DATA SHEET SKY12407-321LF: 50-600 MHz, 12 dB 100 Ω Differential Digital Attenuator Applications • Cellular/3G infrastructure • IF/RF systems Features • Dual, positive voltage operation: 0/1.8-5.0 V • High bit accuracy: ±0.3 dB @ 200 MHz • Low insertion loss: 0.3 dB @ 200 MHz • Absorptive in 100 Ω differential systems • Small, QFN (12-pin, 3 x 3 mm) package (MSL1, 260 °C per JEDEC J-STD-020) Figure 1. SKY12407-321LF Block Diagram Description The SKY12407-321LF is a GaAs pHEMT two-bit attenuator I/C. The device is provided in a 3 x 3 mm 12-pin Quad Flat No-Lead (QFN) package. The SKY12407-321LF is particularly suited for 100 Ω differential systems for which high attenuation accuracy, low insertion loss, and low intermodulation products are required. The attenuator’s differential input and output impedance is 100 Ω. The device is controlled by two positive DC voltage control pins. The differential attenuator paths are controlled together and can be in either an insertion loss or a 12 dB attenuation state. In a differential system, the attenuator presents a 100 Ω impedance, but can be used as two single-ended attenuators, each with a 50 Ω impedance. A functional block diagram is shown in Figure 1. The pin configuration and package are shown in Figure 2. Signal pin assignments and functional pin descriptions are provided in Table 1. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200935F • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • May 11, 2012 1 DATA SHEET • SKY12407-321LF DIFFERENTIAL DIGITAL ATTENUATOR Figure 2. SKY12407-321LF Pinout – 12-Pin QFN (Top View) Table 1. SKY12407-321LF Signal Descriptions Pin # Note: Name Description Pin # Name Description 1 RFIP Positive RF input. Comprises J1 along with pin 3. Must be DC blocked from external circuit. 7 RFON Negative RF output. Comprises J2 along with pin 9. Must be DC blocked from external circuit. 2 CBYPASS1 Must be AC-coupled to external circuit ground. 8 CBYPASS2 Must be AC-coupled to external circuit ground. 3 RFIN Negative RF input. Comprises J1 along with pin 1. Must be DC blocked from external circuit. 9 RFOP Positive RF output. Comprises J2 along with pin 7. Must be DC blocked from external circuit. 4 GND Ground 10 VCTL2 Control voltage input. 5 GND Ground 11 GND Ground 6 GND Ground 12 VCTL1 Control voltage input. Exposed pad must be grounded. Table 2. SKY12407-321LF Absolute Maximum Ratings Parameter Symbol Minimum Typical Maximum Units RF input power @ 5 V PIN +32 dBm Control voltage VCTL 6 V Operating temperature TOP –40 +85 °C Storage temperature TSTG –65 +150 °C Note: Exposure to maximum rating conditions for extended periods may reduce device reliability. There is no damage to device with only one parameter set at the limit and all other parameters set at or below their nominal value. Exceeding any of the limits listed here may result in permanent damage to the device. CAUTION: Although this device is designed to be as robust as possible, Electrostatic Discharge (ESD) can damage this device. This device must be protected at all times from ESD. Static charges may easily produce potentials of several kilovolts on the human body or equipment, which can discharge without detection. Industry-standard ESD precautions should be used at all times. Electrical and Mechanical Specifications The absolute maximum ratings of the SKY12407-321LF are provided in Table 2. Electrical specifications are provided in Table 3. Typical performance characteristics of the SKY12407-321LF are illustrated in Figures 3 through 6. The state of the SKY12407-321LF is determined by the logic provided in Table 4. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 2 May 11, 2012 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200935F DATA SHEET • SKY12407-321LF DIFFERENTIAL DIGITAL ATTENUATOR Table 3. SKY12407-321LF Electrical Specifications (Note 1) (VCTL = 0 to 3 V, TOP = +25 °C, PIN = 0 dBm, Characteristic Impedance [ZO] = 50 Ω (Single Ended), Unless Otherwise Noted) Parameter Symbol Test Condition Min Typical Max Units Insertion loss IL f = 50 to 600 MHz 0.30 0.40 dB Attenuation Attn f = 50 to 400 MHz 11.7 12.0 12.3 dB f = 400 to 600 MHz 11.5 12.0 12.3 dB Return loss, insertion loss state RL_IL f = 50 to 600 MHz 25 dB Return loss, attenuation state RL_AT f = 50 to 600 MHz 20 dB Switching speed, on TON 50% control to 90% RF 37 ns Switching speed, off TOFF 50% control to 10% RF 37 ns Switching speed, rise TRISE 10/90% RF 40 ns Switching speed, fall TFALL 90/10% RF 40 Attenuation settling time ATSET Attenuation change from 200 ns to 5 ms Attenuation phase setting (Note 2) ATPS Phase change from 200 ns to 5 ms 1 dB Input Compression Point IP1dB Insertion loss state, VCTL = 3.3 V: 0.5 dB Input Compression Point 3rd Order Input Intercept Point nd 2 harmonic 3rd harmonic Control current IP0.5dB IIP3 2fo 3fo ICTL Control voltage –2 ns 0.15 dB +2 deg f = 50 MHz +28 dBm f = 75 MHz +28 dBm f = 100 MHz +31 dBm f = 50 MHz +27 dBm f = 75 MHz +31 dBm f = 50 MHz, insertion loss state, PIN = +6 dBm +48 dBm f = 50 MHz, attenuation state, PIN = +18 dBm +45 dBm f = 75 MHz, attenuation state, PIN = +18 dBm +48 dBm f = 50 MHz, insertion loss state, PIN = +6 dBm +75 dBc f = 50 MHz, attenuation state, PIN = +18 dBm +60 dBc f = 50 MHz, insertion loss state, PIN = +6 dBm +85 dBc f = 50 MHz, attenuation state, PIN = +18 dBm +70 dBc VCTL = 3 V 10 μA Attenuation state, VCTL = 3.3 V: VCTL = 3.3 V: VCTL = low VCTL = high 0 1.8 0.2 5.0 V V Note 1: Performance is guaranteed only under the conditions listed in this Table. Note 2: Phase performance guaranteed by design, not measured. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200935F • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • May 11, 2012 3 DATA SHEET • SKY12407-321LF DIFFERENTIAL DIGITAL ATTENUATOR Typical Performance Characteristics (CBLK = 1000 pF, CBYPASS = 1000 pF, VCTL = 3 V, TOP = +25 °C, Characteristic Impedance [ZO] = 50 Ω, Driven and Measured Single-Ended, Unless Otherwise Noted) Figure 3. Typical Insertion Loss Figure 4. Return Loss Insertion State Figure 5. Typical Attenuation (Normalized to Insertion Loss) Figure 6. Return Loss Attenuation State Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 4 May 11, 2012 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200935F DATA SHEET • SKY12407-321LF DIFFERENTIAL DIGITAL ATTENUATOR Table 4. SKY12407-321LF Truth Table State (J1-J2) VCTL1 VCTL2 Reference insertion loss high low 12 dB attenuation low high Note: high = +1.8 to 5.0 V low = 0 V Any state other than described in this Table places the attenuator into an undefined state. Evaluation Board Description Package and Handling Information The SKY12407-321LF Evaluation Board is used to test the performance of the SKY12407-321LF digital attenuator. An assembly drawing for the Evaluation Board is shown in Figure 7 and an Evaluation Board schematic diagram is shown in Figure 8. Table 5 provides the Bill of Materials (BOM) list for Evaluation Board components. Instructions on the shipping container label regarding exposure to moisture after the container seal is broken must be followed. Otherwise, problems related to moisture absorption may occur when the part is subjected to high temperature during solder assembly. Package Dimensions The PCB layout footprint for the SKY12407-321LF is shown in Figure 9. Typical case markings are noted in Figure 10. Package dimensions for the 12-pin QFN are shown in Figure 11, and tape and reel dimensions are provided in Figure 12. THE SKY12407-321LF is rated to Moisture Sensitivity Level 1 (MSL1) at 260 °C. It can be used for lead or lead-free soldering. For additional information, refer to the Skyworks Application Note, Solder Reflow Information, document number 200164. Care must be taken when attaching this product, whether it is done manually or in a production solder reflow environment. Production quantities of this product are shipped in a standard tape and reel format. Figure 7. SKY12407-321LF Evaluation Board Assembly Diagram Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200935F • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • May 11, 2012 5 DATA SHEET • SKY12407-321LF DIFFERENTIAL DIGITAL ATTENUATOR Figure 8. SKY12407-321LF Evaluation Board Schematic Diagram Table 5. SKY12407-321LF Evaluation Board bill of Materials Component Value Size Manufacturer/Part Series CBLK 1000 pF 0402 Murata GRM CBP1, CBP2 1000 pF 0402 Murata GRM Figure 9. SKY12407-321LF PCB Layout Footprint Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 6 May 11, 2012 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200935F DATA SHEET • SKY12407-321LF DIFFERENTIAL DIGITAL ATTENUATOR Figure 10. Typical Part Markings (Top View) Figure 11. SKY12407-321LF 12-Pin QFN Package Dimensions Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200935F • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • May 11, 2012 7 DATA SHEET • SKY12407-321LF DIFFERENTIAL DIGITAL ATTENUATOR Figure 12. SKY12407-321LF Tape and Reel Dimensions Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 8 May 11, 2012 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200935F DATA SHEET • SKY12407-321LF DIFFERENTIAL DIGITAL ATTENUATOR Ordering Information Model Name SKY12407-321LF Differential Digital Attenuator Manufacturing Part Number SKY12407-321LF Evaluation Board Part Numbers SKY12407-321LF-EVB Copyright © 2008, 2009, 2010, 2011, 2012 Skyworks Solutions, Inc. All Rights Reserved. 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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200935F • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • May 11, 2012 9