U3742BM Datasheet, PDF (2/32 Pages) ATMEL Corporation – UHF ASK/FSK RECEIVER

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