Features OBSOLETE. = +25 C, Vdd = +3.3 Vdc, 50 Ohm System

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1 Typical Applications v1.1 ATTENUATOR, GHz Features The HMC473MS8 / HMC473MS8E is ideal for: Cellular, UMTS/3G Infrastructure Portable Wireless GPS Functional Diagram RoHS Compliant Product Single Positive Voltage Control: to +3V High Attenuation Range: GHz High P1 Compression Point: + m Ultra Small Package: MSOP8 Replaces HMC173MS8 General Description Electrical Specifications, T A = +2 C, Vdd = +3.3 Vdc, Ohm System Insertion Loss (Min. Atten.) (Vctl =. Vdc) Attenuation Range (Vctl = to +3 V) Return Loss (Vctl = to +3 V) Input Power for.1 Compression (.9 GHz) Input Power for 1. Compression (.9 GHz) Input Third Order Intercept (.9 GHz, Two-tone Input Power = +. m Each Tone) Switching Characteristics trise, tfall (1/9% RF) ton, toff (% CTL to 1/9% RF) The HMC473MS8 & HMC473MS8E are general purpose absorptive voltage variable attenuators in 8-lead MSOP packages. The devices operate with a +3.3V supply voltage and a to +3V control voltage. Unique features include a high dynamic attenuation range of up to 48 and excellent power handling performance through all attenuation states. The HMC473MS8 & HMC473MS8E are ideal for operation in wireless applications from.4 to 1.6 GHz. Operation from 1.7 to 2.2 GHz is possible with a reduced maximum attenuation of 29 to 32. Improved control voltage linearity vs. attenuation can be achieved with an external driver circuit. Parameter Min. Typ. Max. Units GHz.8-1. GHz GHz GHz GHz GHz.8-1. GHz GHz GHz GHz GHz.8-1. GHz GHz GHz GHz Min Atten. Atten. >2. Min Atten. Atten. >2. Min Atten. Atten. > GHz m m m m m m µs µs Alpha Road, Chelmsford, MA 1824 Phone: One Technology Way, Fax: P.O Box 916, Norwood, MA Phone: Order online at Application Support: Phone: 1-8-ANALOG-D

2 Insertion Loss vs. Temperature v1.1 ATTENUATOR, GHz Return Loss vs. Control Voltage INSERTION LOSS () FREQUENCY (GHz) Input IP3 vs. Control GHz INPUT IP3 (m) Input IP3 vs. Control 1.9 GHz INPUT IP3 (m) RETURN LOSS () Input IP3 vs. Control GHz INPUT IP3 (m) Input IP3 vs. Control 2.1 GHz INPUT IP3 (m) V (WORSE CASE) 1. V 1.8 V 2. V 3. V FREQUENCY (GHz) 2 Alpha Road, Chelmsford, MA 1824 Phone: One Technology Way, Fax: P.O Box 916, Norwood, MA Phone: Order online at Application Support: Phone: 1-8-ANALOG-D - 7

3 Relative Attenuation vs. Control GHz v1.1 ATTENUATOR, GHz Return Loss vs. Control GHz ATTENUATION () Relative Attenuation vs. Control GHz ATTENUATION () Relative Attenuation vs. Control 1.9 GHz ATTENUATION () C RETURN LOSS () Return Loss vs. Control GHz RETURN LOSS () Return Loss vs. Control 1.9 GHz RETURN LOSS () C Alpha Road, Chelmsford, MA 1824 Phone: One Technology Way, Fax: P.O Box 916, Norwood, MA Phone: Order online at Application Support: Phone: 1-8-ANALOG-D

4 Relative Attenuation vs. Control 2.1 GHz ATTENUATION () Relative Attenuation vs. Control Voltage ATTENUATION () V 1. V 1.6V 1.7 V v V 2. V 3. V FREQUENCY (GHz) Return Loss vs. Control 2.1 GHz RETURN LOSS () Worse Case Input P1 vs. Temperature INPUT P1 (m) ATTENUATOR, GHz FREQUENCY (GHz) 2 Alpha Road, Chelmsford, MA 1824 Phone: One Technology Way, Fax: P.O Box 916, Norwood, MA Phone: Order online at Application Support: Phone: 1-8-ANALOG-D - 9

5 Absolute Maximum Ratings v1.1 ATTENUATOR, GHz Control and Bias Voltage V CTL Vdd Maximum Input Power Vdd = +3.3 Vdc Outline Drawing -.2 Vdc to Vdd +8 Vdc +29 m +21 m Channel Temperature (Tc) C Thermal Resistance (R TH ) (junction to lead) 92 C/W Storage Temperature -6 to + C Operating Temperature -4 to +8 C ESD Sensitivity (HBM) Class 1A Min. Atten. Attenuation >2 V CTL Vdd to +3 1 μa +3.3 Vdc ±.1 1 μa ELECTROSTATIC SENSITIVE DEVICE OBSERVE HANDLING PRECAUTIONS NOTES: 1. LEADFRAME MATERIAL: COPPER ALLOY 2. DIMENSIONS ARE IN INCHES [MILLIMETERS]. 3. DIMENSION DOES NOT INCLUDE MOLDFLASH OF.mm PER SIDE. 4. DIMENSION DOES NOT INCLUDE MOLDFLASH OF.2mm PER SIDE.. ALL GROUND LEADS MUST BE SOLDERED TO PCB RF GROUND. Package Information Part Number Package Body Material Lead Finish MSL Rating Package Marking [3] [1] H473 HMC473MS8 Low Stress Injection Molded Plastic Sn/Pb Solder MSL1 XXXX [2] H473 HMC473MS8E RoHS-compliant Low Stress Injection Molded Plastic 1% matte Sn MSL1 XXXX [1] Max peak refl ow temperature of 23 C [2] Max peak refl ow temperature of 26 C [3] 4-Digit lot number XXXX Alpha Road, Chelmsford, MA 1824 Phone: One Technology Way, Fax: P.O Box 916, Norwood, MA Phone: Order online at Application Support: Phone: 1-8-ANALOG-D

6 Pin Descriptions Pin Number Function Description Interface Schematic 1, 8 RF1, RF2 These pins are DC coupled and matched to Ohms. DC blocking capacitors are required. 33pF capacitors are supplied on evaluation board. 2, 7 GND Pins must connect to RF ground. 3 Vctl Control voltage 4, N/C v1.1 No Connection. These pins may be connected to RF ground. Performance will not be affected. 6 Vdd Supply Voltage. ATTENUATOR, GHz 2 Alpha Road, Chelmsford, MA 1824 Phone: One Technology Way, Fax: P.O Box 916, Norwood, MA Phone: Order online at Application Support: Phone: 1-8-ANALOG-D - 161

7 Attenuation Linearizing Control Circuit For The HMC473MS8 / HMC473MS8E Voltage Variable Attenuator A driver circuit to improve the attenuation linearity of the HMC473MS8 & HMC473MS8E can be implemented with a simple op-amp confi guration. A breakpoint linearization circuit will scale the voltage supplied to the control line of the HMC473MS8 & HMC473MS8E, so that a more linear attenuation vs. control voltage slope can be achieved. A -3.3V and +3.3V supply is required. Diode and resistor values which defi ne the op-amp gain, and breakpoint were selected to optimize a measured production lot of attenuators at.9 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.V, 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.9 GHz attenuation applications. A similar approach may be used at other frequencies by adjusting R1 - R9 resistor values. Application Circuit Required Parts List v1.1 Part Description Manufacturer AD822 Op-Amp Analog Devices R1 1K ohms Panasonic R2 2K ohms Panasonic R3 7.K ohms Panasonic R4 39K ohms Panasonic R 22K ohms Panasonic R6 91K ohms Panasonic R7 91 ohms Panasonic R8 1 ohms Panasonic R9 1 ohms Panasonic D1, D2 LL4148 D-3 Digi-Key ATTENUATOR, GHz Alpha Road, Chelmsford, MA 1824 Phone: One Technology Way, Fax: P.O Box 916, Norwood, MA Phone: Order online at Application Support: Phone: 1-8-ANALOG-D

8 Evaluation PCB v1.1 ATTENUATOR, GHz List of Materials for Evaluation PCB [1] Item J1 - J2 J3 - J Description PCB Mount SMA RF Connector DC PIN C1, C2 33pF capacitor, 42 Pkg. C3, C4 1KpF capacitor, 63 Pkg. U1 PCB [2] HMC473MS8 / HMC473MS8E 1182 Eval Board [1] Reference this number when ordering complete evaluation PCB [2] Circuit Board Material: Rogers 43 The circuit board used in the fi nal application should be generated with proper RF circuit design techniques. Signal lines at the RF ports should be ohm impedance and the package ground leads 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. 2 Alpha Road, Chelmsford, MA 1824 Phone: One Technology Way, Fax: P.O Box 916, Norwood, MA Phone: Order online at Application Support: Phone: 1-8-ANALOG-D - 163