ATR2406_06 Datasheet, PDF (9/25 Pages) ATMEL Corporation – Low-IF 2.4-GHz ISM Transceiver

7. PLL Principle
Figure 7-1. PLL Principle
Programable counter PC
"- Main counter MC
"- Swallow counter SC
f_VCO = 1728 kHz × (S_MC × 32 + S_SC)
Phase frequency
detector PD
f_PD = 1728 kHz
External
loop filter
Charge
pump
VCO
ATR2406
Divider
by 2
PA driver
Mixer
Reference counter RC
REF_CLK
D7
10.368 MHz
0
13.824 MHz
1
PLL reference
Frequency
REF_CLK
Baseband controller
Gaussian
filter GF
TXDAT
9
4779L–ISM–09/06