HMC542LP4 / 542LP4E v00.0306 0.5 dB LSB GaAs MMIC 6-BIT DIGITAL SERIAL CONTROL ATTENUATOR, DC - 3.0 GHz ATTENUATORS - SMT 6 Typical Applications Features The HMC542LP4 / HMC542LP4E is ideal for both RF and IF applications: 0.5 dB LSB Steps to 31.5 dB • Cellular/PCS/3G Infrastructure SPI Compatible Serial Output • ISM, MMDS, WLAN, WiMAX, & WiBro +/- 0.25 dB Typical Step Error • Microwave Radio & VSAT Single +5V Supply • Test Equipment and Sensors 4x4 mm SMT Package Functional Diagram General Description TTL/CMOS Compatible Serial Data Interface The HMC542LP4 & HMC542LP4E are broadband 6-bit GaAs IC digital attenuators with CMOS compatible serial to parallel drivers in low cost leadless surface mount packages. This serial control digital attenuator incorporates off chip AC ground capacitors for near DC operation, making it suitable for a wide variety of RF and IF applications. Covering DC to 3.0 GHz, the insertion loss is less than 1.5 dB typical. The attenuator bit values are 0.5 (LSB), 1, 2, 4, 8, and 16 dB for a total attenuation of 31.5 dB. Attenuation accuracy is excellent at ± 0.25 dB typical step error with an IIP3 of +45 dBm. Six bit serial control words are used to select each attenuation state. A single Vdd bias of +5V is required. Electrical Specifications, TA = +25° C, With Vcc = +5V Parameter Frequency (GHz) Typ. Max. Units Insertion Loss DC - 1.5 GHz 1.5 - 3.0 GHz Min. 1.2 1.5 1.5 1.8 dB dB Attenuation Range DC - 3.0 GHz 31.5 dB Return Loss (RF1 & RF2, All Atten. States) DC - 3.0 GHz 17 dB Attenuation Accuracy: (Referenced to Insertion Loss) All Attenuation States 0.5 - 3.5 dB States 4.0 - 31.5 dB States All Attenuation States DC - 1.0 GHz 1.0 - 2.2 GHz 1.0 - 2.2 GHz 2.2 - 3.0 GHz ± (0.20 + 3% of Atten. Setting) Max. ± (0.25 + 3% of Atten. Setting) Max. ± (0.15 + 4% of Atten. Setting) Max. ± (0.30 + 3% of Atten. Setting) Max. dB dB dB dB Input Power for 0.1 dB Compression 0.1 - 3.0 GHz 20 dBm Input Third Order Intercept Point (Two-Tone Input Power= 0 dBm Each Tone) 0.1 - 1.5 GHz 1.5 - 3.0 GHz 35 45 dBm dBm 800 900 ns ns Switching Characteristics DC - 3.0 GHz tRISE, tFALL (10/90% RF) tON, tOFF (50% CTL to 10/90% RF) 6 - 182 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 HMC542LP4 / 542LP4E v00.0306 0.5 dB LSB GaAs MMIC 6-BIT DIGITAL SERIAL CONTROL ATTENUATOR, DC - 3.0 GHz Return Loss RF1, RF2 (Only Major States are Shown) 0 RETURN LOSS (dB) -0.5 INSERTION LOSS (dB) 6 0 -5 -1 -1.5 -2 +25 C +85 C -40 C -2.5 -10 0.5-16 dB -15 -20 -25 -30 31.5 dB -35 -3 -40 0 0.5 1 1.5 2 2.5 3 3.5 4 0 0.5 1 1.5 2 2.5 3 3.5 4 FREQUENCY (GHz) FREQUENCY (GHz) Normalized Attenuation (Only Major States are Shown) Bit Error vs. Attenuation State 1 0.8 -5 0.6 -10 BIT ERROR (dB) NORMALIZED ATTENUATION (dB) 0 -15 -20 -25 0.4 500 MHz 3 GHz 40 MHz 1 GHz 0.2 0 -0.2 -0.4 -0.6 -30 -0.8 -35 100 MHz 2 GHz -1 0 0.5 1 1.5 2 2.5 3 3.5 4 0 4 8 FREQUENCY (GHz) 12 16 20 24 28 32 ATTENUATION STATE (dB) Bit Error vs. Frequency Relative Phase vs. Frequency (Only Major States are Shown) (Only Major States are Shown) 80 2 1.5 0.5-8B RELATIVE PHASE (deg) 60 1 BIT ERROR (dB) ATTENUATORS - SMT Insertion Loss 31.5 dB 0.5 0 -0.5 -1 16 dB 40 31.5 dB 16 dB 20 8 dB 0 -20 -1.5 0.5-4 dB -2 -40 0 0.5 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) 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 6 - 183 HMC542LP4 / 542LP4E v00.0306 0.5 dB LSB GaAs MMIC 6-BIT DIGITAL SERIAL CONTROL ATTENUATOR, DC - 3.0 GHz Worst Case Step Error Between Successive Attenuation States 6 CMOS Control Voltages 1 State STEP ERROR (dB) 0.6 ATTENUATORS - SMT Vcc = +5V 0.8 0.4 0.2 Low 0 to 1.3V High 3.5 to 5.0V Serial Input Truth Table 0 -0.2 -0.4 Latch Enable Shift Clock -0.6 X X L Shift register cleared -0.8 X Ç H Shift register clocked Ç X H Contents of shift register transferrred to Digital Attenuator Reset -1 0 0.5 1 1.5 2 2.5 3 3.5 4 FREQUENCY (GHz) Timing Function Truth Table Symbol Vcc = +5V Control Voltage Input Units Parameter Min. Max. Serial Input Setup Time ts 20 - ns Hold time from Serial Input to Shift Clock th 0 - ns Setup time from Shift Clock to Latch Enable tlsup 40 - ns Propagation delay, Latch Enable to C0.5 through C8 tpd Setup time from Reset to Shift Clock - Clock Frequency (1/tclk) fclk - 20 - 30 30 ns ns MHz C16 C8 C4 C2 C1 C0.5 High High High High High High Reference I.L. High High High High High Low 0.5 dB High High High High Low High 1 dB High High High Low High High 2 dB High High Low High High High 4 dB High Low High High High High 8 dB Low High High High High High 16 dB Low Low Low Low Low Low 31.5 dB Any combination of the above states will provide an attenuation approximately equal to the sum of the bits selected. Timing Diagram 6 - 184 Attenuation State 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 HMC542LP4 / 542LP4E v00.0306 0.5 dB LSB GaAs MMIC 6-BIT DIGITAL SERIAL CONTROL ATTENUATOR, DC - 3.0 GHz Logic / Functional Diagram ATTENUATORS - SMT 6 Programming Example to Select 16 dB Attenuation State 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 6 - 185 HMC542LP4 / 542LP4E v00.0306 0.5 dB LSB GaAs MMIC 6-BIT DIGITAL SERIAL CONTROL ATTENUATOR, DC - 3.0 GHz Pin Descriptions ATTENUATORS - SMT 6 Pin Number Function Description 1, 3, 5, 12, 14, 16-18, 23 N/C These pins should be connected to PCB RF ground to maximize performance. 2 Vcc Supply Voltage. 4, 15 RF1, RF2 This pin is DC coupled and matched to 50 Ohms Blocking capacitors are required. Select value based on lowest frequency of operation. 6 - 11, 13 ACG1 - ACG7 External capacitor to ground is required. Select value for lowest frequency of operation. Place capacitor as close to pins as possible. 19 Serial Output Serial data output. Serial input data delayed by 8 clock cycles 20 Reset 21 Shift Clock 22 Latch Enable Interface Schematic See truth table, control voltage table and timing diagram. 24 Serial Input GND 6 - 186 Package bottom has an exposed metal paddle that must be connected to RF/DC Ground. 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 HMC542LP4 / 542LP4E v00.0306 0.5 dB LSB GaAs MMIC 6-BIT DIGITAL SERIAL CONTROL ATTENUATOR, DC - 3.0 GHz Application Circuit ATTENUATORS - SMT 6 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 6 - 187 HMC542LP4 / 542LP4E v00.0306 0.5 dB LSB GaAs MMIC 6-BIT DIGITAL SERIAL CONTROL ATTENUATOR, DC - 3.0 GHz Bias Voltage Absolute Maximum Ratings ATTENUATORS - SMT 6 RF Input Power (DC - 3.0 GHz) +27 dBm (T = +85 °C) Digital Inputs (Reset, Shift Clock, Latch Enable & Serial Input) -1.5 to (Vcc +1.5V) Vdc Bias Voltage (Vcc) +7.0 Vdc Channel Temperature 150 °C Continuous Pdiss (T = 85 °C) (derate 7.7 mW/°C above 85 °C) 0.5 W Thermal Resistance 130 °C/W Storage Temperature -65 to +150 °C Operating Temperature -40 to +85 °C Vcc (Vdc) Idd (Typ.) (mA) +4.5 4.7 +5.0 5.0 +5.5 5.3 ELECTROSTATIC SENSITIVE DEVICE OBSERVE HANDLING PRECAUTIONS 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 HMC542LP4 Low Stress Injection Molded Plastic Sn/Pb Solder MSL1 HMC542LP4E RoHS-compliant Low Stress Injection Molded Plastic 100% matte Sn MSL1 Package Marking [3] [1] H472 XXXX [2] H472 XXXX [1] Max peak reflow temperature of 235 °C [2] Max peak reflow temperature of 260 °C [3] 4-Digit lot number XXXX 6 - 188 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 HMC542LP4 / 542LP4E v00.0306 0.5 dB LSB GaAs MMIC 6-BIT DIGITAL SERIAL CONTROL ATTENUATOR, DC - 3.0 GHz Evaluation PCB ATTENUATORS - SMT 6 List of Materials for Evaluation PCB 114399 [1] Item Description J1 - J2 PCB Mount SMA Connector J3 14 Pin DC Connector C1 1000 pF Capacitor, 0603 Pkg. C2, C3 1000 pF Capacitor, 0402 Pkg. C4 - C7 330 pF Capacitor, 0402 Pkg. U1 HMC542LP4 / HMC542LP4E Digital Attenuator PCB [2] 114398 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 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. [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 6 - 189