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| MICROWAVE CORPORATION HMC121G8 General Description The HMC121G8 is an absorptive voltage variable attenuator provided in a surfacemount hermetic package. It features an onchip reference attenuator for use with an GaAs MMIC SMT VOLTAGE-VARIABLE ATTENUATOR DC - 8 GHz FEBRUARY 2001 Features WIDE BANDWIDTH: DC - 8 GHZ LOW PHASE SHIFT VS. ATTENUATION 2 SMT ATTENUATORS 30 dB ATTENUATION RANGE SIMPLIFIED VOLTAGE CONTROL external op-amp to provide simple single voltage attenuation control. The device is ideal in designs where an analog control signal must control RF signal levels over a 30 dB amplitude range, such as in AGC circuits and in temperature compensation of multiple gain stages. Applications include military ECM and communications as well as commercial microwave radios and VSAT. Guaranteed Performance, 50 ohm system, -55 to +85 deg C Parameter Insertion Loss Attenuation Range Return Loss Switching Characteristics DC - 4 GHz: DC - 8 GHz: tRISE, tFALL ( 10/90% RF): tON, tOFF (50% CTL to 10/90% RF): Min. Atten: Atten. > 2dB: Min. Atten: Atten. > 2dB: DC - 4 GHz: DC - 8 GHz: 25 10 7 Min. Typ. 1.5 2 30 15 10 3 6 +10 -2 +25 +10 Max. 3.0 3.5 Units dB dB dB dB dB ns ns dBm dBm dBm dBm Input Power for 0.25dB Comp. ( 0.5 - 8GHz) Input Third Order Intercept (two - 8 dBm signals) 12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Web Site: www.hittite.com 2 - 20 HMC121G8 MICROWAVE CORPORATION HMC121G8 SMT VOLTAGE-VARIABLE ATTENUATOR DC - 8 GHz FEBRUARY 2001 Insertion Loss 0 Relative Attenuation 0 INSERTION LOSS (dB) -1 -2 -3 ATTENUATION (dB) -10 -20 2 SMT ATTENUATORS -4 -5 0 2 4 6 8 10 FREQUENCY (GHz) -30 -40 0 2 4 6 8 10 FREQUENCY (GHz) Return Loss 0 Relative Attenuation vs. Control Voltage 0 -0.5 -1 -1.5 -2 -2.5 -3 V1 V2 -10 -20 -30 0 2 4 6 8 10 FREQUENCY (GHz) CONTROL VOLTAGE RETURN LOSS (dB) 0 5 10 15 20 25 RELATIVE ATTENUATION (dB) 30 Relative Phase RELATIVE PHASE (DEG) 45 40 35 30 25 20 15 10 5 0 -5 0 2 4 6 8 10 FREQUENCY (GHz) 18 dB 12 dB 9 dB 3 dB 12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Web Site: www.hittite.com 2 - 21 HMC121G8 MICROWAVE CORPORATION HMC121G8 SMT VOLTAGE-VARIABLE ATTENUATOR DC - 8 GHz FEBRUARY 2001 Input Third Order Intercept vs. Attenuation 30 THIRD ORDER INTERCEPT (dBm) 25 Reference 20 10 dB 15 3 dB Input Second Order Intercept vs. Attenuation 60 SECOND ORDER INTERCEPT (dBm) 50 Reference 40 6 dB 30 3 dB 2 SMT ATTENUATORS 10 6 dB 5 0 0.1 1 10 FREQUENCY (GHz) 20 10 dB 10 0 0.1 1 10 FREQUENCY (GHz) 0.25 dB Compression vs. Attenuation 15 0.25 dB COMPRESSION (dBm) 1 dB Compression vs. Attenuation 20 1 dB COMPRESSION (dBm) 10 Reference 5 10 dB 0 6 dB 15 Reference 10 10 dB -5 5 6 dB 0 -10 0 0.1 1 10 FREQUENCY (GHz) 0 0.1 1 10 FREQUENCY (GHz) Second Harmonic vs. Attenuation 65 SECOND HARMONIC (dBc) 60 Reference 55 50 45 10 dB 40 6 dB 35 30 3 dB 25 0 0.1 1 10 FREQUENCY (GHz) 12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Web Site: www.hittite.com 2 - 22 HMC121G8 MICROWAVE CORPORATION HMC121G8 SMT VOLTAGE-VARIABLE ATTENUATOR DC - 8 GHz FEBRUARY 2001 Schematic 50 50 Absolute Maximum Ratings RF Input +16dBm +1.0 to -6.0 Vdc -65 to +150 deg C -55 to +125 deg C RF2 RF1 Control Voltage Range Storage Temperature Operating Temperature 500 500 500 2 SMT ATTENUATORS 0.015 +/-0.003 (0.38 +/-0.08) 0.400 (10.16) 8 PLCS 500 V2 I O V1 Outline Drawing ORIENTATION TAB PIN 1 RFI GND 0.180 SQ (4.57 SQ) MAX RF2 PIN 8 0.150 (3.81) TYP 0.050 (1.27) TYP V2 I HMC 121G8 GND V1 O 0.070 (1.78) MAX MAX 0.005 +/-0.002 (0.13 +/-0.05) 8 PLCS 0.004 0.10 COPLANARITY 0.070 +/-0.020 (1.78 +/-0.51) 8 PLCS CASE BOTTOM IS GROUND 1. MATERIAL: A) PACKAGE BODY - ALUMINA LOADED BOROSILICATE GLASS B) LEADS, BASE, & COVER - ASTM F - 15 ALLOY 2. PLATING: ELECTROLYTIC GOLD 50 MICRO INCHES MINIMUM 3. DIMENSIONS ARE IN INCHES (MILLIMETERS), UNLESS OTHERWISE SPECIFIED TOL. ARE 0.005(0.13) 12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Web Site: www.hittite.com 2 - 23 HMC121G8 MICROWAVE CORPORATION HMC121G8 SMT VOLTAGE-VARIABLE ATTENUATOR DC - 8 GHz FEBRUARY 2001 Single-Line Control Driver 50 50 RF1 RF2 2 SMT ATTENUATORS 500 500 500 500 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 - 24 HMC121G8 MICROWAVE CORPORATION HMC121G8 SMT VOLTAGE-VARIABLE ATTENUATOR DC - 8 GHz FEBRUARY 2001 NOTES: 2 SMT ATTENUATORS 12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Web Site: www.hittite.com 2 - 25 |
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