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| MICROWAVE CORPORATION HMC121C8 V03.0400 GaAs MMIC SMT VOLTAGE-VARIABLE ATTENUATOR DC - 10 GHz FEBRUARY 2001 Features WIDE BANDWIDTH: DC - 10 GHz LOW PHASE SHIFT VS. ATTENUATION General Description The HMC121C8 is an absorptive Voltage Variable Attenuator (VVA) in a non-hermetic surface-mount package covering DC - 10 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 25 dB amplitude range. Applications include AGC circuits and temperature compensation of multiple gain stages in microwave point-topoint and VSAT radios. See HMC121G8 for a hermetic SMT version of this device. 2 SMT ATTENUATORS 25 dB ATTENUATION RANGE SIMPLIFIED VOLTAGE CONTROL Guaranteed Performance, 50 ohm system, -55 to +85 deg C Parameter Inse rtion L oss DC - 6 GHz : DC - 8 GHz : DC - 10 GHz : DC - 6 GHz: DC - 10 GHz : DC - 8 GHz: DC - 10 GHz : tRISE, tFALL (10/90% RF): tON, tOFF (50% CTL to 10/90% RF): Input Power for 0.25 dB C ompre ssion (0.5 - 10 GHz) Input Third Order Intercept (two - 8 dBm signals, 0.5 - 10 GHz) Min. Atten: Atten. >2 dB: Min. Atten: 20 25 11 8 Min Typical 2.0 2.2 3.5 25 30 15 12 3 6 +3 -3 +18 +10 Max 2.5 3.2 4.5 Units dB dB dB dB dB dB ns ns dBm dBm dBm dBm Attenuation Range Return Loss Switching Characteristics 12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Web Site: www.hittite.com 2 - 14 HMC121C8 MICROWAVE CORPORATION HMC121C8 SMT VOLTAGE-VARIABLE ATTENUATOR DC - 10 GHz V03.0400 FEBRUARY 2001 Insertion Loss 0 -40 C INSERTION LOSS (dB) -1 Relative Attenuation 0 ATTENUATION (dB) +25 C -2 -10 6 dB 3 dB 0 dB -20 -3 +85 C -4 2 24 dB 18 dB 12 dB 8 10 12 -30 -5 0 2 4 6 8 10 12 FREQUENCY (GHz) -40 0 2 4 6 FREQUENCY (GHz) Return Loss 0 -5 S11 RETURN LOSS (dB) -10 -15 -20 -25 S22 -30 -35 0 2 4 6 8 10 12 FREQUENCY (GHz) Relative Attenuation vs. Control Voltage @ 4.2 GHz 0 V2 CONTROL VOLTAGE (Vdc) -0.5 -1 -1.5 -2 -2.5 V1 -3 0 5 10 15 20 25 30 RELATIVE ATTENUATION (dB) Relative Phase 85 24 dB 75 65 15 dB 55 45 35 3 dB 25 15 5 -5 0 2 4 6 8 10 12 FREQUENCY (GHz) 9 dB 21 dB Relative Attenuation vs. Control Voltage @ 10 GHz 0 V2 CONTROL VOLTAGE (Vdc) -0.5 -1 -1.5 -2 -2.5 -3 0 5 10 15 20 25 30 RELATIVE ATTENUATION (dB) RELATIVE PHASE (DEG) V1 12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Web Site: www.hittite.com 2 - 15 SMT ATTENUATORS HMC121C8 MICROWAVE CORPORATION HMC121C8 SMT VOLTAGE-VARIABLE ATTENUATOR DC - 10 GHz FEBRUARY 2001 V03.0400 Input Third Order Intercept vs. Attenuation THIRD ORDER INTERCEPT (dBm) 30 Reference 10 dB 20 25 Input Second Order Intercept vs. Attenuation SECOND ORDER INTERCEPT (dBm) 60 Reference 50 3 dB 2 SMT ATTENUATORS 40 15 6 dB 10 3 dB 5 0 1 2 3 4 5 6 7 8 9 10 30 6 dB 20 10 dB 10 0 1 2 3 4 5 6 7 8 9 10 FREQUENCY (GHz) FREQUENCY (GHz) 0.25 dB Compression vs. Attenuation 15 1 dB Compression vs. Attenuation 15 0.25 dB COMPRESSION (dBm) 10 Reference 5 6 dB 0 1 dB COMPRESSION (dBm) Reference 10 5 0 6 dB -5 -5 -10 0 1 2 3 4 5 6 7 8 9 10 -10 0 1 2 3 4 5 6 7 8 9 10 FREQUENCY (GHz) FREQUENCY (GHz) Second Harmonic vs. Attenuation 70 SECOND HARMONIC (dBc) Reference 60 3 dB 50 6 dB 40 10 dB 30 0 1 2 3 4 5 6 7 8 9 10 FREQUENCY (GHz) 12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Web Site: www.hittite.com 2 - 16 HMC121C8 MICROWAVE CORPORATION HMC121C8 SMT VOLTAGE-VARIABLE ATTENUATOR DC - 10 GHz V03.0400 FEBRUARY 2001 Schematic 50 50 Absolute Maximum Ratings RF Input RF2 +16dBm +1.0 to -6.0 Vdc -65 to +150 deg C -55 to +85 deg C RF1 Control Voltage Range Storage Temperature Operating Temperature 500 500 500 2 SMT ATTENUATORS 500 V2 I O V1 Outline Drawing 1. 2. 3. 4. 5. MATERIAL: A) PACKAGE BODY & COVER : WHITE ALUMINA (92%) B) LEADS & PACKAGE BOTTOM: COPPER PLATING : ELECTROLYTIC GOLD 100 - 200 MICROINCHES OVER ELECTROLYTIC NICKEL 100 TO 200 MICROINCHES. DIMENSIONS ARE IN INCHES (MILLIMETERS). UNLESS OTHERWISE SPECIFIED TOL. ARE 0.005(0.13). ALL UNLABELED LEADS ARE GROUND. THESE LEADS ARE CONNECTED INTERNALLY TO THE PACKAGED BOTTOM GROUND. THE PACKAGE BOTTOM RF GROUND MUST BE SOLDERED TO THE PCB RF GROUND. PACKAGE LENGTH AND WIDTH DIMENSIONS SHOWN DO NOT INCLUDE LID SEAL PROTRUSION. ALLOWABLE PROTRUSION SHALL BE 0.005 (0.127MM) PER SIDE. 12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Web Site: www.hittite.com 2 - 17 HMC121C8 MICROWAVE CORPORATION HMC121C8 SMT VOLTAGE-VARIABLE ATTENUATOR DC - 10 GHz FEBRUARY 2001 V02.0400 Single-Line Control Driver 50 50 RF1 RF2 2 500 500 500 SMT ATTENUATORS 500 V2 I O V1 CTL +5V 1N4148 500 3.9K 500 3.9K TL321 OR EQUIVALENT -5V 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.) 12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Web Site: www.hittite.com 2 - 18 HMC121C8 MICROWAVE CORPORATION HMC121C8 SMT VOLTAGE-VARIABLE ATTENUATOR DC - 10 GHz V02.0400 FEBRUARY 2001 Evaluation PCB 2 SMT ATTENUATORS The circuit board used in the final application should be generated with proper RF circuit design techniques. Signal lines at the RF port should have 50 ohm impedance and the package ground leads and package bottom ground should be connected directly to the ground plane similar to that shown above. The evaluation circuit board shown above is available from Hittite Microwave Corporation upon request. List of Material Item J1 - J2 J3 - J7 U1 PCB* Description PC Mount SMA RF Connector DC PIN HMC121C8 VVA 102084 Eval Board * Circuit Board Material : Rogers 4350 12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Web Site: www.hittite.com 2 - 19 |
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