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CHT4690-QAG
RoHS COMPLIANT
5-30GHz ATTENUATOR
GaAs Monolithic Microwave IC in SMD leadless package Description
The CHT4690-QAG is a variable 5-30GHz attenuator designed for a wide range of applications, from military to commercial communication systems. The circuit is manufactured with a MESFET process, 0.7m gate length, via holes through the substrate and air bridges. It is supplied in lead-free package.
Attenuation versus frequency & V1, V2
dB
Main Features
Broadband performance: 5-30GHz 25dBm typical input 1dB compression point (Any attenuation) 30dB dynamic range DC bias : -5VMain Characteristics
Temp. = 25 C Symbol
Fin Min Att. Max Att. Pin1dB
Parameter
Input frequency range |S21| (V1=-5V;V2=-5V) (10 to 24GHz) |S21| (V1=0V;V2=0V) (10 to 30GHz) Input 1dB compression point (any attenuation)
Min
5
Typ
Max
30
Unit
GHz dB dB dBm
-4 -35 25
ESD Protection: Electrostatic discharge sensitive device. Observe handling precautions!
Ref. : CHT4690QAG6332 - 28 Nov 06 1/14 Specifications subject to change without notice
United Monolithic Semiconductors S.A.S.
Route Departementale 128 - BP46 - 91401 Orsay Cedex France Tel.: +33 (0) 1 69 33 03 08 - Fax: +33 (0) 1 69 33 03 09
DC-30GHz Attenuator
Electrical Characteristics
Temp. = 25 C Symbol
Fin Min Att. Input frequency range |S21| (V1=-5V;V2=-5V) (5 to 10GHz) |S21| (V1=-5V;V2=-5V) (11 to 24GHz) |S21| (V1=-5V;V2=-5V) (25 to 30GHz) Max Att. |S21| (V1=0V;V2=0V) (5 to 10GHz) |S21| (V1=0V;V2=0V) (11 to 30GHz) VSWRin Input VSWR (any attenuation) (5 to 26GHz)
CHT4690-QAG
Parameter
Min
5
Typ
Max
30
Unit
GHz dB dB dB dB dB
-2 -4 -6 -22 -28 -24 -35 2.0:1 2.5:1 24 36 -5 25 40
-3 -5.5 -7.5
VSWRout Output VSWR (any attenuation) (6 to 26GHz) Pin1dB C/I3 V1,V2 Input 1dB compression point (any attenuation) (5 to 25GHz) C/I3 @ Pin/tone=12dBm (any attenuation) (to 26GHz) Voltage control range
dBm dB 0 V
These values are representative of onboard measurements as defined on the drawing 96272 (see below). ESD Protection: Electrostatic discharge sensitive device. Observe handling precautions!
Absolute Maximum Ratings (1)
Temp. = 25 C Symbol V1 V2 Pin Ta Tstg (1) V1 control voltage V2 control voltage RF input power Operating temperature range (reference on ground paddle) Storage temperature range Parameter Values -6V -6V 30 -40 to +85 -55 to +155 Unit V V dBm C C
Operation of this device above anyone of these parameters may cause permanent damage.
Typical Bias Conditions
at roomTemperature +25 C Symbol V1 Pin No. 6 V1 control voltage Parameter Values -5 to 0 Unit V V
V2 7 V2 control voltage -5 to 0 All other pins are not used for this device (but RFin: pin 3 and RFout: pin 10).
Ref. : CHT4690QAG6332 - 28 Nov 06 2/14
Specifications subject to change without notice
Route Departementale 128, BP46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0) 1 69 33 03 08 - Fax: +33 (0) 1 69 33 03 09
CHT4690-QAG
Typical Sij results
DC-30GHz Attenuator
Temp. = +25 C Refer to the "definition of the Sij reference planes" section below V1 = -5V & V2= -5V - Minimum attenuation
Freq GHz 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 dBS11 dB -5,77 -18,24 -33,75 -18,99 -15,80 -14,81 -14,79 -15,94 -17,99 -17,54 -13,70 -12,17 -11,15 -12,30 -15,11 -21,56 -30,69 -28,59 -32,47 -34,58 -27,02 -25,65 -14,56 -11,52 -11,89 -13,87 -15,40 -11,70 -7,47 -5,43 -4,86 -5,41 -9,51 -12,43 -6,67 -3,78 -2,85 -2,31 -2,25 PhS11 -130,20 162,60 -0,66 -62,49 -101,90 -134,70 -163,60 172,70 164,40 178,10 167,20 146,50 119,70 86,70 52,00 13,96 -31,65 -144,80 147,50 -83,05 -107,30 -58,89 -81,43 -119,30 -145,10 -157,20 -137,70 -124,90 -137,50 -163,20 173,10 146,80 122,00 169,50 164,80 142,10 120,90 103,00 84,05 dBS12 dB -2,55 -1,56 -1,05 -1,27 -1,53 -1,74 -1,99 -2,20 -2,29 -2,49 -2,76 -3,17 -3,37 -3,08 -2,82 -2,74 -2,82 -2,88 -2,98 -3,35 -3,64 -3,67 -4,08 -4,83 -5,32 -5,49 -5,52 -5,87 -6,63 -7,15 -7,59 -7,96 -7,74 -8,22 -8,15 -9,68 -11,55 -12,30 -12,06 PhS12 -31,72 -76,14 -121,10 -162,60 159,00 120,90 83,83 47,44 10,91 -26,01 -62,82 -98,13 -130,70 -164,50 159,70 123,00 86,43 50,32 13,16 -24,26 -59,80 -97,53 -138,10 -177,20 145,60 107,70 67,12 24,50 -15,21 -52,23 -88,55 -125,00 -160,70 159,30 120,10 77,59 46,82 21,67 -4,80 dBS21 dB -2,56 -1,57 -1,05 -1,28 -1,55 -1,75 -1,99 -2,21 -2,31 -2,51 -2,77 -3,19 -3,37 -3,09 -2,81 -2,77 -2,81 -2,88 -2,99 -3,36 -3,65 -3,68 -4,07 -4,84 -5,35 -5,46 -5,53 -5,88 -6,63 -7,16 -7,57 -7,97 -7,75 -8,21 -8,13 -9,65 -11,57 -12,29 -12,05 PhS21 -31,77 -76,09 -121,00 -162,70 158,90 121,00 83,88 47,39 10,87 -26,06 -62,74 -98,10 -130,60 -164,40 159,70 122,80 86,37 50,19 13,04 -24,34 -59,89 -97,70 -138,50 -177,50 145,70 107,70 66,95 24,46 -15,33 -52,16 -88,62 -125,30 -160,80 159,30 119,90 77,40 47,05 21,81 -5,05 dBS22 dB -6,02 -16,23 -28,33 -17,03 -14,97 -14,59 -15,92 -18,83 -20,83 -16,58 -12,70 -10,52 -9,67 -10,23 -12,39 -15,62 -22,70 -23,35 -28,06 -22,49 -17,98 -15,16 -11,33 -8,30 -7,08 -7,17 -8,14 -8,03 -6,28 -4,96 -4,23 -5,17 -6,42 -6,74 -7,16 -4,40 -2,89 -2,40 -2,35 PhS22 -122,20 -159,80 -61,76 -83,44 -123,50 -163,60 150,90 93,77 8,96 -75,82 -127,80 -167,80 157,20 120,20 89,50 59,38 53,56 49,99 52,01 52,93 14,05 -14,18 -37,63 -68,74 -96,79 -120,00 -131,80 -132,80 -139,50 -153,40 -172,40 167,20 164,50 152,80 159,50 153,60 134,90 116,80 99,67
Ref. : CHT4690QAG6332 - 28 Nov 06
3/14
Specifications subject to change without notice
Route Departementale 128, BP46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0) 1 69 33 03 08 - Fax: +33 (0) 1 69 33 03 09
DC-30GHz Attenuator
V1 = 0V & V2= 0V - Maximum attenuation
Freq GHz 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 dBS11 dB -4,58 -7,66 -10,04 -11,79 -13,15 -13,93 -14,30 -14,51 -14,69 -15,36 -15,66 -16,00 -16,07 -16,04 -15,58 -14,97 -14,41 -14,10 -13,91 -14,02 -14,48 -14,56 -14,08 -13,59 -12,69 -11,18 -10,24 -9,49 -9,05 -8,24 -7,73 -7,12 -7,28 -7,33 -7,18 -7,17 -7,32 -7,32 -7,28 PhS11 -164,60 152,60 125,10 106,80 92,84 83,62 74,01 62,94 50,17 36,83 19,40 -1,97 -25,88 -50,59 -74,18 -95,76 -114,50 -129,00 -141,20 -150,70 -156,50 -155,60 -157,40 -156,60 -155,60 -159,80 -166,20 -174,10 177,40 169,60 158,70 146,60 132,60 122,70 112,10 100,40 91,06 83,47 75,23 dBS12 dB -18,83 -20,15 -22,05 -24,07 -25,94 -27,50 -28,73 -29,57 -30,02 -30,34 -30,51 -30,52 -30,75 -30,52 -30,43 -31,02 -31,05 -31,54 -32,25 -33,24 -33,48 -34,63 -36,28 -39,81 -42,40 -43,51 -48,88 -38,50 -37,50 -36,97 -37,26 -40,29 -43,01 -36,51 -34,73 -34,58 -33,21 -32,28 -32,57 PhS12 -43,68 -106,60 -156,40 159,40 120,10 81,83 45,60 11,40 -20,80 -52,88 -84,12 -115,70 -147,80 -176,60 152,20 124,00 98,24 69,96 43,99 15,69 -1,81 -31,43 -54,07 -82,06 -102,50 -159,90 115,70 48,99 -8,61 -33,24 -61,32 -100,10 -79,19 -71,50 -122,50 -154,40 174,60 135,30 101,40 dBS21 dB -18,87 -20,15 -22,01 -24,02 -26,08 -27,53 -28,64 -29,38 -30,21 -30,36 -30,19 -30,43 -30,77 -30,41 -30,14 -31,02 -30,67 -31,22 -31,96 -33,43 -33,39 -34,36 -36,96 -40,15 -41,47 -43,00 -48,73 -39,12 -37,33 -36,66 -36,88 -40,91 -42,57 -36,30 -35,16 -34,46 -32,59 -32,07 -32,78
CHT4690-QAG
PhS21 -43,73 -106,10 -156,00 158,80 119,30 82,42 46,65 11,36 -21,85 -52,20 -84,48 -117,50 -147,00 -174,50 152,40 120,70 100,30 69,87 42,11 17,32 1,40 -32,15 -57,05 -79,86 -100,20 -166,90 104,20 48,98 -6,80 -31,20 -63,10 -102,40 -80,83 -73,28 -125,70 -157,00 173,20 131,80 105,50 dBS22 dB -2,67 -4,26 -5,39 -6,30 -7,03 -7,74 -8,37 -8,98 -9,58 -10,35 -10,98 -11,49 -11,91 -12,25 -12,33 -12,29 -12,01 -11,72 -11,36 -11,07 -10,67 -10,37 -9,91 -9,65 -9,37 -8,98 -8,75 -8,56 -8,31 -8,16 -8,13 -8,02 -7,87 -7,15 -7,61 -8,13 -8,04 -7,60 -7,70 PhS22 -145,10 173,60 143,20 118,80 98,09 79,64 62,86 47,10 32,09 17,49 2,35 -13,07 -28,88 -44,35 -59,58 -73,43 -86,90 -99,34 -110,20 -120,00 -128,10 -135,30 -143,00 -149,40 -155,30 -161,40 -168,00 -175,10 178,00 170,50 162,70 154,70 147,80 135,70 122,30 115,00 108,70 99,93 90,76
Ref. : CHT4690QAG6332 - 28 Nov 06
4/14
Specifications subject to change without notice
Route Departementale 128, BP46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0) 1 69 33 03 08 - Fax: +33 (0) 1 69 33 03 09
CHT4690-QAG
Typical Results
Temp. = +25 C
DC-30GHz Attenuator
Measurements in the package access, using the proposed land pattern & board 96272, as defined page 11. Attenuation versus frequency
V1 = -5V to 0V & V2= -5V and after V1= 0V & V2 = -5V to 0V
Ref. : CHT4690QAG6332 - 28 Nov 06
5/14
Specifications subject to change without notice
Route Departementale 128, BP46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0) 1 69 33 03 08 - Fax: +33 (0) 1 69 33 03 09
DC-30GHz Attenuator
CHT4690-QAG
Input Return loss versus frequency in total attenuation range
Output Return loss versus frequency in total attenuation range
Ref. : CHT4690QAG6332 - 28 Nov 06
6/14
Specifications subject to change without notice
Route Departementale 128, BP46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0) 1 69 33 03 08 - Fax: +33 (0) 1 69 33 03 09
CHT4690-QAG
0 -5 -10 -15 Attenuation (dB) -20 -25 -30 -35 -40 V1 variable with V2=-5V -45 -50 -5,0 V2 variable with V1= 0V
DC-30GHz Attenuator
Attenuation control at 5GHz
-4,5
-4,0
-3,5
-3,0
-2,5
-2,0
-1,5
-1,0
-0,5
0,0
Voltage V1 or V2 (V)
Attenuation control at 15GHz
0 -5 -10 -15 Attenuation (dB) -20 -25 -30 -35 -40 -45 -50 -5,0 V1 variable with V2=-5V V2 variable with V1= 0V
-4,5
-4,0
-3,5
-3,0
-2,5
-2,0
-1,5
-1,0
-0,5
0,0
Voltage V1 or V2 (V)
Ref. : CHT4690QAG6332 - 28 Nov 06
7/14
Specifications subject to change without notice
Route Departementale 128, BP46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0) 1 69 33 03 08 - Fax: +33 (0) 1 69 33 03 09
DC-30GHz Attenuator
Attenuation control at 25GHz
0 -5 -10 -15 Attenuation (dB) -20 -25 -30 -35 -40 -45 -50 -5,0 V1 variable with V2=-5V V2 variable with V1= 0V -4,5 -4,0 -3,5 -3,0 -2,5 -2,0
CHT4690-QAG
-1,5
-1,0
-0,5
0,0
Voltage V1 or V2 (V)
Attenuation versus input power @ 15GHz
V1 = -5V to 0V & V2= -5V and after V1= 0V & V2 = -5V to 0V
Ref. : CHT4690QAG6332 - 28 Nov 06
8/14
Specifications subject to change without notice
Route Departementale 128, BP46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0) 1 69 33 03 08 - Fax: +33 (0) 1 69 33 03 09
CHT4690-QAG
DC-30GHz Attenuator
Input IP3 versus input power
V1 = -3.5V & V2= -5V (worst case area for the linearity)
45
40
Input IP3 dBm
35
30 24GHz 20GHz 15GHz 10GHz 6GHz
25
20 -2 0 2 4 6 8 10 12 14 16 18 20 22 Single input power dBm
C/I3 versus input power V1 = -3.5V & V2= -5V (worst case area for the linearity)
60
55
50 24GHz 20GHz 15GHz 10GHz 6GHz C/I3 dB
45
40
35
30 -2 0 2 4 6 8 10 12 14 16 18 20 22 Single input power dBm
Ref. : CHT4690QAG6332 - 28 Nov 06
9/14
Specifications subject to change without notice
Route Departementale 128, BP46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0) 1 69 33 03 08 - Fax: +33 (0) 1 69 33 03 09
DC-30GHz Attenuator
Package outline:
CHT4690-QAG
Ref. : CHT4690QAG6332 - 28 Nov 06
10/14
Specifications subject to change without notice
Route Departementale 128, BP46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0) 1 69 33 03 08 - Fax: +33 (0) 1 69 33 03 09
CHT4690-QAG
Definition of the Sij reference planes
The reference planes are defined from the footprint of the recommended characterization board 95542 shown below. The reference is the symmetrical axis of the package. The input and output reference planes are located at 2.65mm offset (input wise and output wise respec.) from this axis. Then, the given Sij incorporates this land pattern.
DC-30GHz Attenuator
2.65
2.65
Application note
The design of the motherboard has a strong impact on the over all performance since the transition from the motherboard to the package is comparably large. In case of the SMD type packages of United Monolithic Semiconductors the motherboard should be designed according to the information given in the following to achieve good performance. Other configurations are also possible but can lead to different results. If you need advise please contact United Monolithic Semiconductors for further information. SMD type packages of UMS should allow design and fabrication of micro- and mm-wave modules at low cost. Therefore, a suitable motherboard environment has been chosen. All tests and verifications have been performed on Rogers RO4003. This material exhibits a permittivity of 3.38 and has been used with a thickness of 200m [8 mils] and a 1/2oz or less copper cladding. The corresponding 50Ohm transmission line has a strip width of about 460m [approx. 18 mils]. The contact areas on the motherboard for the package connections should be designed according to the footprint given below. The proper via structure under the ground pad is very important in order to achieve a good RF and lifetime performance. All tests have been done by using a grid of plated through vias with a diameter of less than 300m [12 mils] and a spacing of less than 700m [28 mils] from the centres of two adjacent vias. The via grid should cover the whole space under the ground pad and the vias closest to the RF ports should be located near the edge of the pad to allow a good RF ground connection. Since the vias are important for heat transfer, a proper via filling should be guaranteed during the mounting procedure to get a low thermal resistance between package and heat sink. For power devices the use of heat slugs in the motherboard instead of a grid of via's is recommended. For the mounting process the SMD type package can be handled as a standard surface mount component. The use of either solder or conductive epoxy is possible. The solder thickness after reflow should be typical 50m [2 mils] and the lateral alignment between the package and the motherboard should be within 50m [2 mils]. Caution should be taken to obtain a good and reliable contact over the whole pad areas. Voids or other improper connections, in particular, between the ground pads of motherboard and package will lead to a deterioration of the RF performance and the heat dissipation. The latter effect can reduce drastically reliability and lifetime of the product.
Ref. : CHT4690QAG6332 - 28 Nov 06 11/14 Specifications subject to change without notice
Route Departementale 128, BP46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0) 1 69 33 03 08 - Fax: +33 (0) 1 69 33 03 09
5-30GHz Attenuator
CHT4690-QAG
(For production, design must be adapted with regard to PCB tolerances and assembly process) Basic footprint for a 16L-QFN3x3 (all units mm) (Please, refer to the UMS proposed footprint for optimum operation in the following "Proposed Assembly board" section)
The RF ports are DC blocked on chip. The DC connections (V1,V2) do not include any decoupling capacitor in package, therefore it is mandatory to provide a good external DC decoupling on the PC board, as close as possible to the package.
SMD mounting procedure
The SMD leadless package has been designed for high volume surface mount PCB assembly process. The dimensions and footprint required for the PCB (motherboard) are given in the drawings above. For the mounting process standard techniques involving solder paste and a suitable reflow process can be used. For further details, see application note AN0017.
Ref. : CHT4690QAG6332 - 28 Nov 06
12/14
Specifications subject to change without notice
Route Departementale 128, BP46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0) 1 69 33 03 08 - Fax: +33 (0) 1 69 33 03 09
CHT4690-QAG
5-30GHz Attenuator
Proposed Assembly board "96272" for the 16L-QFN3x3 products characterization.
Compatible with the proposed footprint. Based on typically Ro4003 / 8mils or equivalent. Using a microstrip to coplanar transition to access the package. Recommended for the implementation of this product on a module board.
-
Ref. : CHT4690QAG6332 - 28 Nov 06
13/14
Specifications subject to change without notice
Route Departementale 128, BP46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0) 1 69 33 03 08 - Fax: +33 (0) 1 69 33 03 09
5-30GHz Attenuator
Biasing sequence
CHT4690-QAG
To obtain good performances in linearity, biasing voltage should be applied as following: Control of 1st stage attenuation with V1 from -5V to 0V, with V2 fixed at -5V Control of 2nd stage with V2 from -5V to 0V, with V1 fixed at 0V
RF IN
...
... ...
...
RF OUT
V1
V2
Voltage
0V V1
-5V Min.
V2
Max.
Attenuation
Ordering Information
QFN 3x3 RoHS compliant package: Stick: XY = 20 Tape & reel: XY = 21 CHT4690-QAG/XY
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 authorised for use as critical components in life support devices or systems without express written approval from United Monolithic Semiconductors S.A.S.
Ref. : CHT4690QAG6332 - 28 Nov 06 14/14 Specifications subject to change without notice
Route Departementale 128, BP46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0) 1 69 33 03 08 - Fax: +33 (0) 1 69 33 03 09

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