= +25 C, With Vee = -5V & VCTL= 0/-5V

Transcription

1 v.3.5db LSB GaAs MMIC 6-BIT DIGITAL Typical Applications Features The is ideal for: Basestation Infrastructure Fiber Optics & Broadband Telecom Microwave & VSAT Radios Military & Space Test Instrumentation Functional Diagram.5 db LSB Steps to Single Control Line Per Bit ±.5 db Typical Bit Error 9mm Leadless SMT Plastic Package General Description The is a broadband 6-bit GaAs IC digital attenuator in low cost leadless surface mount package. Covering DC to 3 GHz, the insertion loss is less then typical. The attenuator bit values are.5 (LSB),,, 4, 8, and for a total attenuation of. Attenuation accuracy is excellent at ±.5 db typical step error with an IIP3 of +3m. Six control voltage inputs, toggled between and -5V, are used to select each attenuation state. A s i n g l e Ve e b i a s o f - 5 V a l l o w s o p e r a t i o n a t frequencies down to DC. Electrical Specifications, T A = +5 C, With Vee = -5V & VCTL= /-5V Insertion Loss Parameter Frequency (GHz) Min. Typ. Max. Units DC - 4 GHz GHz GHz Attenuation Range DC - 3. GHz Return Loss (RF & RF, All Atten. States) DC - 3. GHz 3 db Attenuation Accuracy: (Referenced to Insertion Loss) States DC - 3. GHz ± (.3 + 5% of Atten. Setting) Max db Input Power for. Compression Ghz 3 dbm Input Third Order Intercept Point (Two-Tone Input Power= +m Each Tone) Switching Characteristics REF State All Other States Ghz DC - 3. GHz 45 4 db db db dbm dbm trise, tfall (/9% RF) ton/toff (5% CTL to /9% RF) 3 5 ns ns For price, delivery and to place orders: Hittite Microwave Corporation, For price, delivery, Elizabeth and to Drive, place Chelmsford, orders: Analog MA Devices, 84 Inc., One Technology Way, P.O. Box 96, Norwood, MA 6-96 Phone: Fax: Phone: Order On-line at Application Support: Phone: Application or apps@hittite.com Support: Phone: -8-ANALOG-D

2 v.3.5db LSB GaAs MMIC 6-BIT DIGITAL Insertion Loss Normalized Attenuation INSERTION LOSS (db) C +85 C -4 C Input Return Loss RETURN LOSS (db) NORMALIZED ATTENUATION (db) db Output Return Loss RETURN LOSS (db) IL.5 db IL.5 db Bit Error vs. Frequency Bit Error vs. Attenuation State BIT ERROR (db) - BIT ERROR (db) ATTENUATION STATE (db).5 db. GHz 4 GHz 8 GHz 3 GHz For price, delivery and to place orders: Hittite Microwave Corporation, For price, delivery, Elizabeth and to Drive, place Chelmsford, orders: Analog MA Devices, 84 Inc., One Technology Way, P.O. Box 96, Norwood, MA 6-96 Phone: Fax: Phone: Order On-line at Application Support: Phone: Application or apps@hittite.com Support: Phone: -8-ANALOG-D

3 v.3.5db LSB GaAs MMIC 6-BIT DIGITAL Relative Phase vs. Frequency Worst Case Step Error Between Successive Attenuation States RELATIVE PHASE (deg) Truth Table V V Control Voltage Input V3.5 db V4 V5 V6.5 db Low Low Low Low Low Low Attenuation State RF - RF Reference I.L. Low Low Low Low Low High.5 db Low Low Low Low High Low Low Low Low High Low Low Low Low High Low Low Low Low High Low Low Low Low High Low Low Low Low Low High High High High High High Any Combination of the above states will provide an attenuation approximately equal to the sum of the bits selected. STEP ERROR (db) Bias Voltage & Current Vee (VDC) Control Voltage State Low High Vee Range= -5 Vdc ± % Iee (Typ.) (ma) Bias Condition to 35 µa Typ. Iee (Max.) (ma) -5 5 Vee to Vee < µa Typ. 3 For price, delivery and to place orders: Hittite Microwave Corporation, For price, delivery, Elizabeth and to Drive, place Chelmsford, orders: Analog MA Devices, 84 Inc., One Technology Way, P.O. Box 96, Norwood, MA 6-96 Phone: Fax: Phone: Order On-line at Application Support: Phone: Application or apps@hittite.com Support: Phone: -8-ANALOG-D

4 v.3.5db LSB GaAs MMIC 6-BIT DIGITAL Absolute Maximum Ratings Control Voltage (V to V6) Vee -.5 Vdc Bias Voltage (Vee) -7 Vdc Channel Temperature 5 C Thermal Resistance 33 C/W Storage Temperature -65 to + 5 C Operating Temperature -55 to +85 C RF Input Power (.5-3 GHz) +5 dbm ESD Sensitivity (HBM) Class A Outline Drawing ELECTROSTATIC SENSITIVE DEVICE OBSERVE HANDLING PRECAUTIONS NOTES:. LEADFRAME MATERIAL: COPPER ALLOY. DIMENSIONS ARE IN INCHES [MILLIMETERS] 3. LEAD SPACING TOLERANCE IS NON-CUMULATIVE 4. PAD BURR LENGTH SHALL BE.5mm MAXIMUM. PAD BURR HEIGHT SHALL BE.5mm MAXIMUM. 5. PACKAGE WARP SHALL NOT EXCEED.5mm. 6. ALL GROUND LEADS AND GROUND PADDLE MUST BE SOLDERED TO PCB RF GROUND. 7. REFER TO HITTITE APPLICATION NOTE FOR SUGGESTED LAND PATTERN. Package Information Part Number Package Body Material Lead Finish MSL Rating Package Marking [] [] 44A RoHS-compliant Low Stress Injection Molded Plastic % matte Sn MSL XXXX [] Max peak reflow temperature of 6 C [] 4-Digit lot number XXXX For price, delivery and to place orders: Hittite Microwave Corporation, For price, delivery, Elizabeth and to Drive, place Chelmsford, orders: Analog MA Devices, 84 Inc., One Technology Way, P.O. Box 96, Norwood, MA 6-96 Phone: Fax: Phone: Order On-line at Application Support: Phone: Application or apps@hittite.com Support: Phone: -8-ANALOG-D 4

5 v.3.5db LSB GaAs MMIC 6-BIT DIGITAL Pin Description Pad Number Function Description Interface Schematic, 3,, GND, RFIN, RFOUT Package bottom has an exposed metal paddle that must also be connected to RF ground This pin is DC coupled and matched to 5 Ohm. Blocking capacitors are required if RF line potential is not equal to V. 4, 5, 6, 7, 8, 9 V6 - V See truth table and control voltage table. 3, 4, 6 N/C This pin should be connected to PCB RF ground to maximize performance 5 VEE Supply Voltage -5V ± % Suggested Driver Circuit (One Circuit Required Per Bit Control Input) Simple driver using inexpensive standard logic ICs provides fast switching using minimum DC current. * Recommended value to suppress unwanted RF signals at V - V6 control lines. 5 For price, delivery and to place orders: Hittite Microwave Corporation, For price, delivery, Elizabeth and to Drive, place Chelmsford, orders: Analog MA Devices, 84 Inc., One Technology Way, P.O. Box 96, Norwood, MA 6-96 Phone: Fax: Phone: Order On-line at Application Support: Phone: Application or apps@hittite.com Support: Phone: -8-ANALOG-D

6 v.3.5db LSB GaAs MMIC 6-BIT DIGITAL Evaluation PCB * R - R6 = Ohm. These resistors are optional and may be used to enhance decoupling of the RF path from the control inputs. List of Materials for Evaluation PCB EVHMC44ALP3 [] Item J - J J3 C Description PCB Mount SMA Connector 8 Pin DC Connector. µf Capacitor, 63 Pkg. R - R6 Ohm Resistor, 63 Pkg. U Digital Attenuator PCB [] 545 Evaluation PCB [] Reference this number when ordering complete evaluation PCB [] Circuit Board Material: Rogers 435 The circuit board used in the application should use RF circuit design techniques. Signal lines should have 5 Ohm impedance while the package ground leads and exposed paddle 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 shown is available from Hittite upon request. For price, delivery and to place orders: Hittite Microwave Corporation, For price, delivery, Elizabeth and to Drive, place Chelmsford, orders: Analog MA Devices, 84 Inc., One Technology Way, P.O. Box 96, Norwood, MA 6-96 Phone: Fax: Phone: Order On-line at Application Support: Phone: Application or apps@hittite.com Support: Phone: -8-ANALOG-D 6