated Passive Component for 779-928 MHz (Rev. A) Application notes

Texas Instruments CC1310 Integrated Passive Component for 779-928 MHz (Rev. A) Application notes
Application Report
SWRA524A – September 2016 – Revised December 2016
CC1310 Integrated Passive Component for 779-928 MHz
Richard Wallace
ABSTRACT
This application report describes the IPC that has been specifically designed for the CC1310 operating in
the 779 MHz (China), 868 MHz (Europe), 915 MHz (US) and 920 MHz ISM bands.
1
2
3
4
Contents
Introduction ................................................................................................................... 2
Reference Designs Available............................................................................................... 3
2.1
Schematic for the Discrete Reference Design .................................................................. 3
2.2
CC1310 IPC Reference Design ................................................................................... 3
2.3
Johanson Technology IPC Measurement Results ............................................................. 8
2.4
Murata IPC Measurement Results .............................................................................. 11
Conclusion .................................................................................................................. 13
References .................................................................................................................. 13
Trademarks
All trademarks are the property of their respective owners.
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1
Introduction
1
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Introduction
With the CC1310 matched integrated passive component (IPC), the component count is significantly
reduced as shown in Figure 1, while still obtaining high radio performance.
The existing discrete solution requires 11 passive components for the RF Front End filter. The IPC
replaces these 11 discrete components with a single component as illustrated in Figure 2.
Measurement results of the IPC reference design are documented in this report.
Part number for the Johanson Technology (JTI) IPC is 0850BM14E0016, which is available from
Johanson Technology [2] or their distributors.
The part number for the Murata IPC is LFB18868MBG9E212. This part is available from Murata or their
distributors [8].
The size for the matched balun filter component is only 1.6 mm x 0.80 mm. It is highly recommended for
compact designs and designs that are sensitive to production assembly pick-and-place costs.
All measurement results presented in this document are based on the CC1310IPC4XD-7793 EM Rev 1.0
Reference Design [6], shown in Figure 1.
Figure 1. CC1310 IPC 4XD EM Reference Design
2
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2
Reference Designs Available
The CC1310 [1] has a highly configurable RF front end. The CC1310 radio ports can be configured as
differential or as single-ended. For best performance the differential configuration provides optimum link
budget than the single-ended configuration.
2.1
Schematic for the Discrete Reference Design
The passive network connected to the RF_P and RF_N ports in the standard differential discrete
reference design can be replaced by the IPC component, as shown in Figure 2. The discrete components
shown within the green marking in Figure 2 are the components that can be replaced the IPC.
Figure 2. Discrete Reference Design for CC1310EM-4XD-7793
2.2
CC1310 IPC Reference Design
By using the Johanson or Murata IPC, 11 passive components are replaced in the standard differential
discrete reference design by a single component. The IPC is 1.6 mm x 0.8 mm with 6 pad terminals. As
shown in Figure 4, terminals 2, 3 and 4, are connected directly to the CC1310. Terminal 1 is connected
towards the antenna and terminal 5 and 6 are GND connections.
Terminal Configuration
No
Function
1
Unbalanced P o rt
2
RX/TX
3
Balanced Port
RF_N
No
Function
4
Balanced Port
RF_P
5
GND
6
GND
e d c
f g h
Figure 3. Pinout for CC1310
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Reference Designs Available
2.2.1
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CC1310 IPC Reference Design
As shown in Figure 4, the schematic is simplified by using the IPC. Note that the DC blocking capacitor is
not embedded into the IPC; this is still required if there is DC at the antenna or SMA port. In addition to
the DC blocking function, C15 and C16 footprints are used to switch between the integrated antenna and
the SMA connector. To connect to the integrated antenna: C16: 100 pF and C15: DNM. To connect to the
SMA connector: C16: DNM and C15: 100 pF.
Components L15, R2 and L16 are a part of the antenna matching network for the integrated PCB helix
antenna used on the EM. The unbalanced port impedance (terminal 1) from the IPC, pin 1 is 50 Ω.
Figure 4. Schematic for the 4-Layer Reference Design
4
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2.2.2
Component Placement
As shown in Figure 5, with the CC1310 4x4 QFN package and the IPC, the overall footprint area for all the
required components is less than 0.94 mm2.
Figure 5. Component Placement for the 4-Layer Reference Design
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Reference Designs Available
2.2.3
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Layout
The layout greatly influences the RF performance. TI recommends copying our reference design as
closely as possible. The placement distance from the IPC to the CC1310 is critical. The IPC reference
design has a distance of 0.55 mm from the balanced pads to the CC1310 RF_N and RF_P pads. This
distance should be maintained, otherwise, there will be a phase alteration that can affect the filter
characteristics. If the filter characteristics are altered too much then the output power can be reduced and
increased third harmonic level.
The layout around the IPC should be copied, in particular the distance from the IPC to CC1310 (the TRX
routing, line widths, and the GND via placements). For the exact footprint and dimensions, see Figure 6.
Figure 6. Recommended Layout and Footprint of IPC to the CC1310
In the event that the reference design cannot be copied, the routing from the RF pins RF_P and RF_N
must be symmetrical to the IPC. The length of the tracks should be kept to a minimum and preferably the
same length that is used in the reference design. If this routing is not symmetrical, the output power will be
reduced and the harmonics will increase.
All component ground pads should have their own ground via, which should be positioned as close as
possible to the ground pad. When positioning the ground vias for the component pad grounds, it is
important to try to keep the return path loop to ground as little as possible in order to prevent unnecessary
radiated emissions.
A 4-layer PCB is strongly recommended. The four layers of the reference design are shown in Figure 7,
Figure 8, Figure 9, and Figure 10. On the layer directly underneath the RF network, it is important to have
a solid ground plane and to avoid any routing, as shown in Figure 8. The power tracks must always be
routed to the decoupling capacitor first, then from the decoupling capacitor to the pad of the CC1310.
6
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2.2.3.1
4 Layer
Figure 7. Layer 1 Layout of the 4-Layer IPC Reference
Design
Figure 8. Layer 2 Layout of the 4-Layer IPC Reference
Design
Figure 9. Layer 3 Layout of the 4-Layer IPC Reference
Design
Figure 10. Layer 4 Layout of the 4-Layer IPC Reference
Design
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Reference Designs Available
2.3
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Johanson Technology IPC Measurement Results
All results presented in this section are based on measurements performed with CC1310IPC EM
reference design. A minimum of five units were measured in order to obtain the average result that is
presented in this report. The devices were tested at room temperature and the voltage was set to 3.0 V,
unless otherwise specified. All values are in dBm, if not otherwise specified.
2.3.1
Current Consumption
Rx current consumption with 802.15.4g, 868 MHz, 50 kbps, DC-DC (3.6 V) setting:
Tx current consumption at 10 dBm, 868 MHz, DC-DC (3.6 V) setting:
Tx current consumption with BOOST mode, 868 MHz, DC-DC (3.6 V) setting:
2.3.2
5.4 mA
15.8 mA
32.9 mA
Rx Measurements
The average Rx sensitivity for the 802.15.14g, 50 kbps setting at 868 MHz is –108.0 dBm. For the same
settings at 915 MHz, the average sensitivity is –107.2 dBm.
Figure 11 shows the packet error rate (PER) against signal level measurement with the 802.15.4g settings
at 50 kbps, 868 MHz and with the DC-DC activated.
Figure 12 shows the received signal strength indicator (RSSI) error against signal level measurement with
the 802.15.4g settings at 50 kbps, 868 MHz and with the DC/DC activated.
100
10
Min Typ Cond
Avg Typ Cond
Max Typ Cond
Limit High
Limit Low
80
6
70
4
60
50
40
2
0
-2
30
-4
20
-6
10
-8
0
-120
-100
-80
-40
-60
Input level [dBm]
-20
0
20
-10
-120
-100
-80
-60
-40
-20
0
20
Input level [dBm]
Figure 11. PER vs Level Measurement, 802.15.4g, 50
kbps, 868 MHz
2.3.3
Min Typ Cond
Avg Typ Cond
Max Typ Cond
Limit High
Limit Low
8
RSSI-Input level [dB]
Packet error rate [%]
90
Figure 12. RSSI Error Level, 802.15.4g, 50 kbps, 868 MHz
Tx Measurements
The output power was set to maximum with the BOOST mode. For 868 MHz, the average output power is
14.3 dBm. For 915 MHz, the average output power is 13.7 dBm.
The harmonic levels are shown in Figure 13, Figure 14, Figure 15, and Figure 16.
For 868 MHz (EN 300 200), all the harmonic levels are under the regulatory limits of -30 dBm with good
margin.
8
CC1310 Integrated Passive Component for 779-928 MHz
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For 915 MHz (FCC 15.247), the maximum output power allowed is +30 dBm with frequency hopping. The
second harmonic level requirement is -20 dBc and passes with good margin. The third, fourth and fifth
harmonic requirements are -41.2 dBm. In order to fulfill these requirements, the duty cycle correction
factor must be used for designs that require to perform conducted tests. If there is an integrated antenna
and conducted tests are not required, then the correction factor can be reduced due to the antenna filter
characteristics. For more information on the duty cycling correction factor, see Section 2.4.4.
-30
-25
-35
-30
-35
-40
3rd harmonic [dBm]
2nd harmonic [dBm]
For 915 MHz (FCC 15.249), the harmonic level requirement is -41.2 dBm with a maximum output of -1.2
dBm EIRP for non-frequency hopping (50 V/m at 3m is equivalent to -1.2 dBm output power). Duty cycling
correction factor should not be required.
-45
-50
-40
-45
-50
-55
Min Typ Cond
Avg Typ Cond
Max Typ Cond
Limit High
Limit Low
-60
8.6
8.7
8.8
8.9
9
9.1
9.2
Frequency [Hz]
9.3
x 108
-60
Figure 13. Second Harmonic Level vs Frequency
8.7
8.8
8.9
9
Frequency [Hz]
9.1
9.2
9.3
x 108
-30
Min Typ Cond
Avg Typ Cond
Max Typ Cond
Limit High
Limit Low
-35
-35
-40
Min Typ Cond
Avg Typ Cond
Max Typ Cond
Limit High
Limit Low
-40
5th harmonic [dBm]
4th harmonic [dBm]
8.6
Figure 14. Third Harmonic Level vs Frequency
-30
-45
-50
-55
-60
Min Typ Cond
Avg Typ Cond
Max Typ Cond
Limit High
Limit Low
-55
-45
-50
-55
8.6
8.7
8.8
8.9
9
Frequency [Hz]
9.1
9.2
9.3
x 108
Figure 15. Fourth Harmonic Level vs Frequency
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-60
8.6
8.7
8.8
8.9
9
Frequency [Hz]
9.1
9.2
9.3
x 108
Figure 16. Fifth Harmonic Level vs Frequency
CC1310 Integrated Passive Component for 779-928 MHz
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Reference Designs Available
2.3.4
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Tx ETSI EN 300 200 Compliance
The device with the lowest margins from the total number of units tested is presented here.
Figure 17. TX ETSI EN 300220 Mask Compliancy, 863 –
870 MHz
Figure 18. TX ETSI EN 300220 Mask Compliancy, 840 –
880 MHz
Power (dBm)
TX ETSI EN300220 Mod TC016 BOOST 868.3M DCDC ON 20160523 174038 EM=JYI E 2
VDD1=3.000 Temp=25C.csv
20
10
0
-10
-20
-30
-40
-50
-60
-70
-80
500
1000
1500
Frequency (MHz)
2000
2500
3000
2000
2500
3000
Margin (dB)
Spectrum OK
10
9
8
7
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
500
1000
1500
Frequency (MHz)
Figure 19. TX ETSI EN 300220 Mask Compliancy < 3 GHz
10
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2.4
Murata IPC Measurement Results
All results presented in this subsection are based on measurements performed with CC1310IPC EM
reference design. A minimum of five units have been measured to obtain an average result which is
presented in this report. The devices have been tested at room temperature and the voltage was set to
3.0 V unless otherwise specified. All values are in dBm if not otherwise specified.
2.4.1
Current Consumption
Rx current consumption with 802.15.4g, 868 MHz, 50 kbps, DC-DC (3.6 V) setting:
Tx current consumption at 10 dBm, 868 MHz, DC-DC (3.6 V) setting:
Tx current consumption with BOOST mode, 868 MHz, DC-DC (3.6 V) setting:
2.4.2
5.4 mA
14.5 mA
29.1 mA
Rx Measurements
The average Rx sensitivity for the 802.15.14 g, 50-kbps setting at 868 MHz is –109-1 dBm. For the same
settings at 915 MHz, the average sensitivity is –109.0 dBm.
Figure 20 shows the packet error rate (PER) against signal level measurement with 802.15.4 g settings at
50 kbps, 868 MHz, and with the DC-DC activated.
Figure 21 shows the received signal strength indicator (RSSI) error against the signal level measurement
with the 802.15.4 g settings at 50 kbps, 868 MHZ, and with the DC-DC activated.
Figure 20. PER vs Level Measurement, 802.15.4g, 50
kbps, 868 MHz
2.4.3
Figure 21. RSSI Error Level, 802.15.4g, 50 kbps, 868 MHz
Tx Measurements
The output power was set to maximum with the BOOST mode. For 868 MHz and 915 MHz, the average
output power is 14.1 dBm.
The harmonic levels can be seen in Figure 22, Figure 23, Figure 24, and Figure 25.
For 868 MHz (EN 300 200), all of the harmonic levels are under the regulatory limits of –30 dBm with
good margin.
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For 915 MHz (FCC 15.247), the maximum output power allowed is +30 dBm with frequency hopping. The
second harmonic level requirement is –20 dBc and passes with good margin. The third harmonic passes
with good margin. The fourth and fifth harmonic requirements are –41.2 dBm. To fulfill these requirements,
the duty-cycle correction factor must be used for designs that require to perform conducted tests. If there
is an integrated antenna and conducted tests are not required, then the correction factor can be reduced
due to the antenna filter characteristics. Refer to Section 2.4.4 for more information on the duty-cycling
correction factor.
For 915 MHz (FCC 15.249), the harmonic level requirement is –41.2 dBm with a maximum output of –1.2
dBm EIRP for non-frequency hopping (50 V/m at 3 m is equivalent to –1.2 dBm output power). Duty
cycling correction factor should not be required.
12
Figure 22. Second Harmonic Level vs Frequency
Figure 23. Third Harmonic Level vs Frequency
Figure 24. Fourth Harmonic Level vs Frequency
Figure 25. Fifth Harmonic Level vs Frequency
CC1310 Integrated Passive Component for 779-928 MHz
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2.4.4
Overview of Harmonic Emission Regulatory Requirements
Harmonic emission will depend on ground plane geometry, encapsulation, and so forth. Table 1 shows the
FCC- and ETSI limits. Above 1 GHz, FCC allows the radiation to be up to 20 dB above the limits given in
Table 1, if duty cycling is being used.
Table 1. ETSI and FCC Limits for Output Power and Harmonic Radiation
Output
Power
Limit
Harmonics
fc
Second
Third
Fourth
Fifth
Sixth
Seventh
Eighth
Ninth
FCC
15.249
50 V/m at 3m
-1.2 dBm
EIRP
54
dBµV/m
54
dBµV/m
54
dBµV/m
54
dBµV/m
54
dBµV/m
54
dBµV/m
54
dBµV/m
54
dBµV/m
FCC
15.247
30
dBc
20
dBc
54
dBµV/m
54
dBµV/m
54
dBµV/m
20
dBc
54
dBµV/m
54
dBµV/m
54
dBµV/m
ETSI
EN 300 220
-30
dBc
-30
dBc
-30
dBc
-30
dBc
-30
dBc
-30
dBc
-30
dBc
-30
dBc
-30
dBc
The programmed output power and size of the ground plane will affect the level of the harmonics and thus
determine the necessary duty cycling.
The allowed additional emission, or correction factor, is calculated based on maximum transmission time
during 100 ms. Equation 1 can be used to calculate the correction factor, where “t” is equal to maximum
transmission time during 100 ms. From Equation 1, it can be calculated that a maximum transmission time
of 50 ms, during 100 ms, will permit all radiation above 1 GHz to be 6 dB above the given limits.
CF
t ·
§
20 u log ¨
¸
100ms
©
¹
(1)
Even when an averaging detector is utilised, there is still a limit on emissions measured using a peak
detector function with a limit 20 dB above the average limit.
3
Conclusion
As an alternative to the traditional discrete reference designs, the IPC reference design can match the
performance of the discrete multi-layer inductor reference design with a lower component count (see [3],
[4], [5], and [6]).
For best-in-class RF performance; the discrete wire-wound inductor solution is still recommended but for
compact and lower component count solutions, the IPC reference designs should be considered. The
complete area for all the required components is less than 0.94 mm2 with the CC1310 4x4 mm QFN and
IPC.
4
References
1.
2.
3.
4.
5.
6.
7.
8.
CC1310 SimpleLink™ Ultralow Power Sub-1-GHz Wireless MCU Data Manual (SWRS181)
JTI contact information: http://www.johansontechnology.com/index.php
SimpleLink CC1310 4-Layer 4x4 Differential 779-930 MHz v1.0.0 Design Files (SWRC316)
SimpleLink CC1310 4-Layer 5x5 Differential 779-930 MHz v1.0.0 Design Files (SWRC315)
SimpleLink CC1310 4-Layer 7x7 Differential 779-930 MHz v1.0.1 Design Files (SWRC310)
SimpleLink CC1310 IPC 4-Layer 4x4 Differential 779-930 MHz v1.0.1 Design Files (SWRC327)
0850BM14E0016 Data Sheet
Murata contact information: www.murata.com
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Revision History
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Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Original (Septermber 2016) to A Revision .............................................................................................. Page
•
14
Added Section 2.4 ....................................................................................................................... 11
Revision History
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