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| v01.0402 MICROWAVE CORPORATION HMC291 4 dB LSB GaAs MMIC 2-BIT DIGITAL ATTENUATOR, 0.7 - 4.0 GHz Features 4 dB LSB Steps to 12 dB Single Positive Control Per BIT, 0/+3V +/-0.2 dB Typical Bit Error Miniature SOT 26 Package: 9 mm2 Typical Applications The HMC291 is ideal for: 9 ATTENUATORS - SMT * Cellular * PCS, ISM, MMDS * WLL Handset & Base Station Functional Diagram General Description The HMC291 is a broadband 2 - bit positive control GaAs IC digital attenuator in a 6 lead SOT26 surface mount plastic package. Covering 0.7 to 4 GHz, the insertion loss is typically less than 0.7 to 1.3 dB. The attenuator bit values are 4 (LSB) and 8 dB for a total attenuation of 12 dB. Accuracy is excellent at 0.2 dB typical with an IIP3 of up to +54 dBm. Two bit control voltage inputs, toggled between 0 and +3 to +5 volts, are used to select each attenuation state at less than 50 uA each. A single Vdd bias of +3 to +5 volts applied through an external 5K Ohm resistor is required. Electrical Specifications, TA = +25 C, Vdd = +3V to +5V & Vctl = 0/Vdd (Unless Otherwise Stated) Parameter Insertion Loss Frequency 0.7 - 1.4 GHz 1.4 - 2.3 GHz 2.3 - 2.7 GHz 2.7 - 4.0 GHz 0.7 - 4.0 GHz 0.7 - 1.4 GHz 1.4 - 4.0 GHz 14 16 Min. Typical 0.7 0.9 1.0 1.1 12 17 22 Max. 1.0 1.3 1.4 1.6 Units dB dB dB dB dB dB dB Attenuation Range Return Loss (RF1 & RF2, All Atten. States) Attenuation Accuracy: (Referenced to Insertion Loss) All Attenuation States All Attenuation States All Attenuation States All Attenuation States Input Power for 0.1 dB Compression 5V 3V 5V 3V 0.7 - 1.4 GHz 1.4 - 2.3 GHz 2.3 - 2.7 GHz 2.7 - 4.0 GHz 0.7 - 4.0 GHz 0.3 + 3% of Atten. Setting Max 0.2 + 2% of Atten. Setting Max 0.2 + 3% of Atten. Setting Max 0.4 + 5% of Atten. Setting Max 26 22 54 50 dB dB dB dB dBm dBm dBm dBm Input Third Order Intercept Point (Two-tone Input Power = 0 dBm Each Tone) Switching Characteristics tRISE, tFALL (10/90% RF) tON, tOFF (50% CTL to 10/90% RF) 0.7 - 4.0 GHz 0.7 - 4.0 GHz 560 600 ns ns 9 - 38 For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order Online at www.hittite.com v01.0402 MICROWAVE CORPORATION HMC291 4 dB LSB GaAs MMIC 2-BIT DIGITAL ATTENUATOR, 0.7 - 4.0 GHz Insertion Loss 0 -40 C +25 C Return Loss RF1, RF2 0 -5 RETURN LOSS (dB) -10 12 dB INSERTION LOSS (dB) -0.5 9 8 dB 4 dB -1 -15 -1.5 +85 C -25 -30 -2 -2.5 0.5 1 1.5 2 2.5 3 3.5 4 -35 0.5 1 1.5 2 2.5 3 3.5 4 FREQUENCY (GHz) FREQUENCY (GHz) Normalized Attenuation 0 NORMALIZED ATTENUATION (dB) 4 dB Absolute Bit Error vs. Attenuation State 1 -2 0.8 8 dB BIT ERROR (dB) -4 -6 -8 12 dB 3.5 GHz 0.6 2.4 GHz 0.9 GHz 0.4 -10 0.2 -12 -14 0.5 0 1 1.5 2 2.5 3 3.5 4 4 6 8 ATTENUATION STATE (dB) 10 1.9 GHz 12 FREQUENCY (GHz) Absolute Bit Error vs. Frequency 2 Relative Phase vs. Frequency 60 50 1.5 BIT ERROR (dB) RELATIVE PHASE (deg.) 40 30 20 10 0 -10 4 dB 12 dB 8 dB 8 dB 1 12 dB 4 dB 0.5 0 0.5 1 1.5 2 2.5 3 3.5 4 -20 0.5 1 1.5 2 2.5 3 3.5 4 FREQUENCY (GHz) FREQUENCY (GHz) Note: All Data Typical Over Voltage (+3V to +5V) & Temperature (-40 to +85 deg. C.). For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order Online at www.hittite.com 9 - 39 ATTENUATORS - SMT -20 v01.0402 MICROWAVE CORPORATION HMC291 4 dB LSB GaAs MMIC 2-BIT DIGITAL ATTENUATOR, 0.7 - 4.0 GHz Truth Table Control Voltage Input Control & Bias Voltages V2 4 dB High Low High Low Attenuation Setting RF1 - RF2 Reference I.L. Note: Vdd = +3V to 5V 0.2V 4 dB 8 dB 12 dB Max. Atten. State Low High Bias Condition 0 to +0.2V @ 20 uA Max. Vdd 0.2V @ 50 uA Max. 9 ATTENUATORS - SMT V1 8 dB High High Low Low Any combination of the above states will provide an attenuation approximately equal to the sum of the bits selected. Application Circuit DC blocking capacitors C1 & C2 are required on RF1 & RF2. Choose C1 = C2 = 100 ~ 300 pF to allow lowest customer specific frequency to pass with minimal loss. R1 = 5K Ohm is required to supply voltage to the circuit throught either PIN 3 or PIN 1. 9 - 40 For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order Online at www.hittite.com v01.0402 MICROWAVE CORPORATION HMC291 4 dB LSB GaAs MMIC 2-BIT DIGITAL ATTENUATOR, 0.7 - 4.0 GHz Absolute Maximum Ratings Control Voltage (V1, V2) Bias Voltage (Vdd) Storage Temperature Operating Temperature RF Input Power (0.7 - 4 GHz) Vdd + 0.5 Vdc +8.0 Vdc -65 to +150 C -40 to +85 C 9 ATTENUATORS - SMT NOTES: 1. PACKAGE BODY MATERIAL: LOW STRESS INJECTION MOLDED PLASTIC SILICA AND SILICON IMPREGNATED. 2. LEADFRAME MATERIAL: COPPER ALLOY 3. LEADFRAME PLATING: Sn/Pb SOLDER 4. DIMENSIONS ARE IN INCHES [MILLIMETERS]. 5. DIMENSION DOES NOT INCLUDE MOLDFLASH OF 0.15mm PER SIDE. 6. DIMENSION DOES NOT INCLUDE MOLDFLASH OF 0.25mm PER SIDE. 7. ALL GROUND LEADS MUST BE SOLDERED TO PCB RF GROUND. +28 dBm Outline Drawing For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order Online at www.hittite.com 9 - 41 v01.0402 MICROWAVE CORPORATION HMC291 4 dB LSB GaAs MMIC 2-BIT DIGITAL ATTENUATOR, 0.7 - 4.0 GHz Evaluation Circuit Board 9 ATTENUATORS - SMT * R2 = R3 = 100 Ohm. These resistors are optional and may be used to enhance decoupling of the RF path from the control inputs. 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. 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. List of Material Item J1 - J2 J3 - J6 R1 R2, R3 C1, C2 U1 PCB* Description PC Mount SMA Connector DC Pin 5k Ohm Resistor, 0402 Chip 100 Ohm Resistor, 0402 Chip 0402 Chip Capacitor, Select for Lowest Frequency of Operation HMC291 Digital Attenuator 103370 Evaluation PCB 1.5" x 1.5" *Circuit Board Material Rogers 4350 9 - 42 For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order Online at www.hittite.com v01.0402 MICROWAVE CORPORATION HMC291 4 dB LSB GaAs MMIC 2-BIT DIGITAL ATTENUATOR, 0.7 - 4.0 GHz Notes: 9 ATTENUATORS - SMT For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order Online at www.hittite.com 9 - 43 |
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