HMC346C8
v02.1008
ATTENUATORS - SMT
5
GaAs MMIC SMT VOLTAGEVARIABLE ATTENUATOR, DC - 8 GHz
Typical Applications
Features
The HMC346C8 is ideal for:
Wide Bandwidth: DC - 8 GHz
• Basestation Infrastructure
Low Phase Shift vs. Attenuation
• Fiber Optics & Broadband Telecom
30 dB Attenuation Range
• Microwave Radio & VSAT
Surface Mount Ceramic Package
• Military Radios, Radar, & ECM
• Test Instrumentation
Functional Diagram
General Description
The HMC346C8 is an absorptive Voltage Variable
Attenuator (VVA) in a non-hermetic surface-mount
ceramic 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 amplitude range.
Applications include AGC circuits and temperature
compensation of multiple gain stages in microwave
radios and test instrumentation.
Electrical Specifi cations, TA = +25° C, 50 ohm system
Parameter
Typical
Max
Units
Insertion Loss
DC - 6 GHz
DC - 8 GHz
Min
1.9
2.1
2.9
3.1
dB
dB
Attenuation Range
DC - 8 GHz
30
dB
Return Loss
DC - 8 GHz
10
dB
2
8
ns
ns
+8
-2
dBm
dBm
+25
+10
dBm
dBm
Switching Characteristics
tRISE, tFALL (10/90% RF)
tON, tOFF (50% CTL to 10/90% RF)
5 - 78
Input Power for 0.25 dB Compression (0.5 - 8 GHz)
Min. Atten.
Atten. >2 dB
Input Third Order Intercept (0.5 - 8 GHz)
(Two-tone Input Power = -8 dBm Each Tone)
Min. Atten.
Atten. >2 dB
For price,
delivery,
and to placeCorporation:
orders: Analog Devices, Inc.,
For price, delivery, and to place orders, please contact
Hittite
Microwave
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
20 Alpha Road, Chelmsford, MA 01824 Phone: Phone:
978-250-3343
978-250-3373
781-329-4700Fax:
• Order
online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
Order On-line at www.hittite.com
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
HMC346C8
v02.1008
GaAs MMIC SMT VOLTAGEVARIABLE ATTENUATOR, DC - 8 GHz
0
0
ATTENUATION (dB)
INSERTION LOSS (dB)
-5
-1
-2
+25C
+85C
-40C
-3
-10
-15
-20
-25
-4
-30
-5
-35
0
1
2
3
4
5
6
7
8
9
10
0
1
2
3
FREQUENCY (GHz)
0
0
-5
-5
ATTENUATION (dB)
RETURN LOSS (dB)
5
6
7
8
9
10
Relative Attenuation, Control Voltage
Optimized for 8 GHz Operation
Return Loss vs. Attenuation
-10
-15
-20
5dB
10dB
15dB
20dB
25dB
30dB
-25
-30
-10
-15
-20
-25
-30
-35
-35
0
1
2
3
4
5
6
7
8
9
10
0
1
2
FREQUENCY (GHz)
3
4
5
6
7
8
9
10
FREQUENCY (GHz)
Relative Attenuation vs.
Control Voltage @ 4 GHz
Relative Attenuation vs.
Control Voltage @ 8 GHz
0
0
V1 +25C
V2 +25C
V1 +85C
V2 +85C
V1 -40C
V2 -40C
-0.5
-1
CONTROL VOLTAGE (Vdc)
CONTROL VOLTAGE (Vdc)
4
FREQUENCY (GHz)
ATTENUATORS - SMT
5
Relative Attenuation, Control Voltage
Optimized for 4 GHz Operation
Insertion Loss vs. Temperature
-1.5
-2
-2.5
-3
V1 +25C
V2 +25C
V1 +85C
V2 +85C
V1 -40C
V2 -40C
-0.5
-1
-1.5
-2
-2.5
-3
0
5
10
15
20
25
30
RELATIVE ATTENUATION (dB)
0
5
10
15
20
25
30
RELATIVE ATTENUATION (dB)
For price,
delivery,
and to placeCorporation:
orders: Analog Devices, Inc.,
For price, delivery, and to place orders, please contact
Hittite
Microwave
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
20 Alpha Road, Chelmsford, MA 01824 Phone: Phone:
978-250-3343
978-250-3373
781-329-4700Fax:
• Order
online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
Order On-line at www.hittite.com
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
5 - 79
HMC346C8
v02.1008
GaAs MMIC SMT VOLTAGEVARIABLE ATTENUATOR, DC - 8 GHz
Input Third Order
Intercept vs. Attenuation*
Relative Phase
30
140
120
25
5dB
10dB
15dB
20dB
25dB
30dB
100
80
IP3 (dBm)
RELATIVE PHASE (DEG)
60
0 dB
3 dB
10 dB
6 dB
20
15
40
10
20
5
0
0
1
2
3
4
5
6
7
8
9
0
10
1
2
3
Input Second Order
Intercept vs. Attenuation*
IP2 (dBm)
5
6
7
8
9
10
Second Harmonic vs. Attenuation
70
80
60
70
50
40
30
0 dB
3 dB
6 dB
10 dB
20
10
0 dB
60
10 dB
50
40
3 dB
6 dB
30
20
0
1
2
3
4
5
6
7
8
9
10
0
1
2
3
FREQUENCY (GHz)
4
5
6
7
8
FREQUENCY (GHz)
1 dB Compression vs. Attenuation
0.25 dB Compression vs. Attenuation
20
15
16
10
P1dB (dBm)
INPUT 0.25 dB COMPRESSION (dBm)
4
FREQUENCY (GHz)
FREQUENCY (GHz)
SECOND HARMONIC (dBc)
ATTENUATORS - SMT
5
6 dB
0 dB (REF)
5
0
12
6dB
0dB
8
4
0
-5
0
1
2
3
4
5
6
7
8
9
10
FREQUENCY (GHz)
0
1
2
3
4
5
6
7
8
9
10
FREQUENCY (GHz)
*Two-tone input power = -8 dBm each tone.
5 - 80
For price,
delivery,
and to placeCorporation:
orders: Analog Devices, Inc.,
For price, delivery, and to place orders, please contact
Hittite
Microwave
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
20 Alpha Road, Chelmsford, MA 01824 Phone: Phone:
978-250-3343
978-250-3373
781-329-4700Fax:
• Order
online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
Order On-line at www.hittite.com
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
HMC346C8
v02.1008
GaAs MMIC SMT VOLTAGEVARIABLE ATTENUATOR, DC - 8 GHz
RF Input Power
+18 dBm
Control Voltage Range
+1.0 to -5V
Channel Temperature
150 °C
Thermal Resistance
190 °C/W
Storage Temperature
-65 to +150 °C
Operating Temperature
-40 to +85 °C
ESD Sensitivity (HBM)
Class 1A
ELECTROSTATIC SENSITIVE DEVICE
OBSERVE HANDLING PRECAUTIONS
ATTENUATORS - SMT
5
Absolute Maximum Ratings
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 placeCorporation:
orders: Analog Devices, Inc.,
For price, delivery, and to place orders, please contact
Hittite
Microwave
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
20 Alpha Road, Chelmsford, MA 01824 Phone: Phone:
978-250-3343
978-250-3373
781-329-4700Fax:
• Order
online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
Order On-line at www.hittite.com
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
5 - 81
HMC346C8
v02.1008
GaAs MMIC SMT VOLTAGEVARIABLE ATTENUATOR, DC - 8 GHz
ATTENUATORS - SMT
5
Pin Descriptions
Pin Number
Function
Description
1, 8
RF1, RF2
This pin is DC coupled and matched to 50 Ohms. Blocking
capacitors are required if RF line potential is not equal to 0V.
2, 7
GND
This pin must be DC grounded.
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.
Interface Schematic
Single-Line Control Driver
Note:
External op-amp control circuit maintains impedance match while attenuation is varied. Input control
ranges from 0 Volts (min. attenuation) to -2.5 Volts
(max. attenuation.)
5 - 82
For price,
delivery,
and to placeCorporation:
orders: Analog Devices, Inc.,
For price, delivery, and to place orders, please contact
Hittite
Microwave
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
20 Alpha Road, Chelmsford, MA 01824 Phone: Phone:
978-250-3343
978-250-3373
781-329-4700Fax:
• Order
online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
Order On-line at www.hittite.com
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
HMC346C8
v02.1008
GaAs MMIC SMT VOLTAGEVARIABLE ATTENUATOR, DC - 8 GHz
5
ATTENUATORS - SMT
Evaluation PCB
List of Materials for Evaluation PCB 109023 [1]
Item
Description
J1 - J2
PCB Mount SMA RF Connector
J3 - J7
DC PIN
U1
HMC346C8
PCB [2]
Eval Board 102084-5
[1] Reference this number when ordering complete evaluation PCB
[2]Circuit Board Material: Rogers 4350
The circuit board used in the final application
should be generated with proper RF circuit design
techniques. Signal lines at the RF ports should be
50 ohm impedance and the package ground leads
and package bottom should be connected directly
to the PCB RF ground plane, similar to that shown
above. The evaluation circuit board shown above is
available from Hittite Microwave Corporation upon
request.
For price,
delivery,
and to placeCorporation:
orders: Analog Devices, Inc.,
For price, delivery, and to place orders, please contact
Hittite
Microwave
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
20 Alpha Road, Chelmsford, MA 01824 Phone: Phone:
978-250-3343
978-250-3373
781-329-4700Fax:
• Order
online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
Order On-line at www.hittite.com
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
5 - 83
