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| MICROWAVE CORPORATION HMC173MS8 General Description The HMC173MS8 is a miniature absorptive voltage variable attenuator in an 8lead 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 800 MHz and 1600 MHz. 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. Min 800-1000 MHz 1000-1600 MHz 1600-2000 MHz 800-1000 MHz 1000-1600 MHz 1600-2000 MHz 800-1000 MHz 1000-1600 MHz 800-1000 MHz 1000-1600 MHz 1600-2000 MHz Min Atten. Atten.>2.0 Min Atten. Atten.>2.0 Min Atten. Atten.>2.0 800-2000 MHz 21 10 30 15 45 27 25 GaAs MMIC VOLTAGE VARIABLE ATTENUATOR 800-2000 MHz FEBRUARY 2001 Features SINGLE POSITIVE VOLTAGE CONTROL: 0 to +3V HIGH ATTENUATION RANGE: >50 dB @ 0.9 GHz 2 SMT ATTENUATORS HIGH P1dB COMPRESSION POINT: +16 dBm ULTRA SMALL PACKAGE: MSOP Guaranteed Performance Vdd = +4.0 Vdc, 50 Ohm System, -40 to +85C Parameter Insertion Loss (Min. Atten.) (V CTL = 0.0 Vdc) Attenuation Range (V CTL = 0 to +3 V) Flatness (Peak to Peak) Return Loss (V CTL = 0 to +3 V) Input Power for 0.1 dB Compression (825 MHz) Input Power for 1.0 dB Compression (825 MHz) Input Third Order Intercept 825 MHz, two tones @ +5.0 dBm Switching Characteristics tRISE, tFALL (10/90% RF) tON, tOFF (50% CTL to 10/90% RF) Typical 1.8 2.6 3.2 52 32 30 0.15 0.25 12 8 7 19 9 25 16 37 21 1.0 1.2 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 S S 6 5 5 12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Web Site: www.hittite.com 2 - 26 HMC173MS8 MICROWAVE CORPORATION HMC173MS8 VOLTAGE VARIABLE ATTENUATOR 800-2000 MHz FEBRUARY 2001 Attenuation vs. Control Voltage @900 and 1900 MHz 0 -10 Input IP3 vs. Control Voltage @825 MHz 40 825 MHz INPUT IP3 (dBm) 35 30 25 +85C 20 15 10 -40C ATTENUATION (dB) -20 1900 MHz -30 -40 825 MHz 2 SMT ATTENUATORS +25C -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 MHz 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 MHz Input Power For 1 dB Compression Point Test Condition (825MHz) Min. Attenuation Max. 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 Worst Case P1dB @ Typical V CTL +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 ATTENUATION (dB) RETURN LOSS (dB) -20 -30 -40 -50 -60 -70 0.6 0.8 1 1.2 1.4 1.6 1.8 2 -5 0V -10 2V 2.25V -15 3V -20 0.6 0.8 1 1.2 1.4 1.6 1.8 2 FREQUENCY (GHz) FREQUENCY (GHz) S - Parameter data is available On-Line at www.hittite.com 12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Web Site: www.hittite.com 2 - 27 MICROWAVE CORPORATION HMC173MS8 HMC173MS8 VOLTAGE VARIABLE ATTENUATOR 800-2000 MHz FEBRUARY 2001 Typical Performance for 800-1000 MHz Applications Attenuation vs. Control Voltage 825 MHz Return Loss vs. Control Voltage 825 MHz 0 -2 +85C -40C 2 SMT ATTENUATORS ATTENUATION (dB) 0 -10 -20 -30 -40 -50 -60 0 0.5 1 1.5 2 2.5 3 CONTROL VOLTAGE (V) +25C RETURN LOSS (dB) -4 -6 -8 -10 -12 -14 -16 -18 -20 0 0.5 1 -40C and +85C +25C 1.5 2 2.5 3 CONTROL VOLTAGE (V) Typical Performance for 1800-1900 MHz Applications Attenuation vs. Control Voltage 1900 MHz 0 -5 Return Loss vs. Control Voltage 1900 MHz 0 -2 RETURN LOSS (dB) ATTENUATION (dB) -10 -15 -20 -25 -30 -35 0 0.5 1 +25C -40C +85C -4 -6 -8 -10 -12 -14 -16 -18 -20 0 0.5 1 1.5 2 +25C +85C -40C 1.5 2 2.5 3 2.5 3 CONTROL VOLTAGE (V) CONTROL VOLTAGE (V) 12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Web Site: www.hittite.com 2 - 28 MICROWAVE CORPORATION HMC173MS8 FEBRUARY 2001 HMC173MS8 VOLTAGE VARIABLE ATTENUATOR 800-2000 MHz Functional Diagram RF2 GND V dd N/C Control and Bias Voltages VCTL Vdd 0 to +3.0Vdc @ -100A to +100A +4.0Vdc +/- 0.1Vdc @ +100A 2 Absolute Maximum Ratings PIN 1 RF1 GND VCTL N/C VCTL Vdd -0.2 Vdc to Vdd +8 Vdc +29 dBm +21 dBm -65 to +150 deg. C Min Attenuation Att. > 2 dB * NOTE: DC blocking capacitors are required for each RF port. Capacitor value determines lowest frequency of operation. Maximum Input Power Vdd = +4.0 Vdc Storage Temperature Operating Temperature -40 to +85 deg. C Outline Drawing RF2 Gnd Vdd N/C 0.116/ 0.120 (2.95/ 3.05) LOT NUMBER 0.116/ 0.120 (2.95/ 3.05) HMC 173 Gnd VCTL RF1 N/C 0.188/ 0.196 (4.78/ 4.98) XXXX YYWW DATE CODE YY= YEAR WW= WEEK PIN 1 (REF) PIN 1 0.032/ 0.036 (0.81/ 0.91) 0.038/ 0.042 (0.96/ 1.07) 0.0256 TYP (0.65) 0 to 5 deg 0.012 TYP (0.30) 0.005/ 0.007 (0.13/ 0.18) 0.021 MIN TYP (0.53) 1. MATERIAL: A) PACKAGE BODY - LOW STRESS INJECTION - MOLDED PLASTIC, SILICA & SILICONE IMPREGNATED. B) LEADFRAME MATERIAL: COPPER ALLOY 2. PLATING: LEAD - TIN SOLDER PLATE 3. DIMENSIONS ARE IN INCHES (MILLIMETERS), UNLESS OTHERWISE SPECIFIED TOL. ARE 0.005(0.13) 4. TAPE AND REEL SHIPMENT PACKAGING AVAILABLE, SEE PAGE 10 - 1 12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Web Site: www.hittite.com 2 - 29 SMT ATTENUATORS MICROWAVE CORPORATION HMC173MS8 HMC173MS8 VOLTAGE VARIABLE ATTENUATOR 800-2000 MHz FEBRUARY 2001 Attenuation Linearizing Control Circuit For The HMC173MS8 Voltage Variable Attenuator 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. 2 SMT ATTENUATORS Diode and resistor values which define the op-amp gain, and breakpoint were selected to optimize a measured production lot of attenuators at 825 MHz. 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, then 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 MHz attenuation applications. A similar approach may be used at other frequencies by adjusting RI - R9 resistor values. Required Parts List Part AD822 R1 R2 R3 R4 R5 R6 R7 R8 R9 D1, D2 Schematic 0 +5V R6 R5 VCTL IN R8 0 R7 R1 3 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 Digikey +5 -5V D1 R4 R9 7 U3 6 + V+ AD820/AD V2_ 4 D2 VCTL OUT -5V R2 R3 Return Loss vs. Control Voltage @ 825 MHz -12 -13 RETURN LOSS (dB) Attenuation vs. Control Voltage @ 825 MHz 0 -10 Without Linearizer With Linearizer -14 -15 -16 -17 -18 -19 0.5 1 1.5 With Linearizer Without Linearizer ATTENUATION (dB) -20 -30 -40 -50 -60 2 2.5 3 0 1 2 3 CONTROL VOLTAGE (Vdc) CONTROL VOLTAGE (Vdc) 12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Web Site: www.hittite.com 2 - 30 HMC173MS8 MICROWAVE CORPORATION HMC173MS8 VOLTAGE VARIABLE ATTENUATOR 800-2000 MHz FEBRUARY 2001 Evaluation Circuit Board 2 SMT ATTENUATORS 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 below. 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 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) 12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Web Site: www.hittite.com 2 - 31 |
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