DATA SHEET SKY12230-12LF: High IIP3, 1.7 to 2.3 GHz Variable Attenuator Applications Control Current Control Current RF In/Out RF In/Out Automatic power leveling/gain control circuits in cellular base stations and point-to-point radio IF chains General wireless systems including LTE, WCDMA, VSAT, and military communications Features SOIC (8-pin, 6.0 x 4.9 mm) package (MSL3, 260 C per JEDEC J-STD-020) Skyworks GreenTM products are compliant with all applicable legislation and are halogen-free. For additional information, refer to Skyworks Definition of GreenTM, document number SQ04–0074. S3206 Broadband operating range: 1.7 to 2.3 GHz Attenuation range: >18.5 dB Low insertion loss: 1.2 dB High IIP3: +53 dBm typical Low current consumption: <2 mA @ maximum attenuation Figure 1. SKY12230-12LF Block Diagram Description The SKY12230-12LF is a current-controlled variable attenuator from Skyworks series of high third order input intercept point (IIP3) components. The device has been designed to operate over the 1.7 to 2.3 GHz frequency band, but is specifically optimized for use as a wide dynamic range, low distortion attenuator. The SKY12230-12LF provides monotonic attenuation performance over its entire control current range. This attenuator is comprised of a pair of matched PIN diodes that terminate two ports of its internal 90-degree hybrid coupler. The diodes are biased using an external control current signal. The attenuator operates with a control current range of 0 to 1.3 mA. 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 202532D • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • April 6, 2014 1 I_CONTROL GND GND RF_OUT 8 7 6 5 1 2 3 4 I_CONTROL GND GND RF_IN DATA SHEET • SKY12230-12LF: VARIABLE ATTENUATOR S3218 Figure 2. SKY12230-12LF Pinout – 8-Pin SOIC (Top View) Table 1. SKY12230-12LF Signal Descriptions Pin Name Description Pin Name Description 1 I_CONTROL Control current input (current applied is nominally equal to the current applied to pin 8) 5 RF_OUT RF output. Input and output are interchangeable. 2 GND Ground. Must be connected to PCB ground using lowest possible inductance path. 6 GND Ground. Must be connected to PCB ground using lowest possible inductance path. 3 GND Ground. Must be connected to PCB ground using lowest possible inductance path. 7 GND Ground. Must be connected to PCB ground using lowest possible inductance path. 4 RF_IN RF input. Input and output are interchangeable. 8 I_CONTROL Control current input (current applied is nominally equal to the current applied to pin 1) Technical Description The SKY12230-12LF is comprised of a matched pair of silicon PIN attenuator diodes and a hybrid coupler. Each of the PIN diodes terminate a coupled ouptut of the coupler. The impedance of these diodes is controlled by a current applied from an external source. At 0 mA bias, the impedance of the diode is very large. As the impedance of these diodes varies from a very large magnitude to 50 Ω, the insertion loss between the input (pin 4) and output (pin 5) ports of the hybrid varies from low to maximum attenuation. If the bias current is increased beyond the value that produces a 50 Ω resistance in each diode, the attenuation between the input and output decreases. Diodes D1 and D2 are RF terminations, so it is important to provide the control current to these diodes using low-pass filters. Each of the filters has a 22 nH series inductor and a shunt 220 pF capacitor. The values of these components are selected for best DC bypassing and RF blocking of the RF signals present at the anodes of both diodes. A 1.8 kΩ resistor serves as a voltage-to-current converter. In the forward biased state, the DC voltage produced across D1 and D2 is roughly 0.7 V. The total control current to the PIN diodes is approximated by the following equation: I CONTROL VCONTROL 0.7 1800 Approximately 50 percent of the control current (ICONTROL) flows equally through each diode. The forward voltages are very well matched since both diodes are manufactured on a single die. The control voltage (VCONTROL) should be varied from 0 V for minimum attenuation up to a voltage that produces the appropriate current to force each of the PIN diodes to produce 50 Ω and, therefore, maximum attenuation. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 2 April 6, 2015 • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • 202532D DATA SHEET • SKY12230-12LF: VARIABLE ATTENUATOR Electrical and Mechanical Specifications Performance characteristics for the SKY12230-12LF are illustrated in Figures 3 through 6. The absolute maximum ratings of the SKY12230-12LF are provided in Table 2. Electrical specifications are provided in Table 3. Table 2. SKY12230-12LF Absolute Maximum Ratings (Note 1) Parameter Symbol Minimum Maximum Units 10 V 0.5 4.0 W W Reverse diode voltage VREVERSE RF input power: CW @ 12.5% duty cycle PIN Control current ICONTROL 50 mA Storage temperature TSTG –65 +125 C Operating temperature TOP –40 +85 C Note 1: 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. Table 3. SKY12230-12LF Electrical Specifications (Note 1) (TOP = +25 C, ICONTROL = 0 to 1.3 mA, PIN = 0 dBm, Characteristic Impedance [ZO] = 50 Ω, Unless Otherwise Noted) Parameter Symbol Test Condition Min Insertion loss IL ICONTROL = 0 mA, f = 1.7 to 2.3 GHz Attenuation Attn ICONTROL = 1.3 mA, f = 2.15 GHz 18.5 Return loss RL ICONTROL = 0 mA, f = 1.7 to 2.3 GHz 9.5 Third order input intercept point IIP3 PIN = 0 dBm each tone, ICONTROL = 0 mA, spacing = 10 MHz, f = 1.7 to 2.3 GHz Switching characteristics: Rise, fall time On, off time tRISE, tFALL tON, tOFF 10/90% or 90/10% of RF 50% VCONTROL to 90/10% of RF Typical Max Units 1.3 1.5 dB 39.0 dB 22.0 dB +53 dBm 3 μs 1 μs Note 1: Performance is guaranteed only under the conditions listed in this table. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202532D • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • April 6, 2015 3 DATA SHEET • SKY12230-12LF: VARIABLE ATTENUATOR Typical Performance Characteristics (TOP = +25 C, VCONTROL = 0 to 3.0 V, PIN = 0 dBm, Characteristic Impedance [Zo] = 50 Ω, Unless Otherwise Noted) 0 –10 238 μA 0 μA –15 –10 Return Loss (dB) Insertion Loss (dB) –5 760 μA –15 –20 1357 μA 1301 μA –25 –30 0V 1V 2V 3V 1411 μA 1464 μA –35 –40 1.7 1.8 1.9 2.0 2.1 3.1 V 3.2 V 3.3 V 2.2 –20 –25 –30 0V 1.0 V 2.0 V 3.0 V 3.1 V –35 –40 1.7 2.3 1.8 1.9 Frequency (GHz) 2.2 2.3 Figure 4. Return Loss vs Frequency vs Control Voltage +60 0 1.7 GHz 2.0 GHz 2.2 GHz +55 –10 Attenuation (dB) +45 +40 +35 –15 –20 –25 –30 +30 –35 +25 –40 0 0.5 1.0 1.5 2.0 2.5 3.0 1.7 GHz 2.0 GHz 2.3 GHz –5 +50 IIIP3 (dBm) 2.1 Frequency (GHz) Figure 3. Insertion Loss vs Frequency vs Control Voltage +20 2.0 3.2 V 3.3 V 3.4 V 3.5 V 3.6 V 3.5 Control Voltage (V) Figure 5. IIP3 vs Control Voltage vs Frequency (PIN = 0 dBm, Spacing = 10 MHz) –45 0 200 400 600 800 1000 1200 1400 1600 1800 Control Current (μA) Figure 6. Attenuation vs Control Current vs Frequency Evaluation Board Description Package and Handling Information The SKY12230-12LF Evaluation Board is used to test the performance of the SKY12230-12LF variable attenuator. An assembly drawing for the Evaluation Board is shown in Figure 7 and the layer detail is provided in Figure 8. An Evaluation Board schematic is shown in Figure 9. Table 4 provides the Bill of Materials (BOM) list for Evaluation Board components. Since the device package is sensitive to moisture absorption, it is baked and vacuum packed before shipping. 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. The attenuation level of the SKY12230-12LF is controlled by applying 0 to 3 V to the VCONTROL pin on the Evaluation Board (see Figure 7). The SKY12230-12LF is rated to Moisture Sensitivity Level 3 (MSL3) 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. Package Dimensions The PCB layout footprint for the SKY12230-12LF is shown in Figure 10. Typical part markings are shown in Figure 11. Package dimensions for the 8-pin SOIC are shown in Figure 12, and tape and reel dimensions are provided in Figure 13. 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. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 4 April 6, 2015 • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • 202532D GND VCONTROL DATA SHEET • SKY12230-12LF: VARIABLE ATTENUATOR RF_IN RF_OUT S3215 Figure 7. SKY12230-12LF Evaluation Board Assembly Diagram Cross Section Name Thickness (in) Material Top Soldermask L1 (0.0028) Cu foil 0.012 ± 0.0006 Rogers RO4003C Core L2 (0.0014) Cu foil Laminate (Note 1) FR4 Prepreg L3 (0.0014) Cu foil 0.010 ± 0.0006 FR4 Core (0.0028) Cu foil Laminate Laminate L4 Bottom Soldermask Note 1: Adjust this thickness to meet total thickness goal of 0.062 ± 0.005 inches. S2531 Figure 8. Layer Detail Physical Characteristics Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202532D • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • April 6, 2015 5 DATA SHEET • SKY12230-12LF: VARIABLE ATTENUATOR Control Voltage R1 1.8 kΩ C1 220 pF L1 22 nH C2 220 pF 8 1 I_CONTROL I_CONTROL 7 2 GND GND GND GND 6 3 5 4 C3 100 pF L2 22 nH RF_IN RF Input RF_OUT C4 100 pF RF Output S3219a Figure 9. SKY12230-12LF Evaluation Board Schematic Table 4. SKY12230-12LF Evaluation Board Bill of Materials Component Value Size Manufacturer Part Number C1, C2 220 pF 0402 Murata GRM1555C1H221J C3, C4 100 pF 0402 Murata GRM1555C1H101J L1, L2 22 nH 0402 Coilcraft 0402CS-22NXJLU R1 1.8 kΩ 0402 Panasonic ERJ-2GEJ182X Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 6 April 6, 2015 • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • 202532D DATA SHEET • SKY12230-12LF: VARIABLE ATTENUATOR 0.1630 0.0200 Diam. Via 4 Places 0.0555 Typ. 0.0190 Typ. Dimensions are in inches S3220 Figure 10. SKY12230-12LF PCB Layout Footprint Skyworks Part # Pin 1 Indicator Date Code: (YY = Calendar Year WW = Week) Figure 11. Typical Part Markings (Top View) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202532D • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • April 6, 2015 7 DATA SHEET • SKY12230-12LF: VARIABLE ATTENUATOR Pin 8 0.050 (1.27 mm) BSC 0.244 (6.20 mm) 0.228 (5.80 mm) Pin 1 Indicator 0.020 (0.51 mm) Max. Pin 1 0.049 (1.24 mm) 0.016 (0.41 mm) 0.068 (1.73 mm) Max. 0.016 Max. (0.41 mm) x 45° Chamfer 8° Max. 0.158 (4.00 mm) 0.150 (3.80 mm) 0.010 (0.25 mm) 0.007 (0.17 mm) 0.197 (5.00 mm) 0.189 (4.80 mm) 0.010 (0.25 mm) 0.004 (0.10 mm) Dimensions are in inches (millimeters shown in parentheses) S3217 Figure 12. SKY12230-12LF 8-Pin SOIC Package Dimensions 4.00 ± 0.10 8.00 ± 0.10 Ø1.55 ± 0.05 1.75 ± 0.10 2.00 ± 0.05 Pin 1 A A 12.00 ± 0.30 –0.10 5.49 ± 0.10 (Bo) 5° Max 5.50 ± 0.05 B 0.292 ± 0.13 (T) B 1.68 ± 0.10 (Ko) Ø1.50 +0.25 8° Max 6.88 ± 0.10 (Ao) Notes: 1. Carrier tape must meet all requirements of Skyworks GP01-D232 procurement spec for tape and reel shipping. 2. Carrier tape material: black conductive polycarbonate or polystyrene. 3. Cover tape material: transparent conductive pressure sensitive adhesive (PSA) material with 9.30 mm width. 4. ESD surface resistivity shall be less than 1 x 108 Ohms/Square per EIA, JEDEC TNR specification. 5. All dimensions are in millimeters. 6. Part number US019881 (Please indicate on purchase order). Figure 13. SKY12230-12LF Tape and Reel Dimensions Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 8 April 6, 2015 • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • 202532D Y1848 DATA SHEET • SKY12230-12LF: VARIABLE ATTENUATOR Ordering Information Model Name SKY12230-12LF: Variable Attenuator Manufacturing Part Number SKY12230-12LF Evaluation Board Part Number SKY12230-12LF-EVB Copyright © 2012-2013, 2015 Skyworks Solutions, Inc. All Rights Reserved. Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. These materials, including the information contained herein, are provided by Skyworks as a service to its customers and may be used for informational purposes only by the customer. Skyworks assumes no responsibility for errors or omissions in these materials or the information contained herein. Skyworks may change its documentation, products, services, specifications or product descriptions at any time, without notice. Skyworks makes no commitment to update the materials or information and shall have no responsibility whatsoever for conflicts, incompatibilities, or other difficulties arising from any future changes. No license, whether express, implied, by estoppel or otherwise, is granted to any intellectual property rights by this document. Skyworks assumes no liability for any materials, products or information provided hereunder, including the sale, distribution, reproduction or use of Skyworks products, information or materials, except as may be provided in Skyworks Terms and Conditions of Sale. 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Skyworks products are not intended for use in medical, lifesaving or life-sustaining applications, or other equipment in which the failure of the Skyworks products could lead to personal injury, death, physical or environmental damage. Skyworks customers using or selling Skyworks products for use in such applications do so at their own risk and agree to fully indemnify Skyworks for any damages resulting from such improper use or sale. Customers are responsible for their products and applications using Skyworks products, which may deviate from published specifications as a result of design defects, errors, or operation of products outside of published parameters or design specifications. Customers should include design and operating safeguards to minimize these and other risks. Skyworks assumes no liability for applications assistance, customer product design, or damage to any equipment resulting from the use of Skyworks products outside of stated published specifications or parameters. Skyworks and the Skyworks symbol are trademarks or registered trademarks of Skyworks Solutions, Inc., in the United States and other countries. Third-party brands and names are for identification purposes only, and are the property of their respective owners. Additional information, including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202532D • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • April 6, 2015 9