HMC346MS8G / 346MS8GE v07.1008 ATTENUATORS - SMT 5 GaAs MMIC SMT VOLTAGE-VARIABLE ATTENUATOR, DC - 8 GHz Typical Applications Features This attenuator is ideal for use as a VVA for DC - 8 GHz applications: Wide Bandwidth: DC - 8 GHz • Point-to-Point Radio 32 dB Attenuation Range Low Phase Shift vs. Attenuation • VSAT Radio General Description Functional Diagram The HMC346MS8G & HMC346MS8GE are absorptive Voltage Variable Attenuators (VVA) in 8 lead surface-mount packages 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 point-to-point and VSAT radios. Electrical Specifi cations, TA = +25° C, 50 ohm system Parameter Typical Max Units 1.5 2.5 dB DC - 8 GHz Attenuation Range DC - 8 GHz 27 32 dB Return Loss DC - 8 GHz 5 10 dB tRISE, tFALL (10/90% RF) tON, tOFF (50% CTL to 10/90% RF) 2 8 ns ns Input Power for 0.25 dB Compression (0.5 - 8 GHz) Min. Atten. Atten. >2 dB +8 -2 dBm dBm Input Third Order Intercept (0.5 - 8 GHz) (Two-tone Input Power = -8 dBm Each Tone) Min. Atten. Atten. >2 dB +25 +10 dBm dBm Switching Characteristics 5 - 102 Min Insertion Loss 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 HMC346MS8G / 346MS8GE v07.1008 GaAs MMIC SMT VOLTAGE-VARIABLE ATTENUATOR, DC - 8 GHz -1 -10 -2 T+25C T -40C T+85C -20 -30 -40 -4 0 1 2 3 4 5 6 7 8 9 0 10 1 2 3 0 0 -5 -0.5 CONTROL VOLTAGE (Vdc) RETURN LOSS (dB) 5 6 -10 -15 -20 MIN 15 dB MAX 2 3 4 5 6 7 8 9 V2 +25C -2 -2.5 0 10 5 10 15 V1 +25C 20 V1 -40C 25 30 RELATIVE ATTENUATION (dB) Relative Attenuation vs. Control Voltage @ 8 GHz Relative Phase 140 0 CONTROL VOLTAGE (Vdc) max 25 dB 30 dB 120 RELATIVE PHASE (DEG) 10 V2 +85C -1.5 FREQUENCY (GHz) 20 dB 100 15 dB 10 dB 80 9 V2 -40C V1 +85C 1 8 -1 -3 -30 0 7 Relative Attenuation vs. Control Voltage @ 4 GHz Return Loss vs. Attenuation -25 4 FREQUENCY (GHz) FREQUENCY (GHz) ATTENUATORS - SMT 0 ATTENUATION (dB) INSERTION LOSS (dB) 0 -3 5 Relative Attenuation Insertion Loss vs. Temperature 5 dB 60 40 20 -0.5 V2 -40C -1 V2 +25C V2 +85C -1.5 -2 -2.5 V1 +85C 0 V1 +25C V1 -40C -3 0 1 2 3 4 5 6 FREQUENCY (GHz) 7 8 9 10 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 - 103 HMC346MS8G / 346MS8GE v07.1008 GaAs MMIC SMT VOLTAGE-VARIABLE ATTENUATOR, DC - 8 GHz Input Third Order Intercept vs Attenuation* Input Second Order Intercept vs. Attenuation* 70 30 SECOND ORDER INTERCEPT POINT (dBm) THIRD ORDER INTERCEPT POINT (dBm) ATTENUATORS - SMT 5 25 0 dB 3 dB 6 dB 10 dB 20 15 10 60 50 40 30 0 dB 3 dB 6 dB 10 dB 20 10 5 0 1 2 3 4 5 6 7 0 8 1 2 3 FREQUENCY (GHz) 0.25 dB Compression vs. Attenuation 5 6 8 20 0 dB (REF) 5 dB 15 INPUT P1dB (dBm) 15 10 5 10 5 0 0 dB (REF) 5 dB 0 -5 -5 0 1 2 3 4 5 6 7 8 0 1 2 3 FREQUENCY (GHz) 4 5 6 FREQUENCY (GHz) Second Harmonic vs. Attenuation SECOND HARMONIC (dBc) 80 70 60 50 40 0 dB 3 dB 30 6 dB 10 dB 20 0 1 2 3 4 5 6 7 8 FREQUENCY (GHz) *Two-tone input power = -8 dBm each tone, 1 MHz spacing. 5 - 104 7 1 dB Compression vs. Attenuation 20 INPUT.25dB COMPRESSION (dBm) 4 FREQUENCY (GHz) 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 7 8 HMC346MS8G / 346MS8GE v07.1008 GaAs MMIC SMT VOLTAGE-VARIABLE ATTENUATOR, DC - 8 GHz RF Input Power +18 dBm Control Voltage Range +1 to -5 V Storage Temperature -65 to +150 °C Operating Temperature -40 to +85 °C ESD Sensitivity (HBM) Class 1A ELECTROSTATIC SENSITIVE DEVICE OBSERVE HANDLING PRECAUTIONS Outline Drawing ATTENUATORS - SMT 5 Absolute Maximum Ratings NOTES: 1. LEADFRAME MATERIAL: COPPER ALLOY 2. DIMENSIONS ARE IN INCHES [MILLIMETERS]. 3. DIMENSION DOES NOT INCLUDE MOLDFLASH OF 0.15mm PER SIDE. 4. DIMENSION DOES NOT INCLUDE MOLDFLASH OF 0.25mm PER SIDE. 5. ALL GROUND LEADS AND GROUND PADDLE MUST BE SOLDERED TO PCB RF GROUND. Package Information Part Number Package Body Material Lead Finish MSL Rating HMC346MS8G Low Stress Injection Molded Plastic Sn/Pb Solder MSL1 HMC346MS8GE RoHS-compliant Low Stress Injection Molded Plastic 100% matte Sn MSL1 Package Marking [3] [1] H346 XXXX [2] H346 XXXX [1] Max peak reflow temperature of 235 °C [2] Max peak reflow temperature of 260 °C [3] 4-Digit lot number XXXX 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 - 105 HMC346MS8G / 346MS8GE v07.1008 GaAs MMIC SMT VOLTAGE-VARIABLE 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 Ohm. 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 N/C Not Connected. Interface Schematic Single-Line Control Driver 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 - 106 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 HMC346MS8G / 346MS8GE v07.1008 GaAs MMIC SMT VOLTAGE-VARIABLE ATTENUATOR, DC - 8 GHz 5 ATTENUATORS - SMT Evaluation PCB List of Materials for Evaluation PCB 104091 [1] Item Description J1 - J2 PCB Mount SMA RF Connector J3 - J7 DC PIN U1 HMC346MS8G / HMC346MS8GE PCB [2] 104089 Eval Board [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 - 107