Features. = +25 C, Vdd = +3V to +5V & Vctl = 0/Vdd (Unless Otherwise Stated)

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1 Typical Applications Functional Diagram v1.7 The HMC288MS8 / HMC288MS8E is ideal for: Cellular PCS, ISM, MMDS WLL applications HMC288MS8 / 288MS8E 2 LSB GaAs MMIC 3-BIT DIGITAL ATTENUATOR, GHz Features 2 LSB Steps to 14 Single Positive Control Per BIT Monotonic: ±3 Bit Error Typical Miniature MSOP-8 Package, 14.8mm 2 General Description The HMC288MS8 & HMC288MS8E are broadband 3-bit positive control GaAs IC digital attenuators in 8 lead MSOP surface mount plastic packages. Covering.7 to 3.7 GHz, the insertion loss is typically less than 1.2 to 1.8. The attenuator bit values are 2 (LSB), 4, and 8 for a total attenuation of 14. Accuracy is excellent at ±.3 typical with an IIP3 of up to +1 m. Three bit control voltage inputs, toggled between and +3 to +V, are used to select each attenuation state at less than ua each. A single Vdd bias of +3 to +V applied through an external K Ohm resistor is required while occupying less than 14.8 mm2. Electrical Specifications, T A = +2 C, Vdd = +3V to +V & Vctl = /Vdd (Unless Otherwise Stated) Insertion Loss Parameter Frequency Min. Typical Max. Units GHz GHz GHz GHz Attenuation Range GHz 14 Return Loss (RF1 & RF2, All Atten. States) Attenuation Accuracy: (Referenced to Insertion Loss) GHz GHz GHz GHz GHz GHz GHz GHz ±.3 + 3% of Atten. Setting Max ±.2 + 3% of Atten. Setting Max ±.3 + 3% of Atten. Setting Max ±.3 + 4% of Atten. Setting Max Input Power for.1 Compression V 3V GHz 2 22 m m Input Third Order Intercept Point (Two-tone Input Power = m Each Tone) V 3V GHz 1 47 m m Switching Characteristics trise, tfall (1/9% RF) ton, toff (% CTL to 1/9% RF) GHz 6 6 ns ns Alpha Road, Chelmsford, MA 1824 Phone: Fax:

2 Insertion Loss v1.7 2 LSB GaAs MMIC 3-BIT DIGITAL ATTENUATOR, GHz Return Loss RF1, RF2 INSERTION LOSS () C -4 C +8 C Normalized Attenuation RETURN LOSS () Absolute Bit Error vs. Attenuation State NORMALIZED ATTENUATION () BIT ERROR () GHz 1.9 GHz 2.4 GHz 3. GHz ATTENUATION STATE () Absolute Bit Error vs. Frequency 1. Relative Phase vs. Frequency 6 BIT ERROR () RELATIVE PHASE (deg.) Note: All Data Typical Over Voltage (+3V to +V) & Temperature (-4 to +8 deg. C.). 2 Alpha Road, Chelmsford, MA 1824 Phone: Fax:

3 Truth Table v1.7 2 LSB GaAs MMIC 3-BIT DIGITAL ATTENUATOR, GHz Control & Bias Voltages V1 8 Control Voltage Input V2 4 V3 2 High High High Application Circuit Attenuation Setting RF1 - RF2 Reference I.L. High High Low 2 High Low High 4 Low High High 8 Low Low Low 14 Max. Atten. Any combination of the above states will provide an attenuation approximately equal to the sum of the bits selected. State Bias Condition Low to 2 ua Max. High Vdd ua Max Note: Vdd = +3V to V ±.2V DC blocking capacitors C1 & C2 are required on RF1 & RF2. Choose C1 = C2 = 1 ~ 3 pf to allow lowest customer specifi c frequency to pass with minimal loss. R1 = K Ohm is required to supply voltage to the circuit throught either PIN or PIN Alpha Road, Chelmsford, MA 1824 Phone: Fax:

4 Absolute Maximum Ratings Control Voltage (V1, V2, V3) Bias Voltage (Vdd) Outline Drawing Vdd +. Vdc +8. Vdc Storage Temperature -6 to +1 C Operating Temperature -4 to +8 C RF Input Power (.7-4 GHz) +28 m v1.7 ELECTROSTATIC SENSITIVE DEVICE OBSERVE HANDLING PRECAUTIONS HMC288MS8 / 288MS8E 2 LSB GaAs MMIC 3-BIT DIGITAL ATTENUATOR, GHz NOTES: 1. LEADFRAME MATERIAL: COPPER ALLOY 2. DIMENSIONS ARE IN INCHES [MILLIMETERS] 3. DIMENSION DOES NOT INCLUDE MOLDFLASH OF.1mm 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] H288 HMC288MS8 Low Stress Injection Molded Plastic Sn/Pb Solder MSL1 XXXX [2] H288 HMC288MS8E 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 2 Alpha Road, Chelmsford, MA 1824 Phone: Fax:

5 Evaluation Circuit Board v1.7 2 LSB GaAs MMIC 3-BIT DIGITAL ATTENUATOR, GHz * R2 = R3 = R4 = 1 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 [1] Item Description J1 - J2 PCB Mount SMA Connector J3 - J6 DC Pin R1 k Ohm Resistor, 42 Chip R2, R3, R4 1 Ohm Resistor, 42 Chip C1, C2 42 Chip Capacitor, Select for Lowest Frequency of Operation U1 HMC288MS8 / HMC288MS8E Digital Attenuator PCB [2] Evaluation PCB 1. x 1. [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 use RF circuit design techniques. Signal lines should have 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 Alpha Road, Chelmsford, MA 1824 Phone: Fax:

6 Notes: v1.7 2 LSB GaAs MMIC 3-BIT DIGITAL ATTENUATOR, GHz 2 Alpha Road, Chelmsford, MA 1824 Phone: Fax: