HMC346MS8G
/
346MS8GE
v05.0607
GaAs MMIC SMT VOLTAGE-VARIABLE
ATTENUATOR, DC - 8 GHz
Typical Applications
Features
Wide Bandwidth: DC - 8 GHz
Low Phase Shift vs. Attenuation
32 dB Attenuation Range
6
ATTENUATORS - SMT
This attenuator is ideal for use as a VVA
for DC - 8 GHz applications:
• Point-to-Point Radio
• VSAT Radio
Functional Diagram
General Description
The HMC346MS8G & HMC346MS8GE are absorp-
tive Voltage Variable Attenuators (VVA) in 8 lead sur-
face-mount packages 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 con-
trol RF signal levels over a 30 dB amplitude range.
Applications include AGC circuits and temperature
compensation of multiple gain stages in microwave
point-to-point and VSAT radios.
Electrical Specifications,
T
A
= +25° C, 50 ohm system
Parameter
Insertion Loss
Attenuation Range
Return Loss
Switching Characteristics
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)
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
27
5
Min
Typical
1.5
32
10
2
8
+8
-2
+25
+10
Max
2.5
Units
dB
dB
dB
ns
ns
dBm
dBm
dBm
dBm
6 - 102
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
HMC346MS8G
/
346MS8GE
v05.0607
GaAs MMIC SMT VOLTAGE-VARIABLE
ATTENUATOR, DC - 8 GHz
Insertion Loss vs. Temperature
0
Relative Attenuation
0
-5
6
ATTENUATORS - SMT
INSERTION LOSS (dB)
ATTENUATION (dB)
7
8
9
10
-1
-10
-15
-20
-25
-30
-35
-2
-3
T+25C
T -40C
T+85C
-4
0
1
2
3
4
5
6
FREQUENCY (GHz)
-40
0
1
2
3
4
5
6
7
8
9
10
FREQUENCY (GHz)
Return Loss vs. Attenuation
0
-5
RETURN LOSS (dB)
-10
-15
-20
-25
-30
0
1
2
3
4
5
6
7
8
9
10
FREQUENCY (GHz)
MIN
15 dB
MAX
Relative Attenuation vs.
Control Voltage @ 4 GHz
0
-0.5
V2 -40C
CONTROL VOLTAGE (Vdc)
-1
V2 +25C
V2 +85C
-1.5
-2
-2.5
V1 +85C
V1 +25C
V1 -40C
-3
0
5
10
15
20
25
30
RELATIVE ATTENUATION (dB)
Relative Phase
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
0
1
2
max
25 dB 30 dB
20 dB
15 dB
10 dB
5 dB
Relative Attenuation vs.
Control Voltage @ 8 GHz
0
-0.5
V2 -40C
CONTROL VOLTAGE (Vdc)
RELATIVE PHASE (DEG)
-1
V2 +25C
V2 +85C
-1.5
-2
-2.5
V1 +85C
V1 +25C
V1 -40C
-3
3
4
5
6
7
8
9
10
0
5
10
15
20
25
30
FREQUENCY (GHz)
RELATIVE ATTENUATION (dB)
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 - 10
HMC346MS8G
/
346MS8GE
v05.0607
GaAs MMIC SMT VOLTAGE-VARIABLE
ATTENUATOR, DC - 8 GHz
Input Second Order
Intercept vs. Attenuation*
70
SECOND ORDER INTERCEPT POINT (dBm)
Input Third Order
Intercept vs Attenuation*
THIRD ORDER INTERCEPT POINT (dBm)
6
ATTENUATORS - SMT
30
60
50
40
30
20
10
0 dB
3 dB
6 dB
10 dB
25
0 dB
3 dB
6 dB
10 dB
20
15
10
5
0
1
2
3
4
5
6
7
8
FREQUENCY (GHz)
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)
Second Harmonic vs. Attenuation
80
70
60
50
40
30
20
0
1
2
3
4
5
6
7
8
FREQUENCY (GHz)
0 dB
3 dB
6 dB
10 dB
*Two-tone input power = -8 dBm each tone, 1 MHz spacing.
6 - 104
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
SECOND HARMONIC (dBc)
HMC346MS8G
/
346MS8GE
v05.0607
GaAs MMIC 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
NOTES:
1. LEADFRAME MATERIAL: COPPER ALLOY
2. DIMENSIONS ARE IN INCHES [MILLIMETERS].
3. DIMENSION DOES NOT INCLUDE MOLDFLASH OF 0.15mm PER SIDE.
4. DIMENSION DOES NOT INCLUDE MOLDFLASH OF 0.25mm PER SIDE.
5. ALL GROUND LEADS AND GROUND PADDLE MUST BE SOLDERED TO
PCB RF GROUND.
-40 to +85 °C
ELECTROSTATIC SENSITIVE DEVICE
OBSERVE HANDLING PRECAUTIONS
Outline Drawing
Package Information
Part Number
HMC346MS8G
HMC346MS8GE
Package Body Material
Low Stress Injection Molded Plastic
RoHS-compliant Low Stress Injection Molded Plastic
Lead Finish
Sn/Pb Solder
100% matte Sn
MSL Rating
MSL1
MSL1
[1]
Package Marking
[3]
H346
XXXX
H346
XXXX
[2]
[1] Max peak reflow temperature of 235 °C
[2] Max peak reflow temperature of 260 °C
[3] 4-Digit lot number XXXX
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 - 10
HMC346MS8G
/
346MS8GE
v05.0607
GaAs MMIC 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.
Interface Schematic
2, 7
GND
This pin must be DC grounded.
3, 6
V2, V1
Control Input (Master).
4
I
Control Input (Slave).
5
N/C
Not Connected.
Single-Line Control Driver
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.)
6 - 106
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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