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| ATR2406_14 Datasheet, PDF (10/26 Pages) ATMEL Corporation – Low-IF 2.4-GHz ISM Transceiver | |||
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8. PLL Principle
Figure 8-1. PLL Principle
Programmable counter PC
"- Main counter MC
"- Swallow counter SC
fCVO = 1728kHz x (SMC x 32 + SSC)
Phase frequency
detector (PD)
fPD = 1728kHz
Charge
pump
External
loop filter
VCO
Divide
by 2
PA driver
Mixer
Reference counter (RC)
REF_CLK
D7
10.368MHz
0
13.824MHz
1
Gaussian
filter (GF)
PLL reference frequency
REF_CLK
Baseband controller
TXDAT
Table 8-1 shows the LO frequencies for RX and TX in the 2.4-GHz ISM band. There are 95 channels available. Since the
ATR2406 supports wideband modulation with 400-kHz deviation, every second channel can be used without overlap in the
spectrum.
Table 8-1. LO Frequencies
Mode
fIF/kHz
TX
RX
864
Channel
C0
C1
...
C93
C94
C0
C1
...
C93
C94
fANT/MHz
2401.056
2401.920
...
2481.408
2482.272
2401.056
2401.920
...
2481.408
2482.272
fVCO/MHz divided by 2
2401.056
2401.920
...
2481.408
2482.272
2401.920
2402.784
...
2482.272
2483.136
SMC SSC
N
86 27 2779
86 28 2780
...
...
...
89 24 2872
89 25 2873
86 28 2780
86 29 2781
...
...
...
89 25 2873
89 26 2874
10 ATR2406 [DATASHEET]
4779QâISMâ09/14
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