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PDF CHR2244-QDG Data sheet ( Hoja de datos )

Número de pieza CHR2244-QDG
Descripción GaAs Monolithic Microwave IC
Fabricantes United Monolithic Semiconductors 
Logotipo United Monolithic Semiconductors Logotipo



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CHR2244-QDG
RoHS COMPLIANT
5.8 GHz One Antenna Reflective Transponder for Tag
GaAs Monolithic Microwave IC
Description
The CHR2244 is a MMIC transponder dedicated to
short range communications at 5.8GHz. It includes
all the RF functions for bi-directional transmission
and CMOS compatible interfaces. Only one
antenna is necessary.
Three modes are implemented:
STANDBY: ultra low current AM detector, with a
reduced bandwidth, providing a wake-up signal on
SB_out output. This signal is a DC voltage. This
output is active when and only when an AM
modulated RF signal is applied to the RF input.
DOWNLINK: low current AM detector, with
optimized IF bandwidth, providing the demodulated
data at the CMOS compatible DATA_out output.
UPLINK: multiplier based on a passive reflective
mixer.
This circuit is manufactured on a MESFET
process. It is supplied in plastic package (QFN-24).
Main Features
5.8GHz ISM band operating frequency
CMOS compatible
Ultra low standby current
Integrated wake-up circuit
High detection sensitivity for downlink
Reflective multiplier for uplink
Single bias voltage
Low cost & high performances plastic package
Lead-free, Matt Tin (Green) solder plating
T/R MOD WK_in
RF
Det
DATA_out
SB_out
External components Vcc
Transponder block diagram
Main Characteristics
Tamb = +25°C; Vcc = 3.1V
Symbol
Parameter
Min Typ Max
Vcc_sb_i
RF_sb_p
RF_dl_p
BW_dl
G_ul
BW_ul
Standby DC current ( Without RF input
signal)
Minimum power for Standby mode
Minimum power for Downlink mode
AM demodulation frequency (Downlink)
Uplink multiplier gain (DSB)
Uplink IF multiplier frequency band
8 14
-39 -43
-39 -43
250 500
-6.5 -4
0.1 10
ESD Protections : Electrostatic discharge sensitive device observe handling precautions !
Unit
µA
dBm
dBm
kHz
dB
MHz
Ref. : DSCHR2244-QDG9030 - 30 Jan 09
1/14
Specifications subject to change without notice
united monolithic semiconductors S.A.S.
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

1 page




CHR2244-QDG pdf
5.8 GHz One Antenna Reflective Tag
CHR2244-QDG
External Components
Important notice
All the components placed in the “EVAL BOARD” area are optional.
Other components make up the nominal environment where the specifications are guaranteed.
Design Recommendations
Ref. :DSCHR2244-QDG9030 - 30 Jan 09
5/14
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

5 Page





CHR2244-QDG arduino
5.8 GHz One Antenna Reflective Tag
CHR2244-QDG
Tag operating modes
Within this transmission system, the CHR2244 operates in three basic modes depending on the WK_in
and T/R input signal levels. They are described hereafter:
1 - The STANDBY MODE (figures 2a; 2B and 2c) is a very low power consumption state. In this mode
an Amplitude Modulated RF signal is necessary to produce a DC voltage at the SB_out output which
may be used to wake-up the CHR2244 by applying Vcc to the WK_in input.
Data from controller
T/R MOD
0V or HI 0V or HI
WK_in
0V or HI
RF in
AM
modulated
Det
RF-in
AM
modulated
T/R
0V
DATA_out
WK_in
0V
SB_out
SB_out
to controller
Vcc
Figure 2a: Standby mode
The received AM modulated RF spectrum is the following (figure 2b), versus the modulation index (m).
This plot is done for the minimum AM modulated RF input power ( -40 dBm ) and only for an ideal
spectrum with only 2 rows ( 5.7995 and 5.8005 GHz ) i.e. the 5.8 GHz carrier AM modulated with a 500
kHz signal.
-40dBm
5.8GHz
12dB
5.8GHz
9dB
5.8GHz
7dB
5.79 95GHz
5.80 05GHz
m=0.5
5.79 95GHz
5.80 05GHz
m=0.7
5.7995GHz
5.80 05GHz
m=0.9
Figure 2b: AM modulated RF spectrum
IF 500kHz
ATTENUATOR
MODULATOR
SB_OUT
+V
CHR2244
OSCILLOSCOPE
RF
5,8GHz
Figure 2c: Standby test bench diagram
Ref. :DSCHR2244-QDG9030 - 30 Jan 09
11/14
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

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