HMC346G8
v01.0304
GaAs MMIC HERMETIC SMT VOLTAGEVARIABLE 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 amplitude range. Applications include AGC circuits and temperature compensation of multiple gain stages in microwave radios and test instrumentation.
Electrical Specifications, TA = +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 VOLTAGEVARIABLE ATTENUATOR, DC - 8 GHz
Relative Attenuation, Control Voltage Optimized for 4 GHz Operation
0 -5
Insertion Loss vs. Temperature
0
6
ATTENUATORS - SMT
6 - 85
-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)
HMC346G8
v01.0304
GaAs MMIC HERMETIC SMT VOLTAGEVARIABLE 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 VOLTAGEVARIABLE 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
6 - 87
-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
HMC346G8
v01.0304
GaAs MMIC HERMETIC SMT VOLTAGEVARIABLE 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 impedance match while attenuation is varied. Input control 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
HMC346G8
v01.0304
GaAs MMIC HERMETIC SMT VOLTAGEVARIABLE ATTENUATOR, DC - 8 GHz
Evaluation PCB
6
ATTENUATORS - SMT
List of Materials for Evaluation PCB 104095
Item J1 - J2 J3 - J7 U1 PCB [2] Description PCB Mount SMA RF Connector DC PIN HMC346G8 104093-2 Eval Board [1] [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 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 - 89
