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| v01.0801 HMC173MS8 GaAs MMIC VOLTAGE-VARIABLE ATTENUATOR, 0.8 - 2.0 GHz Typical Applications Features Single Positive Voltage Control: 0 to +3V High Attenuation Range: >50 dB @ 0.9 GHz High P1dB Compression Point: +16 dBm Ultra Small Package: MSOP 9 ATTENUATORS - SMT The HMC173MS8 is ideal for 0.8 - 2.0 GHz Applications: * Base Station Infrastructure * Portable Wireless Functional Diagram General Description The HMC173MS8 is an absorptive voltage variable attenuator in an 8-lead MSOP package. The device operates with a positive supply voltage and a positive control voltage. Unique features include a high dynamic attenuation range and excellent power handling performance through all attenuation states. The HMC173MS8 is ideal for operation in wireless applications between 0.8 GHz and 1.6 GHz. 1.7 to 2.0 GHz operation is possible, with a reduced maximum attenuation of 30 dB and increased VSWR. The HMC173MS8 can be used with an external driver circuit for improved linearity of attenuation. Electrical Specifications, TA = +25 C, Vdd = +4.0 Vdc, 50 Ohm System Parameter Insertion Loss (Min. Atten.) (VCTL = 0.0 Vdc) 0.8 - 1.0 GHz 1.0 - 1.6 GHz 1.6 - 2.0 GHz 0.8 - 1.0 GHz 1.0 - 1.6 GHz 1.6 - 2.0 GHz 0.8 - 1.0 GHz 1.0 - 1.6 GHz 0.8 - 1.0 GHz 1.0 - 1.6 GHz 1.6 - 2.0 GHz Min Atten. Atten. >2.0 Min Atten. Atten. >2.0 Min Atten. Atten. >2.0 21 10 30 15 6 5 5 45 27 25 Min. Typ. 1.8 2.6 3.2 52 32 30 0.15 0.25 12 8 7 19 9 25 16 37 21 Max. 2.3 3.1 3.7 Units dB dB dB dB dB dB dB dB dB dB dB dBm dBm dBm dBm dBm dBm Attenuation Range (VCTL = 0 to +3 V) Flatness (Peak to Peak) Return Loss (VCTL = 0 to +3 V) Input Power for 0.1 dB Compression (.825 GHz) Input Power for 1.0 dB Compression (.825 GHz) Input Third Order Intercept .825 GHz, Two-tone Input Power = +5.0 dBm Each Tone Switching Characteristics tRISE, tFALL (10/90% RF) tON, tOFF (50% CTL to 10/90% RF) 0.8 - 2.0 GHz 1.0 1.2 S S 9-2 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 Order Online at www.hittite.com v01.0801 HMC173MS8 GaAs MMIC VOLTAGE-VARIABLE ATTENUATOR, 0.8 - 2.0 GHz Attenuation vs. Control Voltage @ 0.9 and 1.9 GHz 0 -10 ATTENUATION (dB) -20 1.9 GHz Input IP3 vs. Control Voltage @ .825 GHz 40 825 MHz INPUT IP3 (dBm) 35 30 25 +85C 20 +25C 15 10 -40C 9 ATTENUATORS - SMT 9-3 -30 -40 0.9 GHz -50 -60 0 0.5 1 1.5 2 2.5 3 CONTROL VOLTAGE (V) 0 0.5 1 1.5 2 2.5 3 CONTROL VOLTAGE (V) Attenuation vs. Temperature Normalized to +25C @ .825 GHz NORMALIZED ATTENUATION (dB) 10 8 6 4 2 0 -2 -4 -6 -8 -10 0 0.5 1 1.5 2 2.5 3 -40C Input P1dB Compression@ .825 GHz Input Power for 1 dB Compression Point Test Condidition (.825 GHz) Min. Attenuation VCTL (Vdc) 0.0 +3.0 Vdd (Vdc) +4.0 +4.0 +25C 26 16.5 +85C 24 15 -40C 25 23 Units dBm dBm +85C Max. Attenuation Worst Case P1dB @ Typical VCTL +1.8 +4.0 16.5 15.5 14 dBm CONTROL VOLTAGE (V) Broadband Attenuation and Insertion Loss 0 -10 0 Broadband Return Loss vs. Control Voltage 0 INSERTION LOSS (dB) -1 -2 -3 -4 -5 -6 -7 RETURN LOSS (dB) ATTENUATION (dB) -5 0V -10 2V 2.25V -15 3V -20 0.6 0.8 1 1.2 1.4 1.6 1.8 2 -20 -30 -40 -50 -60 -70 0.6 0.8 1 1.2 1.4 1.6 1.8 2 FREQUENCY (GHz) 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 Order Online at www.hittite.com v01.0801 HMC173MS8 GaAs MMIC VOLTAGE-VARIABLE ATTENUATOR, 0.8 - 2.0 GHz Typical Performance for 0.8 - 1.0 GHz Applications 9 ATTENUATORS - SMT Attenuation vs. Control Voltage @ .825 GHz 0 -10 ATTENUATION (dB) -20 -30 -40 -50 -60 0 0.5 1 1.5 2 2.5 3 CONTROL VOLTAGE (V) +25C +85C Return Loss vs. Control Voltage @ .825 GHz 0 -2 RETURN LOSS (dB) -40C -4 -6 -8 -10 -12 -14 -16 -18 -20 0 0.5 1 1.5 2 2.5 3 CONTROL VOLTAGE (V) -40C and +85C +25C Typical Performance for 1.8 - 1.9 GHz Applications Attenuation vs. Control Voltage @ 1.9 GHz 0 -5 RETURN LOSS (dB) ATTENUATION (dB) -10 -15 -20 -25 -30 -35 0 0.5 1 +25C -40C +85C Return Loss vs. Control Voltage @ 1.9 GHz 0 -2 -4 -6 -8 -10 -12 -14 -16 -18 -20 0 0.5 1 1.5 2 2.5 3 CONTROL VOLTAGE (V) +25C +85C -40C 1.5 2 2.5 3 CONTROL VOLTAGE (V) 9-4 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 Order Online at www.hittite.com v01.0801 HMC173MS8 GaAs MMIC VOLTAGE-VARIABLE ATTENUATOR, 0.8 - 2.0 GHz Absolute Maximum Ratings VCTL Vdd Maximum Input Power Vdd = +4.0 Vdc Storage Temperature Operating Temperature -0.2 Vdc to Vdd +8 Vdc +29 dBm +21 dBm -65 to +150 C -40 to +85 C Min. Attenuation Atten. >2 dB Control and Bias Voltage VCTL Vdd 0 to +3 Vdc @ -100 A to +100 A +4.0 Vdc +/- 0.1 Vdc @ +100 A 9 ATTENUATORS - SMT 9-5 *Note: DC blocking capacitors are required for each RF port. Capacitor value determines lowest frequency of operation. Outline Drawing NOTES: 1. PACKAGE BODY MATERIAL: LOW STRESS INJECTION MOLDED PLASTIC SILICA AND SILICON IMPREGNATED. 2. LEADFRAME MATERIAL: COPPER ALLOY 3. LEADFRAME PLATING: Sn/Pb SOLDER 4. DIMENSIONS ARE IN INCHES [MILLIMETERS]. 5. DIMENSION DOES NOT INCLUDE MOLDFLASH OF 0.15mm PER SIDE. 6. DIMENSION DOES NOT INCLUDE MOLDFLASH OF 0.25mm PER SIDE. 7. ALL GROUND LEADS MUST BE SOLDERED TO PCB RF GROUND. 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 Order Online at www.hittite.com v01.0801 HMC173MS8 GaAs MMIC VOLTAGE-VARIABLE ATTENUATOR, 0.8 - 2.0 GHz Attenuation Linearizing Control Circuit For The HMC173MS8 Voltage Variable Attenuator 9 ATTENUATORS - SMT A driver circuit to improve the attenuation linearity of the HMC173MS8 can be implemented with a simple op-amp configuration. A breakpoint linearization circuit will scale the voltage supplied to the control line of the HMC173MS8, so that a more linear attenuation vs. control voltage slope can be achieved. A -5V and +5V supply is required. Diode and resistor values which define the op-amp gain, and breakpoint were selected to optimize a measured production lot of attenuators at .825 GHz. R7 may be varied to optimize the performance of any given attenuator. If the input voltage to the linearizing circuit will not drop below 1.0V, the R9 and D2 may be omitted, and this will greatly reduce the overall power consumption of the driver circuit. The linearizing circuit has been optimized for .825 GHz attenuation applicaitons. A similar approach may be used at other frequencies by adjusting R1 - R9 resistor values. Required Parts List Part AD822 R1 R2 R3 R4 R5 R6 R7 R8 R9 D1, D2 Description Op-Amp 10K ohms 200K ohms 7.5K ohms 39K ohms 220K ohms 91K ohms 910 ohms 51 ohms 100 ohms LL4148 D-35 Manufacturer Analog Devices Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Digi-Key Application Circuit Return Loss vs. Control Voltage @ .825 GHz -12 -13 RETURN LOSS (dB) -14 -15 -16 -17 -18 -19 0.5 1 1.5 2 2.5 3 CONTROL VOLTAGE (Vdc) With Linearizer Without Linearizer Attenuation vs. Control Voltage @ .825 GHz 0 -10 ATTENUATION (dB) -20 -30 -40 -50 -60 0 1 2 3 CONTROL VOLTAGE (Vdc) With Linearizer Without Linearizer 9-6 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 Order Online at www.hittite.com v01.0801 HMC173MS8 GaAs MMIC VOLTAGE-VARIABLE ATTENUATOR, 0.8 - 2.0 GHz Evaluation Circuit Board 9 ATTENUATORS - SMT 9-7 The circuit board used in the final application should use RF circuit design techniques. Signal lines should have 50 ohm impedance while the package ground leads should be connected directly to the ground plane similar to that shown. A sufficient number of VIA holes should be used to connect the top and bottom ground planes. The evaluation circuit board as shown is available from Hittite Microwave Corporation upon request. Evaluation Circuit Board Layout Design Details Layout Technique Material Dielectric Thickness 50 Ohm Line Width Gap to Ground Edge Ground VIA Hole Diameter Connectors Grounded Co-Planar Waveguide (GCPW) FR4 0.028" (0.71 mm) 0.037" (0.94 mm) 0.010" (0.25 mm) 0.014" (0.36 mm) SMA-F (EF - Johnson P/N 142-0701-806) 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 Order Online at www.hittite.com |
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