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4420-DKDB1 Datasheet(PDF) 28 Page - List of Unclassifed Manufacturers |
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4420-DKDB1 Datasheet(HTML) 28 Page - List of Unclassifed Manufacturers |
28 / 33 page Si4420 28 RX-TX ALIGNMENT PROCEDURES RX-TX frequency offset can be caused only by the differences in the actual reference frequency. To minimize these errors it is suggested to use the same crystal type and the same PCB layout for the crystal placement on the RX and TX PCBs. To verify the possible RX-TX offset it is suggested to measure the CLK output of both chips with a high level of accuracy. Do not measure the output at the XTL pin since the measurement process itself will change the reference frequency. Since the carrier frequencies are derived from the reference frequency, having identical reference frequencies and nominal frequency settings at the TX and RX side there should be no offset if the CLK signals have identical frequencies. It is possible to monitor the actual RX-TX offset using the AFC status report included in the status byte of the receiver. By reading out the status byte from the receiver the actual measured offset frequency will be reported. In order to get accurate values the AFC has to be disabled during the read by clearing the "en" bit in the AFC Control Command (bit 0). TYPICAL APPLICATIONS Repeater Demo (915 MHz) Schematics 6V 3,3V P0.0 2 P0.1 1 P0.2 28 P0.3 27 P0.4 26 P0.5 25 P0.6 24 P0.7 23 P1.0 22 P1.1 21 P1.2 20 P1.3 19 P1.4 18 P1.5 17 P1.6 16 P1.7 15 P2.0 14 P2.1 13 P2.2 12 P2.3 11 P2.4 10 P2.5 9 P2.6 8 P2.7 7 P3.0/C2D 6 /RST/C2CK 5 VDD 4 GND 3 IC1 5 3 4 1 SW1 6 R3 R4 R5 R6 C1 2 1 SJ1 R7 1 2 3 J1 1 2 3 DEBUG C2 Q1 1 2 34 5 IC3 GND IN ON OUT POK C3 C4 1 2 BATTERY C5 C6 C7 X1 SDI 1 SCK 2 NSEL 3 SDO 4 NIRQ 5 FSK/DATA/NFFS 6 DCLK/CFIL 7 NINT/VDI 16 XTL/REF 9 CLK 8 VSS 11 RF2 12 RF1 13 VDD 14 ARSSI 15 NRES 10 IC2 TX TX RX RX SEL SEL CLK CLK IRQ IRQ SCK SCK MISO MISO MOSI MOSI FFS FFS FFE FFE INT/VDI INT/VDI ARSSI ARSSI C8051F311 GND GND 820 820 820 820 GND GND VCC 100nF GND GND 1k 4,7nF 10MHz GND GND VCC GND IA2112-3.3V 2,2uF 2,2uF 1uF 100pF 10pF GND GND IA4420-REVC |
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