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12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order Online at www.hittite.com
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HMC346LP3
GaAs MMIC VOLTAGE-VARIABLE
ATTENUATOR, DC - 14 GHz
v02.0604
General Description
Features
Functional Diagram
Wide Bandwidth: DC - 14 GHz
Low Phase Shift vs. Attenuation
30 dB Attenuation Range
Simplifi ed Voltage Control
3 mm x 3 mm x 1 mm SMT Package
Electrical Specifi cations,
T
A
= +25 C, 50 ohm system
Typical Applications
The HMC346LP3 is ideal for:
Basestation Infrastructure
Fiber Optics & Broadband Telecom
Microwave Radio & VSAT
Military Radios, Radar, & ECM
Test Instrumentation
The HMC346LP3 is an absorptive Voltage Variable
Attenuator (VVA) in a low cost leadless surface
mount plastic package operating from DC - 14 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 30 dB ampli-
tude range. This VVA is an excellent alternative to
the HMC121C8.
Parameter
Min
Typical
Max
Units
Insertion Loss
DC - 10 GHz
DC - 14 GHz
1.7
2.8
2.2
3.3
dB
dB
Attenuation Range
DC - 10 GHz
DC - 14 GHz
27
22
30
27
dB
dB
Return Loss
DC - 14 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
-4
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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For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
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-4
-3.5
-3
-2.5
-2
-1.5
-1
-0.5
0
0
2
4
6
8
10
12
14
16
+25 C
-40 C
+85 C
INSERTION LOSS (dB)
FREQUENCY (GHz)
-40
-35
-30
-25
-20
-15
-10
-5
0
0
2
4
6
8
10
12
14
16
ATTENUATION (dB)
FREQUENCY (GHz)
-35
-30
-25
-20
-15
-10
-5
0
0
2
4
6
8
10
12
14
16
MIN
5 dB
MAX
RETURN LOSS (dB)
FREQUENCY (GHz)
-3
-2.5
-2
-1.5
-1
-0.5
0
0
5
10
15
20
25
30
V1
V2
CONTROL VOLTAGE (Vdc)
RELATIVE ATTENUATION (dB)
0
20
40
60
80
100
120
140
160
180
0
2
4
6
8
10
12
14
16
5 dB
10 dB
15 dB
20 dB
25 dB
30 dB
max
RELATIVE PHASE (DEG)
FREQUENCY (GHz)
0
5
10
15
20
25
30
0
2
4
6
8
10
12
14
16
0 dB
3 dB
6 dB
10 dB
INPUT IP3 (dBm)
FREQUENCY (GHz)
GaAs MMIC SUB-HARMONICALLY PUMPED MIXER 17 - 25 GHz
HMC346LP3
Relative Attenuation
Relative Attenuation vs.
Control Voltage @ 10 GHz
GaAs MMIC VOLTAGE-VARIABLE
ATTENUATOR, DC - 14 GHz
v02.0604
Insertion Loss vs. Temperature
Return Loss vs. Attenuation
Relative Phase
Input IP3 vs. Attenuation*
*Two-tone input power = -8 dBm each tone, 1 MHz spacing.
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*Two-tone input power = -8 dBm each tone, 1 MHz spacing.
0.25 dB Compression vs. Attenuation
1 dB Compression vs. Attenuation
10
20
30
40
50
60
70
0
2
4
6
8
10
12
14
16
0 dB
3 dB
6 dB
10 dB
INPUT IP2 (dBm)
FREQUENCY (GHz)
-10
-5
0
5
10
15
0
2
4
6
8
10
12
14
16
0 dB (REF)
6 dB
INPUT .25dB (dBm)
FREQUENCY (GHz)
-5
0
5
10
15
20
0
2
4
6
8
10
12
14
16
0 dB (REF)
6 dB
INPUT P1dB (dBm)
FREQUENCY (GHz)
20
30
40
50
60
70
80
0
2
4
6
8
10
12
14
16
0 dB
3 dB
6 dB
10 dB
SECOND HARMONIC (dBc)
FREQUENCY (GHz)
Input IP2 vs. Attenuation*
HMC346LP3
GaAs MMIC VOLTAGE-VARIABLE
ATTENUATOR, DC - 14 GHz
v02.0604
Second Harmonic
vs. Attenuation, Pin = -8 dBm
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For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order Online at www.hittite.com
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ORS - SMT
9
HMC346LP3
GaAs MMIC VOLTAGE-VARIABLE
ATTENUATOR, DC - 14 GHz
v02.0604
Outline Drawing
Absolute Maximum Ratings
RF Input Power
+18 dBm
Control Voltage Range
+1.0 to -5.0 Vdc
Storage Temperature
-65 to +150 C
Operating Temperature
-40 to +85 C
NOTES:
1. MATERIAL PACKAGE BODY: LOW STRESS INJECTION MOLDED
PLASTIC SILICA AND SILICON IMPREGNATED.
2. LEAD AND GROUND PADDLE MATERIAL: COPPER ALLOY
3. LEAD AND GROUND PADDLE PLATING: Sn/Pb SOLDER
4. DIMENSIONS ARE IN INCHES [MILLIMETERS].
5. LEAD SPACING TOLERANCE IS NON-CUMULATIVE
6. PAD BURR LENGTH SHALL BE 0.15mm MAXIMUM.
PAD BURR HEIGHT SHALL BE 0.05mm MAXIMUM.
7. PACKAGE WARP SHALL NOT EXCEED 0.05mm.
8. ALL GROUND LEADS AND GROUND PADDLE MUST BE SOLDERED
TO PCB RF GROUND.
9. REFER TO HITTITE APPLICATION NOTE FOR SUGGESTED PCB
LAND
PATTERN.
MICROWAVE CORPORATION
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For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order Online at www.hittite.com
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TTENU
A
T
ORS - SMT
9
HMC346LP3
GaAs MMIC VOLTAGE-VARIABLE
ATTENUATOR, DC - 14 GHz
v02.0604
Pin Descriptions
Pin Number
Function
Description
Interface Schematic
1, 3, 7, 10, 12
GND
Package bottom has exposed metal paddle that must also be
connected to PCB RF ground.
2, 11
RF1
RF2
This pin is DC coupled and matched to 50 Ohm. Blocking
capacitors are required if the RF line potential is not equal to 0V.
4, 9, 13, 14, 15, 16
N/C
This pin should be connected to PCB RF ground.
5, 8
V2, V1
Control input (master).
6
I
Control input (slave).
External op-amp control circuit maintains impedance match while attenuation is varied. Input control ranges from 0 Volts (min.
attenuation) to -3.0 Volts (max. attenuation.)
Single-Line Control Driver
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