5.8 GHz One Antenna Reflective Tag

CHR2244

Ref. : DSCHR2244QDG5053 - 22 Feb 05

13/16

Specifications subject to change without notice

Route Départementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE

Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09

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.

Vcc

Det

T/R

0V

MOD

0V

WK_in

Vcc

DATA_out

to controller

RF in

AM

modulated

SB_out

Data from controller

TR

0V

WKIN

3V

DATA_out

RF-in

AM

modulated

Figure 3a : Downlink mode

The received AM modulated RF spectrum is as in standby mode.

IF 500kHz

RF

5,8GHz

MODULATOR

ATTENUATOR

CHR2244

+V

+WKIN

OSCILLOSCOPE

DATA_OUT

SB_OUT

Figure 3b : Downlink test bench diagram