skyworks solutions, inc. ? phone [781] 376 - 3000 ? fax [781] 376 - 3100 ? sales@skyworks inc.com ? www.skyworksinc.com 202281c ? skyworks proprietary information ? products and product informatio n are subject to change wi thout notice ? december 11 , 2012 1 data sheet sky12355 - 337lf : 0. 35- 4 .0 ghz two - bit digital attenuator applications ? cellular infrastructure ? wireless receivers features ? p ositive voltage operation with integrated decoder ? broadband operation: 0. 35 to 4.0 ghz ? attenuation: 18 db with 6 db lsb ? lo w insertion loss: 0.6 db @ 2 ghz ? absorptive in 50 systems ? small, qfn (12- pin, 3 x 3 mm) package (msl 1 , 260 c per jedec j - std - 020) figure 2. sky12355 - 337lf pinout C 12- pin qfn (top view) figure 1. sky12355 - 337lf block diagram description the sky12355 - 337lf is a gaas phemt two - bit digital attenua tor i/c. the device is provided in a 3 x 3 mm, 12- pin quad flat no - lead (qfn) package. the sky12355 - 337lf is particularly suited for low - cost commercial applications for which high attenuation accuracy, low insertion loss, and low intermodulation products are required. 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 ? sky12355 - 337lf two - bit digital attenuat or skyworks solutions, inc. ? phone [781] 376 - 3000 ? fax [781] 376 - 3100 ? sales@skyworks in c.com ? www.skyworksinc.com 2 december 11 , 2012 ? skyworks proprietary information ? products and product informatio n are subject to change without notice ? 202281c table 1. sky12355 - 337lf signal descriptions pin # nam e description pin # name description 1 gnd ground 7 n/c no connection required. may be connected to ground with no change in performance. 2 rf1 rf port. must be dc blocked. 8 rf2 rf port. must be dc blocked. 3 n/c no connection required. may be connecte d to ground with no change in performance. 9 gnd ground 4 n/c no connection required. may be connected to ground with no change in performance. 10 vctl2 dc control voltage. controls 12 db attenuation state. refer to table 4. 5 n/c no connection required. may be connected to ground with no change in performance. 11 vctl1 dc control voltage. controls 6 db attenuation state. refer to table 4. 6 n/c no connection required. may be connected to ground with no change in performance. 12 vdd dc power supply. not e : exposed pad must be grounded. table 2. sky12355 - 337lf absolute maximum ratings parameter symbol minimum typical maximum units supply voltage v dd 5.5 v control voltage vctl1, vctl2 v dd + 0.1 v rf input power @ 3 v p in +2 8 dbm operating temper ature t op C 40 +85 c storage temperature t stg C 65 +150 c note: exposure to maximum rating conditions for extended periods may reduce device reliability. there is no damage to device with o nly 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. attention: observe precautions for handling electrostatic sensitive devices esd human body model (hbm) = 250 v (class 1a ) esd machin e model (mm) = 100 v (class a ) esd charge d device model (cdm) = 1000 v (class 4 ) electrostatic discharge (esd) can damage this device, which must be protected from esd at all times. static charges may easily produce potentials of several kilovolts on the h uman body or equipment, which can discharge without detection. industry - standard esd precautions should be used at all times. functional description this attenuator has a least significant bit (lsb) of 6 db and a most significant bit (msb) of 12 db for a total of 18 db available attenuation. pins 10 and 11 (vctl2 and vctl1) control the state of the 6 db and 12 db attenuation bits, respectively. for each bit, a logic high enables the attenuation state while a logic low enables a low insertion loss state. electrical and mechanical specifications the absolute maximum ratings of the sky12355 - 337lf are provided in table 2 . e lectrical specifications are provided in table 3 . the state of the sky12355 - 337lf is determined by the logic provided in table 4 . the vc tl1 and vctl2 signals control the 6 db and 12 db attenuation bits, respectively. for each bit, a logic high enables the attenuation state, while a logic low enables the insertion loss state. typical performance characteristics are illustrated in figure s 3 to 6.
data sheet ? sky12355 - 337lf two - bit digital attenuat or skyworks solutions, inc. ? phone [781] 376 - 3000 ? fax [781] 376 - 31 00 ? sales@skyworks inc.com ? www.skyworksinc.com 202281c ? skyworks proprietary information ? products and product informatio n are subject to change without notice ? december 11 , 2012 3 table 3. sky12355 - 337lf electrical specifications (1 of 2) (note 1) ( v dd = 3 v, v ctl = 0 to 3 v, t op = +25 c, p in = 0 dbm, characteristic impedance [ z o ] = 50 8 , c1 & c2 = 1000 pf, unless otherwise noted) parameter symbol test condition min typical max units insertion loss il 350 to 500 mhz 500 mhz to 2 ghz 2 ghz to 3 ghz 3 ghz to 4 ghz 0. 4 5 0. 60 0.6 5 0. 7 5 0.80 0.80 0.90 1. 0 0 db db db db attenuation accuracy att @ 6 db: 350 mhz to 500 mhz 500 mhz to 2 ghz 2 ghz to 3 ghz 3 ghz to 4 ghz @ 12 db: 350 mhz to 500 mhz 500 mhz to 2 ghz 2 ghz to 3 ghz 3 ghz to 4 ghz @ 18 db: 350 mhz to 500 mhz 500 mhz to 2 ghz 2 ghz to 3 ghz 3 ghz to 4 ghz 5.7 6.0 6.1 6. 1 11.9 11.9 11.9 11.8 17.9 18.3 18.3 18.2 6.0 6. 3 6. 4 6. 4 12.2 12. 3 12. 2 12. 1 18.3 18. 7 18. 7 18.6 6.3 6.6 6.7 6.7 12.5 12.6 12.5 12.4 18.7 19.1 19.1 19.0 db db db db db db db db db db db db return loss |s 11 | 350 to 500 mhz 500 mhz to 2 ghz 2 gh z to 3 ghz 3 ghz to 4 ghz 10 14 1 2 1 2 20 22 19 19 db db db db switching characteristics: rise/fall time on/off time 1 0% rf to 90% rf or 90% rf to 10% rf 50% v ctl to 9 0% rf or 5 0 % v ctl to 10% rf 8 37 ns ns attenuation amplitude settling 500 ns to 5 ms 0.25 db phase settling (by design) 500 ns to 5 ms C 2 +2 deg 1 db input c ompression point i p1db v ctl = 3 v , 500 mhz to 4 ghz , insertion state +2 8 dbm 0.1 db input compression point ip0.1db v ctl = 3 v, 500 mhz to 4 ghz, all states + 1 9 dbm
data sheet ? sky12355 - 337lf two - bit digital attenuat or skyworks solutions, inc. ? phone [781] 376 - 3000 ? fax [781] 376 - 3100 ? sales@skyworks in c.com ? www.skyworksinc.com 4 december 11 , 2012 ? skyworks proprietary information ? products and product informatio n are subject to change without notice ? 202281c table 3. sky12355 - 337lf electrical specifications (2 of 2) (note 1) (v dd = 3 v, v ctl = 0 to 3 v, t op = +25 c, p in = 0 dbm, characteristic impedance [z o ] = 50 8 , c1 & c2 = 1000 pf, unless otherwise noted) parameter symbol test condition min typ ical max units 3 rd order input intercept point i i p3 tone spacing = 20 mhz, power / tone = +18 dbm , vdd = vctl1 = vctl2 = 3.3 v, 500 mhz to 4 ghz : i nsertion loss state a ll attenuation states +48 +44 + 50 +47 dbm dbm supply voltage v dd 3 5 v control voltage v dd v ctl = low v ctl = high 3 0 0.7 ? v dd 5 0.3 ? v dd v dd v v v control current v ctl = low and v ctl = high 10 a supply current i dd 20 50 a note 1: performance is guaranteed only under the conditions listed in this table. table 4. sky12355 - 337lf truth table state vdd vctl1 vctl2 insertion loss high low low 6 db high high low 12 db high low high 18 db hi gh high high note : high = 0.7 ? v dd to v dd low = 0 to 0.3 ? v dd any state other than described in this table places the attenuator into an undefined state.
data sheet ? sky12355 - 337lf two - bit digital attenuat or skyworks solutions, inc. ? phone [781] 376 - 3000 ? fax [781] 376 - 31 00 ? sales@skyworks inc.com ? www.skyworksinc.com 202281c ? skyworks proprietary information ? products and product informatio n are subject to change without notice ? december 11 , 2012 5 typical performance characteristics (v dd = 3 v, v ctl = 0 to 3 v, t op = +25 c, p in = 0 dbm, char acteristic impedance [z o ] = 50 8 , c1 & c2 = 1000 pf, unless otherwise noted) figure 3. insertion loss vs frequency figure 5. attenuation error vs frequency (normalized to insertion loss) figure 4. attenuation vs frequency (normalized to insertion loss) figure 6. return loss vs frequency
data sheet ? sky12355 - 337lf two - bit digital attenuat or skyworks solutions, inc. ? phone [781] 376 - 3000 ? fax [781] 376 - 3100 ? sales@skyworks in c.com ? www.skyworksinc.com 6 december 11 , 2012 ? skyworks proprietary information ? products and product informatio n are subject to change without notice ? 202281c evaluation board description the sky12355 - 3 3 7lf evaluation board is used to test the performance of the sky12355 - 3 3 7lf digital attenuator. a n evaluation board schematic diagram is shown in figure 7 . table 5 provides the bill of materials ( bom) list for evaluation board components. an assembly drawing for the evaluation board is shown in figure 8. package dimensions the pcb layout footprint for the sky12355 - 337lf is shown in figure 9 . typical case markings are noted in figure 10. package dim ensions for the 12- pin qfn are shown in figure 11 , and tape and reel dimensions are provided in figure 12. package and handling information instructions on the shipping container label regarding exposure to moisture after the container seal is broken mus t be followed. otherwise, problems related to moisture absorption may occur when the part is subjected to high temperature during solder assembly. t he sky12355 - 337lf is rated to moisture sensitivity level 1 (msl 1 ) at 260 c. it can be used f or 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. sky12355 - 337lf evaluation board schematic diagram table 5. sky12355 - 337lf evaluation board bill of materials component value size manufacturer/part serie s c1, c2 1000 pf 0402 murata grm series note : blocking capacitors are required on both rf ports for proper functionality. value of dc blocking capacitor determines lower f requency operation.
data sheet ? sky12355 - 337lf two - bit digital attenuat or skyworks solutions, inc. ? phone [781] 376 - 3000 ? fax [781] 376 - 31 00 ? sales@skyworks inc.com ? www.skyworksinc.com 202281c ? skyworks proprietary information ? products and product informatio n are subject to change without notice ? december 11 , 2012 7 figure 8. sky12355 - 33 7lf evaluation board assembly diagra m figure 9. sky12355 - 337lf pcb layout footprint
data sheet ? sky12355 - 337lf two - bit digital attenuat or skyworks solutions, inc. ? phone [781] 376 - 3000 ? fax [781] 376 - 3100 ? sales@skyworks in c.com ? www.skyworksinc.com 8 december 11 , 2012 ? skyworks proprietary information ? products and product informatio n are subject to change without notice ? 202281c figure 10 . typical part markings figure 11. sky12355 - 337lf 12- pin qfn package dimensions
data sheet ? sky12355 - 337lf two - bit digital attenuat or skyworks solutions, inc. ? phone [781] 376 - 3000 ? fax [781] 376 - 31 00 ? sales@skyworks inc.com ? www.skyworksinc.com 202281c ? skyworks proprietary information ? products and product informatio n are subject to change without notice ? december 11 , 2012 9 figure 12. sky12355 - 337lf tape and reel dimensions
data sheet ? sky12355 - 337lf two - bit digital attenuat or skyworks solutions, inc. ? phone [781] 376 - 3000 ? fax [781] 376 - 3100 ? sales@skyworks in c.com ? www.skyworksinc.com 10 december 11 , 2012 ? skyworks proprietary information ? products and product informatio n are subject to change without notice ? 202281c ordering information model name manufacturing part n umber evaluation board part number s sky12355 - 337lf digital attenuator sky12355 - 337lf sky12355 - 337lf - evb copyright ? 2 012 skyworks solutions, inc. all rights reserved. information in this document is provided in connection with skywo rks solutions, inc. (skyworks) products or services. these materials, including the information contained herein, are provi ded 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 descriptio ns at any time, without notice. skyworks makes no commitment to up date the materials or information and shall have no responsibility whatsoever for conflicts, incompatibilities, or other diff iculties arising from any future changes. no license, whether express, implied, by estoppel or otherwise, is granted to any intelle ctual 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 ma terials, except as may be prov ided in skyworks terms and conditions of sale. the materials, products and information are provided as is without warranty of any kind, whether express, implied, statutor y, or otherwise, including fitness for a particular purpose or use, merchantability, performance, quality or non - infringement of any intellectual property right; all such warranties are hereby expressly disclaimed. skyworks does not warrant the accuracy or completeness of the information, text, graphics or other items containe d within the se materials. skyworks shall not be liable for any damages, including but not limited to any special, indirect, incidental, statutory, or consequent ial damages, including without limitation, lost revenues or lost profits that may result from the use of the materials or information, whether or not the recipient of materials has been advised of the possibility of such damage. skyworks products are not intended for use in medical, lifesaving or life - sustaining applications, or other equipment in which the fail ure 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 d o so at their own risk and agree to fully indemnify skyworks for any da mages resulting from such improper use or sale. customers are responsible for their products and applications using skyworks products, which may deviate from published speci fications as a result of design defects, errors, or operation of products outside o f published parameters or design specifications. customers should include design and operating safeguards to minimize these a nd other risks. skyworks assumes no liability for applications assistance, customer product design, or damage to any equipmen t resulting from the use of skyworks products outside of stated published specifications or parameters. skyworks, the skyworks symbol, and breakthrough simplicity are trademarks or registered trademarks of skyworks solutions, i nc., in the united states a nd other countries. third - party brands and names are for identification purposes only, and are the property of their respective owners. additional information, incl uding relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by refe rence.
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