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CHR2244
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).
T/R MOD WK_in
RF
Det
DATA_out SB_out
External components
Vcc
Transponder block diagram
Main Features
n n n 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
n n n
n n n
Main Characteristics
Tamb = +25C; Vcc = 3.1V
Symbol Vcc_sb_i RF_sb_p RF_dl_p BW_dl G_ul BW_ul Parameter 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 -39 -39 250 -6.5 0.1 -4 10 Min Typ 8 -43 -43 500 Max 14 Unit A dBm dBm kHz dB MHz
ESD Protections : Electrostatic discharge sensitive device observe handling precautions !
Ref. : DSCHR2244QDG5053 - 22 Feb 05
1/16
Specifications subject to change without notice
united monolithic semiconductors S.A.S.
Route Departementale 128 - B.P.46 - 91401 Orsay Cedex France Tel. : +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09
CHR2244
5.8 GHz One Antenna Reflective Tag
Electrical Characteristics (Full operating range) Tamb = -30C to +80C
Test Conditions (1) 50 2.7 6 10 T/R input port impedance Transmit to Receive recovery time 100 10 T/R_t (*) 150
Symbol Fop BW_rf RL_rf (*) Vcc WK_in_imp (*) T/R_imp (*)
Parameter Operating RF frequency range RF bandwidth RF input return loss Bias voltage WK_in port impedance
Min 5.725 50
Typ 5.8 12 3.1
Max 5.875 7 3.6
Unit GHz MHz dB V k pF k pF s
R/T_t (*) Receive to Transmit recovery time 50 s (1) The centre frequency can be adjusted by a matching network located between the antenna and the RF component. (*) Note : Min & Max values include technological spreads, supply & temperature range effect.
STANDBY mode : T/R=`0' , MOD=`0' , WK_in=`0'
Symbol SB_out_load SB_out_v (*) Parameter Standby output port load impedance Standby output port DC voltage high level (1) low level Amplitude modulation frequency of RF for wake-up Amplitude modulated RF input power for wake-up (2) Test Conditions Min 1 10 Vcc-1 0 250 -38 -43 Vcc 1 500 Typ Max Unit M pF V V kHz dBm A
RF_sb_bw RF_sb_p (*)
Vcc_sb_i (*) Standby DC current (3) 8 20 (1) The SB_out voltage is high when the RF input signal is AM modulated. (2) Total transmitted power of the modulated signal (modulation index = 0.5) (3) Without RF input signal (*) Note : Min & Max values include technological spreads, supply & temperature range effect.
Ref. : DSCHR2244QDG5053 - 22 Feb 05
2/16
Specifications subject to change without notice
Route Departementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09
5.8 GHz One Antenna Reflective Tag
DOWNLINK mode : T/R=`0' , MOD=`0' , WK_in=`Vcc'
Symbol Data_out_load Data_out_f Data_out_dc (*) RF_dl_p (*) Parameter Downlink output port load impedance Amplitude demodulation frequency Data_out signal duty cycle Amplitude modulated RF input power (1) Test Conditions Min
CHR2244
Typ Max Unit
CMOS compatible 250 40 -38 50 -43 500 60 kHz % dBm A
WK_in_i (*) WK_in DC current 200 500 (1) Total transmitted power of the modulated signal (modulation index = 0.5) (*) Note : Min & Max values include technological spreads, supply & temperature range effect.
UPLINK mode : T/R=`Vcc' , WK_in=`Vcc'
Symbol MOD_imp (*) MOD_v MOD_f G_ul (*) Parameter Modulated signal input port impedance Modulated signal input port voltage Uplink IF multiplier frequency Uplink multiplier gain (DSB) Square wave (1) 0.1 -7 -4 Test Conditions Min 100 10 0/Vcc 10 MHz dB A Typ Max Unit k pF
WK_in_i (*) WK_in DC current 200 500 (1) The shape of the modulated signal can be optimized if better linearity is needed. (*) Note : Min & Max values include technological spreads, supply & temperature range effect.
Absolute Maximum Ratings (1)
Tamb = -30C to +80C
Symbol Vcc Wk_in_v T/R_v MOD_v RF_sb_p RF_dl_p Top Bias voltage Wk_in input voltage T/R input voltage MOD input voltage Maximum Standby and Downlink RF input power (2) Operating temperature range Parameter Values 5 5 5 5 +10 -30 to +80 Unit V V V V dBm C
Tstg Storage temperature range -55 to +125 C (1) Operation of this device above anyone of these parameters may cause permanent damage. (2) Duration < 1s.
Ref. : DSCHR2244QDG5053 - 22 Feb 05
3/16
Specifications subject to change without notice
Route Departementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09
CHR2244
5.8 GHz One Antenna Reflective Tag
QFN-24 Package / Pad Allocation
Pin number 4, 5, 6, 8, 9, 10, 16, 18, 23, 24 1 2 3 7 11 12 13 14 15 17 19 20 21 22
Pin name
Description
Non Connected RF TR MOD SENS Vcc Ga_SB SB_out C4 DATA_out WK_in Ad Ga_WK Cg Fd
4/16
RF port Transmit / Receive input port Modulation input port Stand-by sensitivity adjust port Supply voltage Stand-by amplifiers Gain adjust port Stand-by output port External decoupling Downlink output port Supply voltage input port for wake-up Wake-up threshold adjust port Wake-up amplifiers Gain adjust port (optional) External decoupling External decoupling
Specifications subject to change without notice
Ref. : DSCHR2244QDG5053 - 22 Feb 05
Route Departementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09
5.8 GHz One Antenna Reflective Tag
25 slug GND Ground
CHR2244
Ref. : DSCHR2244QDG5053 - 22 Feb 05
5/16
Specifications subject to change without notice
Route Departementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09
CHR2244
External Components
5.8 GHz One Antenna Reflective Tag
united monolithic semiconductors
A Company of EADS Deutschland GmbH THALES
United Monolithic Semiconductors S.A.S. Route Departementale 128 B.P. 46 91401 ORSAY Cedex - France
Property of ums SAS. Distribution to third parties prohibited without consent. Propriete de ums SAS. Ne peut etre communique a des tiers sans autorisation.
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.
Ref. : DSCHR2244QDG5053 - 22 Feb 05 6/16 Specifications subject to change without notice
Route Departementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09
5.8 GHz One Antenna Reflective Tag
Design Recommendations
n n
CHR2244
All of the different inputs (TR, Mod) and outputs (SB_out, DATA_out) should be properly isolated (separated enough or with a ground path between them). As TR port is the most sensitive one, a specific circuit (see on diagram) can be used for high level of isolation.
n n
Device slug should be connected to RF ground plane through multiples vias (>=9). An external matching may be required to optimize RF performances on 50 impedance, versus substrate height. A RF ground plane height of 0.008" (0.203mm) under the component (evaluation board) provides the highest RF performances thanks to low RF ground inductance and low pin to pin coupling.
Adjustment abilities:
Pin number Pin name Component Description
Standby sensitivity adjust port : 7 SENS R3
A value lower than 2.2M decreases Standby chain sensitivity.
Standby amplifiers Gain adjust port :
12
Ga_SB
R4
A value lower than 680k increases Standby chain sensitivity.
Downlink threshold adjust port :
19
Ad
R5
A value lower than 6.8M decreases Downlink chain sensitivity.
Downlink amplifiers Gain adjust port :
20
Ga_WK
R6
A value lower than 220 k increases Downlink chain sensitivity.
IMPORTANT NOTICE : All this adjustments may cause non linear response of the performances versus resistors values. The sensitivity is -1x(Minimum RF power for considered mode).
Ref. : DSCHR2244QDG5053 - 22 Feb 05
7/16
Specifications subject to change without notice
Route Departementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09
CHR2244
5.8 GHz One Antenna Reflective Tag
Adjustment abilities characterization:
Typical performance, Tamb = +25C, Vcc = 3.1V n STANDBY sensitivity: The maximum value of R3 resistor is 2.2M. 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) >2.2 2.2 2.2 2.2 2.2 (*) 2.2 2.2 2.2 2.2 1.5 R4 (k) 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 (M) No Resistor No Resistor No Resistor No Resistor 6.8 (*) 4.7 3.3 2.2 1.5 1 R6 (k) 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 Departementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09
5.8 GHz One Antenna Reflective Tag
Frequency response characterization:
Typical performance, Tamb = +25C, Vcc = 3.1V, Recommended environment. n STANDBY sensitivity versus AM frequency :
CHR2244
0
-1,5
-3
Sensitivity (dBrel)
-4,5
-6
-7,5
-9
-10,5
-12 10 100 AM Frequency (kHz) 1000 10000
n
DOWNLINK sensitivity versus AM frequency :
0
-1,5
-3
Sensitivity (dBrel)
-4,5
-6
-7,5
-9
-10,5
-12 10 100 AM Frequency (kHz) 1000 10000
Ref. : DSCHR2244QDG5053 - 22 Feb 05
9/16
Specifications subject to change without notice
Route Departementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09
CHR2244
Evaluation board
5.8 GHz One Antenna Reflective Tag
Important notice / design recommendations:
Device slug should be connected to RF ground plane through multiples vias (>=9). An external matching may be required to optimize RF performances on 50 impedance, versus substrate height. A RF ground plane height of 0.008" (0.203mm) under the component (evaluation board) provides the highest RF performances thanks to low RF ground inductance and low pin to pin coupling.
Substrate = FR4 Metallic layers qty = 3 Thickness = 0.6mm + 0.2mm
united monolithic semiconductors
A Company of EADS Deutschland GmbH THALES
United Monolithic Semiconductors S.A.S. Route Departementale 128 B.P. 46 91401 ORSAY Cedex - France
Property of ums SAS. Distribution to third parties prohibited without consent. Propriete de ums SAS. Ne peut etre communique a des tiers sans autorisation.
Ref. : DSCHR2244QDG5053 - 22 Feb 05
10/16
Specifications subject to change without notice
Route Departementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09
5.8 GHz One Antenna Reflective Tag
Application Information
General Transmission system
CHR2244
The transmission system is described as follows, the tag doesn't generate any frequency :
Fo
DOWNLINK figure 1a
BEACON
F-AM
TAG
TRANSMIT MODE
RECEIVE MODE
Fo
UPLINK figure 1b
BEACON TAG
RECEIVE MODE
Fo Fm
TRANSMIT MODE
Figure 1 : Transmission system operating principle
Two modes of communication are implemented : From beacon to tag (figure 1a) : the beacon is in transmit mode while the tag is in the receive mode. The beacon sends an Amplitude Modulated (AM) RF signal to the tag. In figure 1a, F-AM is the amplitude modulation frequency and F0 is the carrier. From tag to beacon (figure 1b) : the beacon is in receive mode while the tag is in transmit mode. The beacon sends a continuous wave (CW) RF signal to the tag, this signal is then mixed ( at tag level ) with the MOD input signal (Fm) thanks to a reflective mixer. The reflected signal is sent back to the beacon and is demodulated thanks to an homodyne receiver.
Ref. : DSCHR2244QDG5053 - 22 Feb 05
11/16
Specifications subject to change without notice
Route Departementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09
CHR2244
Tag operating modes
5.8 GHz One Antenna Reflective Tag
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 (figure 2) 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 0V or HI MOD 0V or HI WK_in 0V or HI
RF-in AM modulated TR 0V
DATA_out RF in AM modulated
Det
WKIN 0V SB_out
SB_out to controller
Vcc
Figure 2a : Standby mode
The received AM modulated RF spectrum is the following, 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.
5.8GHz 5.8GHz 5.8GHz 7dB
-40dBm
12dB 9dB
5.7995GHz
5.8005GHz
5.7995GHz
5.8005GHz
5.7995GHz
5.8005GHz
m=0.5
m=0.7
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. : DSCHR2244QDG5053 - 22 Feb 05
12/16
Specifications subject to change without notice
Route Departementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09
5.8 GHz One Antenna Reflective Tag
CHR2244
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.
Data from controller T/R 0V MOD WK_in 0V Vcc
RF-in AM modulated TR 0V
DATA_out to controller RF in AM modulated
Det
WKIN 3V DATA_out
SB_out
Vcc
Figure 3a : Downlink mode
The received AM modulated RF spectrum is as in standby mode.
IF 500kHz
ATTENUATOR
MODULATOR
SB_OUT +V +WKIN
CHR2244
DATA_OUT
OSCILLOSCOPE
RF 5,8GHz
Figure 3b : Downlink test bench diagram
Ref. : DSCHR2244QDG5053 - 22 Feb 05
13/16
Specifications subject to change without notice
Route Departementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09
CHR2244
5.8 GHz One Antenna Reflective Tag
3 - In the UPLINK MODE (figure 4a), the received CW carrier (F0) is multiplied with the modulation signal (Fm) coming from MOD input. In fact, if ETSI CEN TC278 recommendation is applied, the modulation is around the sub-carrier Fm. The resulting reflected signal is a transposition of Fm around the carrier F0 (F0 Fm) .
Data from controller T/R Vcc RF in 5.8GHz CW modulated 2MHz subcarrier WK_in Vcc
RF-in
TR 3V WKIN 3V
CARRIER
DATA_out
Det
SB_out
RF out product of 5.8GHz X modulated sub-carrier
RF_out Spectrum
Vcc
modulated sub-carrier around carrier
Figure 4a : Uplink mode
ATTENUATOR
SPECTRUM ANALYSER
RF 5,8GHz
IF 500kHz +V
CHR2244
T/R MOD
Figure 4b : Uplink test bench diagram
Ref. : DSCHR2244QDG5053 - 22 Feb 05
14/16
Specifications subject to change without notice
Route Departementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09
5.8 GHz One Antenna Reflective Tag
4 - I/O configuration summary
T/R Standby 0V or High impedance WK_in 0V or High impedance RF_in AM signal SB_out >Vcc-1V
CHR2244
DATA_out
MOD
CW or no signal Downlink Uplink 0V Vcc Vcc Vcc Input : CW Output : Fm around the carrier AM : Amplitude Modulated CW : Continuous Wave
<1V CMOS Modulation signal (Fm)
Ref. : DSCHR2244QDG5053 - 22 Feb 05
15/16
Specifications subject to change without notice
Route Departementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09
CHR2244
5.8 GHz One Antenna Reflective Tag
Ordering Information
Package form : CHR2244-QDG/20
Information furnished is believed to be accurate and reliable. However United Monolithic Semiconductors S.A.S. assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of United Monolithic Semiconductors S.A.S.. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. United Monolithic Semiconductors S.A.S. products are not authorized for use as critical components in life support devices or systems without express written approval from United Monolithic Semiconductors S.A.S.
Ref. : DSCHR2244QDG5053 - 22 Feb 05
16/16
Specifications subject to change without notice
Route Departementale 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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