HMC271LP4 / 271LP4E v02.0705 1 dB LSB GaAs MMIC 5-BIT SERIAL CONTROL DIGITAL ATTENUATOR, 0.7 - 3.7 GHz ATTENUATORS - SMT 9 Typical Applications Features The HMC271LP4 / HMC271LP4E is ideal for: 1 dB LSB Steps to 31 dB • Cellular/3G Infrastructure CMOS Compatible Serial Data Interface • Fixed Wireless & WiMax SPI Compatible Serial Output • Test Instrumentation +/- 0.4 dB Typical Bit Error 4 x 4 mm QFN Plastic Package Functional Diagram General Description The HMC271LP4 & HMC271LP4E are broadband 5bit positive control GaAs IC digital attenuators with serial-to-parallel drivers in low cost leadless QFN 4x4 mm SMT packages. Covering 0.7 to 3.7 GHz, the insertion loss is typically less than 2.5 dB. The attenuator bit values are 1 (LSB), 2, 4, 8, and 16 dB for a total attenuation of 31 dB. Accuracy is excellent at ± 0.4 dB typical with an IIP3 of up to +48 dBm. Five bit CMOS compatible serial control words are used to select each attenuation state. A single Vcc bias of +3V to +5V applied through an external 5k Ohm resistor is required. Electrical Specifications, TA = +25° C, Vcc = +3V to +5V Parameter Typical Max. Units Insertion Loss 0.7 - 1.4 GHz 1.4 - 2.3 GHz 2.3 - 2.7 GHz 2.7 - 3.7 GHz Frequency 1.9 2.3 2.6 2.8 2.4 2.8 3.1 3.3 dB dB dB dB Attenuation Range 0.7 - 3.7 GHz 31 dB Return Loss (RF1 & RF2, All Atten. States) 0.7 - 1.4 GHz 1.4 - 2.7 GHz 2.7 - 3.7 GHz 12 15 16 dB dB dB 0.7 - 3.7 GHz ± 0.4 ± 5% of Atten. Setting Max dB Attenuation Accuracy: (Referenced to Insertion Loss) All Attenuation States Min. Input Power for 0.1 dB Compression Vcc = 5V Vcc = 3V 0.7 - 3.7 GHz 24 22 dBm dBm Input Third Order Intercept Point (Two-tone Input Power = 0 dBm Each Tone) Vcc = 5V Vcc = 3V 0.7 - 3.7 GHz 48 46 dBm dBm 0.7 - 3.7 GHz 750 830 ns ns Switching Characteristics tRISE, tFALL (10/90% RF) tON, tOFF (Latch Enable to 10/90% RF) 9 - 14 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 HMC271LP4 / 271LP4E v02.0705 1 dB LSB GaAs MMIC 5-BIT SERIAL CONTROL DIGITAL ATTENUATOR, 0.7 - 3.7 GHz Return Loss RF1, RF2 Insertion Loss (Only Major States are Shown) 0 +25C +85C -40C -1.5 -2 -2.5 16 dB 31 dB -20 2 dB -25 -3.5 1 dB I.L. -30 1 1.5 2 2.5 3 3.5 0.5 4 1 1.5 FREQUENCY (GHz) 2 2.5 3 3.5 4 FREQUENCY (GHz) Bit Error vs. Attenuation State Normalized Attenuation (Only Major States are Shown) 0 2 -5 1.5 0.9 GHz -10 BIT ERROR (dB) NORMALIZED ATTENUATION (dB) 8 dB -15 -3 -4 0.5 4 dB -10 -15 -20 1.9 GHz 2.4 GHz ATTENUATORS - SMT -1 -5 RETURN LOSS (dB) INSERTION LOSS (dB) 9 0 -0.5 1 0.5 0 -25 -0.5 -30 3.5 GHz -35 0.5 -1 1 1.5 2 2.5 3 3.5 4 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 FREQUENCY (GHz) ATTENUATION STATE (dB) Bit Error vs. Frequency Relative Phase vs. Frequency (Only Major States are Shown) (Only Major States are Shown) 4 100 RELATIVE PHASE (deg.) 75 BIT ERROR (dB) 3 16 dB 8 dB 1, 2, 4 dB 2 1 31 dB 0 50 31 dB 16 dB 25 0 -25 -50 1, 2, 4, 8 dB -75 -1 0.5 -100 1 1.5 2 2.5 FREQUENCY (GHz) 3 3.5 4 0 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 9 - 15 HMC271LP4 / 271LP4E v02.0705 1 dB LSB GaAs MMIC 5-BIT SERIAL CONTROL DIGITAL ATTENUATOR, 0.7 - 3.7 GHz Worst Case Step Error Between Successive Attenuation States 9 CMOS Control Voltages 1.2 1 STEP ERROR (dB) ATTENUATORS - SMT 0.8 0.6 State Vcc = +5V Low 0 to 1.3V Vcc = +3V 0 to 0.7V High 3.5 to 5.0V 2.3 to 3.0V 0.4 Serial Input Truth Table 0.2 0 -0.2 Latch Enable -0.4 -0.6 Shift Lock -1 1 1.5 2 2.5 3 3.5 Shift register cleared X L X Ç H Shift register locked H Contents of shift register transferrred to output latches Ç 4 Function X -0.8 -1.2 0.5 Reset X FREQUENCY (GHz) Timing Truth Table Symbol Vcc = +5V Vcc = +3V Serial Data Input Unit Parameter Min. Max. Min. Max. Serial IN Setup Time ts 20 - 100 - ns Hold time from Serial In to Shift Clock th 0 - 5 - ns Setup time from Shift clock to Latch Enable tlsup 40 - 100 - ns Propogation delay, Latch enable to Qa through Qh tpd - 30 - 70 ns Setup time from Reset to Shift Clock - 20 - 50 - ns Clock Frequency (1/tclk) fclk - 30 - 10 MHz C1 C2 C4 C8 C16 High High High High High Reference I.L. Low High High High High 1 dB High Low High High High 2 dB High High Low High High 4 dB High High High Low High 8 dB High High High High Low 16 dB Low Low Low Low Low 31 dB Max. Atten. Any combination of the above states will provide an attenuation approximately equal to the sum of the bits selected. Timing Diagram 9 - 16 Attenuation Setting RF1 - RF2 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 HMC271LP4 / 271LP4E v02.0705 1 dB LSB GaAs MMIC 5-BIT SERIAL CONTROL DIGITAL ATTENUATOR, 0.7 - 3.7 GHz Absolute Maximum Ratings -1.5 to (Vcc + 1.5) Vdc Digital Outputs (Serial Out) -0.5 to (Vcc+0.5)Vdc DC Current on Serial Output ±35mA Bias Voltage (Vcc) +7.0 Vdc Storage Temperature -65 to +150 °C Operating Temperature -40 to +85 °C RF Input Power (0.7 - 3.7 GHz) +26 dBm ESD Sensitivity (HBM) Class 1A ELECTROSTATIC SENSITIVE DEVICE OBSERVE HANDLING PRECAUTIONS 9 ATTENUATORS - SMT Digital Inputs (Reset, Shift Clock, Latch Enable & Serial In) Outline Drawing NOTES: 1. LEADFRAME MATERIAL: COPPER ALLOY 2. DIMENSIONS ARE IN INCHES [MILLIMETERS] 3. LEAD SPACING TOLERANCE IS NON-CUMULATIVE 4. PAD BURR LENGTH SHALL BE 0.15mm MAXIMUM. PAD BURR HEIGHT SHALL BE 0.05mm MAXIMUM. 5. PACKAGE WARP SHALL NOT EXCEED 0.05mm. 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 HMC271LP4 Low Stress Injection Molded Plastic Sn/Pb Solder MSL1 HMC271LP4E RoHS-compliant Low Stress Injection Molded Plastic 100% matte Sn MSL1 Package Marking [3] [1] H271 XXXX [2] H271 XXXX [1] Max peak reflow temperature of 235 °C [2] Max peak reflow temperature of 260 °C [3] 4-Digit lot number XXXX 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 9 - 17 HMC271LP4 / 271LP4E v02.0705 1 dB LSB GaAs MMIC 5-BIT SERIAL CONTROL DIGITAL ATTENUATOR, 0.7 - 3.7 GHz Pin Descriptions ATTENUATORS - SMT 9 9 - 18 Pin Number Function Description 1, 3, 4, 6, 10, 12, 13, 15, 16, 18 N/C These pins should be connected to PCB RF ground to maximize performance. 2, 17 RF1, RF2 This pin is DC coupled and matched to 50 Ohms Blocking capacitors are required. Select value based on lowest frequency of operation. 5 Serial Out Serial data output. Serial input data delayed by 8 clock cycles. 7 Reset 8 Shift clock 9 Latch Enable 11 Serial In 14 Vcc Supply Voltage. 19 - 24 GND Package bottom has an exposed metal paddle that must also be connected to RF/DC Ground. Interface Schematic See truth table, control voltage table and timing diagram. 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 HMC271LP4 / 271LP4E v02.0705 1 dB LSB GaAs MMIC 5-BIT SERIAL CONTROL DIGITAL ATTENUATOR, 0.7 - 3.7 GHz Application Circuit ATTENUATORS - SMT 9 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 through either PIN 2 or PIN 17. 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 9 - 19 HMC271LP4 / 271LP4E v02.0705 1 dB LSB GaAs MMIC 5-BIT SERIAL CONTROL DIGITAL ATTENUATOR, 0.7 - 3.7 GHz Logic / Functional Diagram ATTENUATORS - SMT 9 Programming Example to Select 1 dB State 9 - 20 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 HMC271LP4 / 271LP4E v02.0705 1 dB LSB GaAs MMIC 5-BIT SERIAL CONTROL DIGITAL ATTENUATOR, 0.7 - 3.7 GHz Evaluation Circuit Board ATTENUATORS - SMT 9 List of Materials for Evaluation PCB 108782 [1] Item Description J1 - J2 PCB Mount SMA Connector J3 2 mm Molex Header C1, C2 100 pF Capacitor, 0402 Pkg. C3 0.01 μF Capacitor, 0402 Pkg. R1 5k Ohm Resistor, 0402 Pkg. U1 HMC271LP4 / HMC271LP4E Digital Attenuator PCB [2] 108780 Evaluation PCB 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 and exposed ground paddle should be connected directly to the ground plane similar to that shown below. 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 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 9 - 21