Texas Instruments | DN039 -- IPC for 868/915 MHz operation with the CC112x, CC117x and CC12xx | Application notes | Texas Instruments DN039 -- IPC for 868/915 MHz operation with the CC112x, CC117x and CC12xx Application notes

Texas Instruments DN039 -- IPC for 868/915 MHz operation with the CC112x, CC117x and CC12xx Application notes
Design Note DN039
Matched Integrated Passive Component for 868 / 915 MHz operation with
the CC112x, CC117x & CC12xx high performance radio series
By Richard Wallace
Keywords
• Single Matched Integrated Passive
Component
• Optimized for compact designs
• 868 and 915 MHz ISM Bands
• Dual source IPC with common footprint
1
• CC112x, CC117x & CC12xx
• Murata (Partnr: LFD21868MMF1D386)
• JTI (Partnr: 0900PC15J0013)
Introduction
With the Matched Integrated Passive
Component (IPC); the component count is
significantly reduced whilst still obtaining
high radio performance.
This document describes the IPC that has
been specifically designed for the CC112x,
CC117x and CC12xx family of ICs
operating in the 868 and 915 MHz ISM
bands.
The existing discrete solution requires 13
components for the RF Front End filter as
illustrated in Figure 2. The IPC replaces
these 13 discrete components with a
single component as can be seen in
Figure 3.
Test results of the discrete solution are
presented with both the wire-wound
inductor solution and with multi-layer
inductor solution on the 4-layer discrete
reference design.
Results of the IPC reference designs are
presented with the standard 4-layer ref
design [7] and with a 2-layer reference
design [8]. All the reference designs
performance are compared and discussed
in this document.
Part number for the Murata IPC is
LFD21868MMF1D386 and the part
number from Johanson Technology (JTI)
is 0900PC15J0013; these are available
directly from Murata [5] or JTI [6] or their
distributors.
The size for the matched balun filter
component is only 2.0 mm x 1.25 mm (EIA
0805, Metric 2012) therefore it is highly
recommended for compact designs and
designs which are sensitive to production
assembly pick-and-place costs.
All measurement results presented in this
document are based on measurements
performed on the CC112x IPC EM Rev 1.0
Reference Designs; 4-layer [7] as shown in
Figure 1 and 2-layer [8],
Since the CC112x and CC117x have the
same RF section as the CC12xx; the IPC
part can be used with the CC12xx family
series as well.
Figure 1. CC112x & CC117x IPC EM Reference Design
SWRA407
Page 1 of 20
Design Note DN039
Table of Contents
KEYWORDS.............................................................................................................................. 1
1
INTRODUCTION ............................................................................................................. 1
2
ABBREVIATIONS ........................................................................................................... 3
3
REFERENCE DESIGNS AVAILABLE ............................................................................ 4
3.1
DISCRETE REFERENCE DESIGN .................................................................................. 4
3.2
IPC REFERENCE DESIGNS ......................................................................................... 5
3.2.1
Schematic .......................................................................................................................... 5
3.2.2
Component Placement ...................................................................................................... 6
3.2.3
Layout ............................................................................................................................... 6
3.2.3.1 2-Layer.......................................................................................................................... 7
3.2.3.2 4-Layer.......................................................................................................................... 8
3.3
MEASUREMENT RESULTS ......................................................................................... 10
3.3.1
Sensitivity (1.2kbps data rate) ........................................................................................ 10
3.3.1.1 WW-Inductor Discrete Reference Design Based on 4-Layer PCB ............................. 10
3.3.1.2 ML-Inductor Discrete Reference Design Based on 4-Layer PCB .............................. 10
3.3.1.3 JTI IPC Reference Design Based on 4-Layer PCB ..................................................... 10
3.3.1.4 Murata IPC Reference Design Based on 4-Layer PCB ............................................... 11
3.3.1.5 Murata IPC Reference Design Based on 2-Layer PCB ............................................... 11
3.3.1.6 Summary of Sensitivity Measurements of the Various Reference Designs................. 11
3.3.2
Output Power and Harmonics (Max power setting) ....................................................... 12
3.3.2.1 WW-Inductor Discrete Reference Design Based on 4-Layer PCB ............................. 12
3.3.2.2 ML-Inductor Discrete Reference Design Based on 4-Layer PCB .............................. 13
3.3.2.3 JTI IPC Reference Design Based on 4-Layer PCB ..................................................... 14
3.3.2.4 Murata IPC Reference Design Based on 4-Layer PCB ............................................... 15
3.3.2.5 Murata IPC Reference Design Based on 2-Layer PCB ............................................... 16
3.3.2.6 Summary of Output Power and Harmonics Measurements......................................... 17
3.3.2.7 Overview of Harmonic Emission Regulatory Requirements....................................... 17
3.3.3
Link Budget Calculations of the Various Reference Designs ......................................... 18
4
CONCLUSION .............................................................................................................. 19
5
REFERENCES .............................................................................................................. 20
6
GENERAL INFORMATION........................................................................................... 20
6.1
DOCUMENT HISTORY ............................................................................................... 20
SWRA407
Page 2 of 20
Design Note DN039
2
Abbreviations
DC
EM
ETSI
FCC
FR4
ISM
IPC
JTI
LC
ML
NM
PCB
SoC
SRD
TCXO
WW
XTAL
Direct Current
Evaluation Module
European Telecommunications Standards Institute
Federal Communications Commission
Material type used for producing PCB
Industrial, Scientific, Medical
Integrated Passive Component
Johanson Technology
Inductor (L) Capacitor (C) configuration
Multi-Layer Inductor
Not Mounted
Printed Circuit Board
System on Chip
Short Range Devices
Temperature Compensated Crystal Oscillator
Wire-Wound Inductor
Crystal Oscillator
SWRA407
Page 3 of 20
Design Note DN039
3
Reference Designs Available
There are basically two types of reference designs available for CC112x [1][2][3], and CC117x
[4]; one solution is based upon discrete components [9] and the other is based upon an IPC
[7]. Each reference design has its own particular advantage.
3.1
Discrete Reference Design
The traditional 868/915 MHz reference design for the CC112x and CC117x has been the
discrete solution [9] shown in Figure 2. This design can use either multi-layer inductors or
wire-wound inductors; when using wire-wound inductors, this is the best reference design
for performance.
Figure 2. Discrete Reference Design for the CC112x and CC117x 868/915 MHz
The schematic shown in Figure 2 and Figure 3 have the option to choose between a TCXO
and a XTAL. The discrete components shown within the red marking in Figure 2 are the
components that can be replaced the IPC.
SWRA407
Page 4 of 20
Design Note DN039
3.2
3.2.1
IPC Reference Designs
Schematic
Figure 3. Schematic for the 2-Layer & 4-Layer Reference Design
Component R201 in Figure 3 is only used to shorten the IPC pin to GND with a 0ohm resistor
or to be left as not connected. The Murata IPC requires pin 8 on the IPC to be not connected
whereas the JTI IPC requires this pin to be connected to GND. R201 is only required if the
final pcb will accommodate both vendors of the IPC.
Referring to Figure 3, components C203 and L204 are a part of the antenna matching network
for the integrated PCB helix antenna used on the EM. L205 is not used.
The output impedance from the IPC, pin 7 is 50 ohms.
SWRA407
Page 5 of 20
Design Note DN039
3.2.2
Component Placement
Figure 4. Component Placement for the 2-Layer & 4-Layer Reference Design
3.2.3
Layout
The layout greatly influences the RF performance. TI recommends to always copy our
reference design [7] as closely as possible.
In the event that the reference design [7] cannot be copied then the routing from the RF pins
RF_P & RF_N must be symmetrical to the IPC, U201. The length of the tracks should be kept
to a minimum and preferably the same length that is used in the reference design [7]. If this
routing is not symmetrical; then the output power will be reduced and the harmonics will
increase.
All component ground pads should have the 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.
On the layer directly underneath the RF network; it is important to have a solid ground plane
and to avoid any routing. The power routing has been routed in a star formation on the 2-layer
design as shown in Figure 5 and as a local power plane on the 4-layer design as shown in
Figure 9. The power tracks must always be routed to the decoupling capacitor first; then from
the decoupling capacitor to the pad of the CC112x.
SWRA407
Page 6 of 20
Design Note DN039
3.2.3.1
2-Layer
Figure 5. Layer 1 Layout of the 2-Layer IPC Reference Design
Figure 6. Layer 2 Layout of the 2-Layer IPC Reference Design
SWRA407
Page 7 of 20
Design Note DN039
3.2.3.2
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
SWRA407
Page 8 of 20
Design Note DN039
Figure 9. Layer 3 Layout of the 4-Layer IPC Reference Design
Figure 10. Layer 4 Layout of the 4-Layer IPC Reference Design
SWRA407
Page 9 of 20
Design Note DN039
3.3
Measurement Results
All results presented in this chapter are based on measurements performed with CC112x IPC
EM reference design board [7] or the standard discrete reference design [9]. For the discrete
and Murata IPC solution, a minimum of six units have been measured in order to obtain an
average result which is presented in this report. Only one unit has been measured for the JTI
IPC.
All measurement results presented are the average of each batch tested from typical devices.
0
0
0
The devices have been tested in full temperature (85 C, 25 C & -40 C) and full voltage range
(2.0V, 3.0V & 3.6V).
Note: all values are in dBm if not otherwise stated.
®
SmartRF04 RF studio was used to configure the devices. The settings for the registers are
the default settings used.
3.3.1
Sensitivity (1.2kbps data rate)
3.3.1.1
WW-Inductor Discrete Reference Design Based on 4-Layer PCB
Freq. Band: 868 MHz
Temp
Freq. Band: 915 MHz
Solution
2.0Vcc
3.0Vcc
3.6Vcc
Avg
2.0V
3.0V
3.6V
Avg
0
WW dis 4-L
−124.4
−124.3
−124.4
−124.4
−124.1
−123.8
−123.9
−123.9
0
25 C
WW dis 4-L
−123.2
−123.2
−123.2
−123.2
−122.4
−122.7
−122.5
−122.5
0
85 C
WW dis 4-L
−121.4
−121.3
−121.2
−121.3
−120.6
−120.4
−120.8
−120.6
All
WW dis 4-L
−123.0
−122.9
−122.9
−123.0
−122.4
−122.3
−122.4
−122.4
-40 C
Table 1. Average Sensitivity Values Obtained for WW Discrete 4-Layer
3.3.1.2
ML-Inductor Discrete Reference Design Based on 4-Layer PCB
Freq. Band: 868 MHz
Temp
Freq. Band: 915 MHz
Solution
2.0Vcc
3.0Vcc
3.6Vcc
Avg
2.0V
3.0V
3.6V
Avg
0
ML dis 4-L
−123.5
−123.6
−123.6
−123.6
−122.6
−122.6
−122.7
−122.6
0
25 C
ML dis 4-L
−121.9
−122.1
−122.2
−122.1
−121.0
−121.2
−121.0
−121.1
0
85 C
ML dis 4-L
−120.3
−120.2
−120.5
−120.4
−119.3
−119.6
−119.5
−119.5
All
ML dis 4-L
−121.9
−122.0
−122.1
−122.0
−121.0
−121.1
−121.1
−121.1
-40 C
Table 2. Average Sensitivity Values Obtained for ML Discrete 4-Layer
3.3.1.3
JTI IPC Reference Design Based on 4-Layer PCB
Freq. Band: 868 MHz
Temp
Freq. Band: 915 MHz
Solution
2.0Vcc
3.0Vcc
3.6Vcc
Avg
2.0V
3.0V
3.6V
Avg
0
JTI IPC 4-L
−123.0
−123.0
−123.4
−123.1
−123.8
−123.4
−123.8
−123.7
0
25 C
JTI IPC 4-L
−121.6
−122.2
−122.0
−121.9
−121.8
−122.2
−122.2
−122.1
0
85 C
JTI IPC 4-L
−121.0
−120.6
−120.6
−120.7
−120.6
−120.8
−120.8
−120.7
All
JTI IPC 4-L
−121.9
−121.9
−122.0
−121.9
−122.1
−122.1
−122.3
−122.2
-40 C
Table 3. Average Sensitivity Values Obtained for Murata IPC 4-Layer
SWRA407
Page 10 of 20
Design Note DN039
3.3.1.4
Murata IPC Reference Design Based on 4-Layer PCB
Freq. Band: 868 MHz
Temp
Freq. Band: 915 MHz
Solution
2.0Vcc
3.0Vcc
3.6Vcc
Avg
2.0V
3.0V
3.6V
Avg
0
Murata IPC 4-L
−123.7
−123.5
−123.7
−123.6
−122.6
−122.8
−123.0
−122.8
0
25 C
Murata IPC 4-L
−122.0
−122.3
−121.8
−122.1
−121.3
−121.1
−121.2
−121.2
0
85 C
Murata IPC 4-L
−120.3
−120.3
−120.3
−120.3
−119.7
−119.6
−119.9
−119.7
All
Murata IPC 4-L
−122.0
−122.1
−122.9
−122.0
−121.2
−121.2
−121.4
−121.2
-40 C
Table 4. Average Sensitivity Values Obtained for Murata IPC 4-Layer
3.3.1.5
Murata IPC Reference Design Based on 2-Layer PCB
Freq. Band: 868 MHz
Temp
Freq. Band: 915 MHz
Solution
2.0Vcc
3.0Vcc
3.6Vcc
Avg
2.0V
3.0V
3.6V
Avg
0
Murata IPC 2-L
−123.6
−123.7
−123.4
−123.6
−122.7
−122.4
−122.4
−122.5
0
25 C
Murata IPC 2-L
−122.0
−121.9
−122.3
−122.1
−120.9
−121.0
−121.2
−121.0
0
85 C
Murata IPC 2-L
−120.6
−120.4
−120.3
−120.3
−119.7
−119.6
−119.9
−119.7
All
Murata IPC 2-L
−122.1
−122.0
−122.2
−122.1
−121.0
−120.9
−121.1
−121.0
-40 C
Table 5. Average Sensitivity Values Obtained for Murata IPC 2-Layer
3.3.1.6
Summary of Sensitivity Measurements of the Various Reference Designs
Freq. Band: 868 MHz
Freq. Band: 915 MHz
Temp
Solution
2.0Vcc
3.0Vcc
3.6Vcc
Avg
2.0V
3.0V
3.6V
Avg
All
WW dis 4-L
−123.0
−122.9
−122.9
−123.0
−122.4
−122.3
−122.4
−122.4
All
Murata IPC 2-L
−122.1
−122.0
−122.2
−122.1
−121.0
−120.9
−121.1
−121.0
All
Murata IPC 4-L
−122.0
−122.1
−122.9
−122.0
−121.2
−121.2
−121.4
−121.2
All
ML dis 4-L
−121.9
−122.0
−122.1
−122.0
−121.0
−121.1
−121.1
−121.1
All
JTI IPC 4-L
−121.9
−121.9
−122.0
−121.9
−122.1
−122.1
−122.3
−122.2
Table 6. Sensitivity Measurements Summary
SWRA407
Page 11 of 20
Design Note DN039
3.3.2
3.3.2.1
Output Power and Harmonics (Max power setting)
WW-Inductor Discrete Reference Design Based on 4-Layer PCB
Freq. Band: 868 MHz
Temp
Solution
Vcc
fc
2
3
4
5
6
mA
-40 C
WW dis 4-L
2
11.7
-75.3
-74.9
-75.2
-74.6
-74.4
39.8
-400C
WW dis 4-L
3
14.6
-48.2
-45.3
-60.7
-72.9
-74.4
48.0
0
WW dis 4-L
3.6
15.5
-46.4
-44.7
-59.1
-72.0
-74.1
51.0
0
0
-40 C
-40 C
WW dis 4-L Average
All
13.9
-56.7
-55.0
-65.0
-73.1
-74.3
46.3
0
25 C
WW dis 4-L
2
11.0
-54.8
-47.3
-67.3
-74.9
-74.6
40.3
0
25 C
WW dis 4-L
3
13.8
-49.8
-47.1
-62.3
-74.2
-74.5
47.5
0
25 C
WW dis 4-L
3.6
14.7
-48.1
-46.4
-60.7
-73.4
-74.7
50.5
0
25 C
WW dis 4-L Average
All
13.1
-50.9
-46.9
-63.4
-74.1
-74.6
46.1
0
85 C
WW dis 4-L
2
10.1
-56.1
-51.1
-68.4
-74.6
-74.4
40.0
0
WW dis 4-L
3
12.6
-51.5
-50.4
-64.5
-74.7
-74.3
46.9
0
85 C
WW dis 4-L
3.6
13.5
-49.9
-49.9
-63.6
-74.7
-74.2
49.6
0
85 C
WW dis 4-L Average
All
12.1
-52.5
-50.5
-65.5
-74.7
-74.3
45.5
All
WW dis 4-L Average
All
13.1
-53.3
-50.8
-64.6
-74.0
-74.4
45.9
85 C
Freq. Band: 915 MHz
Temp
Solution
Vcc
fc
2
3
4
5
6
mA
0
WW dis 4-L
2
11.6
-75.8
-75.3
-75.1
-74.3
-72.7
39.5
0
WW dis 4-L
3
14.3
-54.4
-43.5
-61.3
-74.2
-72.8
47.1
0
WW dis 4-L
3.6
15.2
-52.4
-42.8
-60.0
-73.7
-72.8
50.1
0
-40 C
WW dis 4-L Average
All
13.7
-60.8
-53.9
-65.5
-74.1
-72.8
45.6
0
25 C
WW dis 4-L
2
10.7
-60.7
-47.6
-67.8
-74.5
-72.9
39.8
0
25 C
WW dis 4-L
3
13.3
-55.7
-46.6
-63.7
-74.6
-73.0
46.2
0
25 C
WW dis 4-L
3.6
14.2
-53.9
-45.9
-62.4
-74.3
-72.8
49.2
0
25 C
WW dis 4-L Average
All
12.7
-56.8
-46.7
-64.6
-74.4
-72.9
45.1
0
85 C
WW dis 4-L
2
9.6
-61.7
-53.4
-70.1
-75.3
-73.5
39.3
0
-40 C
-40 C
-40 C
WW dis 4-L
3
11.9
-57.3
-51.6
-67.1
-74.5
-73.0
45.4
0
85 C
WW dis 4-L
3.6
12.7
-55.7
-51.2
-66.1
-74.4
-72.7
48.0
0
85 C
WW dis 4-L Average
All
11.4
-58.2
-52.1
-67.8
-74.8
-73.1
44.3
All
WW dis 4-L Average
All
12.6
-58.6
-50.9
-66.0
-74.4
-72.9
45.0
85 C
Table 7. Output Power and Harmonics - WW Discrete 4-Layer
SWRA407
Page 12 of 20
Design Note DN039
3.3.2.2
ML-Inductor Discrete Reference Design Based on 4-Layer PCB
Freq. Band: 868 MHz
Temp
Solution
Vcc
fc
2
3
4
5
6
mA
0
ML dis 4-L
2
11.6
-75.1
-74.7
-74.7
-74.4
-73.8
37.9
0
ML dis 4-L
3
14.5
-62.5
-66.8
-64.1
-74.6
-66.6
46.3
0
ML dis 4-L
3.6
15.4
-60.8
-66.0
-62.9
-73.8
-65.7
49.5
0
-40 C
ML dis 4-L Average
All
13.9
-66.1
-69.2
-67.2
-74.3
-68.7
44.6
0
25 C
ML dis 4-L
2
10.8
-68.9
-69.3
-71.5
-74.3
-72.3
38.2
0
25 C
ML dis 4-L
3
13.5
-64.1
-68.8
-66.1
-74.1
-68.1
45.4
0
25 C
ML dis 4-L
3.6
14.4
-61.9
-68.7
-64.7
-74.7
-67.3
48.4
0
25 C
ML dis 4-L Average
All
12.9
-64.9
-68.9
-67.4
-74.4
-69.2
44.0
0
85 C
ML dis 4-L
2
9.6
-69.5
-72.8
-72.1
-75.3
-74.2
38.1
0
-40 C
-40 C
-40 C
85 C
ML dis 4-L
3
12.0
-65.8
-72.1
-69.4
-74.3
-71.8
43.9
0
85 C
ML dis 4-L
3.6
12.8
-64.6
-71.6
-68.3
-74.5
-71.7
46.6
0
85 C
ML dis 4-L Average
All
11.5
-66.7
-72.2
-69.9
-74.7
-72.6
42.9
All
ML dis 4-L Average
All
12.7
-65.9
-70.1
-68.2
-74.5
-70.2
43.8
Freq. Band: 915 MHz
Temp
Solution
Vcc
fc
2
3
4
5
6
mA
0
ML dis 4-L
2
10.4
-75.4
-74.9
-74.8
-74.4
-72.4
35.6
0
-40 C
ML dis 4-L
3
13.1
-63.7
-69.3
-64.8
-73.6
-65.4
42.5
-400C
ML dis 4-L
3.6
14.0
-62.4
-68.1
-63.3
-72.5
-64.1
45.4
-40 C
ML dis 4-L Average
All
12.5
-67.2
-70.7
-67.6
-73.5
-67.3
41.2
0
25 C
ML dis 4-L
2
9.5
-67.1
-72.0
-72.4
-74.8
-69.0
36.1
0
25 C
ML dis 4-L
3
12.1
-64.5
-70.4
-66.6
-73.8
-66.4
41.9
0
25 C
ML dis 4-L
3.6
13.0
-63.2
-70.0
-65.0
-73.9
-65.5
44.7
0
25 C
ML dis 4-L Average
All
11.5
-64.9
-70.8
-68.0
-74.2
-67.0
40.9
0
85 C
ML dis 4-L
2
8.3
-68.7
-74.6
-75.1
-84.5
-77.1
36.4
0
-40 C
0
85 C
ML dis 4-L
3
10.4
-65.3
-73.7
-70.3
-74.0
-72.4
41.2
0
85 C
ML dis 4-L
3.6
11.2
-64.1
-73.4
-69.8
-74.1
-72.0
43.6
0
85 C
ML dis 4-L Average
All
10.0
-66.0
-73.9
-71.7
-77.5
-73.8
40.4
All
ML dis 4-L Average
All
11.3
-66.1
-71.8
-69.1
-75.1
-69.4
40.8
Table 8. Output Power and Harmonics - ML Discrete 4-Layer
SWRA407
Page 13 of 20
Design Note DN039
3.3.2.3
JTI IPC Reference Design Based on 4-Layer PCB
Freq. Band: 868 MHz
Temp
Solution
Vcc
fc
2
3
4
5
6
mA
0
JTI IPC 4-L
2
11.2
-55.9
-74.3
-75
-74.5
-74
41.2
0
JTI IPC 4-L
3
14.1
-50.3
-42.6
-56
-55.6
-65.5
51
0
JTI IPC 4-L
3.6
14.9
-50
-41.6
-55.1
-55.2
-63.3
54.9
0
-40 C
JTI IPC 4-L Average
All
13.4
-52.1
-52.8
-62
-61.7
-67.6
49.0
0
25 C
JTI IPC 4-L
2
10.2
-52
-47.4
-60.2
-59.7
-70.1
41.7
0
25 C
JTI IPC 4-L
3
12.9
-50.7
-45.1
-57.6
-58.5
-68.2
50.6
0
25 C
JTI IPC 4-L
3.6
13.7
-50.3
-44.2
-56.9
-58.3
-66.6
54.3
0
25 C
JTI IPC 4-L Average
All
12.2
-51
-45.6
-58.2
-58.8
-68.3
48.9
0
85 C
JTI IPC 4-L
2
8.6
-53.3
-51.8
-66.2
-66.6
-80
40.7
0
-40 C
-40 C
-40 C
85 C
JTI IPC 4-L
3
10.6
-52.8
-50.4
-64.4
-65
-73.2
47.7
0
85 C
JTI IPC 4-L
3.6
11.1
-52.8
-49.5
-64.7
-66.3
-73.1
50.3
0
85 C
JTI IPC 4-L Average
All
10.1
-53.0
-50.6
-65.1
-66.0
-75.4
46.2
All
JTI IPC 4-L Average
All
11.9
-52.0
-49.7
-61.8
-62.2
-70.4
48.0
Freq. Band: 915 MHz
Temp
Solution
Vcc
fc
2
3
4
5
6
mA
0
JTI IPC 4-L
2
10.3
-72.3
-75.1
-74.2
-73.9
-71.6
37.2
0
-40 C
JTI IPC 4-L
3
13.2
-49.1
-45.8
-59.2
-56.8
-63.1
45.4
-400C
JTI IPC 4-L
3.6
13.9
-60.3
-67.1
-64.2
-71.9
-63.7
44.7
-40 C
JTI IPC 4-L Average
All
12.5
-60.5
-62.7
-65.9
-67.6
-66.1
42.4
0
25 C
JTI IPC 4-L
2
9.3
-52.2
-48.4
-68.2
-61.8
-71.5
38
0
25 C
JTI IPC 4-L
3
11.9
-49.8
-48.1
-61.7
-60
-65.9
45.2
0
25 C
JTI IPC 4-L
3.6
12.8
-48.9
-47.3
-60.4
-59.5
-66.1
48.3
0
25 C
JTI IPC 4-L Average
All
11.3
-50.3
-47.9
-63.4
-60.4
-67.8
43.8
0
85 C
JTI IPC 4-L
2
7.4
-55.7
-54.1
-80.5
-70.7
-83
37.6
0
-40 C
0
85 C
JTI IPC 4-L
3
9.3
-53.1
-53.4
-73.6
-69.6
-73
43.3
0
85 C
JTI IPC 4-L
3.6
9.8
-53.1
-52.7
-72.2
-69.7
-72.6
45.7
0
85 C
JTI IPC 4-L Average
All
8.8
-54.0
-53.4
-75.4
-70.0
-76.2
42.2
All
JTI IPC 4-L Average
All
10.9
-54.9
-54.7
-68.2
-66.0
-70.0
42.8
Table 9. Output Power and Harmonics - JTI IPC 4-Layer
SWRA407
Page 14 of 20
Design Note DN039
3.3.2.4
Murata IPC Reference Design Based on 4-Layer PCB
Freq. Band: 868 MHz
Temp
Solution
Vcc
fc
2
3
4
5
6
mA
0
Murata IPC 4-L
2
11.3
-52.9
-74.7
-75.6
-74.8
-74.5
40.5
0
Murata IPC 4-L
3
14.3
-37.8
-40.8
-41.0
-39.8
-53.7
48.9
0
Murata IPC 4-L
3.6
15.1
-36.8
-40.3
-39.1
-38.3
-52.3
51.8
0
-40 C
Murata IPC 4-L
Average
All
13.6
-42.5
-51.9
-51.9
-51.0
-60.2
47.0
250C
Murata IPC 4-L
2
10.5
-43.9
-42.4
-45.3
-46.7
-59.8
41.2
0
25 C
Murata IPC 4-L
3
13.3
-40.4
-42.0
-41.4
-43.2
-56.0
48.7
0
25 C
Murata IPC 4-L
3.6
14.2
-39.2
-41.4
-39.7
-41.9
-54.9
51.7
0
25 C
Murata IPC 4-L
Average
All
12.7
-41.2
-41.9
-42.2
-43.9
-56.9
47.2
850C
Murata IPC 4-L
2
9.5
-46.4
-45.5
-46.7
-53.8
-64.3
40.8
0
-40 C
-40 C
-40 C
85 C
Murata IPC 4-L
3
12.1
-43.2
-44.7
-43.1
-49.5
-60.9
47.8
0
85 C
Murata IPC 4-L
3.6
13.0
-42.1
-44.4
-41.8
-48.7
-60.8
50.6
0
85 C
Murata IPC 4-L
Average
All
11.6
-43.9
-44.9
-43.9
-50.7
-62.0
46.4
All
Murata IPC 4-L
Average
All
12.6
-42.5
-46.2
-46.0
-48.5
-59.7
46.9
Freq. Band: 915 MHz
Temp
Solution
Vcc
fc
2
3
4
5
6
mA
0
Murata IPC 4-L
2
10.6
-61.6
-75.1
-75.1
-74.7
-72.6
39.0
0
Murata IPC 4-L
3
13.4
-50.7
-40.7
-33.8
-56.8
-54.6
46.4
0
Murata IPC 4-L
3.6
14.2
-49.5
-40.2
-32.0
-55.4
-53.4
49.1
0
-40 C
Murata IPC 4-L
Average
All
12.7
-53.9
-52.0
-47.0
-62.3
-60.2
44.8
250C
Murata IPC 4-L
2
9.8
-57.5
-43.0
-39.0
-63.1
-59.9
39.6
0
25 C
Murata IPC 4-L
3
12.4
-54.1
-42.3
-35.5
-59.1
-56.7
46.2
0
25 C
Murata IPC 4-L
3.6
13.3
-52.7
-41.8
-34.0
-58.0
-56.1
49.1
0
25 C
Murata IPC 4-L
Average
All
11.8
-54.8
-42.4
-36.2
-60.1
-57.6
45.0
850C
Murata IPC 4-L
2
8.7
-60.1
-47.3
-42.1
-69.6
-66.2
39.3
0
-40 C
-40 C
-40 C
85 C
Murata IPC 4-L
3
11.1
-57.1
-46.5
-39.0
-65.2
-63.9
45.2
0
85 C
Murata IPC 4-L
3.6
11.9
-55.9
-46.2
-38.2
-65.0
-65.3
47.9
0
85 C
Murata IPC 4-L
Average
All
10.6
-57.7
-46.7
-39.8
-66.6
-65.2
44.2
All
Murata IPC 4-L
Average
All
11.7
-55.5
-47.0
-41.0
-63.0
-61.0
44.7
Table 10. Output Power and Harmonics - Murata IPC 4-Layer
SWRA407
Page 15 of 20
Design Note DN039
3.3.2.5
Murata IPC Reference Design Based on 2-Layer PCB
Freq. Band: 868 MHz
Temp
Solution
Vcc
fc
2
3
4
5
6
mA
0
Murata IPC 2-L
2
10.6
-65.0
-75.1
-75.5
-74.4
-74.3
38.8
0
Murata IPC 2-L
3
13.3
-38.2
-37.7
-37.0
-40.7
-57.3
45.6
0
Murata IPC 2-L
3.6
14.1
-37.1
-37.2
-35.2
-39.5
-56.2
48.0
0
-40 C
Murata IPC 2-L
Average
All
12.6
-46.8
-50.0
-49.2
-51.5
-62.6
44.1
250C
Murata IPC 2-L
2
9.9
-44.1
-40.0
-42.0
-48.1
-62.5
39.7
0
25 C
Murata IPC 2-L
3
12.6
-40.6
-39.0
-37.8
-44.3
-59.1
46.3
0
25 C
Murata IPC 2-L
3.6
13.4
-39.4
-38.5
-36.2
-43.3
-58.4
49.0
0
25 C
Murata IPC 2-L
Average
All
11.9
-41.3
-39.2
-38.6
-45.2
-60.0
45.0
850C
Murata IPC 2-L
2
9.1
-46.6
-42.6
-43.7
-54.7
-66.2
39.9
0
-40 C
-40 C
-40 C
Murata IPC 2-L
3
11.6
-43.1
-41.6
-39.6
-50.2
-63.4
46.4
0
85 C
Murata IPC 2-L
3.6
12.4
-41.9
-41.2
-38.5
-49.4
-63.3
49.1
0
85 C
Murata IPC 2-L
Average
All
11.0
-43.8
-41.8
-40.6
-51.4
-64.3
45.1
All
Murata IPC 2-L
Average
All
11.9
-44.0
-43.6
-42.8
-49.4
-62.3
44.8
85 C
Freq. Band: 915 MHz
Temp
Solution
Vcc
fc
2
3
4
5
6
mA
0
Murata IPC 2-L
2
10.5
-72.5
-74.7
-73.9
-74.6
-73.1
38.6
0
Murata IPC 2-L
3
12.9
-52.3
-37.7
-30.8
-56.4
-56.5
44.7
0
Murata IPC 2-L
3.6
13.7
-51.0
-37.2
-29.2
-55.5
-55.8
47.2
0
-40 C
Murata IPC 2-L
Average
All
12.4
-58.6
-49.9
-44.6
-62.2
-61.8
43.5
250C
Murata IPC 2-L
2
9.7
-56.8
-40.8
-36.5
-62.9
-61.9
39.3
250C
Murata IPC 2-L
3
12.1
-53.2
-39.6
-33.0
-59.2
-59.2
45.2
0
25 C
Murata IPC 2-L
3.6
13.0
-51.9
-39.0
-31.5
-58.3
-58.6
47.8
0
25 C
Murata IPC 2-L
Average
All
11.6
-54.0
-39.8
-33.7
-60.1
-59.9
44.1
850C
Murata IPC 2-L
2
8.7
-58.1
-44.4
-39.9
-69.6
-68.2
39.3
0
-40 C
-40 C
-40 C
Murata IPC 2-L
3
11.0
-54.6
-43.2
-36.5
-65.0
-65.7
44.9
0
85 C
Murata IPC 2-L
3.6
11.8
-53.4
-42.9
-35.6
-64.2
-65.9
47.5
0
85 C
Murata IPC 2-L
Average
All
10.5
-55.4
-43.5
-37.3
-66.3
-66.6
43.9
All
Murata IPC 2-L
Average
All
11.5
-56.0
-44.4
-38.5
-62.9
-62.8
43.8
85 C
Table 11. Output Power and Harmonics - Murata IPC 2-Layer
SWRA407
Page 16 of 20
Design Note DN039
3.3.2.6
Summary of Output Power and Harmonics Measurements
Freq. Band: 868 MHz
Temp
Solution
Vcc
fc
2
3
4
5
6
mA
All
WW dis 4-L Average
All
13.1
-53.3
-50.8
-64.6
-74.0
-74.4
45.9
All
ML dis 4-L Average
All
12.7
-65.9
-70.1
-68.2
-74.5
-70.2
43.8
All
Murata IPC 4-L
Average
All
12.6
-42.5
-46.2
-46.0
-48.5
-59.7
46.9
All
Murata IPC 2-L
Average
All
11.9
-44.0
-43.6
-42.8
-49.4
-62.3
44.8
All
JTI IPC 4-L Average
All
11.9
-52.0
-49.7
-61.8
-62.2
-70.4
48.0
Freq. Band: 915 MHz
Temp
Solution
Vcc
fc
2
3
4
5
6
mA
All
WW dis 4-L Average
All
12.6
-58.6
-50.9
-66.0
-74.4
-72.9
45.0
All
Murata IPC 4-L
Average
All
11.7
-55.5
-47.0
-41.0
-63.0
-61.0
44.7
All
Murata IPC 2-L
Average
All
11.5
-56.0
-44.4
-38.5
-62.9
-62.8
43.8
All
ML dis 4-L Average
All
11.3
-66.1
-71.8
-69.1
-75.1
-69.4
40.8
All
JTI IPC 4-L Average
All
10.9
-54.9
-54.7
-68.2
-66.0
-70.0
42.8
Table 12. Output Power and Harmonics Summary
Limit values used in Table 7, Table 8, Table 9, Table 10, Table 11 and Table 12 are taken
from the ETSI EN 300 220 regulations for 868 MHz and FCC 15.247 for 915 MHz. The
harmonic values shown in red exceed the conducted regulatory requirements; this is only an
issue when an external antenna will be used in the final application. For applications which
require conducted requirements then an external LC can be used.
The average current consumption of the JTI IPC is slightly higher than the Murata IPC and the
discrete solution.
3.3.2.7
Overview of Harmonic Emission Regulatory Requirements
Harmonic emission will depend on ground plane geometry, encapsulation etc. Table 13 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 13, if duty cycling is being used.
Harmonics
nd
rd
th
Limit
2
3
4
5th
6th
7th
8th
9th
FCC
15.249
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
20
dBc
54
dBµV/m
54
dBµV/m
54
dBµV/m
20
dBc
20
dBc
54
dBµV/m
54
dBµV/m
ETSI EN
300 220
−30
dBm
−30
dBm
−30
dBm
−30
dBm
−30
dBm
−30
dBm
−30
dBm
−30
dBm
Table 13. ETSI and FCC Limits for Harmonic Radiation
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
SWRA407
Page 17 of 20
Design Note DN039
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.
 t 
CF = −20 • log

 100ms 
Equation 1. FCC Correction Factor
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.
3.3.3
Link Budget Calculations of the Various Reference Designs
Freq. Band: 868 MHz
Vcc
Rx
I_stx
Power
_stx
Temp
Solution
(V)
(dBm)
(mA)
(dBm)
link
budget
(dB)
All
WW dis 4-L Average
All
-123.0
45.9
13.1
136.1
ETSI and FCC approved
All
ML dis 4-L Average
All
-122.0
43.8
12.7
134.7
ETSI and FCC approved
All
Murata IPC 4-L
Average
All
-122.0
46.9
12.6
134.6
ETSI approved
All
Murata IPC 2-L
Average
All
-122.1
44.8
11.9
134.0
ETSI approved
All
JTI IPC 4-L Average
All
-121.9
48
11.9
133.8
ETSI and FCC approved
Comments
Freq. Band: 915 MHz
Vcc
Rx
I_stx
Power
_stx
Temp
Solution
(V)
(dBm)
(mA)
(dBm)
link
budget
(dB)
All
WW dis 4-L Average
All
-122.4
45
12.6
135.0
ETSI and FCC approved
All
JTI IPC 4-L Average
All
-122.2
42.8
10.9
133.1
ETSI and FCC approved
All
Murata IPC 4-L
Average
All
-121.2
44.7
11.7
132.9
Limitations with 3rd & 4th FCC
conducted harmonic
All
Murata IPC 2-L
Average
All
-121.0
43.8
11.5
132.5
Limitations with 3rd & 4th FCC
conducted harmonic
All
ML dis 4-L Average
All
-121.1
40.8
11.3
132.4
ETSI and FCC approved
Comments
Table 14. Link Budget Calculations of the Various Reference Designs
SWRA407
Page 18 of 20
Design Note DN039
4
Conclusion
As an alternative to the traditional discrete reference designs as shown in Figure 2, the IPC
reference designs can match the performance of the discrete multi-layer inductor reference
design with a lower component count. The 868 / 915 MHz discrete solution has a total of 13
components in the RF section compared to the IPC solution of a singular component.
Both the Murata and JTI IPC device have the same footprint and pin-out; each device can be
a second source pending assembly of R201 as shown in Figure 3. If second source is not
critical for the IPC part then resistor R201 is not needed.
The majority of application have an internal antenna but for applications that require
conducted emissions approval (application with an external RF connector); an external LC
rd
th
filter may be required to pass 3 and 4 conducted emissions for the Murata IPC part.
For best-in-class RF performance; the discrete wire-wound inductor solution is still
recommended but for compact and cost sensitive solutions the IPC reference designs should
be considered. Refer toTable 15 for recommended usage for the various reference designs.
Freq. Band: 868 MHz
Application
RF
Component
Count
Cost
link
budget
(dB)
Solution
Recommendations
Comments
WW dis 4-L
RF Best-in-class
performance
13
Middle
136.1
ETSI and FCC
approved
ML dis 4-L
-
13
Low
134.7
ETSI and FCC
approved
Murata IPC 4-L
Recommended for
compact and cost
sensitive solutions
at 868 MHz
1
Lowest
134.6
ETSI approved
Murata IPC 2-L
Recommended for
2-layer solutions at
868 MHz
1
Lowest
134.0
ETSI approved
JTI IPC 4-L
-
1
Middle
133.8
ETSI and FCC
approved
RF
Component
Count
Cost
link
budget
(dB)
Freq. Band: 915 MHz
Application
Solution
Recommendations
Comments
WW dis 4-L
RF Best-in-class
performance
13
Middle
135.0
ETSI and FCC
approved
JTI IPC 4-L
Recommended for
compact solutions
at 915 MHz
1
Middle
133.1
ETSI and FCC
approved
Murata IPC 4-L
Recommended for
cost sensitive
solutions at 915
MHz
1
Lowest
132.9
Limitations with
3rd & 4th FCC
conducted
harmonic
Murata IPC 2-L
Recommended for
2-layer solutions at
915 MHz
1
Lowest
132.5
Limitations with
3rd & 4th FCC
conducted
harmonic
ML dis 4-L
-
13
Low
132.4
ETSI and FCC
approved
Table 15. Recommendations and Link Budget for the Various Reference Designs
SWRA407
Page 19 of 20
Design Note DN039
5
References
[1] CC1120 Data Sheet (cc1120.pdf)
[2] CC1121 Data Sheet (cc1121.pdf)
[3] CC1125 Data Sheet (cc1125.pdf)
[4] CC1175 Data Sheet (cc1175.pdf)
[5] Murata contact information: http://www.murata.com/contact/index.html
[6] JTI contact information: http://www.johansontechnology.com/en/contact.html
[7] CC112x IPC 868/915 MHz 4-Layer Ref. Design Rev1.0 (swrr107.zip)
[8] CC112x IPC 868/915 MHz 2-Layer Ref. Design Rev1.0 (swrr106.zip)
[9] CC112x EM 868/915 MHz Reference Design (swrc224.zip)
6
6.1
General Information
Document History
Revision
Date
Description/Changes
SWRA407
2012.08.20
Initial release.
SWRA407
Page 20 of 20
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