HMC346C8 v02.1008 ATTENUATORS - SMT 5 GaAs MMIC SMT VOLTAGEVARIABLE ATTENUATOR, DC - 8 GHz Typical Applications Features The HMC346C8 is ideal for: Wide Bandwidth: DC - 8 GHz • Basestation Infrastructure Low Phase Shift vs. Attenuation • Fiber Optics & Broadband Telecom 30 dB Attenuation Range • Microwave Radio & VSAT Surface Mount Ceramic Package • Military Radios, Radar, & ECM • Test Instrumentation Functional Diagram General Description The HMC346C8 is an absorptive Voltage Variable Attenuator (VVA) in a non-hermetic surface-mount ceramic 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 Specifi cations, TA = +25° C, 50 ohm system Parameter Typical Max Units Insertion Loss DC - 6 GHz DC - 8 GHz Min 1.9 2.1 2.9 3.1 dB dB Attenuation Range DC - 8 GHz 30 dB Return Loss DC - 8 GHz 10 dB 2 8 ns ns +8 -2 dBm dBm +25 +10 dBm dBm Switching Characteristics tRISE, tFALL (10/90% RF) tON, tOFF (50% CTL to 10/90% RF) 5 - 78 Input Power for 0.25 dB Compression (0.5 - 8 GHz) Min. Atten. Atten. >2 dB Input Third Order Intercept (0.5 - 8 GHz) (Two-tone Input Power = -8 dBm Each Tone) Min. Atten. Atten. >2 dB 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 HMC346C8 v02.1008 GaAs MMIC SMT VOLTAGEVARIABLE ATTENUATOR, DC - 8 GHz 0 0 ATTENUATION (dB) INSERTION LOSS (dB) -5 -1 -2 +25C +85C -40C -3 -10 -15 -20 -25 -4 -30 -5 -35 0 1 2 3 4 5 6 7 8 9 0 10 1 2 3 FREQUENCY (GHz) 0 0 -5 -5 ATTENUATION (dB) RETURN LOSS (dB) 5 6 7 8 9 10 Relative Attenuation, Control Voltage Optimized for 8 GHz Operation Return Loss vs. Attenuation -10 -15 -20 5dB 10dB 15dB 20dB 25dB 30dB -25 -30 -10 -15 -20 -25 -30 -35 -35 0 1 2 3 4 5 6 7 8 9 10 0 1 2 FREQUENCY (GHz) 3 4 5 6 7 8 9 10 FREQUENCY (GHz) Relative Attenuation vs. Control Voltage @ 4 GHz Relative Attenuation vs. Control Voltage @ 8 GHz 0 0 V1 +25C V2 +25C V1 +85C V2 +85C V1 -40C V2 -40C -0.5 -1 CONTROL VOLTAGE (Vdc) CONTROL VOLTAGE (Vdc) 4 FREQUENCY (GHz) ATTENUATORS - SMT 5 Relative Attenuation, Control Voltage Optimized for 4 GHz Operation Insertion Loss vs. Temperature -1.5 -2 -2.5 -3 V1 +25C V2 +25C V1 +85C V2 +85C V1 -40C V2 -40C -0.5 -1 -1.5 -2 -2.5 -3 0 5 10 15 20 RELATIVE ATTENUATION (dB) 25 30 0 5 10 15 20 25 30 RELATIVE ATTENUATION (dB) 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 5 - 79 HMC346C8 v02.1008 GaAs MMIC SMT VOLTAGEVARIABLE ATTENUATOR, DC - 8 GHz Input Third Order Intercept vs. Attenuation* Relative Phase 30 140 120 25 5dB 10dB 15dB 20dB 25dB 30dB 100 80 IP3 (dBm) RELATIVE PHASE (DEG) 60 0 dB 3 dB 10 dB 6 dB 20 15 40 10 20 5 0 0 1 2 3 4 5 6 7 8 9 0 10 1 2 3 Input Second Order Intercept vs. Attenuation* IP2 (dBm) 5 6 7 8 70 80 60 70 40 30 0 dB 3 dB 6 dB 10 dB 20 10 10 0 dB 60 10 dB 50 40 3 dB 6 dB 30 20 0 1 2 3 4 5 6 7 8 9 10 0 1 2 3 FREQUENCY (GHz) 4 5 6 7 8 FREQUENCY (GHz) 1 dB Compression vs. Attenuation 0.25 dB Compression vs. Attenuation 15 20 16 P1dB (dBm) 10 6 dB 0 dB (REF) 5 0 12 6dB 0dB 8 4 0 -5 0 1 2 3 4 5 6 7 8 FREQUENCY (GHz) 9 10 0 1 2 3 4 5 6 7 8 FREQUENCY (GHz) *Two-tone input power = -8 dBm each tone. 5 - 80 9 Second Harmonic vs. Attenuation 50 INPUT 0.25 dB COMPRESSION (dBm) 4 FREQUENCY (GHz) FREQUENCY (GHz) SECOND HARMONIC (dBc) ATTENUATORS - SMT 5 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 9 10 HMC346C8 v02.1008 GaAs MMIC SMT VOLTAGEVARIABLE ATTENUATOR, DC - 8 GHz RF Input Power +18 dBm Control Voltage Range +1.0 to -5V Channel Temperature 150 °C ELECTROSTATIC SENSITIVE DEVICE OBSERVE HANDLING PRECAUTIONS Thermal Resistance 190 °C/W Storage Temperature -65 to +150 °C Operating Temperature -40 to +85 °C ESD Sensitivity (HBM) Class 1A ATTENUATORS - SMT 5 Absolute Maximum Ratings 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 5 - 81 HMC346C8 v02.1008 GaAs MMIC SMT VOLTAGEVARIABLE ATTENUATOR, DC - 8 GHz ATTENUATORS - SMT 5 Pin Descriptions Pin Number Function Description 1, 8 RF1, RF2 This pin is DC coupled and matched to 50 Ohms. Blocking capacitors are required if RF line potential is not equal to 0V. 2, 7 GND This pin must be DC grounded. 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. Interface Schematic 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.) 5 - 82 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 HMC346C8 v02.1008 GaAs MMIC SMT VOLTAGEVARIABLE ATTENUATOR, DC - 8 GHz 5 ATTENUATORS - SMT Evaluation PCB List of Materials for Evaluation PCB 109023 [1] Item Description J1 - J2 PCB Mount SMA RF Connector J3 - J7 DC PIN U1 HMC346C8 PCB [2] Eval Board 102084-5 [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 5 - 83