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active rf splitter ada4302-4 rev. b information furnished by analog devices is believed to be accurate and reliable. however, no responsibility is assumed by analog devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. specifications subject to change without notice. no license is granted by implication or otherwise under any patent or patent rights of analog devices. trademarks and registered trademarks are the property of their respective owners. one technology way, p.o. box 9106, norwood, ma 02062-9106, u.s.a. tel: 781.329.4700 www.analog.com fax: 781.461.3113 ? 2005 analog devices, inc. all rights reserved. features single 5 v supply 54 mhz to 865 mhz catv operating range 4.6 db of gain per output channel 4.4 db noise figure 25 db isolation between output channels ?16 db input return loss cso of ?73 dbc (135 channels, 15 dbmv per tone) ctb of ?66 dbc (135 channels, 15 dbmv per tone) 1.3 ghz, ?3 db bandwidth applications cable set-top boxes home gateways catv distribution systems cable splitter modules general description the ada4302-4 is used as an active element in applications where a lossless signal split is required. typical applications include multituner cable set-top boxes, cable splitter modules, multituner televisions, and home gateways where traditional solutions have consisted of discrete passive splitters followed by separate fixed gain amplifiers. the ada4302-4 is a low cost alternative solution that simplifies designs and improves system performance by integrating a signal splitter element and gain element into a single ic solution. the ada4302-4 features four differential outputs. the differential architecture allows systems designed with the ada4302-4 to maintain excellent linearity throughout the catv band. the ada4302-4 can also be configured for applications that require fewer than four outputs. outputs can be configured independently from one another. functional block diagram splitter vin ilp vip iln gnd gnd j1 gnd vcc vcc + vcc vop4 von3 vop3 von2 vop2 von1 vop1 05017-016 von4 figure 1. frequency (mhz) cso (dbc) ?55 ?85 50 1000 05017-008 ?70 100 ?60 ?65 ?75 ?80 t a = +85 c t a = ?40 c t a = +25 c figure 2. composite second-order (cso) vs. frequency
ada4302-4 rev. b | page 2 of 12 table of contents features .............................................................................................. 1 applications ....................................................................................... 1 general description ......................................................................... 1 functional block diagram .............................................................. 1 revision history ............................................................................... 2 specifications ..................................................................................... 3 absolute maximum ratings ............................................................ 4 esd caution .................................................................................. 4 pin configuration and function descriptions ............................. 5 typical performance characteristics ..............................................6 applications ........................................................................................8 circuit description .......................................................................8 evaluation boards .........................................................................8 rf layout considerations ............................................................8 power supply ..................................................................................8 outline dimensions ....................................................................... 11 ordering guide .......................................................................... 11 revision history 9/05rev. spa to rev. b updated format..................................................................universal changes to circuit description section ........................................ 8 5/05rev. sp0 to rev. spa changes to format .............................................................universal changes to features.......................................................................... 1 changes to figure 1 and figure 2................................................... 1 changes to table 1............................................................................ 3 changes to figure 4 and figure 5................................................... 6 changes to applications section .................................................... 8 10/04revision sp0: initial version
ada4302-4 rev. b | page 3 of 12 specifications v cc = 5 v, r in = r l = 75 , t a = 25c, unless otherwise noted. the ada4302-4 is characterized using a balun 1 at the input. table 1. parameter conditions min typ max unit dynamic performance bandwidth (?3 db) 1300 mhz specified frequency range 54 865 mhz gain (s21) f = 100 mhz 3.5 4.6 5.7 db gain flatness f = 865 mhz 1 db noise/distortion performance composite triple beat (ctb) 135 channels, 15 dbmv/channel, f = 103.25 mhz ?66 ?62 dbc composite second-order (cso) 135 channels, 15 dbmv/channel, f = 103.25 mhz ?73 ?67 dbc cross modulation (cxm) 135 channels, 15 dbmv/channel, 100% modulation @ 15.75 khz, f = 103.25 mhz ?67 ?64 dbc output ip3 f 1 = 97.25 mhz, f 2 = 103.25 mhz 23 dbm output ip2 f 1 = 97.25 mhz, f 2 = 103.25 mhz 65 dbm noise figure @ 54 mhz 4.1 4.4 db @ 550 mhz 4.4 4.7 db @ 865 mhz 5.0 5.8 db input characteristics input return loss (s11) referenced to 75 @ 54 mhz ?16 ?14 db @ 550 mhz ?16 ?11 db @ 865 mhz ?18 ?11 db output-to-input isolation (s12) any outp ut, 54 mhz to 865 mhz ?35 ?33 db output characteristics output return loss (s22) referenced to 75 @ 54 mhz ?11 ?9 db @ 550 mhz ?12.5 ?10 db @ 865 mhz ?14 ?11.5 db output-to-output isolation between any two outputs, 54 mhz to 865 mhz ?25 db 1 db compression output referred, f = 100 mhz 8 dbm power supply nominal supply voltage 5 v quiescent supply current 215 240 ma 1 m/a-com mabaes0029.
ada4302-4 rev. b | page 4 of 12 absolute maximum ratings table 2. parameter rating supply voltage 5.5 v storage temperature range ?65c to +125c operating temperature range ?40c to +85c lead temperature (soldering 10 sec) 300c junction temperature 150c stresses above those listed under absolute maximum rating may cause permanent damage to the device. this is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. esd caution esd (electrostatic discharge) sensitive device. electr ostatic charges as high as 4000 v readily accumulate on the human body and test equipment and can discharge without detection. although this product features proprietary esd protection circuitry, permanent dama ge may occur on devices subjected to high energy electrostatic discharges. therefore, proper esd precautions are recommended to avoid performance degradation or loss of functionality.
ada4302-4 rev. b | page 5 of 12 pin configuration and fu nction descriptions pin 1 indicator 1vop4 2 v on4 3vcc 4vcc 5iln 13 vcc 14 vop3 15 von3 12 vcc 11 ilp 6 g n d 7 v i p 8 g n d c 1 0 g n d 9 v i n 1 8 g n d 1 9 v o p 1 2 0 v o n 1 1 7 v o n 2 1 6 v o p 2 top view (not to scale) ada4302-4 05017-001 figure 3. 20-lead lfcsp_vq pin configuration table 3. pin function descriptions pin o. mneonic description 1 vop4 positive output 4 2 von4 negative output 4 3, 4, 12, 13 vcc supply pin 5 iln bias pin 6, 10, 18 gnd ground 7 vip positive input 8 gndc ground 9 vin negative input 11 ilp bias pin 14 vop3 positive output 3 15 von3 negative output 3 16 vop2 positive output 2 17 von2 negative output 2 19 vop1 positive output 1 20 von1 negative output 1
ada4302-4 rev. b | page 6 of 12 typical performance characteristics frequency (mhz) cso (dbc) ?55 ?85 50 1000 05017-008 ?70 100 ?60 ?65 ?75 ?80 t a = +85 c t a = ?40 c t a = +25 c figure 4. composite second-order (cso) vs. frequency frequency (mhz) ctb (dbc) ?55 ?75 50 1000 05017-009 100 ?60 ?65 ?70 t a = +25 c t a = +85 c t a = ?40 c figure 5. composite triple beat (ctb) vs. frequency frequency (mhz) cxm (dbc) ?55 ?60 ?70 ?65 ?75 50 100 1000 05017-010 t a = ?40 c t a = +85 c t a = +25 c figure 6. cross modulation (cxm) vs. frequency frequency (mhz) noise figure (db) 7 6 5 4 3 2 50 100 1000 05017-006 t a = +85 c t a = +25 c t a = ?40 c figure 7. noise figure vs. frequency frequency (mhz) output ip2 (dbm) 90 70 80 40 50 60 30 50 100 1000 05017-012 figure 8. output ip2 vs. frequency frequency (mhz) output ip3 (dbm) 25 20 5 10 15 0 50 100 1000 05017-013 figure 9. output ip3 vs. frequency
ada4302-4 rev. b | page 7 of 12 frequency (mhz) gain (db) 10 5 0 ?5 ?10 ?15 ?20 50 100 10000 1000 05017-003 t a = +85 c t a = +25 c t a = ?40 c figure 10. ac response (s21) frequency (mhz) isolation (db) 0 ?10 ?20 ?30 ?40 ?50 50 100 1000 05017-005 figure 11. output-to-input is olation vs. frequency (s12) frequency (mhz) isolation (db) 0 ?10 ?5 ?15 ?20 ?25 ?30 ?35 50 100 1000 05017-007 figure 12. output-to-output isolation vs. frequency frequency (mhz) input return loss (db) 0 ?5 ?10 ?15 ?20 ?25 50 100 1000 05017-002 figure 13. input return loss vs. frequency (s11) frequency (mhz) output return loss (db) 0 ?5 ?10 ?15 ?20 ?25 50 100 1000 05017-004 figure 14. output return loss vs. frequency (s22) temperature ( c) quiescent supply current (ma) 240 235 210 205 220 215 225 230 200 ?60 ?40 ?20 0 20 40 60 80 100 05017-011 figure 15. quiescent supply current vs. temperature
ada4302-4 rev. b | page 8 of 12 applications the ada4302-4 active splitter is primarily intended for use in the downstream path of television set-top boxes (stbs) that contain multiple tuners. it is located directly after the diplexer in a catv customer premise unit. the ada4302-4 provides a differential input and four differential outputs that allow the delivery of the rf signal to up to four different signal paths. these paths can include, but are not limited to, a main picture tuner, the picture-in-picture (pip) tuner, a digital video recorder (dvr), and a cable modem (cm). the differential nature of the ada4302-4 allows it to provide composite second-order (cso) and composite triple beat (ctb) products that are ?73 dbc and ?66 dbc, respectively. the use of the sige process also allows the ada4302-4 to achieve a noise figure (nf) that is less than 5 db. circuit description the ada4302-4 has a low noise buffer amplifier that is followed by four parallel amplifiers. this arrangement provides 4.6 db of gain relative to the rf signal present at the differential inputs of the active splitter. the input and each output must be properly matched to a differential 75 environment in order for distortion and noise performance to match the data sheet specifications. if needed, baluns to convert to single-ended operation can be used. the m/a-com mabaes0029 is recommended for the input balun and the mini-circuit? tc1-1-13m-2 is recommended for the output balun. ac coupling capacitors of 0.01 f are recommended for all inputs and outputs. two 1 h rf chokes, l1 and l2 (coilcraft chip inductor 0805ls-102x), are used to correctly bias internal nodes of the ada4302-4 by connecting them between the 5 v supply and iln and ilp, respectively. evaluation boards there are two evaluation boards for the ada4302-4, a single- ended output board (ada4302-4 ebse) and a differential output board (ada4302-4 ebdi). the single-ended output board has an input balun that converts a signal from a single- ended source to a differential signal. the differential output board uses the same input balun and allows the output signals to run directly to the board connectors. this allows the differential signals at the ada4302-4s outputs to be applied directly to a tuner with differential inputs. the schematics for these evaluation boards can be seen in figure 16 and figure 17 , respectively. each board has place holders to properly terminate the unused outputs, if needed. on the single-ended output board, they are designated r15 through r18, and 75 resistors should be used here (see figure 16 ). on the differential output board, 37.5 resistors should be used for r1, r2, and r4 through r9 when their respective outputs are not in use (see figure 17 ). rf layout considerations appropriate impedance matching techniques are mandatory when designing a circuit board for the ada4302-4. improper characteristic impedances on traces can cause reflections that can lead to poor linearity. if the stage following the ada4302-4 is a single-ended load with a 75 impedance, then a balun should be used. the characteristic impedance of the signal trace from each output of a differential pair to the output balun should be 37.5 . in the case of the differential output evaluation board, the output traces should also have a characteristic impedance of 37.5 . power supply the 5 v supply should be applied to each of the vcc pins and rf chokes via a low impedance power bus. the power bus should be decoupled to ground using a 10 f tantalum capacitor and a 0.01 f ceramic chip capacitor located close to the ada4302-4. in addition, the vcc pins should be decoupled to ground with a 0.01 f ceramic chip capacitor located as close to each of the pins as possible. pin 3 and pin 4 can share one capacitor, and pin 12 and pin 13 can share one capacitor.
ada4302-4 rev. b | page 9 of 12 dut splitter 9 11 7 1 3 5 t5 4 5 vin ilp vip iln 6 gnd gnd agnd agnd agnd agnd j1 agnd vcc vcc gnd gndc 10 18 8 19 von1 vop1 vop2 von2 20 16 17 g4 g3 vcc g2 g1 agnd 13 vcc vcc vcc vcc 12 4 3 2 vop4 von4 von3 vop3 1 15 14 c10 0.01 f l1 1 h 37.5 traces 37.5 traces 75 trace 75 trace 75 trace 75 trace 75 trace 75 trace p4 75 trace c13 10 f c14 0.01 f agnd c19 0.01 f + c3 0.01 f c1 0.01 f r15 dni c11 0.01 f vcc l2 1 h r3 dni 4 5 3 1 c2 0.01 f 05017-015 agnd r2 dni 37.5 traces 75 trace t2 t3 t4 t1 p3 agnd c5 0.01 f r16 dni 4 5 3 1 c4 0.01 f agnd r6 dni 37.5 traces 75 trace p2 agnd c9 0.01 f r17 dni 4 5 3 1 c8 0.01 f agnd r8 dni 37.5 traces 75 trace p1 agnd c6 0.01 f r18 dni 4 5 3 1 c7 0.01 f agnd r10 dni figure 16. single-ended output evaluation board table 4. ada4302-4acpz-ebse bill of materials (bom) uantit description reference 2 coilcraft 0805ls-102x chip inductor l1, l2 4 mini-circuit tc1-1-13m-2 transformer t1 to t4 1 m/a-com mabaes0029 transformer t5 13 mlcc, 0.01 f, c402 c1 to c11, c14, c19 1 tantalum, 10 f, b size c13 1 ada4302-4acpz dut 5 sma connectors j1, p1 to p4 9 impedance matching resistors, insert as needed r2, r3, r6, r8, r10, r15 to r18
ada4302-4 rev. b | page 10 of 12 dut splitter 9 11 7 1 3 5 t5 4 5 vin ilp vip iln 6 gnd gnd agnd agnd agnd j1 agnd agnd vcc vcc gnd gndc 10 18 8 19 von1 vop1 vop2 von2 20 16 17 g4 g3 vcc g2 g1 agnd 13 vcc vcc vcc vcc 12 4 3 2 vop4 von4 von3 vop3 1 15 14 c10 0.01 f l1 1 h 37.5 traces 37.5 traces 37.5 traces 37.5 traces 37.5 traces 37.5 traces 37.5 traces 37.5 traces 37.5 traces 75 trace 75 trace c13 10 f c14 0.01 f c19 0.01 f + c3 0.01 f c1 0.01 f r8 dni r9 dni c11 0.01 f vcc l2 1 h p4vdp c2 0.01 f agnd p3vdn c5 0.01 f r1 dni r2 dni p3vdp c4 0.01 f agnd p2vdn c9 0.01 f r4 dni r5 dni p2vdp c8 0.01 f agnd p1vdn c6 0.01 f r7 dni r6 dni p1vdp c7 0.01 f 05017-014 p4vdn figure 17. differential output evaluation board table 5. ada4302-4acpz-ebdi bill of materials (bom) uantit description reference 2 coilcraft 0805ls-102x chip inductor l1, l2 1 m/a-com mabaes0029 transformer t5 13 mlcc, 0.01 f, c402 c1 to c11, c14, c19 1 tantalum, 10 f, b size c13 1 ada4302-4acpz dut 9 sma connectors j1, p1vdn to p4vdn, p1vdp to p4vdp 8 impedance matching resistors, insert as needed r1, r2, r4 to r9
ada4302-4 rev. b | page 11 of 12 outline dimensions 1 20 5 6 11 16 15 10 2.25 2.10 sq 1.95 0.75 0.55 0.35 0.30 0.23 0.18 0.50 bsc 12 max 0.20 ref 0.80 max 0.65 typ 0.05 max 0.02 nom 1.00 0.85 0.80 seating plane pin 1 indicato r top view 3.75 bcs sq 4.00 bsc sq coplanarity 0.08 0.60 max 0.60 max 0.25 min compliant to jedec standards mo-220-vggd-1 pin 1 indicator figure 18. 20-lead lead frame chip scale package [lfcsp_vq] 4 mm 4 mm body, very thin quad (cp-20-1) dimensions shown in millimeters ordering guide model ordering quantity temperature ra nge package description package option ada4302-4acp-reel 5,000 ?40c to +85c 20-lead lfcsp_vq cp-20-1 ada4302-4acp-rl7 1,500 ?40c to +85c 20-lead lfcsp_vq cp-20-1 ADA4302-4ACPZ-RL 1 5,000 ?40c to +85c 20-lead lfcsp_vq cp-20-1 ADA4302-4ACPZ-RL7 1 1,500 ?40c to +85c 20-lead lfcsp_vq cp-20-1 ada4302-4acpz-r2 1 250 ?40c to +85c 20-lead lfcsp_vq cp-20-1 ada4302-4acpz-ebse 2 1 single-ended evaluation board ada4302-4acpz-ebdi 2 1 differential output evaluation board 1 z = pb-free part. 2 evaluation board contains pb-free part.
ada4302-4 rev. b | page 12 of 12 t notes ? 2005 analog devices, inc. all rights reserved. trademarks and registered trademarks are the property of their respective owners. d05017C0C9/05(b) ttt

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