TH71111
868/915MHz
FSK/FM/ASK Receiver
2
Pin Definitions and Descriptions
Pin No.
Name
I/O Type
Functional Schematic
Description
OUT_LNA
3
OUT_LNA
analog
output
LNA open-collector output,
to be connected to external
LC tank that resonates at
RF
3
5k
IN_LNA
31
31
1
IN_LNA
analog
input
LNA input, approx.
26Ω single-ended
VEE_LNAC
1
VEE_LNAC ground
ground of LNA core (cas-
code)
2
GAIN_LNA analog
input
LNA gain control
(input with hysteresis)
GAIN_LNA
400
Ω
RX standby: no pull-up
RX active: pull-up
2
4
IN_MIX1
analog
input
MIX1 input, approx. 33Ω
single-ended
13Ω
IN_MIX1
4
13Ω
500µA
5
6
VEE_MIX
IF1P
ground
ground of MIX1 and MIX2
open-collector output, to be
connected to external LC
tank that resonates at first IF
VCC
analog I/O
IF1N
20p
20p
IF1P
6
7
7
IF1N
analog I/O
open-collector output, to be
connected to external LC
tank that resonates at first IF
2x500µA
VEE
VEE
8
9
VCC_MIX
supply
positive supply of
MIX1 and MIX2
OUT_MIX2 analog
output
MIX2 output, approx. 330Ω
output impedance
6.8k
OUT_MIX2
9
130
Ω
230µA
10
VEE_IF
ground
ground of IFA and DEMOD
39010 71111
Rev. 013
Page 6 of 22
Data Sheet
June/07
MELEXIS [ Melexis Microelectronic Systems ]
