skyworks solutions, inc. ? phone [ 781] 376-3000 ? fax [781] 376-3100 ? sales@ skyworksinc.com ? www.skyworksinc.com 202500d ? skyworks proprietary and confiden tial information ? produc ts and product information ar e subject to change witho ut notice ? april 6, 2015 1 data sheet sky12228-12lf: high iip3, 0.7 to 1.0 ghz variable attenuator applications ? 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 ? 0.7 to 1.0 ghz broadband operating range ? attenuation range: >18.5 db ? low insertion loss: 0.7 db ? high iip3: +60 dbm typical ? low current consumption: <2 ma @ maximum attenuation ? soic (8-pin, 6.0 x 4.9 mm) package (msl3, 260 ? c per jedec j-std-020) s kywork s g reen tm product s are compliant with all applicable legi s lation and are halogen-free. for additional information, refer to skyworks de?ition of green tm , document number s q04C0074. c ontrol c urrent c ontrol c urrent rf in/out rf in/out s 320 6 figure 1. sky12228-12lf block diagram description the sky12228-12lf 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 0.7 to 1.0 ghz frequency band, but is specifically optimized for use as a wide dynamic range, low distortion attenuator. the sky12228-12lf 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 1.5 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.
data sheet ? sky12228-12lf: variable attenuator skyworks solutions, inc. ? phone [ 781] 376-3000 ? fax [781] 376-3100 ? sales@ skyworksinc.com ? www.skyworksinc.com 2 april 6, 2015 ? skyworks prop rietary and confidential information ? produc ts and product informatio n are subject to chang e without notice ? 202500d s321 8 i_ c ontrol g nd g nd rf_in i_ c ontrol g nd g nd rf_out 87 6 5 1234 figure 2. sky12228-12lf pinout C 8-pin soic (top view) table 1. sky12228-12lf 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 sky12228-12lf 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 , 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 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 100 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 1.6 k 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: ?? 1600 7 . 0 v i control control ? ? approximately 50 percent of the control current (i control ) flows equally through each diode. the forward voltages are very well matched since both diodes are manufactured on a single die. the control voltage (v control ) 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 and, therefore, maximum attenuation.
data sheet ? sky12228-12lf variable attenuator skyworks solutions, inc. ? phone [ 781] 376-3000 ? fax [781] 376-3100 ? sales@ skyworksinc.com ? www.skyworksinc.com 202500d ? skyworks proprietary and confiden tial information ? produc ts and product information ar e subject to change witho ut notice ? april 6, 2015 3 electrical and mechanical specifications the absolute maximum ratings of the sky12228-12lf are provided in table 2. electrical specifications are provided in table 3. performance characteristics for the sky12228-12lf are illustrated in figures 3 through 6. table 2. sky12228-12lf absolute maximum ratings (note 1) parameter symbol minimum maximum units reverse diode voltage v reverse 10 v rf input power: cw @ 12.5% duty cycle p in 0.5 4.0 w w control current i control 50 ma storage temperature t stg C65 +125 ? c operating temperature t op C40 +85 ? c note 1: exposure to maximum rating conditions for extended periods may reduce device reliability. there is no damage to device with on ly 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 d evice. caution : although this device is designed to be as robust as possible, electrostatic discharge (esd) can damage this device. this devi ce must be protected at all times from esd. static charges may eas ily 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. sky12228-12lf electrical specifications (note 1) (t op = +25 ? c, i control = 0 to 1.5 ma, p in = 0 dbm, characteristic impedance [z o ] = 50 , unless otherwise noted) parameter symbol test condition min typical max units insertion loss il i control = 0 ma, f = 0.7 to 1.0 ghz 0.7 1.5 db attenuation attn i control = 1.5 ma, f = 0.85 ghz 18.5 39.0 db return loss rl i control = 0 ma, f = 0.7 to 1.0 ghz 9.5 22.0 db third order input intercept point iip3 p in = 0 dbm each tone, i control = 0 ma, spacing = 10 mhz, f = 0.7 to 1.0 ghz +60 dbm switching characteristics: rise, fall time on, off time t rise , t fall t on , t off 10/90% or 90/10% of rf 50% v control to 90/10% of rf 3 2 s s note 1: performance is guaranteed only under the conditions listed in this table.
data sheet ? sky12228-12lf: variable attenuator skyworks solutions, inc. ? phone [ 781] 376-3000 ? fax [781] 376-3100 ? sales@ skyworksinc.com ? www.skyworksinc.com 4 april 6, 2015 ? skyworks prop rietary and confidential information ? produc ts and product informatio n are subject to chang e without notice ? 202500d typical performance characteristics (t op = +25 ? c, v control = 0 to 3.0 v, p in = 0 dbm, characteristic impedance [zo] = 50 , unless otherwise noted) 0.70 0 C50 C45 C40 C35 C30 C25 C20 C15 C10 C5 0.75 0.80 0.85 0. 9 00. 9 5 1.00 frequency ( g hz) in s ertion lo ss (db) 0 a 271 a 85 6 a 14 6 5 a 0 v 1 v 2 v 3 v 3.1 v 3.2 v 3.3 v 3.4 v 1524 a 1585 a 1 6 4 6 a 1708 a figure 3. insertion loss vs frequency vs control voltage 0 + 6 0 +20 +25 +30 +35 +40 +45 +50 +55 0.5 1.0 1.5 2.0 2.5 3.5 3.0 c ontrol voltage (v) iip3 (dbm) 700 mhz 9 00 mhz 1100 mhz figure 5. iip3 vs control voltage vs frequency (spacing = 10 mhz) 0.70 0 C50 C45 C40 C35 C30 C25 C20 C15 C10 C5 0.75 0.80 0.85 0. 9 00. 9 5 1.00 frequency ( g hz) return lo ss (db) 0 v 1 v 2 v 3 v 3.1 v 3.2 v 3.3 v 3.4 v figure 4. return loss vs frequency vs control voltage 0 0 C40 C35 C45 C30 C25 C20 C15 C10 C5 200 400 6 00 800 1000 1200 1400 1 6 00 1800 c ontrol c urrent (ma) attenuation (db) 700 mhz 9 00 mhz 1100 mhz figure 6. attenuation vs control current vs frequency evaluation board description the sky12228-12lf evaluation board is used to test the performance of the sky12228-12lf 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. the attenuation level of the sky12228-12lf is controlled by applying 0 to 3 v to the v control pin on the evaluation board (see figure 7). package dimensions the pcb layout footprint for the sky12228-12lf 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. package and handling information 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 sky12228-12lf 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. 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.
data sheet ? sky12228-12lf: variable attenuator skyworks solutions, inc. ? phone [ 781] 376-3000 ? fax [781] 376-3100 ? sales@ skyworksinc.com ? www.skyworksinc.com 202500d ? skyworks proprietary and confiden tial information ? produc ts and product information ar e subject to change witho ut notice ? april 6, 2015 5 s3215 rf_in v c ontrol g nd rf_out figure 7. sky12228-12lf evaluation board assembly diagram s2531 c ro ss s ection n a me thickness (in) m a teri a l top s olderma s k l1 (0.0028) c u foil laminate 0.012 0.000 6 roger s ro4003 c c ore l2 (0.0014) c u foil laminate (note 1) fr4 prepreg l3 (0.0014) c u foil laminate 0.010 0.000 6 fr4 c ore l4 (0.0028) c u foil bottom s olderma s k note 1: adjust this thickness to meet total thickness goal of 0.062 ?0.005 inches. figure 8. layer detail physical characteristics
data sheet ? sky12228-12lf: variable attenuator skyworks solutions, inc. ? phone [ 781] 376-3000 ? fax [781] 376-3100 ? sales@ skyworksinc.com ? www.skyworksinc.com 6 april 6, 2015 ? skyworks prop rietary and confidential information ? produc ts and product informatio n are subject to chang e without notice ? 202500d s3219 i_ c ontrol g nd c ontrol voltage rf input rf output l1 100 nh l2 100 nh c 1 220 pf c 2 220 pf c 4 100 pf c 3 100 pf r1 1. 6 k g nd rf_in i_ c ontrol g nd g nd rf_out 1 2 3 4 8 7 6 5 figure 9. sky12228-12lf evaluation board schematic table 4. sky12228-12lf 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 100 nh 0402 coilcraft 0402cs-r10xjlu r1 1.6 k 0402 panasonic erj-2gej162x
data sheet ? sky12228-12lf: variable attenuator skyworks solutions, inc. ? phone [ 781] 376-3000 ? fax [781] 376-3100 ? sales@ skyworksinc.com ? www.skyworksinc.com 202500d ? skyworks proprietary and confiden tial information ? produc ts and product information ar e subject to change witho ut notice ? april 6, 2015 7 0.1630 0.0200 diam. via 4 places 0.0190 typ. 0.0555 typ. s3220 dimensions are in inches figure 10. sky12228-12lf pcb layout footprint pin 1 indicator s kywork s part # date c ode: (yy = c alendar year ww = week) figure 11. typical part markings (top view)
data sheet ? sky12228-12lf: variable attenuator skyworks solutions, inc. ? phone [ 781] 376-3000 ? fax [781] 376-3100 ? sales@ skyworksinc.com ? www.skyworksinc.com 8 april 6, 2015 ? skyworks prop rietary and confidential information ? produc ts and product informatio n are subject to chang e without notice ? 202500d s3217 dimensions are in inches (millimeters shown in parentheses) 0.04 9 (1.24 mm) 0.01 6 (0.41 mm) 0.01 6 max. (0.41 mm) x 45 c hamfer pin 1 0.1 9 7 (5.00 mm) 0.18 9 (4.80 mm) 0.0 6 8 (1.73 mm) max. 0.010 (0.25 mm) 0.004 (0.10 mm) 0.010 (0.25 mm) 0.007 (0.17 mm) 0.158 (4.00 mm) 0.150 (3.80 mm) 8 max. 0.020 (0.51 mm) max. 0.244 ( 6 .20 mm) 0.228 (5.80 mm) 0.050 (1.27 mm) b sc pin 8 pin 1 indicator figure 12. sky12228-12lf 8-pin so ic package dimensions ? 1.50 +0.25 8.00 0.10 6 .88 0.10 (ao) 2.00 0.05 4.00 0.10 12.00 0.30 C0.10 5.50 0.05 1.75 0.10 pin 1 ?1.55 0.05 5.4 9 0.10 (bo) 5 max b 8 max b a a 1. 6 8 0.10 (ko) 0.2 9 2 0.13 (t) 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 10 8 ohms/square per eia, jedec tnr speci?ation. 5. all dimensions are in millimeters. 6. part number us019881 (please indicate on purchase order). y1848 figure 13. sky12228-12lf tape and reel dimensions
data sheet ? sky12228-12lf: variable attenuator skyworks solutions, inc. ? phone [ 781] 376-3000 ? fax [781] 376-3100 ? sales@ skyworksinc.com ? www.skyworksinc.com 202500d ? skyworks proprietary and confiden tial information ? produc ts and product information ar e subject to change witho ut notice ? april 6, 2015 9 ordering information model name manufacturing part number evaluation board part number sky12228-12lf: variable attenuator sky12228-12lf SKY12228-12LF-EVB copyright ? 2012-2013, 2015 skyworks solutions, inc. all rights reserved. information in this document is provided in connection with skyw orks solutions, inc. (skyworks) products or services. these m aterials, including the information co ntained herein, are provided by skyworks as a service to its customers and may be used for info rmational purposes only by the cu stomer. skyworks assumes no res ponsibility for errors or omissions in these materials or the information contained herein. skyworks may change its documentat ion, products, services, specific ations or product descriptions at any time, without notice. skyworks makes no commitment to update the materials or information and shall have no responsi bility whatsoever for conflicts, incompatibilities, or other diff iculties arising from any future changes. no license, whether express, implied, by es toppel or otherwise, is granted to any in tellectual property rights by this document . skyworks assumes no liability for any materials, products or information provided hereunder, including the sale, distribution, re production or use of skyworks products, information or mate rials, except as may be provided in skyworks terms and conditions of sale. the materials, products and information are pr ovided as is without warranty of any ki nd, whether express, implied, statutory, or otherwise, including fitness for a particular purpose or use, merchantability, performance, qualit y or non-infringement of any intellectual property right; all su ch warranties are hereby expressly disclaimed. skyworks does not warrant the accura cy or completeness of the information, text, graphics or other items contained within these ma terials. skyworks shall not be liable for any damages, including but not limited to any special, indirect, incidental, statutory, or consequentia l damages, including without limitation, lost revenues or lost profits that may result from the use of the materials or information, wheth er or not the recipient of mat erials has been advised of the possibility of such damage. skyworks products are no t intended for use in medical, lifesaving or life-su staining applications, or other equipment in which the failure of the skyworks products could lead to personal injury, death, physical or environmental damage. skyw orks customers using or selli ng 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 us ing skyworks products , which may deviate from published specifi cations as a result of design de fects, errors, or operation of products outside of published pa rameters or design specifications. customers sh ould include design and operating safeguards to minimize these and other risks. skyworks assumes no liability for applications assistance, customer product de sign, or damage to any equipment resulting from the use of skyw orks products outsid e of stated published specifications or parameters. skyworks and the skyworks symbol are trademarks or registered trad emarks of skyworks solutions, inc., in the united states and other countries. third-party brands and names are for identification purposes only, and are the pr operty of their respective owners. additi onal information, including relevant terms and conditions, posted at www.skyw orksinc.com, are incorporated by reference.
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