U2745B Datasheet, PDF (2/9 Pages) ATMEL Corporation – UHF ASK TRANSMITTER

Figure 1. System Block Diagram
1 Li cell
Encoder
Keys ^ATARx9x
UHF ASK
Remote control transmitter
UHF ASK
Remote control receiver
U2745B
U3745BM
Demod.
1...3
Control
XTO
PLL
VCO
Antenna Antenna
IF Amp
PLL
XTO
Power
amp.
LNA
VCO
Figure 2. Block Diagram
ASK
EN
VCC
CLK
GND
LFVCC
LFGND
LF
OR
Power
up
VCO
f
64
f
n
U2745B
PA
XTO
GND
PWRSET
PWRVCC
ANT
PWRGND1
PWRGND2
XTO1
NC
2 U2745B
4734A–RKE–11/03