Hittite HMC121C8 Datasheet
MICROWAVE CORPORATION
HMC121C8
GaAs MMIC SMT VOLTAGE-VARIABLE ATTENUATOR DC - 10 GHz
2
ATTENUATORS
SMT
FEBRUARY 2001
Features
WIDE BANDWIDTH: DC - 10 GHz
LOW PHASE SHIFT VS. ATTENUATION
25 dB ATTENUATION RANGE
SIMPLIFIED VOLTAGE CONTROL
V03.0400
General Description
The HMC121C8 is an absorptive Voltage
Variable Attenuator (VVA) in a non-hermetic
surface-mount package covering DC - 10
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 control RF signal levels over a 25 dB
amplitude range. Applications include AGC
circuits and temperature compensation of
multiple gain stages in microwave point-topoint and VSAT radios. See HMC121G8
for a hermetic SMT version of this device.
Guaranteed Perf ormance, 50 ohm system, -55 to +85 deg C
Parameter Min Typical Max Units
Insertion Loss DC -6 GHz :
Attenuation Range DC - 6 GHz:
Return Loss DC -8 GHz:
S witching Characteristics
tRISE,tFALL (10/90% RF):
tON, tOFF (50% CTL to 10/90% R F):
Input Power for 0. 25 dB Compression
(0.5 - 10 GHz)
Input Third Order Intercept (two - 8 dBm
signals, 0.5 - 10 GHz)
12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Web Site: www.hittite.com
DC -8 GHz:
DC -10 GHz :
DC - 10 GHz:
DC - 10 GHz:
Min. Atten:
Atten.>2 dB:
Min. Atten: +18
20
25
11
8
2 - 14
2.0
2.2
3.5
25
30
15
12
3
6
+3
-3
+10
2.5
3.2
4.5
dB
dB
dB
dB
dB
dB
ns
ns
dBm
dBm
dBm
dBm
HMC121C8
MICROWAVE CORPORATION
HMC121C8 SMT VOLTAGE-VARIABLE ATTENUATOR DC - 10 GHz
V03.0400
Insertion Loss Relative Attenuation
0
-1
-2
-3
INSERTION LOSS (dB)
-4
-5
024681012
FREQUENCY (GHz)
-40 C
+25 C
+85 C
0
-10
-20
ATTENUATION (dB)
-30
24 dB
-40
024681012
6dB
18 dB
FREQUENCY (GHz)
Relative Attenuation vs.
Return Loss
0
-5
-10
-15
-20
-25
RETURN LOSS (dB)
-30
-35
024681012
FREQUENCY (GHz)
S11
S22
Control Voltage @ 4.2 GHz
0
-0.5
-1
-1.5
-2
CONTROL VOLTAGE (Vdc)
-2.5
-3
0 5 10 15 20 25 30
RELATIVE ATTENUATION (dB)
V1
Relative Attenuation vs.
Relative Phase
85
75
65
55
45
35
25
15
RELATIVE PHASE (DEG)
5
-5
024681012
9dB
3dB
24 dB
21 dB
15 dB
FREQUENCY (GHz)
Control Voltage @ 10 GHz
0
-0.5
-1
-1.5
-2
CONTROL VOLTAGE (Vdc)
-2.5
-3
0 5 10 15 20 25 30
RELATIVE ATTENUATION (dB)
V1
FEBRUARY 2001
3dB
12 dB
V2
V2
0dB
2
ATTENUATORS
SMT
12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Web Site: www.hittite.com
2 - 15
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