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 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46C and to discontinue any product or service per JESD48B. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All semiconductor products (also referred to herein as “components”) are sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment. 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