Rev. 0.3 Copyright © 2014 by Silicon Laboratories AN658
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Si446X AND ARIB STD-T67 COMPLIANCE AT 426–429 MHZ
1. Introduction
This application note demonstrates the compliance of Si446x (B0, B1, C0, C1, C2) RFICs with the regulatory
requirements of ARIB STD-T67 (V1.1, dated November 30th 2005) in the 426/429 MHz band. Although other
members and revisions of the Si446x family of chips may also be used to achieve compliance within this frequency
band, the measurements within this document were taken with an Si4461-B0 RFIC on a 4461-TSC13D434 Direct
Tie RF Test Card (see “7. Reference Design Schematic” ).
The Si4461-B0 chip was configured to transmit at +10 dBm output power by appropriate settings of the DDAC[6:0]
field in the PA_PWR_LVL property 0x2201 and the OB[5:0] field in the PA_BIAS_CLKDUTY property 0x2202.
Various data rates and deviations were chosen in order to comply with the permissible channel spacings and
occupied bandwidths. The tests were performed at a supply voltage of V
DD
=3.3 V.
1.1. Summary of Measured Results
A summary of measured results is provided in Table 1.
Table 1. Summary of Measured Results
Spec Par Parameter Condition Limit Measured Margin
3.2 (1) TX Antenna Power +10 dBm +9.93 dBm 0.07 dB
3.2 (9) AdjChan Leakage Power 25 kHz channel –40 dBc –63.59 dBc 23.59 dB
12.5 kHz channel –40 dBc –61.85 dBc 21.85 dB
12.5 kHz channel –40 dBc –65.78 dBc 25.78 dB
3.2 (10) Occupied Bandwidth 25 kHz channel 16.0 kHz 8.12 kHz 7.88 kHz
12.5 kHz channel 8.5 kHz 6.73 kHz 1.77 kHz
12.5 kHz channel 8.5 kHz 6.69 kHz 1.81 kHz
3.2 (11) Spurious Emissions –26 dBm –53.97 dBm 27.97 dB
3.3 (1) Reference Sensitivity 25 kHz channel –101 dBm –119.7 dBm 18.7 dB
12.5 kHz channel –101 dBm –119.9 dBm 18.9 dB
12.5 kHz channel –101 dBm –120.6 dBm 19.6 dB
3.3 (2) Spurious Selectivity 25 kHz channel 40 dB 41.9 dB 1.9 dB
12.5 kHz channel 40 dB 41.6 dB 1.6 dB
12.5 kHz channel 40 dB 41.2 dB 1.2 dB
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3.3 (3) AdjChan Selectivity 25 kHz channel 30 dB 60.8 dB 30.8 dB
12.5 kHz channel 30 dB 44.8 dB 14.8 dB
12.5 kHz channel 30 dB 60.3 dB 30.3 dB
3.3 (5) RX Secondary Emissions –54 dBm –73.34 dBm 19.34 dB
Table 1. Summary of Measured Results (Continued)
Spec Par Parameter Condition Limit Measured Margin