HMC346G8
v01.0304
GaAs MMIC HERMETIC SMT VOLTAGE-
VARIABLE ATTENUATOR, DC - 8 GHz
Typical Applications
Features
Wide Bandwidth: DC - 8 GHz
Low Phase Shift vs. Attenuation
30 dB Attenuation Range
8 Lead Hermetic SMT Package
6
ATTENUATORS - SMT
The HMC346G8 is ideal for:
• Basestation Infrastructure
• Fiber Optics & Broadband Telecom
• Microwave Radio & VSAT
• Military Radios, Radar, & ECM
• Test Instrumentation
Functional Diagram
General Description
The HMC346G8 is an absorptive Voltage Variable
Attenuator (VVA) in an 8 lead glass/metal (hermetic)
surface-mount package 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 control RF signal levels over a 30 dB ampli-
tude range. Applications include AGC circuits and
temperature compensation of multiple gain stages
in microwave radios and test instrumentation.
Electrical Specifications,
T
A
= +25° C, 50 ohm system
Parameter
Insertion Loss
Attenuation Range
Return Loss
Switching Characteristics
DC - 6 GHz
DC - 8 GHz
DC - 8 GHz
DC - 8 GHz
tRISE, tFALL (10/90% RF)
tON, tOFF (50% CTL to 10/90% RF)
Min. Atten.
Atten. >2 dB
Min. Atten.
Atten. >2 dB
7
Min
Typical
2.0
2.0
30
10
2
8
+8
-2
+25
+10
Max
3.0
3.5
Units
dB
dB
dB
dB
ns
ns
dBm
dBm
dBm
dBm
Input Power for 0.25 dB Compression (0.5 - 8 GHz)
Input Third Order Intercept (0.5 - 8 GHz)
(Two-tone Input Power = -8 dBm Each Tone)
6 - 84
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
HMC346G8
v01.0304
GaAs MMIC HERMETIC SMT VOLTAGE-
VARIABLE ATTENUATOR, DC - 8 GHz
Relative Attenuation, Control Voltage
Optimized for 4 GHz Operation
0
-5
Insertion Loss vs. Temperature
0
6
ATTENUATORS - SMT
-1
INSERTION LOSS (dB)
ATTENUATION (dB)
6
7
8
-10
-15
-20
-25
-30
-35
-40
0
1
2
3
4
5
FREQUENCY
0
1
2
3
4
5
FREQUENCY (GHz)
6
7
8
-2
-3
+ 25C
- 40C
+ 85C
-4
-5
Return Loss vs. Attenuation
0
Relative Attenuation, Control Voltage
Optimized for 8 GHz Operation
0
-5
ATTENUATION (dB)
RETURN LOSS (dB)
-5
-10
-15
-20
-25
-30
-10
-15
-20
5 dB
10 dB
15 dB
20 dB
25 dB
30 dB
-35
-40
-25
0
1
2
3
4
5
6
7
FREQUENCY (GHz)
8
9
10
0
1
2
3
4
5
FREQUENCY (GHz)
6
7
8
Relative Attenuation vs.
Control Voltage @ 4 GHz
0
-0.5
-1
-1.5
-2
-2.5
-3
0
5
10
15
20
25
30
RELATIVE ATTENUATION (dB)
V1 + 25C
V2 + 25C
V1 - 40C
V2 - 40C
V1 + 85C
V2 + 85C
Relative Attenuation vs.
Control Voltage @ 8 GHz
0
-0.5
-1
-1.5
-2
-2.5
-3
0
5
10
15
20
25
30
RELATIVE ATTENUATION (dB)
V1 + 25C
V2 + 25C
V1 - 40C
V2 - 40C
V1 + 85C
V2 + 85C
CONTROL VOLTAGE (Vdc)
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
CONTROL VOLTAGE (Vdc)
6 - 85
HMC346G8
v01.0304
GaAs MMIC HERMETIC SMT VOLTAGE-
VARIABLE ATTENUATOR, DC - 8 GHz
Input Third Order
Intercept vs. Attenuation*
Relative Phase
50
RELATIVE PHASE (DEG)
40
30
20
10
0
0
1
2
ATTENUATORS - SMT
5 dB
10 dB
15 dB
20 dB
25 dB
30 dB
THIRD ORDER INTERCEPT POINT (dBm)
6
60
30
25
0 dB
3 dB
6 dB
10 dB
20
15
10
5
0
1
2
3
4
5
6
7
8
FREQUENCY (GHz)
3
4
5
FREQUENCY (GHz)
6
7
8
Input Second Order
Intercept vs. Attenuation*
70
SECOND ORDER INTERCEPT POINT (dBm)
Second Harmonic vs. Attenuation
80
70
60
50
40
30
20
0 dB
3 dB
6 dB
10 dB
50
40
30
20
10
0
1
2
3
4
5
6
7
8
FREQUENCY (GHz)
0 dB
3 dB
6 dB
10 dB
SECOND HARMONIC (dBc)
60
0
1
2
3
4
5
6
7
8
FREQUENCY (GHz)
0.25 dB Compression vs. Attenuation
20
INPUT.25dB COMPRESSION (dBm)
1 dB Compression vs. Attenuation
20
15
0 dB (REF)
5 dB
15
INPUT P1dB (dBm)
10
10
5
5
0
0
0 dB (REF)
5 dB
-5
0
1
2
3
4
5
6
7
8
FREQUENCY (GHz)
-5
0
1
2
3
4
5
6
7
8
FREQUENCY (GHz)
*Two-tone input power = -8 dBm each tone.
6 - 86
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
HMC346G8
v01.0304
GaAs MMIC HERMETIC SMT VOLTAGE-
VARIABLE ATTENUATOR, DC - 8 GHz
Absolute Maximum Ratings
RF Input Power
Control Voltage Range
Storage Temperature
Operating Temperature
+18 dBm
+1.0 to -5.0 Vdc
-65 to +150 °C
6
ATTENUATORS - SMT
-40 to +85 °C
ELECTROSTATIC SENSITIVE DEVICE
OBSERVE HANDLING PRECAUTIONS
Outline Drawing
NOTES:
1. PACKAGE MATERIAL: ALUMINA LOADED BOROSILICATE GLASS.
2. LEAD, BASE, COVER MATERIAL: KOVAR™ (#7052 CORNING).
3. PLATING: ELECTROLYTIC GOLD 50 MICROINCHES MIN., OVER
ELECTROLYTIC NICKEL 50 MICROINCHES MIN.
4. DIMENSIONS ARE IN INCHES [MILLIMETERS].
5. TOLERANCES: ±.005 [0.13] UNLESS OTHERWISE SPECIFIED.
6. ALL GROUND LEADS AND GROUND PADDLE MUST BE SOLDERED
TO PCB RF GROUND.
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
6 - 87
HMC346G8
v01.0304
GaAs MMIC HERMETIC SMT VOLTAGE-
VARIABLE ATTENUATOR, DC - 8 GHz
Pin Descriptions
6
ATTENUATORS - SMT
Pin Number
1, 8
Function
RF1, RF2
Description
This pin is DC coupled and matched to 50 Ohm. Blocking
capacitors are required if RF line potential is not equal to 0V.
This pin must be DC grounded.
Interface Schematic
2, 7
GND
3, 6
V2, V1
Control Input (Master).
4
I
Control Input (Slave).
5
O
This pin must have an external 500 Ohm resistor to ground.
Single-Line Control Driver
Note:
External op-amp control circuit maintains imped-
ance match while attenuation is varied. Input con-
trol ranges from 0 Volts (min. attenuation) to -2.5
Volts (max. attenuation.)
6 - 88
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
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