U2741B Datasheet, PDF (2/9 Pages) ATMEL Corporation – UHF ASK/FSK TRANSMITTER

Figure 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 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
4733A–RKE–11/03