TH71221 Datasheet, PDF (36/44 Pages) Melexis Microelectronic Systems – 27 to 930MHz FSK/FM/ASK Transceiver

TH71221
27 to 930MHz
FSK/FM/ASK Transceiver
7.6 ASK Application Circuit Programmable User Mode (peak detector option)
CF2 ^CF1
RX_IN
TX_OUT
CB2
LTX0
CTX0
Combining
network
CRX0
C2
L1
C1
CB1
RB1
CTX4
RF _CB6
C0
L0
Lock
detect
25 _{OUT_PA}
26 IN_LNA
27 VEE_LNA
16
RE/SCLK 15
VCC_DIG 14
SDEN
SDTA
SCLK
CB7
3wire bus
28 OUT_LNA
29 GAIN_LNA
30 IN_MIX
TH71221
32L QFN 5x5
ASK/FSK 13
IN_DTA 12
FSK_SW 11
ASK
input
31 VEE_IF
RO 10
32 ^OUT_MIX
12 345 6 78
9
XTAL ^CX1
VEE_RO
R1 R2
CB5
RSSI
ASK
output
C6
C5
CB0
VCC
Fig. 17: Test circuit for ASK operation in Programmable User Mode (internal Peak Detector option)
Software Settings for ASK
Channel
frequency
RR
315.00 MHz
80
434.00 MHz
80
915.00 MHz
80
f_RO = 8.0000MHz
NR
RT
3043
8
4233
8
9043
8
CPCUR
VCOCUR
NT
RX
TX
RX
TX
315
260µA 1300µA 300 µA 900µA
434
260µA 1300µA 300 µA 900µA
915
260µA 1300µA 300 µA 900µA
39010 071221
Rev. 005
Page 36 of 44
Data Sheet
June/07