13
ATA5756/ATA5757 [Preliminary]
4702D–RKE–02/04
Figure 11. FSK Application Circuit
ANT2
ANT1
ENABLE
ATARx9x
C3
VS
C1
VS
C4
Loop
Antenna
BPXY
OSC1
7
BPXY
BPXY
VSS
20
VDD
1
VS
L1
XTAL
C2
S1
S2
BPXY
CLK
FSK
GND
VS
XTO2
1
3
4
5 6
8
9
10
VCO
LF
CP
f
24/
XTO
PLL
PA
f
8
Power up/down
ATA5756/ATA5757
PFD
ASK
2
XTO1
7
EN
OR
EN
Ampl. OK
C5
32
