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| 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: KOVARTM (#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 |
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