U3741BM Datasheet, PDF (2/32 Pages) ATMEL Corporation – UHF ASK RECEIVER IC

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