CHR2244-QDG_15 Datasheet, PDF (12/14 Pages) United Monolithic Semiconductors – 5.8 GHz One Antenna Reflective Transponder for Tag

CHR2244-QDG
5.8 GHz One Antenna Reflective Tag
2 - When the WK_in is set to Vcc (TR remaining at 0V), the CHR2244 switches to the DOWNLINK
MODE (figure 3a), allowing an optimized bandwidth for the demodulation. The received data is
demodulated and accessible at the DATA_out output.
Data from controller
T/R
MOD WK_in
0V
0V Vcc
RF in
Det
AM
modulated
DATA_out
to controller
RF-in
AM
modulated
T/R
0V
WK_in
3V
SB_out
DATA_out
Vcc
Figure 3a: Downlink mode
The received AM modulated RF spectrum is as in standby mode.
IF 500kHz
A TTE NUA TOR
MODUL A TO R
+V
+ W K _in
S B _OUT
CHR2244
OS CIL L OS CO PE
DAT A_OUT
RF
5 ,8 G Hz
Figure 3b: Downlink test bench diagram
Ref. : DSCHR2244-QDG9030 - 30 Jan 09
12/14
Specifications subject to change without notice
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