Manual

2
U3742BM
4735A–RKE–11/03
Figure 1. System Block Diagram
Figure 2. Block Diagram
Demod.
IF Amp
LNA VCO
PLL XTO
Control
U3742BM
1...3
Micro-
controller
Power
amp.
XTO
VCO
PLL
U2741B
Antenna Antenna
UHF ASK/FSK
Remote control transmitter
UHF ASK/FSK
Remote control receiver
Encoder
ATARx9x
1 Li cell
Keys
FSK/ASK-
Demodulator
and data filter
IF Amp
IF Amp
4. Order
LPF
3 MHz
LPF
3 MHz
Dem_out
Limiter outRSSI
Sensitivity
reduction
Standby logic
Polling circuit
and
control logic
FE CLK
VCO XTO
64
f
50 kΩ
V
S
FSK/ASK
CDEM
AVCC
SENS
AGND
DGND
MIXVCC
LNAGND
LNA_IN
DATA
ENABLE
TEST
MODE
LFGND
LFVCC
XTO
LF
DVCC
LNA
RSSI