HMC291 / 291E v02.0402 4 dB LSB GaAs MMIC 2-BIT DIGITAL ATTENUATOR, 0.7 - 4.0 GHz ATTENUATORS - SMT 5 Typical Applications Features The HMC291 & HMC291E are ideal for: RoHS Compliant Product • Cellular 4 dB LSB Steps to 12 dB • PCS, ISM, MMDS Single Positive Control Per BIT, 0/+3V • WLL Handset & Base Station ±0.2 dB Typical Bit Error Miniature SOT 26 Package: 9 mm2 Included in the HMC-DK004 Designer’s Kit Functional Diagram General Description The HMC291 & HMC291E are general purpose broadband 2-bit positive control GaAs IC digital attenuators in 6 lead SOT26 surface mount plastic packages. 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 Specifi cations, TA = +25° C, Vdd = +3V to +5V & Vctl = 0/Vdd (Unless Otherwise Stated) Parameter Frequency Min. Typical Max. Units 1.0 1.3 1.4 1.6 dB dB dB dB Insertion Loss 0.7 - 1.4 GHz 1.4 - 2.3 GHz 2.3 - 2.7 GHz 2.7 - 4.0 GHz 0.7 0.9 1.0 1.1 Attenuation Range 0.7 - 4.0 GHz 12 dB Return Loss (RF1 & RF2, All Atten. States) 0.7 - 1.4 GHz 1.4 - 4.0 GHz 17 22 dB dB 0.7 - 1.4 GHz 1.4 - 2.3 GHz 2.3 - 2.7 GHz 2.7 - 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 dB dB dB dB 14 16 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 0.7 - 4.0 GHz 26 22 dBm dBm Input Third Order Intercept Point (Two-tone Input Power = 0 dBm Each Tone) 5V 3V 0.7 - 4.0 GHz 54 50 dBm dBm 560 600 ns ns Switching Characteristics tRISE, tFALL (10/90% RF) tON, tOFF (50% CTL to 10/90% RF) 5 - 46 0.7 - 4.0 GHz For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com HMC291 / 291E v02.0402 4 dB LSB GaAs MMIC 2-BIT DIGITAL ATTENUATOR, 0.7 - 4.0 GHz Insertion Loss 5 Return Loss RF1, RF2 0 RETURN LOSS (dB) INSERTION LOSS (dB) -5 -0.5 -1 -1.5 +25 C -40 C +85 C -2 -2.5 0.5 1 1.5 2 2.5 -10 4 dB 8 dB 12 dB -15 -20 -25 -30 3 3.5 -35 0.5 4 1 1.5 FREQUENCY (GHz) Normalized Attenuation 2.5 3 3.5 4 Absolute Bit Error vs. Attenuation State 1 0 4 dB 8 dB 12 dB -2 0.9 GHz 1.9 GHz 2.4 GHz 3.5 GHz 0.8 -4 BIT ERROR (dB) NORMALIZED ATTENUATION (dB) 2 FREQUENCY (GHz) ATTENUATORS - SMT 0 -6 -8 0.6 0.4 -10 0.2 -12 -14 0.5 0 1 1.5 2 2.5 3 3.5 4 4 6 8 10 12 ATTENUATION STATE (dB) FREQUENCY (GHz) Absolute Bit Error vs. Frequency Relative Phase vs. Frequency 2 60 BIT ERROR (dB) RELATIVE PHASE (deg.) 50 4 dB 8 dB 12 dB 1.5 1 0.5 4 dB 8 dB 12 dB 40 30 20 10 0 -10 0 0.5 1 1.5 2 2.5 FREQUENCY (GHz) 3 3.5 4 -20 0.5 1 1.5 2 2.5 3 3.5 4 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: 20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com 5 - 47 HMC291 / 291E v02.0402 ATTENUATORS - SMT 5 Truth Table Control & Bias Voltages Control Voltage Input V1 8 dB V2 4 dB Attenuation Setting RF1 - RF2 High High Reference I.L. High Low 4 dB Low High 8 dB Low 12 dB Max. Atten. Low 4 dB LSB GaAs MMIC 2-BIT DIGITAL ATTENUATOR, 0.7 - 4.0 GHz State Bias Condition Low 0 to +0.2V @ 20 uA Max. High Vdd ± 0.2V @ 50 uA Max. Note: Vdd = +3V to 5V ± 0.2V 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. 5 - 48 For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com HMC291 / 291E v02.0402 4 dB LSB GaAs MMIC 2-BIT DIGITAL ATTENUATOR, 0.7 - 4.0 GHz 5 Control Voltage (V1, V2) Vdd + 0.5 Vdc Bias Voltage (Vdd) +8.0 Vdc Storage Temperature -65 to +150 °C Operating Temperature -40 to +85 °C RF Input Power (0.7 - 4 GHz) +28 dBm ESD Sensitivity (HBM) Class 1A ATTENUATORS - SMT Absolute Maximum Ratings ELECTROSTATIC SENSITIVE DEVICE OBSERVE HANDLING PRECAUTIONS Outline Drawing NOTES: 1. LEADFRAME MATERIAL: COPPER ALLOY 2. DIMENSIONS ARE IN INCHES [MILLIMETERS]. 3. DIMENSION DOES NOT INCLUDE MOLDFLASH OF 0.15mm PER SIDE. 4. DIMENSION DOES NOT INCLUDE MOLDFLASH OF 0.25mm PER SIDE. 5. ALL GROUND LEADS MUST BE SOLDERED TO PCB RF GROUND. Package Information Part Number Package Body Material Lead Finish MSL Rating HMC291 Low Stress Injection Molded Plastic Sn/Pb Solder MSL1 HMC291E RoHS-compliant Low Stress Injection Molded Plastic 100% matte Sn MSL1 Package Marking [1] H291 XXXX [2] 291E XXXX [1] Max peak reflow temperature of 235 °C [2] Max peak reflow temperature of 260 °C For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com 5 - 49 HMC291 / 291E v02.0402 Evaluation Circuit Board ATTENUATORS - SMT 5 4 dB LSB GaAs MMIC 2-BIT DIGITAL ATTENUATOR, 0.7 - 4.0 GHz * R2 = R3 = 100 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 103372 [1] Item Description J1 - J2 PCB Mount SMA Connector J3 - J6 DC Pin R1 5k Ohm Resistor, 0402 Chip R2, R3 100 Ohm Resistor, 0402 Chip C1, C2 0402 Chip Capacitor, Select for Lowest Frequency of Operation U1 HMC291 / HMC291E Digital Attenuator PCB [2] 103370 Evaluation PCB 1.5” x 1.5” 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. [1] Reference this number when ordering complete evaluation PCB [2] Circuit Board Material: Rogers 4350 5 - 50 For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com HMC291 / 291E v02.0402 4 dB LSB GaAs MMIC 2-BIT DIGITAL ATTENUATOR, 0.7 - 4.0 GHz 5 ATTENUATORS - SMT Notes: For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com 5 - 51