HMC985 Datasheet, PDF (1/10 Pages) Hittite Microwave Corporation – Gaas mmic voltage - variable attenuator, 20 - 50 GHz

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Typical Applications
The HMC985 is ideal for:
• Point-to-Point Radio
• VSAT Radio
• Test Instrumentation
• Microwave Sensors
• Military, ECM & Radar
Functional Diagram
HMC985
Gaas mmic voltage - variable
attenuator, 20 - 50 GHz
Features
Wide Bandwidth: 20 - 50 GHz
Excellent Linearity: +32 dB Input IP3
Wide Attenuation Range: 35 dB
Die Size: 2.78 x 1.37 x 0.1 mm
General Description
The HMC985 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 35 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 -3V to 0V with Vctrl2 fixed
at -3V. The control voltage of the second attenuation
stage, Vctrl2, should then be varied from -3V 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, T_A = +25 °C, See Test Conditions
Parameter
Condition
Min.
Typ.
20 - 27
3
Insertion Loss
27 - 35
3
35 - 50
3.5
20 - 27
25
30
Attenuation Range
27 - 35
30
35
35 - 50
35
40
Input Return Loss
13
Output Return Loss
13
Input Third Order Intercept
(two-tone input Power = 10 dBm Each Tone) ^[1]
33
[1] VCTR2 = -3, VCTR1 = -2.0 worst case
Max.
3.5
4
4.5
Units
dB
dB
dB
dB
dB
dB
dB
dB
dBm
0-1
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: [phone] Fax: [phone] Order On-line at www.hittite.com
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