TH71221 Datasheet, PDF (32/44 Pages) Melexis Microelectronic Systems – 27 to 930MHz FSK/FM/ASK Transceiver

TH71221
27 to 930MHz
FSK/FM/ASK Transceiver
7.2 FSK Application Circuit Stand-alone User Mode
RX_IN
TX_OUT
CF2
CB2
RPS
LTX0
CTX4
CF1
RF _CB6
C0
L0
see para. 4.1.1
CTX0
Combining
network
CRX0
C2
L1
C1
CB1
RB1
25 _{OUT_PA}
26 IN_LNA
27 VEE_LNA
16
RE/SCLK 15
VCC_DIG 14
TX
enable
RX
CB7 ^enable
28 OUT_LNA
29 GAIN_LNA
30 IN_MIX
TH71221
32L QFN 5x5
ASK/FSK 13
IN_DTA 12
FSK_SW 11
FSK
CX2 ^input
31 VEE_IF
OUT_MIX
32
12
CB5
34 5
C3
67
C4
RO 10
9
XTAL ^CX1
VEE_RO
8
RSSI
FSK
output
C5
CB0
RP
CB4
VCC
Fig. 15: Test circuit for FSK operation in Stand-alone User Mode
39010 071221
Rev. 005
Page 32 of 44
Data Sheet
June/07