TH71221 Datasheet, PDF (6/44 Pages) Melexis Microelectronic Systems – 27 to 930MHz FSK/FM/ASK Transceiver

TH71221
27 to 930MHz
FSK/FM/ASK Transceiver
2 Pin Definitions and Descriptions
Pin No. Name
1
IN_IFA
I/O Type
input
2
VCC_IF supply
Functional Schematic
VCC
VCC
IN_IFA
1
50
VEE
2.2k
140µA
VEE
3
IN_DEM analog I/O
4 INT2/PDO output
VCC
IN_DEM
3
VEE
90k
60k
1.5p
10µA
VCC
INT2/PDO
4
VCC
100µA
VEE
Description
IF amplifier input, approx.
2 kΩ single-ended
positive supply of LNA, MIX,
IFA, FSK Demodulator, PA,
OA1 and OA2
IF amplifier output and de-
modulator input, connection
to external ceramic discrimi-
nator or LC tank
OA2 output or peak detector
output, high impedance in
transmit and idle mode
5
INT1
input
VEE
VCC
200k
VCC
inverting inputs of OA1 and
OA2
+
INT1
120
OA1
5
OUT_DEM
6 OUT_DEM analog I/O
VEE
bias
OA2
VCC
1k
6 ^{demodulator output and}
non-inverting OA1 input,
high impedance in transmit
and idle mode
10p
10p
VEE
7
RSSI
output
VCC
VCC
RSSI output, approx. 33 kΩ
5µA
RSSI
120
7
VEE
5µA
VEE
39010 071221
Rev. 005
Page 6 of 44
Data Sheet
June/07