HMC624LP4 / 624LP4E v09.0210 ATTENUATORS - DIGITAL - SMT 8 0.5 dB LSB GaAs MMIC 6-BIT DIGITAL ATTENUATOR, DC - 6 GHz Typical Applications Features The HMC624LP4(E) is ideal for: 0.5 dB LSB Steps to 31.5 dB • Cellular/3G Infrastructure Power-Up State Selection • WiBro / WiMAX / 4G High Input IP3: +55 dBm • Microwave Radio & VSAT Low Insertion Loss: 2.2 dB @ 3.5 GHz • Test Equipment and Sensors TTL/CMOS Compatible, Serial, Parallel or Latched Parallel Control • IF & RF Applications ±0.25 dB Typical Step Error Single +3V or +5V Supply 24 Lead 4x4mm SMT Package: 16mm2 Functional Diagram General Description The HMC624LP4(E) is a broadband 6-bit GaAs IC Digital Attenuator in a low cost leadless SMT package. This versatile digital attenuator incorporates off-chip AC ground capacitors for near DC operation, making it suitable for a wide variety of RF and IF applications. The dual mode control interface is CMOS/TTL compatible, and accepts either a three wire serial input or a 6 bit parallel word. The HMC624LP4(E) also features a user selectable power up state and a serial output port for cascading other Hittite serial controlled components. The HMC624LP4(E) is housed in a RoHS compliant 4x4 mm QFN leadless package, and requires no external matching components. Electrical Specifications, TA = +25° C, 50 Ohm System, with Vdd = +5V & Vctl = 0/+5V (Unless Otherwise Noted) Parameter Insertion Loss Frequency (GHz) DC - 3 GHz 3.0 - 6.0 GHz Attenuation Range Typ. Max. Units 1.8 2.8 2.4 3.8 dB dB 31.5 dB DC - 6 GHz 15 dB DC - 0.8 GHz 0.8 - 6.0 GHz ± (0.10 + 5% of Atten. Setting) Max. ± (0.30 + 3% of Atten. Setting) Max. dB dB Input Power for 0.1 dB Compression DC - 6 GHz 30 dBm Input Third Order Intercept Point (Two-Tone Input Power= 10 dBm Each Tone) DC - 6 GHz 55 dBm Return Loss (ATTIN, ATTOUT, All Atten. States) Attenuation Accuracy: (Referenced to Insertion Loss) All Attenuation States 8-1 Min. For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com Application Support: Phone: 978-250-3343 or [email protected] HMC624LP4 / 624LP4E v09.0210 0.5 dB LSB GaAs MMIC 6-BIT DIGITAL ATTENUATOR, DC - 6 GHz Insertion Loss vs. Temperature (Only Major States are Shown) -1 -2 -3 +25 C +85 C -40 C -4 -5 -5 8 dB -10 16 dB -15 -20 -25 31.5 dB -30 -35 0 1 2 3 4 5 6 0 1 2 FREQUENCY (GHz) Input Return Loss [1] 4 5 6 5 6 5 6 Output Return Loss [1] (Only Major States are Shown) (Only Major States are Shown) 0 0 -5 -5 -10 -10 -15 RETURN LOSS (dB) RETURN LOSS (dB) 3 FREQUENCY (GHz) IL -20 -25 -30 16 dB -35 -15 2 dB -20 -25 31.5 dB -30 1 dB -35 31.5 dB -40 8 dB -40 0 1 2 3 4 5 6 ATTENUATORS - DIGITAL - SMT 0 NORMALIZED ATTENUATION (dB) INSERTION LOSS (dB) 0 0 1 16 dB 2 FREQUENCY (GHz) 3 4 FREQUENCY (GHz) Bit Error vs. Attenuation State Bit Error vs. Frequency [2] (Only Major States are Shown) [2] 2 1 500MHz 0.8 1.5 4GHz 0.6 31.5 dB 1 0.4 BIT ERROR (dB) BIT ERROR (dB) 8 Normalized Attenuation [1] [1] 0.2 0 -0.2 -0.4 2GHz, 3GHz -0.6 0.5 0 -0.5 -1 100MHz, 1GHz -1.5 -0.8 -2 -1 0 4 8 12 16 20 24 28 32 ATTENUATION STATE (dB) 0 1 2 3 4 FREQUENCY (GHz) [1] Data taken with bias tees on input and output RF ports. [2] C1, C6 = 330pF For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com Application Support: Phone: 978-250-3343 or [email protected] 8-2 HMC624LP4 / 624LP4E v09.0210 0.5 dB LSB GaAs MMIC 6-BIT DIGITAL ATTENUATOR, DC - 6 GHz 8 Worst Case Step Error Between Successive Attenuation States [2] IP3 vs. Temperature [2] 80 0.6 70 8 dB 0.4 0.2 IP3 (dBm) STEP ERROR (dB) ATTENUATORS - DIGITAL - SMT 1 0.8 0 -0.2 60 50 4 dB -0.4 16 dB -0.6 40 -0.8 -1 30 0 1 2 3 4 5 6 0 1 FREQUENCY (GHz) 2 3 4 5 6 FREQUENCY (GHz) Serial Control Interface The HMC624LP4E contains a 3-wire SPI compatible digital interface (SERIN, CLK, LE). The serial control interface is activated when P/S is kept high. The 6-bit serial word must be loaded MSB first. The positive-edge sensitive CLK and LE requires clean transitions. If mechanical switches are used, sufficient debouncing should be provided. When LE is high, 6-bit data in the serial input register is transferred to the attenuator. When LE is high CLK is masked to prevent data transition during output loading. When P/S is low, 3-wire SPI interface inputs (SERIN, CLK, LE) are disabled and the input register is loaded with parallel digital inputs (D0-D5). When LE is high, 6-bit parallel data changes the state of the part per truth table. For all modes of operations, the state will stay constant while LE is kept low. 8-3 For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com Application Support: Phone: 978-250-3343 or [email protected] HMC624LP4 / 624LP4E v09.0210 0.5 dB LSB GaAs MMIC 6-BIT DIGITAL ATTENUATOR, DC - 6 GHz Parallel Mode (Direct Parallel Mode & Latched Parallel Mode) Parameter Typ. Min. serial period, tSCK 100 ns Control set-up time, tCS 20 ns Control hold-time, tCH 20 ns LE setup-time, tLN 10 ns Min. LE pulse width, tLEW 10 ns Min LE pulse spacing, tLES 630 ns Serial clock hold-time from LE, tCKN 10 ns Hold Time, tPH. 0 ns Latch Enable Minimum Width, tLEN 10 ns Setup Time, tPS 2 ns Note: The parallel mode is enabled when P/S is set to low. Direct Parallel Mode - The attenuation state is changed by the control voltage inputs D0-D5 directly. The LE (Latch Enable) must be at a logic high at all times to control the attenuator in this manner. Latched Parallel Mode - The attenuation state is selected using the control voltage inputs D0-D5 and set while the LE is in the Low state. The attenuator will not change state while LE is Low. Once all Control Voltage Inputs are at the desired states the LE is pulsed. See timing diagram above for reference. Power-Up States PUP Truth Table If LE is set to logic LOW at power-up, the logic state of PUP1 and PUP2 determines the power-up state of the part per PUP truth table. If the LE is set to logic HIGH at power-up, the logic state of D0-D5 determines the power-up state of the part per truth table. The attenuator latches in the desired power-up state approximately 200 ms after power-up. Power-On Sequence The ideal power-up sequence is: GND, Vdd, digital inputs, RF inputs. The relative order of the digital inputs are not important as long as they are powered after Vdd / GND Bias Voltage LE PUP1 PUP2 Relative Attenuation 0 0 0 -31.5 0 1 0 -24 0 0 1 -16 0 1 1 Insertion Loss 1 X X 0 to -31.5 dB Note: The logic state of D0 - D5 determines the power-up state per truth table shown below when LE is high at power-up. Truth Table Control Voltage Input D5 D4 D3 D2 D1 D0 Reference Insertion Loss High High High High High High 0 dB Idd (Typ.) (mA) High High High High High Low -0.5 dB 3 1.8 High High High High Low High -1 dB 5 2.0 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 Vdd (V) Control Voltage Table State Vdd = +3V Vdd = +5V Low 0 to 0.5V @ <1 µA 0 to 0.8V @ <1 µA High 2 to 3V @ <1 µA 2 to 5V @ <1 µA ATTENUATORS - DIGITAL - SMT 8 Timing Diagram (Latched Parallel Mode) Any combination of the above states will provide an attenuation equal to the sum of the bits selected. For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com Application Support: Phone: 978-250-3343 or [email protected] 8-4 HMC624LP4 / 624LP4E v09.0210 0.5 dB LSB GaAs MMIC 6-BIT DIGITAL ATTENUATOR, DC - 6 GHz ATTENUATORS - DIGITAL - SMT 8 Absolute Maximum Ratings RF Input Power (DC - 6 GHz) 28 dBm (T = +85 °C) Digital Inputs (Reset, Shift Clock, Latch Enable & Serial Input) -0.5 to Vdd +0.5V Bias Voltage (Vdd) 5.6V Channel Temperature 150 °C Continuous Pdiss (T = 85 °C) (derate 9.8 mW/°C above 85 °C) [1] 0.635 W Thermal Resistance 102 °C/W Storage Temperature -65 to +150 °C Operating Temperature -40 to +85 °C 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 HMC624LP4 Low Stress Injection Molded Plastic Sn/Pb Solder MSL1 [1] HMC624LP4E RoHS-compliant Low Stress Injection Molded Plastic 100% matte Sn MSL1 [2] Package Marking [3] H624 XXXX H624 XXXX [1] Max peak reflow temperature of 235 °C [2] Max peak reflow temperature of 260 °C [3] 4-Digit lot number XXXX 8-5 For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com Application Support: Phone: 978-250-3343 or [email protected] HMC624LP4 / 624LP4E v09.0210 0.5 dB LSB GaAs MMIC 6-BIT DIGITAL ATTENUATOR, DC - 6 GHz Pin Number Function Description 1 P/S 2 CLK 3 SERIN 4 LE 5, 14 GND These pins and package bottom must be connected to RF/DC ground. 6, 13 ATTIN, ATTOUT These pins are DC coupled and matched to 50 Ohms. Blocking capacitors are required. Select value based on lowest frequency of operation. 7 - 12 ACG1 - ACG6 External capacitors to ground is required. Select value for lowest frequency of operation. Place capacitor as close to pins as possible. 15 SEROUT Serial input data delayed by 6 clock cycles. 16, 17 PUP2, PUP1 19 - 24 D5, D4, D3, D2, D1, D0 18 Vdd Interface Schematic See truth table, control voltage table and timing diagram. ATTENUATORS - DIGITAL - SMT 8 Pin Descriptions See truth table, control voltage table and timing diagram. Supply voltage For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com Application Support: Phone: 978-250-3343 or [email protected] 8-6 HMC624LP4 / 624LP4E v09.0210 0.5 dB LSB GaAs MMIC 6-BIT DIGITAL ATTENUATOR, DC - 6 GHz Application Circuit ATTENUATORS - DIGITAL - SMT 8 8-7 For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com Application Support: Phone: 978-250-3343 or [email protected] HMC624LP4 / 624LP4E v09.0210 0.5 dB LSB GaAs MMIC 6-BIT DIGITAL ATTENUATOR, DC - 6 GHz 8 ATTENUATORS - DIGITAL - SMT Evaluation PCB List of Materials for Evaluation PCB 117212 [1] Item Description J1, J2 PCB Mount SMA Connector J3 18 Pin DC Connector J8, J11 DC Pin C1, C6 330 pF Capacitor, 0402 Pkg. C7, C8 1000 pF Capacitor, 0402 Pkg. R1 - R14 100 kOhm Resistor, 0402 Pkg. SW1, SW2 SPDT 4 Position DIP Switch U1 HMC624LP4(E) Digital Attenuator PCB [2] 117210 Evaluation PCB The circuit board used in the 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: Arlon 25FR For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com Application Support: Phone: 978-250-3343 or [email protected] 8-8