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TH71112
868/915MHz
FSK/ASK Receiver
Pin No.
21
Name
RSSI
I/O Type
analog
Functional Schematic
Description
RSSI output, for RSSI and
output
RSSI
50 ?
I (Pi)
ASK detection, approx.
36k ? output impedance
21
36k
22
VEE_BIAS
ground
ground of general
bias system and OA
23
OUTP
analog
output
OUTP
OUTN
50 ?
FSK positive output, output
impedance of 100k ? to
300k ?
24
OUTN
analog
output
23
24
20μA
20μA
FSK negative output, output
impedance of 100k ? to
300k ?
25
VEE_RO
ground
ground of DIV, PFD, RO
and charge pump
26
RO
analog
RO input, Colpitts type
input
RO
26
50k
30p
oscillator with internal feed-
back capacitors
30p
27
VCC_PLL
supply
positive supply of DIV, PFD,
RO and charge pump
28
ENRX
digital
input
ENRX
1.5k
mode control input,
CMOS-compatible with
internal pull-down circuit
28
29
LF
analog I/O
charge pump output and
VCO1 control input
LF
200 ?
29
400 ?
4p
30
32
VEE_LNA
VCC_LNA
ground
supply
ground of LNA biasing
positive supply of
LNA biasing
39010 71112
Rev. 016
Page 8 of 20
Data Sheet
Jun/12
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