View ADA4303-2ACPZ-EB_3034251.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

1:2 single-ended, low cost active rf splitter ada4303-2 rev. 0 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 ?2006 analog devices, inc. all rights reserved. features ideal for catv applications excellent frequency response 1.7 ghz, ?3 db bandwidth 1 db flatness to 1.2 ghz low noise figure: 4.4 db low distortion composite second order (cso): ?62 dbc composite triple beat (ctb): ?72 dbc 1 db compression point of 8.5 dbm 3 db of gain per output channel 24 db isolation between output channels 75 input and outputs small package size 12-lead, 3 mm 3 mm lead frame chip scale package applications set-top boxes home gateways catv distribution systems functional block diagram vin vo2 vo1 gnd vcc 0.01f il 1h 5 v 5 v ada4303-2 249 ? 249? 0.01f 0.01f 0.1f 0.1f 06364-001 figure 1. splitter modules digital cable ready (dcr) tvs general description the ada4303-2 is a 75 , two-output active splitter for use in applications where a lossless signal split is required. typical applications include multituner digital set-top boxes, cable splitter modules, multituner/digital cable ready (dcr) televisions, and home gateways where traditional solutions require discrete passive splitter modules with separate fixed gain amplifiers. the ada4303-2 is a low cost alternative that simplifies designs and improves system performance by integrating a signal splitter element and a gain block into a single ic. the ada4303-2 is available in a 12-lead chip scale package (lfcsp_vq) and operates in the extended industrial temperature range of ?40c to +85c. 4 3 2 1 0 ?1 ?2 ?3 ?4 ?5 ?6 ?7 ?8 50 100 4000 1000 gain (db) frequency (mhz) t a = +85c t a = +25c t a = ?40c 06364-010 figure 2. gain (s21) vs. frequency
ada4303-2 rev. 0 | page 2 of 12 table of contents features .............................................................................................. 1 applications....................................................................................... 1 functional block diagram .............................................................. 1 general description ......................................................................... 1 revision history ............................................................................... 2 specifications..................................................................................... 3 absolute maximum ratings............................................................ 4 thermal resistance ...................................................................... 4 esd caution.................................................................................. 4 pin configuration and function descriptions..............................5 typical performance characteristics ..............................................6 applications........................................................................................8 circuit description .......................................................................8 evaluation board ......................................................................... ..8 rf layout considerations............................................................8 power supply..................................................................................8 outline dimensions ..........................................................................9 ordering guide .............................................................................9 revision history 10/06revision 0: initial version
ada4303-2 rev. 0 | page 3 of 12 specifications v cc = 5 v, r in = r l = 75 , t a = 25c, unless otherwise noted. table 1. parameter conditions min typ max unit dynamic performance bandwidth (?3 db) 1700 mhz specified frequency range 54 865 mhz gain (s21) f = 100 mhz 2.0 3.0 4.0 db 1 db gain flatness 1200 mhz noise/distortion performance noise figure @ 54 mhz 4.0 4.3 db @ 550 mhz 4.3 4.9 db @ 865 mhz 4.4 5.1 db output ip3 f 1 = 97.25 mhz, f 2 = 103.25 mhz 26.5 dbm output ip2 f 1 = 97.25 mhz, f 2 = 103.25 mhz 44.0 dbm composite triple beat (ctb) 135 channels, 15 dbmv/channel, f = 865 mhz ?72 ?66 dbc composite second-order (cso) 135 channels, 15 dbmv/channel, f = 865 mhz ?62 ?60 dbc cross modulation (cxm) 135 channels, 15 dbmv/channel, 100% modulation @ 15.75 khz, f = 865 mhz ?68 ?65 dbc input characteristics input return loss (s11) referenced to 75 @ 54 mhz ?15.0 ?11.5 db @ 550 mhz ?19.5 ?14.0 db @ 865 mhz ?12.0 ?7.5 db output-to-input isolation (s12) an y output, 54 mhz to 865 mhz @ 54 mhz ?31.8 ?29.0 db @ 550 mhz ?32.0 ?29.5 db @ 865 mhz ?32.5 ?30.0 db output characteristics output return loss (s22) referenced to 75 @ 54 mhz ?31.2 ?23.0 db @ 550 mhz ?19.4 ?14.0 db @ 865 mhz ?15.5 ?11.0 db output-to-output isolation between any two outputs, 54 mhz to 865 mhz @ 54 mhz ?24.6 db @ 550 mhz ?24.0 db @ 865 mhz ?24.5 db 1 db compression output referred, f = 100 mhz 8.5 dbm power supply nominal supply voltage 4.5 5.0 5.5 v quiescent supply current 78 90 ma
ada4303-2 rev. 0 | page 4 of 12 absolute maximum ratings table 2. parameter rating supply voltage 5.5 v power dissipation see figure 3 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. thermal resistance ja is specified for the worst-case conditions; that is, ja is specified for a device (including exposed pad) soldered to the circuit board. table 3. thermal resistance package type ja unit 12-lead lfcsp_vq (exposed pad) 99.2 c/w maximum power dissipation the maximum safe power dissipation in the ada4303-2 package is limited by the associated rise in junction temperature (t j ) on the die. at approximately 150c, which is the glass transition temperature, the plastic changes its properties. even temporarily exceeding this temperature limit can change the stresses that the package exerts on the die, permanently shifting the parametric performance of the ada4303-2. exceeding a junction temperature of 150c for an extended period can result in changes in the silicon devices, potentially causing failure. the power dissipated in the package (p d ) is the sum of the quiescent power dissipation and the power dissipated in the package due to the load drive. the quiescent power is the voltage between the supply pins (v s ) times the quiescent current (i s ). the power dissipated due to the load drive depends upon the particular application. the power due to load drive is calculated by multiplying the load current by the associated voltage drop across the device. rms voltages and currents must be used in these calculations. airflow increases heat dissipation, effectively reducing ja . in addition, more metal directly in contact with the package leads/exposed pad from metal traces, through-holes, ground, and power planes reduces the ja . figure 3 shows the maximum safe power dissipation in the package vs. the ambient temperature for the 12-lead lfcsp_vq (99.2c/w) on a jedec standard 4-layer board. 0 ?40 ?20 maximum power dissipation (w) ambient temperature (c) 06364-016 0.5 1.0 2.0 1.5 2.5 ?60 0 20 40 60 80 100 120 figure 3. maximum power dissipation vs. temperature for a 4-layer board esd caution
ada4303-2 rev. 0 | page 5 of 12 pin configuration and fu nction descriptions pin 1 indicator nc = no connect 1 vcc 2 vin 3 gnd 9vo1 8vo2 7gnd 4 g n d 5 g n d 6 n c 1 2 v c c 1 1 i l 1 0 n c ada4303-2 top view 06364-002 figure 4. pin configuration table 4. pin function descriptions pin no. mnemonic description 1 vcc supply pin 2 vin input 3 gnd ground 4 gnd ground 5 gnd ground 6 nc no connection 7 gnd ground 8 vo2 output 2 9 vo1 output 1 10 nc no connection 11 il bias pin 12 vcc supply pin
ada4303-2 rev. 0 | page 6 of 12 typical performance characteristics ? 50 ?53 ?56 ?59 ?62 ?65 ?68 ?71 ?74 ?77 ?80 50 100 1000 cso (dbc) frequency (mhz) t a = +25c t a = +85c t a = ?40c 06364-004 figure 5. composite second-order (cso) vs. frequency ? 60 ?63 ?66 ?69 ?72 ?75 ?78 ?81 ?84 ?87 ?90 50 100 1000 ctb (dbc) frequency (mhz) t a = +25c t a = ?40c 06364-005 t a = +85c figure 6. composite triple beat (ctb) vs. frequency ? 60 ?63 ?66 ?69 ?72 ?75 ?78 ?81 ?84 ?87 ?90 50 100 1000 cxm (dbc) frequency (mhz) t a = +25c t a = +85c t a = ?40c 06364-006 figure 7. cross modulation (cxm) vs. frequency 10 2 4 6 8 0 50 100 1000 noise figure (db) frequency (mhz) t a = +25c t a = +85c t a = ?40c 06364-007 figure 8. noise figure vs. frequency 60 55 50 45 40 35 30 25 20 50 100 1000 output ip2 (dbm) frequency (mhz) 06364-008 figure 9. output ip2 vs. frequency 40 35 30 25 20 15 10 5 0 50 100 1000 output ip3 (dbm) frequency (mhz) 06364-009 figure 10. output ip3 vs. frequency
ada4303-2 rev. 0 | page 7 of 12 4 3 2 1 0 ?1 ?2 ?3 ?4 ?5 ?6 ?7 ?8 50 100 4000 1000 gain (db) frequency (mhz) t a = +85c t a = +25c t a = ?40c 06364-010 figure 11. gain (s21) vs. frequency ? 30 ?31 ?32 ?33 ?34 ?35 ?36 ?37 ?38 ?39 ?40 50 100 4000 1000 isolation (db) frequency (mhz) 06364-011 figure 12. output-to-input is olation (s12) vs. frequency 0 ?5 ?10 ?15 ?20 ?25 ?30 ?35 ?40 ?45 50 100 4000 1000 isolation (db) frequency (mhz) 06364-012 figure 13. output-to-output isolation vs. frequency 0 ?5 ?10 ?15 ?20 ?25 ?30 50 100 1000 input return loss (db) frequency (mhz) 06364-013 figure 14. input return loss (s11) vs. frequency 0 ?10 ?20 ?5 ?15 ?25 ?30 ?35 ?40 50 100 1000 output return loss (db) frequency (mhz) 06364-014 figure 15. output return loss (s22) vs. frequency 90 65 70 75 80 85 ?40 ?30 ?20 ?10 0 10 20 30 40 50 60 70 80 quiescent supply current (ma) temperature (c) 06364-015 ?60 ?50 90 100 figure 16. quiescent supply current vs. temperature
ada4303-2 rev. 0 | page 8 of 12 applications the ada4303-2 active splitter is primarily intended for use in the downstream path of television set-top boxes (stbs) that contain multiple tuners. it is typically located directly after the diplexer in a catv customer premise unit. the ada4303-2 provides a single-ended input and two single-ended outputs that allow the delivery of the rf signal to two different signal paths. these paths can include, but are not limited to, a main picture tuner, a picture-in-picture (pip) tuner, an out-of-band (oob) tuner, a digital video recorder (dvr), and a cable modem (cm). the ada4303-2 exhibits composite second-order (cso) and composite triple beat (ctb) products that are ?62 dbc and ?72 dbc, respectively. the use of the sige process also allows the ada4303-2 to achieve a noise figure (nf) of less than 4.5 db. circuit description the ada4303-2 consists of a low noise buffer amplifier followed by a resistive power divider. this arrangement provides 3 db of gain relative to the rf signal present at the input of the device. the input and each output must be properly matched to a 75 environment for distortion and noise performance to match the data sheet specifications. in addition, to achieve the specified gain, a 1% 249 resistor should be installed to ground on each output. ac coupling capacitors of 0.01 f are recommended for the input and outputs. a 1 h rf choke (coilcraft chip inductor 0805ls-102x) is required to correctly bias internal nodes of the ada4303-2. it should be connected between the 5 v supply and il (pin 11). evaluation board the ada4303-2 evaluation board allows designers to assess the performance of the part in their particular applications. the board includes 75 coaxial connectors and 75 controlled-impedance signal traces that carry the input and output signals. power (5 v) is applied to the red vcc loop connector, and ground is connected to the black gnd loop connector. the board has two 249 resistor s between each output and ground that set the gain of the overall circuit to 3 db and improve output-to-output isolation. a schematic of the ada4303-2 evaluation board is shown in figure 17 . rf layout considerations appropriate impedance matching techniques are mandatory when designing a circuit board for the ada4303-2. improper characteristic impedances on traces can cause reflections that can lead to poor linearity. the characteristic impedance of the signal trace from each output should be 75 . power supply the 5 v supply should be applied to each of the vcc pins and rf choke via a low impedance power bus. the power bus should be decoupled to ground using a 10 f tantalum capacitor and a 0.1 f ceramic chip capacitor located close to the ada4303-2. in addition, the vcc pins should be decoupled to ground with a 0.1 f ceramic chip capacitor located as close to each of the pins as possible. 1 ada4303-2 c3 0.01 f 249 ? l1 1.0 h v c c gnd vcc vin 2 3 45 7 9 6 8 10 1112 j3 j2 j1 gnd gnd gnd gnd nc nc nc = no connect il vcc vo2 vo1 c2 0.01 f c4 0.01 f c5 10f + c6 0.1f c1 0.1f 249 ? 06364-003 figure 17. ada4303-2 evaluation board schematic
ada4303-2 rev. 0 | page 9 of 12 outline dimensions * compliant to jedec standards mo-220-veed-1 except for exposed pad dimension. 1 0.50 bsc 0.60 max pin 1 indicator 0.75 0.55 0.35 0.25 min 0.45 top view 12 max 0.80 max 0.65 typ pin 1 indicator 1.00 0.85 0.80 0.30 0.23 0.18 0.05 max 0.02 nom 0.20 ref * 1.45 1.30 sq 1.15 12 4 10 6 7 9 3 2.75 bsc sq 3.00 bsc sq 2 5 8 11 coplanarity 0.08 exposed pad (bottom view) seating plane figure 18. 12-lead lead frame chip scale package [lfcsp_vq] 3 mm 3 mm body, very thin quad (cp-12-1) dimensions shown in millimeters ordering guide model temperature range package description pa ckage option ordering quantity branding ada4303-2acpz-rl 1 ?40c to +85c 12-lead lfcsp_vq cp-12-1 5000 h0v ada4303-2acpz-r7 1 ?40c to +85c 12-lead lfcsp_vq cp-12-1 1500 h0v ada4303-2acpz-r2 1 ?40c to +85c 12-lead lfcsp_vq cp-12-1 250 h0v ADA4303-2ACPZ-EB 1 evaluation board 1 z = pb-free part.
ada4303-2 rev. 0 | page 10 of 12 notes
ada4303-2 rev. 0 | page 11 of 12 notes
ada4303-2 rev. 0 | page 12 of 12 notes ?2006 analog devices, inc. all rights reserved. trademarks and registered trademarks are the property of their respective owners. d06364-0-10/06(0)

▲Up To Search▲

Price & Availability of ADA4303-2ACPZ-EB

	To Download ADA4303-2ACPZ-EB Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .