TH71221_15 Datasheet, PDF (8/44 Pages) Melexis Microelectronic Systems – FSK/FM/ASK Transceiver

TH71221
27 to 930MHz
FSK/FM/ASK Transceiver
Pin No. Name I/O Type
17 FS0/SDEN input
18 VEE_DIG ground
19
FS1/LD input /
output
Functional Schematic
VCC
FS0/SDEN
17
120
VEE
FS1/LD
19
VCC
120
Description
frequency select input / seri-
al data enable input
ground of serial port and
control logic
frequency select input / lock
detector output
VEE
20 VCC_PLL analog I/O TNK_LO
21
VCC_PLL _{VCO open-collector output,}
6.3pF
VD
connection to VCC or exter-
20 _{nal LC tank}
VCC
21 TNK_LO analog I/O
LF
23
VEE
6.5k
VCC
VEE
VCO open-collector output,
connection to external LC
tank
VCOCUR
23
LF
analog I/O
120
charge pump output, con-
VEE
nection to external loop filter
22 VEE_PLL ground
24
PS_PA analog I/O
VEE
VCC
10µA
ground of PLL frequency
synthesizer
VCC
power-setting input
PS_PA
120
24
25 OUT_PA output
VEE
OUT_PA
25
VEE
VCC
1k
VEE
20p
VEE
power amplifier open-
collector output
39010 071221
Rev. 009
Page 8 of 44
Data Sheet
Nov/15