CHR2244 Datasheet, PDF (13/16 Pages) United Monolithic Semiconductors – 5.8 GHz One Antenna Reflective Transponder for Tag GaAs Monolithic Microwave IC

5.8 GHz One Antenna Reflective Tag
CHR2244
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
TR
0V
WKIN
3V
SB_out
DATA_out
Vcc
Figure 3a : Downlink mode
The received AM modulated RF spectrum is as in standby mode.
IF 500kHz
ATTENUATOR
MODULATOR
+V
+WKIN
SB_OUT
CHR2244
OSCILLOSCOPE
DATA_OUT
RF
5,8GHz
Figure 3b : Downlink test bench diagram
Ref. : DSCHR2244QDG5053 - 22 Feb 05
13/16
Specifications subject to change without notice
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