United Monolithic Semiconductors CHT3091RCF-24 Datasheet
DC-40GHz Attenuator
GaAs Monolithic Microwave IC in SMD leadless package
Description
The monolithic microwave IC (MMIC) in the
package is a variable DC-40GHz
attenuator. It is designed for a wide range of
applications, from military to commercial
communication systems.
The circuit is manufactur ed with a MESFET
process, 0.7µm gate length, via holes
through the substrate and air bridges.
It is supplied in a new
carrier.
SMD Package Dimensions
SMD leadless chip
CHT3091RCF
Main Features
■ Broad band performance: DC-40G Hz
■ Minimum attenuation [S21] : 4dB
( VS = 0V; VP = -5V )
■ Maximum attenuation [S21] : 20dB
( VS = -5V; VP = 0V )
■ Minimum input 1dB compression point
) : 14dBm
(P
-1dB
■ SMD leadless package
■ Dimensions: 5.08 x 5.08 x 0.97 mm
3
not to scale; not all details shown;
not to scale; not all details shown;
dimensions are in millimeters [inches]
dimensions are in millimeters [inches]
UMS
UMS
CHT3091
CHT3091
PIN 1 Index
PIN 1 Index
5.08 [0.20]
5.08 [0.20]
"Please note that PIN 1 is located in the lower left corner of the package (front-side view) for all SMD-type packages from United Monolithic Semiconductors. It is indicated
by a triangle on the package lid. Starting with PIN 1 the other pads are numbered counter-clockwise (front-side view). ATTENTION: The dot on the backside of the
package (i.e. side with metallic pads) is just for fabrication purposes and does NOT indicate the location of PIN
5.08 [0.20]
5.08 [0.20]
FunctionPINFunctionPIN
FunctionPINFunctionPIN
NC5Vs1
NC5Vs1
NC6NC2
NC6NC2
NC7Vp3
NC7Vp3
RF in8RF out4
RF in8RF out4
1.02 [0.04]
1.02 [0.04]
2.46
2.46
[0.10]
[0.10]
0.97
0.97
[0.038]
[0.038]
2.46
2.46
[0.10]
[0.10]
4
4
3
3
0.91
0.91
[0.036]
[0.036]
0.46
0.46
[0.02]
[0.02]
65
7
65
7
8
8
12
12
EXPOSED
EXPOSED
GROUND PAD
GROUND PAD
CONNECT TO RF
CONNECT TO RF
GROUND PLANE
GROUND PLANE
0.86 [0.034]
0.86 [0.034]
0.46
0.46
[0.02]
[0.02]
Ref. : DSCHT3091RCF1257 - 14-Sept-01- 1/3 Specifications subject to change without notic e
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
CHT3091RCF
DC-40GHz Attenuator
Typical Bias Conditions
for an ambient Temperat ur e of +25°C
Symbol Pin No. Parameter Values Unit
Vs 1 VS control voltage -5 to 0 V
Vp 3 VP control voltage 0 to –5 V
All other pins are not used for this device.
Footprint
Suggested PCB Footprint
Suggested PCB Footprint
for CHT3091RCF
for CHT3091RCF
2.03 [0.080]
2.03 [0.080]
not to scale; dimensions are
not to scale; dimensions are
in millimeters [inches]
in millimeters [inches]
4.93 [0.194]
4.93 [0.194]
1.02
1.02
[0.040]
[0.040]
0.88 [0.035]
0.88 [0.035]
0.46
0.46
[0.018]
[0.018]
1.02
1.02
[0.040]
[0.040]
0.86 [0.034]
0.86 [0.034]
0.46
0.46
[0.02]
[0.02]
3.91 [0.154]
3.91 [0.154]
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 t echniques involving solder paste and a suitable reflow
process can be used.
For further details, see applicat ion note AN0005.
Ref. : DSCHT3091RCF1257 - 14-Sept-01- 2/3 Specifications subject to change without notic e
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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