5.8 GHz One Antenna Reflective Tag
CHR2244
Adjustment abilities characterization:
Typical performance, Tamb = +25°C, Vcc = 3.1V
n
STANDBY sensitivity:
The maximum value of R3 resistor is 2.2MW. It could be used in order to reduce the Standby sensitivity.
The R4 resistor should be used to set the Standby sensitivity higher or lower. The following table gives
the typical relation between R3, R4 and the Standby sensitivity.
Sensitivity (dB)
Non guaranteed functionality
S + 1.5 dB
R3 (MW)
>2.2
2.2
R4 (kW)
indifferently
100
2.2
220
S + 1 dB
2.2
390
S + 0.5 dB
2.2 (*)
2.2
680 (*)
1200
S (*)
S - 0.5 dB
2.2
3300
S - 1.5 dB
2.2
6800
S - 3 dB
2.2
1.5
No Resistor
No Resistor
S - 4 dB
S - 5 dB
(*) S is the sensitivity of a given chip in the recommended environment.
In the full operating range and the recommended environment, -|S| < -38 dBm in accordance with the
electrical characteristics.
n
DOWNLINK sensitivity:
R5 could be used in order to reduce the Downlink sensitivity or to set the compromise between
sensitivity and unwanted data, when no RF signal, due to noise or parasitic coupling. The R6 resistor
should be used to set the Downlink sensitivity higher or lower. The following table gives the typical
relation between R5, R6 and the Downlink sensitivity.
Sensitivity (dB)
S + 2 dB
S + 1.5 dB
S + 1 dB
S + 0.5 dB
S (*) (1)
R5 (MW)
No Resistor
No Resistor
No Resistor
No Resistor
6.8 (*)
R6 (kW)
10
47
220
No Resistor
No Resistor (*)
No Resistor
No Resistor
No Resistor
No Resistor
No Resistor
4.7
3.3
2.2
1.5
S - 1 dB
S - 2 dB
S - 3 dB
S - 4 dB
1
S - 5 dB
(*) S is the sensitivity of a given chip in the recommended environment.
In the full operating range and the recommended environment, -|S| < -38 dBm in accordance with the
electrical characteristics.
(1) A higher sensitivity than in recommended configuration may cause significant density of unwanted data
when RF is not modulated.
These data are random because of the component noise floor proximity, or can be sensitive to an
environment perturbation.
Ref. : DSCHR2244QDG5053 - 22 Feb 05
8/16
Specifications subject to change without notice
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UMS [ UNITED MONOLITHIC SEMICONDUCTORS ]
