5
5 - 102
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20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
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HMC346MS8G / 346MS8GE
GaAs MMIC SMT VOLTAGE-VARIABLE
ATTENUATOR, DC - 8 GHz
v07.1008
General Description
Features
Functional Diagram
Wide Bandwidth: DC - 8 GHz
Low Phase Shift vs. Attenuation
32 dB Attenuation Range
Electrical Specifi cations, T
A
 = +25?C, 50 ohm system
Typical Applications
This attenuator is ideal for use as a VVA
for DC - 8 GHz applications:
" Point-to-Point Radio
" VSAT Radio
The HMC346MS8G & HMC346MS8GE are absorp-
tive Voltage Variable Attenuators (VVA) in 8 lead sur-
face-mount packages operating from DC - 8 GHz. It
features an on-chip reference attenuator for use with
an external op-amp to provide simple single voltage
attenuation control, 0 to -3V. The device is ideal in
designs where an analog DC control signal must con-
trol RF signal levels over a 30 dB amplitude range.
Applications include AGC circuits and temperature
compensation of multiple gain stages in microwave
point-to-point and VSAT radios.
Parameter
Min
Typical
Max
Units
Insertion Loss
DC - 8 GHz
1.5
2.5
dB
Attenuation Range
DC - 8 GHz
27
32
dB
Return Loss
DC - 8 GHz
5
10
dB
Switching Characteristics
tRISE, tFALL (10/90% RF)
tON, tOFF (50% CTL to 10/90% RF)
2
8
ns
ns
Input Power for 0.25 dB Compression (0.5 - 8 GHz)
Min. Atten.
Atten. >2 dB
+8
-2
dBm
dBm
Input Third Order Intercept (0.5 - 8 GHz)
(Two-tone Input Power = -8 dBm Each Tone)
Min. Atten.
Atten. >2 dB
+25
+10
dBm
dBm
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