HMC812LC4_11 Datasheet, PDF (1/8 Pages) Hittite Microwave Corporation – GaAs MMIC VOLTAGE-VARIABLE ATTENUATOR, 5 - 30 GHz

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Typical Applications
The HMC812LC4 is ideal for:
• Point-to-Point Radio
• VSAT Radio
• Test Instrumentation
• Microwave Sensors
• Military, ECM & Radar
Functional Diagram
HMC812LC4
GaAs MMIC VOLTAGE-VARIABLE
ATTENUATOR, 5 - 30 GHz
Features
Wide Bandwidth: 5 - 30 GHz
Excellent Linearity: +28 dBm Input IP3
High Power Handling: +25 dBm Input P1dB
Wide Attenuation Range: 30 dB
24 Lead Ceramic 4x4 mm SMT Package: 16mm²
General Description
The HMC812LC4 is an absorptive Voltage Variable
Attenuator (VVA) which operates from 5 - 30 GHz
and is ideal in designs where an analog DC control
signal must be used to control RF signal levels over a
30 dB amplitude range. It features two shunt-type
attenuators which are controlled by two analog vol-
tages, Vctrl1 and Vctrl2. Optimum linearity perfor-
mance of the attenuator is achieved by first varying
Vctrl1 of the 1st attenuation stage from -3V to 0V
with Vctrl2 fixed at -3V. The control voltage of the
2nd attenuation stage, Vctrl2, should then be varied
from -3V to 0V, with Vctrl1 fixed at 0V. The HMC812LC4
is housed in a RoHS compliant 4x4 mm QFN lead-
less ceramic package
However, if the Vctrl1 and Vctrl2 pins are connected
together it is possible to achieve the full analog atten-
uation 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, 50 Ohm system
Parameter
Min.
Typ.
Max.
Units
Insertion Loss
5 - 16 GHz
2
dB
16 - 24 GHz
3
dB
24 - 30 GHz
4
dB
Attenuation Range
30
dB
Input Return Loss
12
dB
Output Return Loss
8
dB
Input Power for 1 dB Compression (any attenuation)
25
dBm
Input Third Order Intercept
(Two-tone Input Power = 10 dBm Each Tone)
28
dBm
8-1
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