CHR2244

5.8 GHz One Antenna Reflective Tag

Ref. : DSCHR2244QDG5053 - 22 Feb 05

8/16

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

Adjustment abilities characterization:

Typical performance, Tamb = +25°C, Vcc = 3.1V

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STANDBY sensitivity:

The maximum value of R3 resistor is 2.2M

Ω. 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 (M

Ω)

R4 (k

Ω)

Sensitivity (dB)

>2.2

indifferently

Non guaranteed functionality

2.2

100

S + 1.5 dB

2.2

220

S + 1 dB

2.2

390

S + 0.5 dB

2.2 (*)

680 (*)

S (*)

2.2

1200

S - 0.5 dB

2.2

3300

S - 1.5 dB

2.2

6800

S - 3 dB

2.2

No Resistor

S - 4 dB

1.5

No Resistor

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.

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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 (M

Ω)

R6 (k

Ω)

Sensitivity (dB)

No Resistor

10

S + 2 dB

No Resistor

47

S + 1.5 dB

No Resistor

220

S + 1 dB

No Resistor

No Resistor

S + 0.5 dB

6.8 (*)

No Resistor (*)

S (*) (1)

4.7

No Resistor

S - 1 dB

3.3

No Resistor

S - 2 dB

2.2

No Resistor

S - 3 dB

1.5

No Resistor

S - 4 dB

1

No Resistor

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.