ATTENUATORS - SMT
8
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HMC346AMS8GE
GaAs MMIC SMT VOLTAGE-VARIABLE
ATTENUATOR, DC - 8 GHz
v03.1119
General Description
Features
Functional Diagram
Wide Bandwidth: DC - 8 GHz
Low Phase Shift vs. Attenuation
32 dB Attenuation Range
Electrical Specications, TA = +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 HMC346AMS8GE is absorptive Voltage Variable
Attenuators (VVA) in 8 lead surface-mount packages
operating from DC - 8 GHz. It features an on-chip ref-
erence attenuator for use with an external op-amp to
provide simple single voltage attenuation control, 0 to
-5V. 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 cir-
cuits 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 2.1 3.1 dB
Attenuation Range DC - 8 GHz 23 28 dB
Return Loss DC - 8 GHz 5 10 dB
Switching Characteristics tRISE, tFALL (10/90% RF)
tON, tOFF (50% CTL to 10/90% RF)
8
16
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
+30
+10
dBm
dBm
For price, delivery, and to place orders: Analog Devices, Inc.,
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
Phone: 781-329-4700 • Order online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
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. Specications 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.
ATTENUATORS - SMT
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8 - 2
For price, delivery, and to place orders: Analog Devices, Inc., One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
Phone: 781-329-4700 • Order online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
Relative Attenuation
Relative Attenuation vs.
Control Voltage @ 4 GHz
Insertion Loss vs. Temperature
Return Loss vs. Attenuation
Relative Phase
Relative Attenuation vs.
Control Voltage @ 8 GHz
-5
-4
-3
-2
-1
0
012345678910
+25 C +85 C '-40 C
INSERTION LOSS (dB)
FREQUENCY (GHz)
-5
-4
-3
-2
-1
0
0 5 10 15 20 25 30
CONTROL VOLTAGE (Vdc)
RELATIVE ATTENUATION (dB)
V2 +85C V2 +25C
V2 -40C
V1 +85C V1 +25C V1 -40C
-30
-25
-20
-15
-10
-5
0
012345678910
Min 15 dB Max
RETURN LOSS (dB)
FREQUENCY (GHz)
0
30
60
90
120
150
180
012345678910
5 dB
10dB
15 dB
20 dB
25 dB
30dB
Max
RELATIVE PHASE (deg)
FREQUENCY (GHz)
-5
-4
-3
-2
-1
0
0 5 10 15 20 25 30
CONTROL VOLTAGE (Vdc)
RELATIVE ATTENUATION (dB)
V2 +85C V2 +25C
V2 -40C
V1 +85C V1 +25C V1 -40C
-40
-30
-20
-10
0
012345678910
5 dB
10dB
15 dB
20 dB
25 dB
30dB
Max
ATTENUATION (dB)
FREQUENCY (GHz)
HMC346AMS8GE
v0 3.1119
GaAs MMIC SMT VOLTAGE-VARIABLE
ATTENUATOR, DC - 8 GHz
ATTENUATORS - SMT
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Input Third Order
Intercept vs Attenuation*
*Two-tone input power = -8 dBm each tone, 1 MHz spacing.
Input Second Order
Intercept vs. Attenuation*
0.25 dB Compression vs. Attenuation 1 dB Compression vs. Attenuation
Second Harmonic vs. Attenuation
10
20
30
40
50
60
70
80
90
012345678
0 dB
3 dB 6 dB
10 dB
SECOND HARMONIC (dBc)
FREQUENCY (GHz)
0
5
10
15
20
012345678
0 dB 5 dB
INPUT P1 dB (dBm)
FREQUENCY (Ghz)
0
5
10
15
20
012345678
0 dB 5 dB
INPUT 0.25 dB (dBm)
FREQUENCY (Ghz)
10
20
30
40
50
60
70
80
90
012345678
0 dB
3 dB 6 dB
10 dB
SEECOND ORDER INTERCEPT POINT(dBm)
FREQUENCY (GHz)
0
5
10
15
20
25
30
35
40
012345678
0 dB
3 dB 6 dB
10 dB
THIRD ORDER INTERCEPT POINT (dBm)
FREQUENCY (GHz)
HMC346AMS8GE
v0 3.1119
GaAs MMIC SMT VOLTAGE-VARIABLE
ATTENUATOR, DC - 8 GHz
For price, delivery, and to place orders: Analog Devices, Inc., One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
Phone: 781-329-4700 • Order online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
ATTENUATORS - SMT
8
8 - 4
For price, delivery, and to place orders: Analog Devices, Inc., One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
Phone: 781-329-4700 • Order online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
Outline Drawing
Absolute Maximum Ratings
RF Input Power +18 dBm
DC Voltage on I Pin +/- 0.8V
Control Voltage Range +0.3 to -6 V
Storage Temperature -65 to +150 °C
Operating Temperature -40 to +85 °C
Junction Temperature +175 °C
Junction to Case Thermal Resistance 10 °C/W
ESD Sensitivity Class 1 A ELECTROSTATIC SENSITIVE DEVICE
OBSERVE HANDLING PRECAUTIONS
HMC346AMS8GE
v0 3.1119
GaAs MMIC SMT VOLTAGE-VARIABLE
ATTENUATOR, DC - 8 GHz
State Bias Condition
V1 -5 to 0V @ 9mA typical
V2 -5 to 0V @ 9mA typical
Part Number Package Body Material Lead Finish MSL Rating Package Marking [2]
HMC346AMS8GE RoHS-compliant Low Stress Injection Molded Plastic 100% matte Sn MSL3 [1] H346A
XXXX
HMC346AMS8GETR RoHS-compliant Low Stress Injection Molded Plastic 100% matte Sn MSL3 [1] H346A
XXXX
EV1HMC346AMS8G Eval Board
[1] Max peak reow temperature of 260 °C
[2] 4-Digit lot number XXXX
Package Information
0.94
0.86
0.78
0.40
0.33
0.25
8-Lead Mini Small Outline Package with Exposed Pad [MINI_SO_EP]
(RH-8-1)
Dimensions shown in millimeters
COMPLIANT TO JEDEC STANDARDS MO-187-AA-T
3.10
3.00
2.90
3.10
3.00
2.90
5.05
4.90
4.75
0.70
0.55
0.40
0.13
MAX 0.95
REF
TOP VIEW BOTTOM VIEW
SIDE VIEW END VIEW
08-02-2019-B
PKG-003371
1
4
58
0.65
BSC
1.10
MAX
1.95 BSC
0.23
0.08
COPLANARITY
0.10
0.25 GAGE
PLANE
6°
0°
2.26
2.16
2.06
1.83
1.73
1.63
EXPOSED
PAD
8-Lead Mini Small Outline Package with Exposed Pad [MINI_SO_EP]
(RH-8-1)
Dimensions shown in millimeters
ATTENUATORS - SMT
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Pin Number Function Description Interface Schematic
1, 8 RF1
RF2
This pin is DC coupled and matched to 50 Ohm. 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).
5N/C Not Connected.
Pin Descriptions
External op-amp control circuit maintains impedance match while attenuation is varied. Input control ranges from 0 Volts
(min. attenuation) to -5 Volts (max. attenuation.)
Single-Line Control Driver
600
600
5050
600
600
HMC346AMS8GE
v0 3.1119
GaAs MMIC SMT VOLTAGE-VARIABLE
ATTENUATOR, DC - 8 GHz
For price, delivery, and to place orders: Analog Devices, Inc., One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
Phone: 781-329-4700 • Order online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
ATTENUATORS - SMT
8
8 - 6
For price, delivery, and to place orders: Analog Devices, Inc., One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
Phone: 781-329-4700 • Order online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
Evaluation PCB
The circuit board used in the application should
be generated with proper RF circuit design tech-
niques. 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 Analog Devices, upon request.
List of Materials for Evaluation EV1HMC346AMS8G [1]
Item Description
J1 - J2 PCB Mount SMA RF Connector
J3 - J7 DC PIN
U1 HMC346AMS8GE
PCB [2] 104089 Eval Board
[1] Reference this number when ordering complete evaluation PCB
[2] Circuit Board Material: Rogers 4350
HMC346AMS8GE
v0 3.1119
GaAs MMIC SMT VOLTAGE-VARIABLE
ATTENUATOR, DC - 8 GHz