5.8 GHz One Antenna Reflective Tag
CHR2244-QDG
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
0V
MOD WK_in
0V Vcc
RF-in
AM
modulated
T/R
0V
DATA_out
to controller
WK_in
3V
Det
SB_out
DATA_out
RF in
AM
modulated
Vcc
Figure 3a: Downlink mode
The received AM modulated RF spectrum is as in standby mode.
IF 500kHz
ATTENUATOR
MODULATOR
SB_OUT
+V
OSCILLOSCOPE
CHR2244
RF
5,8GHz
+WK_in
DATA_OUT
Figure 3b: Downlink test bench diagram
Ref. : DSCHR2244-QDG9030 - 30 Jan 09
12/14
Specifications subject to change without notice
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Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09
UMS [ UNITED MONOLITHIC SEMICONDUCTORS ]
