U2741B_05 Datasheet, PDF (2/11 Pages) ATMEL Corporation – UHF ASK/FSK TRANSMITTER

Figure 1-1. System Block Diagram
1 Li cell
Encoder
Keys ^ATARx9x
UHF ASK/FSK
Remote control transmitter
UHF ASK/FSK
Remote control receiver
U2741B
U3741BM
Demod.
1...3
Control
XTO
PLL
VCO
Antenna Antenna
IF Amp
PLL
XTO
Power
amp.
LNA
VCO
Figure 1-2. Block Diagram
ASK
FSK
VCC
CLK
GND
LFVCC
LFGND
LF
OR
Power
up
VCO
f
64
f
n
U2741B
PA
XTO
DIVC
PWRSET
PWRVCC
ANT
PWRGND1
PWRGND2
XTO1
XTO2
2 U2741B
4733B–RKE–09/05