Rainbow Electronics U3741BM - Manual (Page 2)

2
U3741BM
4662B–RKE–10/04
System Block Diagram
Block Diagram
Demod
Control
U3741BM
1...3
U2741B
Antenna
Antenna
UHF ASK/FSK
Remote control transmitter
UHF ASK/FSK
Remote control receiver
1 Li cell
Keys
µC
PLL XTO
VCO LNA
PLL
VCO XTO
Encoder
ATARx9x
Power
amp.
FSK/ASK-
Demodulator
and data filter
IF Amp
IF Amp
4 th Order
LPF
3 MHz
LPF
3 MHz
DEMOD_OUT
Limiter out RSSI
Sensitivity
reduction
Standby logic
Polling circuit
and
control logic
FE CLK
VCO XTO
÷
64
f
50 k Ω
V
S
FSK/ASK
CDEM
AVCC
SENS
AGND
DGND
MIXVCC
LNAGND
LNA_IN
DATA
ENABLE
TEST
POUT
MODE
LFGND
LFVCC
XTO
LF
DVCC
LNA