CHR2244 Datasheet, PDF (8/16 Pages) United Monolithic Semiconductors – 5.8 GHz One Antenna Reflective Transponder for Tag GaAs Monolithic Microwave IC

CHR2244
5.8 GHz One Antenna Reflective Tag
Adjustment abilities characterization:
Typical performance, Tamb = +25°C, Vcc = 3.1V
n STANDBY sensitivity:
The maximum value of R3 resistor is 2.2MΩ. 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.
R3 (MΩ)
>2.2
2.2
2.2
2.2
2.2 (*)
2.2
2.2
2.2
2.2
1.5
R4 (kΩ)
indifferently
100
220
390
680 (*)
1200
3300
6800
No Resistor
No Resistor
Sensitivity (dB)
Non guaranteed functionality
S + 1.5 dB
S + 1 dB
S + 0.5 dB
S (*)
S - 0.5 dB
S - 1.5 dB
S - 3 dB
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.
R5 (MΩ)
No Resistor
No Resistor
No Resistor
No Resistor
6.8 (*)
4.7
3.3
2.2
1.5
1
R6 (kΩ)
10
47
220
No Resistor
No Resistor (*)
No Resistor
No Resistor
No Resistor
No Resistor
No Resistor
Sensitivity (dB)
S + 2 dB
S + 1.5 dB
S + 1 dB
S + 0.5 dB
S (*) (1)
S - 1 dB
S - 2 dB
S - 3 dB
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.
(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
Route Départementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE
Tel.: [phone] - Fax : [phone]