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Analog Devices Semiconductor Electronic Components Datasheet

HMC985A Datasheet

GaAs MMIC VOLTAGE - VARIABLE ATTENUATOR

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v01.0117
0 Typical Applications
The HMC985A is ideal for:
• Point-to-Point Radio
• VSAT Radio
• Test Instrumentation
• Microwave Sensors
• Military, ECM & Radar
Functional Diagram
HMC985A
GaAs MMIC VOLTAGE - VARIABLE
ATTENUATOR, 20 - 50 GHz
Features
Wide Bandwidth: 20 - 50 GHz
Excellent Linearity: +32 dB Input IP3
Wide Attenuation Range: 37 dB
Die Size: 2.78 x 1.41 x 0.1 mm
General Description
The HMC985A is an absorptive Voltage Variable
Attenuator (VVA) which operates from 20 - 50 GHz and
is ideal in designs where an analog DC control signal
must be used to control RF signal levels over a 37 dB
dynamic range. It features two shunt-type attenuators
which are controlled by two analog voltages, Vctrl1
and Vctrl2. Optimum linearity performance of the
attenuator is achieved by first varying Vctrl1 of the
first attenuation stage from -5V to 0V with Vctrl2 fixed
at -5V. The control voltage of the second attenuation
stage, Vctrl2, should then be varied from -5V to 0V
with Vctrl1 fixed at 0V.
However, if the Vctrl1 and Vctrl2 pins are connected
together it is possible to achieve the full analog
attenuation range with only a small degradation in
input IP3 performance. Applications include AGC
circuits and temperature compensation of multiple
gain stages in microwave point to point and VSAT
radios.
Electrical Specifications, TA = +25 °C, See Test Conditions
Parameter
Condition
20 - 27
Min.
IInsertion Loss [1]
27 - 35
35 - 50
20 - 27
TBD
Attenuation Range
27 - 35
TBD
35 - 50
TBD
Input Return Loss
Output Return Loss
Input Third Order Intercept
(two-tone input Power = 10 dBm Each Tone) [2}
[1] Vctrl1 = Vctrl2 = -4.0V
[2] Vctrl2 = -3.0V, Vctrl11 = -2.0V worst case
Typ.
2.4
2.5
4.8
37
39
42
13
13
33
Max.
TBD
TBD
TBD
Units
dB
dB
dB
dB
dB
dB
dB
dB
dBm
0-1
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice.
No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
For price, delivery, and to place orders: Analog Devices, Inc.,
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
Phone: 781-329-4700 • Order online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D


Analog Devices Semiconductor Electronic Components Datasheet

HMC985A Datasheet

GaAs MMIC VOLTAGE - VARIABLE ATTENUATOR

No Preview Available !

v01.0117
Attenuation vs. Frequency over Vctrl1
= Variable, Vctrl2 = -5V
0
-5
-10
-15
-20
-25
-30
20
25 30 35 40
FREQUENCY (GHz)
-4 -2.4
--33..62 --12.6
-2.8 -1.2
45 50
-0.8
-00.4
Attenuation vs. Vctrl1
Over Temperature @ 30 GHz, Vctrl2 = -5V
0
-3
-6
-9
-12
-15
-18
-21
-24
-4
-3.6 -3.2 -2.8 -2.4 -2 -1.6 -1.2 -0.8 -0.4
Vctrl1 (V)
0
+25C
+85C
-55C
Attenuation vs. Pin @ 26 GHz
Vctrl1 = Variable, Vctrl2 = -5V
0
-4
-8
TBD-12
-16
-20
-24
0 3 6 9 12 15 18 21 24
INPUT POWER (dBm)
HMC985A
GaAs MMIC VOLTAGE - VARIABLE
ATTENUATOR, 20 - 50 GHz
Attenuation vs. Frequency over Vc-
trl1 = 0V, Vctrl2 = Variable
0
-10
-20
-30
-40
-50
-60
-70
20 25 30 35 40 45 50
FREQUENCY (GHz)
-4 -2.4 -0.8
-3.6 -2
-0.4
-3.2 -1.6 0
-2.8 -1.2
Attenuation vs. Vctrl2
Over Temperature @ 30 GHz, Vctrl1 = 0V
0
-5
-10
-15
-20
-25
-30
-35
-40
-45
-50
-4
-3.6 -3.2 -2.8 -2.4 -2 -1.6 -1.2 -0.8 -0.4
Vctrl2 (V)
0
+25C
+85C
-55C
Attenuation vs. Pin @ 26h GHz
Vctrl2 = Variable, Vctrl1 = 0V
0
-4
TBD-8
-12
-16
-20
-24
0 3 6 9 12 15 18 21 24
INPUT POWER (dBm)
0
For price, delivery, and to place orders: Analog Devices, Inc., One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
Phone: 781-329-4700 • Order online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
0-2


Part Number HMC985A
Description GaAs MMIC VOLTAGE - VARIABLE ATTENUATOR
Maker Analog Devices
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