T2802 ATMEL [ATMEL Corporation], T2802 Datasheet - Page 14

• Manufacturer Part Number: T2802
• Description: 2.4 GHz WDECT/ISM SINGLE-CHIP TRANSCEIVER
• Manufacturer: ATMEL [ATMEL Corporation]

Figure 3. PLL Principle
14
T2802
Baseband controller
Controlled phase shifting
Programable counter PC
"- Main counter MC
"- Swallow counter SC
REF_CLK
f
Reference counter RC
VCO
13.824 MHz
20.736 MHz
27.648 MHz
10.368 MHz
Phase frequency
detector PD
f
PD
PLL reference
Frequency
REF_CLK
= f
= 3.456 MHz
PD
RF_IN
x (S
MC
x 32 + S
S
3
4
6
8
RC
SC
)
6.912 MHz
Charge
pump
Modulation
compensation MCC
VCO
DAC
TX_DATA
ext. loop filter
1.152 Mbit/s
Gaussian
filter GF
VCO
GF_DATA
f
VCO
Divider
by 2
PA driver
Mixer
4509F–DECT–10/03