TH72011
433MHz
FSK Transmitter
3 Pin Definition and Description
Pin No.
1
Name
FSKDTA
I/O Type
input
FSKDTA
1
1.5k
Ω
Functional Schematic
0: ENTX=1
1: ENTX=0
Description
FSK data input,
CMOS compatible with op-
eration mode dependent
pull-up circuit
TX standby: no pull-up
TX active: pull-up
XOSC FSK pulling pin,
MOS switch
2
FSKSW
analog I/O
FSKSW
2
3
ROI
analog I/O
25k
ROI
3
36p
XOSC connection to XTAL,
Colpitts type crystal oscilla-
tor
36p
4
ENTX
input
ENTX
4
1.5k
Ω
mode control input,
CMOS-compatible with in-
ternal pull-down circuit
5
PSEL
analog I/O
I
PSEL
1.5k
Ω
power select input, high-
impedance comparator logic
PSEL
5
TX standby: I
PSEL
= 0
TX active: I
PSEL
= 8µA
6
7
VCC
OUT
supply
output
OUT
7
VCC
positive power supply
power amplifier output,
open collector
VEE
VEE
8
VEE
ground
negative power supply
39010 72011
Rev. 008
Page 7 of 20
Data Sheet
June /07
MELEXIS [ Melexis Microelectronic Systems ]
