HMC121G8 v01.0801 MICROWAVE CORPORATION GaAs MMIC SMT VOLTAGE-VARIABLE ATTENUATOR, DC - 8 GHz ATTENUATORS - SMT 2 Typical Applications Features • Base Station Infrastructure Wide Bandwidth: DC - 8 GHz • Portable Wireless CATV & DBS Low Phase Shift vs. Attenuation • MMDS & Wireless LAN 30 dB Attenuation Range • Wireless Local Loop Simplified Voltage Control • Fiber Optics, Military, Space & Test Equipment Functional Diagram General Description The HMC121G8 is an absorptive voltage variable attenuator provided in a surface-mount hermetic package. It features an on-chip reference attenuator for use with an 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. Electrical Specifications, TA = +25° C, 50 ohm system Parameter Insertion Loss Min. DC - 4 GHz: DC - 8 GHz: Attenuation Range Return Loss DC - 4 GHz: DC - 8 GHz: Switching Characteristics 2 - 20 tRISE, tFALL (10/90% RF) tON, tOFF (50% CTL to 10/90% RF) Typ. Max. Units 1.5 2 3.0 3.5 dB dB 25 30 dB 10 7 15 10 dB dB 3 6 ns ns Input Power for 0.25 dB Compression (0.5 - 8 GHz) Min Atten: Atten >2 dB: +10 -2 dBm dBm Input Third Order Intercept (Two-tone Input Power = -8 dBm Each Tone Min Atten: Atten >2 dB: +25 +10 dBm dBm For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Visit us at www.hittite.com, or Email at [email protected] HMC121G8 v01.0801 MICROWAVE CORPORATION GaAs MMIC SMT VOLTAGE-VARIABLE ATTENUATOR, DC - 8 GHz Relative Attenuation 0 -1 -10 -2 -3 -4 2 -20 -30 -40 -5 0 2 4 6 8 0 10 2 4 FREQUENCY (GHz) 8 10 Relative Attenuation vs. Control Voltage Return Loss 0 CONTROL VOLTAGE 0 -10 -20 -30 -0.5 -1 V2 V1 -1.5 -2 -2.5 -3 0 2 4 6 8 0 10 5 FREQUENCY (GHz) 10 15 20 25 RELATIVE ATTENUATION (dB) 30 Relative Phase RELATIVE PHASE (DEG) RETURN LOSS (dB) 6 FREQUENCY (GHz) ATTENUATORS - SMT 0 ATTENUATION (dB) INSERTION LOSS (dB) Insertion Loss 45 40 35 30 25 18 dB 20 12 dB 9 dB 15 10 5 3 dB 0 -5 0 2 4 6 8 10 FREQUENCY (GHz) For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Visit us at www.hittite.com, or Email at [email protected] 2 - 21 HMC121G8 v01.0801 MICROWAVE CORPORATION GaAs MMIC SMT VOLTAGE-VARIABLE ATTENUATOR, DC - 8 GHz Input Third Order Intercept vs. Attenuation Input Second Order Intercept vs. Attenuation SECOND ORDER INTERCEPT (dBm) 60 25 Reference 20 10 dB 3 dB 15 10 6 dB 5 50 Reference 40 3 dB 6 dB 30 20 10 dB 10 0 0.1 1 10 0 0.1 FREQUENCY (GHz) 1 10 FREQUENCY (GHz) 1 dB Compression vs. Attenuation 0.25 dB Compression vs. Attenuation 20 1 dB COMPRESSION (dBm) 15 0.25 dB COMPRESSION (dBm) ATTENUATORS - SMT 2 THIRD ORDER INTERCEPT (dBm) 30 10 Reference 5 10 dB 0 6 dB -5 -10 15 Reference 10 10 dB 5 6 dB 0 0 0.1 1 10 0 FREQUENCY (GHz) 0.1 1 FREQUENCY (GHz) Second Harmonic vs. Attenuation Absolute Maximum Ratings 65 RF Input Power +16 dBm 55 Control Voltage Range +1.0 to -6.0 Vdc 50 Storage Temperature -65 to +150 deg C Operating Temperature -55 to +125 deg C SECOND HARMONIC (dBc) 60 Reference 45 10 dB 40 6 dB 35 30 3 dB 25 0 0.1 1 10 FREQUENCY (GHz) 2 - 22 For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Visit us at www.hittite.com, or Email at [email protected] 10 HMC121G8 v01.0801 MICROWAVE CORPORATION GaAs MMIC SMT VOLTAGE-VARIABLE ATTENUATOR, DC - 8 GHz Outline Drawing PIN 8 0.180 SQ (4.57 SQ) 1. MATERIAL: A) PACKAGE BODY - ALUMINA LOADED BOROSILI CATE GLASS B) LEADS, BASE, & COVER - ASTM F - 15 ALLOY 2. PLATING: ELECTROLYTIC GOLD 50 MICROINCHES MINIMUM. 3. DIMENSIONS ARE IN INCHES (MILLIMETERS). UNLESS OTHERWISE SPECIFIED TOL. ARE ±0.005 ( ±0.13). MAX RFI RF2 HMC 121G8 GND 0.150 (3.81) TYP 0.050 (1.27) TYP V2 GND V1 I O 0.015 +/-0.003 (0.38 +/-0.08) 0.400 (10.16) 8 PLCS MAX 0.070 (1.78) 0.005 +/-0.002 (0.13 +/-0.05) MAX 8 PLCS 0.004 0.10 2 ATTENUATORS - SMT ORIENTATION TAB PIN 1 COPLANARITY 0.070 +/-0.020 (1.78 +/-0.51) 8 PLCS CASE BOTTOM IS GROUND Single-Line Control Driver 50 50 RF1 RF2 500 500 500 500 V2 I O V1 CTL +5V 500 1N4148 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). For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Visit us at www.hittite.com, or Email at [email protected] 2 - 23