HMC173MS8 MICROWAVE CORPORATION GaAs MMIC VOLTAGE VARIABLE ATTENUATOR 800-2000 MHz FEBRUARY 2001 Features General Description SINGLE POSITIVE VOLTAGE CONTROL: 0 to +3V 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. HIGH ATTENUATION RANGE: >50 dB @ 0.9 GHz SMT ATTENUATORS 2 HIGH P1dB COMPRESSION POINT: +16 dBm ULTRA SMALL PACKAGE: MSOP Guaranteed Performance Vdd = +4.0 Vdc, 50 Ohm System, -40 to +85°C Parameter Min Insertion Loss (Min. Atten.) (V CTL = 0.0 Vdc) 800-1000 MHz 1000-1600 MHz 1600-2000 MHz Attenuation Range (V CTL = 0 to +3 V) 800-1000 MHz 1000-1600 MHz 1600-2000 MHz Flatness (Peak to Peak) Return Loss (V CTL = 0 to +3 V) 800-1000 MHz 1000-1600 MHz 800-1000 MHz 1000-1600 MHz 1600-2000 MHz Input Power for 0.1 dB Compression (825 MHz) Min Atten. Atten.>2.0 Input Power for 1.0 dB Compression (825 MHz) Min Atten. Atten.>2.0 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) Min Atten. Atten.>2.0 2 - 26 Max Units 1.8 2.6 3.2 2.3 3.1 3.7 dB dB dB 45 27 25 52 32 30 dB dB dB 6 5 5 ± 0.15 ± 0.25 12 8 7 dB dB dB dB dB 19 9 dBm dBm 21 10 25 16 dBm dBm 30 15 37 21 dBm dBm 1.0 1.2 µS µS 800-2000 MHz 12 Elizabeth Drive, Chelmsford, MA 01824 Typical Phone: 978-250-3343 Fax: 978-250-3373 Web Site: www.hittite.com HMC173MS8 MICROWAVE CORPORATION HMC173MS8 VOLTAGE VARIABLE ATTENUATOR 800-2000 MHz FEBRUARY 2001 Attenuation vs. Control Voltage @900 and 1900 MHz Input IP3 vs. Control Voltage @825 MHz 0 ATTENUATION (dB) -20 1900 MHz -30 -40 825 MHz -50 35 -40C 30 25 +25C 15 10 -60 0 0.5 1 1.5 2 2.5 0 3 0.5 1 1.5 2 2.5 3 CONTROL VOLTAGE (V) CONTROL VOLTAGE (V) Attenuation vs. Temperature Normalized to +25°C @825 MHz NORMALIZED ATTENUATION (dB) 2 +85C 20 Input P1dB Compression @825 MHz 10 Input Power For 1 dB Compression Point 8 6 Test Condition (825MHz) 4 2 Vdd (Vdc) +25C +85C -40C Units Min. Attenuation 0.0 +4.0 26 24 25 dBm Max. Attenuation +3.0 +4.0 16.5 15 23 dBm Worst Case P1dB @ Typical V CTL +1.8 +4.0 16.5 15.5 14 dBm -40C 0 -2 +85C -4 -6 -8 -10 VCTL (Vdc) 0 0.5 1 1.5 2 2.5 3 CONTROL VOLTAGE (V) Broadband Return Loss vs. Control Voltage 0 -10 -1 -20 -2 -30 -3 -40 -4 -50 -5 -60 -6 -70 -7 0.6 0.8 1 1.2 1.4 1.6 1.8 0 2 RETURN LOSS (dB) 0 INSERTION LOSS (dB) ATTENUATION (dB) Broadband Attenuation and Insertion Loss -5 0V -10 2V 2.25V -15 3V -20 0.6 0.8 FREQUENCY (GHz) 1 1.2 1.4 1.6 1.8 2 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 SMT ATTENUATORS 825 MHz INPUT IP3 (dBm) 40 -10 HMC173MS8 MICROWAVE CORPORATION 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 0 -2 RETURN LOSS (dB) ATTENUATION (dB) -40C +85C -20 -30 -40 +25C -50 0 0.5 1 1.5 2 2.5 -4 -6 -40C and +85C -8 -10 -12 -14 -16 +25C -18 -20 -60 3 0 0.5 CONTROL VOLTAGE (V) 1 1.5 2 2.5 3 CONTROL VOLTAGE (V) Typical Performance for 1800-1900 MHz Applications Attenuation vs. Control Voltage 1900 MHz Return Loss vs. Control Voltage 1900 MHz 0 0 -2 -10 +85C -40C -15 RETURN LOSS (dB) -5 ATTENUATION (dB) SMT ATTENUATORS -10 -20 -25 +25C -30 -35 0 0.5 1 1.5 2 2.5 3 CONTROL VOLTAGE (V) 12 Elizabeth Drive, Chelmsford, MA 01824 2 - 28 -4 -6 +85C -8 -40C -10 -12 -14 +25C -16 -18 -20 0 0.5 1 1.5 2 2.5 3 CONTROL VOLTAGE (V) Phone: 978-250-3343 Fax: 978-250-3373 Web Site: www.hittite.com HMC173MS8 MICROWAVE CORPORATION HMC173MS8 VOLTAGE VARIABLE ATTENUATOR 800-2000 MHz FEBRUARY 2001 Functional Diagram RF2 GND V dd Control and Bias Voltages N/C VCTL 0 to +3.0Vdc @ -100µA to +100µA Vdd +4.0Vdc +/- 0.1Vdc @ +100µA Absolute Maximum Ratings PIN 1 RF1 GND VCTL N/C * NOTE: DC blocking capacitors are required for each RF port. Capacitor value determines lowest frequency of operation. VCTL -0.2 Vdc to Vdd Vdd +8 Vdc Maximum Input Power Vdd = +4.0 Vdc +29 dBm +21 dBm Storage Temperature -65 to +150 deg. C Min Attenuation Att. > 2 dB Operating Temperature -40 to +85 deg. C RF2 Gnd Vdd N/C Outline Drawing 0.116/ 0.120 (2.95/ 3.05) LOT NUMBER 0.188/ 0.196 (4.78/ 4.98) XXXX YYWW DATE CODE YY= YEAR WW= WEEK PIN 1 (REF) N/C RF1 PIN 1 Gnd VCTL HMC 173 0.116/ 0.120 (2.95/ 3.05) 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 2 HMC173MS8 MICROWAVE CORPORATION 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. 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 Schematic 0 Part Description +5V Manufacturer AD822 Op-Amp Analog Devices R1 10K ohms Panasonic R2 200K ohms Panasonic R3 7.5K ohms Panasonic R4 39K ohms Panasonic R5 220K ohms Panasonic R6 91K ohms Panasonic R7 910 ohms Panasonic R8 51 ohms Panasonic R9 100 ohms Panasonic D1, D2 LL4148 D-35 Digikey 3 VCTL IN R8 R1 0 7 U3 + V+ AD820/AD V2 _ 4 D2 6 VCTL OUT -5V R2 R7 R3 +5 D1 R4 -5V Attenuation vs. Control Voltage @ 825 MHz -12 0 -13 ATTENUATION (dB) -10 -14 Without Linearizer -15 -16 With Linearizer -17 Without Linearizer -20 With Linearizer -30 -40 -50 -18 -19 -60 0.5 1 1.5 2 2.5 3 CONTROL VOLTAGE (Vdc) 12 Elizabeth Drive, Chelmsford, MA 01824 2 - 30 R9 R6 R5 Return Loss vs. Control Voltage @ 825 MHz RETURN LOSS (dB) SMT ATTENUATORS 2 0 1 2 3 CONTROL VOLTAGE (Vdc) Phone: 978-250-3343 Fax: 978-250-3373 Web Site: www.hittite.com HMC173MS8 MICROWAVE CORPORATION HMC173MS8 VOLTAGE VARIABLE ATTENUATOR 800-2000 MHz FEBRUARY 2001 Evaluation Circuit Board 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 Grounded Co-Planar Waveguide (GCPW) Material FR4 Dielectric Thickness 0.028" (0.71 mm) 50 Ohm Line Width 0.037" (0.94 mm) Gap to Ground Edge 0.010" (0.25 mm) Ground VIA Hole Diameter 0.014" (0.36 mm) Connectors 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 SMT ATTENUATORS 2