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cmos 1.8 v to 5.5 v, 2.5 2:1 mux/spdt switch in sc70 package adg749 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 ?2005C2009 analog devices, inc. all rights reserved. 02075-001 switch shown for a logic 1 input features 1.8 v to 5.5 v single supply 5 (maximum) on resistance 0.75 (typical) on resistance flatness automotive temperature range: ?40c to +125c C3 db bandwidth > 200 mhz rail-to-rail operation 6-lead sc70 package fast switching times t on = 12 ns t off = 6 ns typical power consumption (< 0.01 w) ttl/cmos compatible applications battery-powered systems communication systems sample-and-hold systems audio signal routing video switching mechanical reed relay replacement functional block diagram adg749 s2 s1 d in figure 1. general description the adg749 is a monolithic cmos spdt switch. this switch is designed on a submicron process that provides low power dissipation yet gives high switching speed, low on resistance, and low leakage currents. the adg749 can operate from a single-supply range of 1.8 v to 5.5 v, making it ideal for use in battery-powered instruments and with the new generation of dacs and adcs from analog devices, inc. each switch of the adg749 conducts equally well in both directions when on. the adg749 exhibits break-before-make switching action. because of the advanced submicron process, ?3 db bandwidths of greater than 200 mhz can be achieved. the adg749 is available in a 6-lead sc70 package. product highlights 1. 1.8 v to 5.5 v single-supply operation. the adg749 offers high performance, including low on resistance and fast switching times, and is fully specified and guaranteed with 3 v and 5 v supply rails. 2. ver y l ow r on (5 maximum at 5 v and 10 maximum at 3 v). at 1.8 v operation, r on is typically 40 over the temperature range. 3. automotive temperature range: ?40c to +125c. 4. on resistance flatness (r flat(on) ) (0.75 typical). 5. ?3 db bandwidth > 200 mhz. 6. low power dissipation. cmos construction ensures low power dissipation. 7. fast t on /t off . 8. tiny, 6-lead sc70 package.
adg749 rev. b | page 2 of 12 table of contents features .............................................................................................. 1 ? applications ....................................................................................... 1 ? functional block diagram .............................................................. 1 ? general description ......................................................................... 1 ? product highlights ........................................................................... 1 ? revision historyrevision history .................................................. 2 ? specifications ..................................................................................... 3 ? absolute maximum ratings ............................................................ 5 ? esd caution .................................................................................. 5 ? pin configuration and function descriptions ............................. 6 ? terminology .......................................................................................7 ? typical performance characteristics ..............................................8 ? test circuits ..................................................................................... 10 ? applications information .............................................................. 11 ? adg749 supply voltages .......................................................... 11 ? on response vs. frequency ...................................................... 11 ? off isolation ................................................................................ 11 ? outline dimensions ....................................................................... 12 ? ordering guide .......................................................................... 12 ? revision history 10/09rev. a to rev. b updated format .................................................................. universal added pb-free information to table 3 .......................................... 5 added table 4 .................................................................................... 6 updated outline dimensions ....................................................... 12 changes to ordering guide .......................................................... 12 7/02rev. 0 to rev. a. changes to features .......................................................................... 1 additions to product highlights .................................................... 1 changes to specifications ................................................................ 2 edits to absolute maximum ratings ............................................. 4 changes to terminology .................................................................. 4 edits to ordering guide .................................................................. 4 added new tpcs 4 and 5 ................................................................ 5 added tpc 10 ................................................................................... 6 test circuits 6, 7, and 8 replaced .................................................... 7 updated ks-6 package drawing ..................................................... 9 01/01revision 0: initial version
adg749 rev. b | page 3 of 12 specifications v dd = 5 v 10% and gnd = 0 v; t a = ?40c to +125c unless otherwise stated. table 1. parameter 25c ?40c to +85c ?40c to +125c unit test conditions/comments analog switch analog signal range 0 v to v dd v on resistance (r on ) 2.5 typ v s = 0 v to v dd , i s = ?10 ma; 5 6 7 max see figure 13 on resistance match between channels (r on ) 0.1 typ v s = 0 v to v dd , i s = ?10 ma 0.8 0.8 max on resistance flatness (r flat(on) ) 0.75 typ v s = 0 v to v dd , i s = ?10 ma 1.2 1.5 max leakage currents 1 v dd = 5.5 v source off leakage i s (off ) 0.01 na typ v s = 4.5 v/1 v, v d = 1 v/4.5 v; 0.25 0.35 1 na max see figure 14 channel on leakage i d , i s (on) 0.01 na typ v s = v d = 1 v or v s = v d = 4.5 v; 0.25 0.35 5 na max see figure 15 digital inputs input high voltage, v inh 2.4 v min input low voltage, v inl 0.8 v max input current i inl or i inh 0.005 a typ v in = v inl or v inh 0.1 a max dynamic characteristics 1 t on 7 ns typ r l = 300 , c l = 35 pf 12 ns max v s = 3 v; see figure 16 t off 3 ns typ r l = 300 , c l = 35 pf 6 ns max v s = 3 v; see figure 16 break-before-make time delay, t d 8 ns typ r l = 300 , c l = 35 pf, 1 ns min v s1 = v s2 = 3 v; see figure 17 off isolation ?67 db typ r l = 50 , c l = 5 pf, f = 10 mhz ?87 db typ r l = 50 , c l = 5 pf, f = 1 mhz; see figure 18 channel-to-channel crosstalk ?62 db typ r l = 50 , c l = 5 pf, f = 10 mhz ?82 db typ r l = 50 , c l = 5 pf, f = 1 mhz; see figure 19 bandwidth ?3 db 200 mhz typ r l = 50 , c l = 5 pf; see figure 20 c s (off ) 7 pf typ c d , c s (on) 27 pf typ power requirements v dd = 5.5 v digital inputs = 0 v or 5.5 v i dd 0.001 a typ 1.0 a max 1 guaranteed by design, not subject to production test.
adg749 rev. b | page 4 of 12 v dd = 3 v 10% and gnd = 0 v; t a = ?40c to +125c unless otherwise stated table 2. parameter 25c ?40c to +85c ?40c to +125c unit test conditions/comments analog switch analog signal range 0 v to v dd v on resistance (r on ) 6 7 typ v s = 0 v to v dd , i s = C10 ma; 10 12 max see figure 13 on resistance match between channels (r on ) 0.1 typ v s = 0 v to v dd , i s = C10 ma 0.8 0.8 max on resistance flatness (r flat(on) ) 2.5 typ v s = 0 v to v dd , i s = C10 ma leakage currents 1 v dd = 3.3 v source off leakage is (off ) 0.01 na typ v s = 3 v/1 v, v d = 1 v/3 v; 0.25 0.35 1 na max see figure 14 channel on leakage i d , i s (on) 0.01 na typ v s = v d = 1 v or v s = v d = 3 v; 0.25 0.35 5 na max see figure 15 digital inputs input high voltage, v inh 2.0 v min input low voltage, v inl 0.8 v max input current i inl or i inh 0.005 a typ v in = v inl or v inh 0.1 a max dynamic characteristics 1 t on 10 ns typ r l = 300 , c l = 35 pf 15 ns max v s = 2 v; see figure 16 t off 4 ns typ r l = 300 , c l = 35 pf 8 ns max v s = 2 v; see figure 16 break-before-make time delay, t d 8 ns typ r l = 300 , c l = 35 pf 1 ns min v s1 = v s2 = 2 v; see figure 17 off isolation C67 db typ r l = 50 , c l = 5 pf, f = 10 mhz C87 db typ r l = 50 , c l = 5 pf, f = 1 mhz; see figure 18 channel-to-channel crosstalk C62 db typ r l = 50 , c l = 5 pf, f = 10 mhz C82 db typ r l = 50 , c l = 5 pf, f = 1 mhz; see figure 19 bandwidth ?3 db 200 mhz typ r l = 50 , c l = 5 pf; see figure 20 c s (off ) 7 pf typ c d , c s (on) 27 pf typ power requirements v dd = 3.3 v digital inputs = 0 v or 3.3 v i dd 0.001 a typ 1.0 a max 1 guaranteed by design, not subject to production test.
adg749 rev. b | page 5 of 12 absolute maximum ratings t a = 25c unless otherwise noted. table 3. parameter ratings v dd to gnd ?0.3 v to +7 v analog, digital input 1 ?0.3 v to v dd + 0.3 v or 30 ma, whichever occurs first peak current, s or d 100 ma (pulsed at 1 ms, 10% duty cycle max) continuous current, s or d 30 ma operating temperature range industrial (b version) ?40c to +125c storage temperature range ?65c to +150c junction temperature 150c sc70 package, power dissipation 315 mw ja thermal impedance 332c/w jc thermal impedance 120c/w lead temperature, soldering vapor phase (60 sec) 215c infrared (15 sec) 220c pb-free reflow soldering peak temperature 260(+0/C5)c time at peak temperature 10 sec to 40 sec 1 overvoltage at in, s or d will be clamped by internal diodes. current should be limited to the maximum ratings given. stresses above those listed under absolute maximum ratings 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. only one absolute maximum rating can be applied at any one time. esd caution
adg749 rev. b | page 6 of 12 02075-002 pin configuration and fu nction descriptions in 1 s2 6 v dd 2 d 5 gnd 3 s1 4 adg749 top view (not to scale) figure 2. pin configuration table 4. pin function descriptions pin nuber neonic description 1 in digital control input pin. 2 v dd most positive power supply pin. 3 gnd ground (0 v) reference pin. 4 s1 source terminal of the multiplexe r. can be used as input or output. 5 d drain terminal of the multiplexer. can be used as input or output. 6 s2 source terminal of the multiplexe r. can be used as input or output. table 5. truth table ad749 in switch s1 switch s2 0 on off 1 off on
adg749 rev. b | page 7 of 12 terminology r on ohmic resistance between d and s. r on on resistance match between any two channels, such as: r on max ? r on min. r flat(on) flatness is defined as the difference between the maximum and minimum value of on resistance as measured over the specified analog signal range. i s (off) source leakage current with the switch off. i d , i s (on) channel leakage current with the switch on. v d (v s ) analog voltage on terminals d and s. c s (off) off switch source capacitance. c d , c s (on) on switch capacitance. t on delay between applying the digital control input and the output switching on. t off delay between applying the digital control input and the output switching off. t d off time or on time measured between the 90% points of both switches, when switching from one address state to another. crosstalk a measure of unwanted signal that is coupled through from one channel to another as a result of parasitic capacitance. off isolation a measure of unwanted signal coupling through an off switch. bandwidth the frequency at which the output is attenuated by ?3 dbs. on response the frequency response of the on switch. insertion loss loss due to on resistance of the switch.
adg749 rev. b | page 8 of 12 typical performance characteristics 6.0 3.0 3.5 4.0 4.5 5.0 5.5 2.5 2.0 1.5 1.0 0.5 r on ( ? ) 0 05 . 0 4.54.03.53.02.52.01.51.00.5 02075-003 v d or v s , drain or source voltage (v) 0.15 0.10 0.05 0 ?0.05 0 102030405060708090 current (na) temperature (c) 02075-006 v dd = 2.7v v dd = 3.0v v dd = 5.0v v dd = 4.5v t a = 25c v dd = 5v v d = 4.5v/1v v s = 1v, 4.5v i d , i s (on) i s (off) figure 3. on resistance vs. v d (v s ) single supplies 6.0 3.0 3.5 4.0 4.5 5.0 5.5 2.5 2.0 1.5 1.0 0.5 r on ( ? ) 075-004 figure 6. leakage currents vs. temperature 0 03 . 0 2.5 2.0 1.5 1.0 0.5 v d or v s , drain or source voltage (v) 02 v dd = 3v ?40c +25c +85c figure 4. on resistance vs. v d (v s ) for different temperature, v dd = 3 v 6.0 3.0 3.5 4.0 4.5 5.0 5.5 2.5 2.0 1.5 1.0 0.5 r on ( ? ) 075-005 0.15 0.10 0.05 0 ?0.05 0 102030405060708090 current (na) temperature (c) 02075-007 v dd = 3v v d = 3v/1v v s = 1v, 3v i d , i s (on) i s (off) figure 7. leakage currents vs. temperature 0 05 . 0 3.0 3.5 4.0 4.5 2.52.01.51.00.5 v d or v s , drain or source voltage (v) 02 v dd = 5v ?40c +25c +85c figure 5. on resistance vs. v d (v s ) for different temperatures, v dd = 5 v 10m 1m 100 10 1 100n 10n 1n 1 10 100 1k 10k 100k 1m 10m 100m i supply (a) 02075-008 v dd = 5v frequency (hz) figure 8. supply current vs. input switching frequency
adg749 rev. b | page 9 of 12 ? 30 ?40 ?50 ?60 ?70 ?80 ?90 ?100 ?110 ?120 off isolation (db) 075-009 0 ?2 ?4 ?6 10k 100k 1m 10m 100m on response (db) frequency (hz) 02075-011 v dd = 5v, 3v v dd = 5v 12 ?2 0 2 4 6 8 10 q inj (pc) 075-012 v dd = 5v v dd = 3v ?130 10k 100k 1m 10m 100m frequency (hz) 02 figure 9. off isol ation vs. frequency ? 30 ?40 ?50 ?60 ?70 ?80 ?90 ?100 ?110 ?120 ?130 10k 100k 1m 10m 100m crosstalk (db) frequency (hz) 02075-010 v dd = 5v, 3v figure 10. crosstalk vs. frequency figure 11. on response vs. frequency ?4 012345 v s (v) 02 figure 12. charge injection vs. source voltage
adg749 rev. b | page 10 of 12 02075-013 test circuits sd v s r on = v1/i ds v1 i ds figure 13. on resistance 02075-014 sd v d i d (off) v s a i s (off) a figure 14. off leakage 02075-015 sd v d i d (on) v s a figure 15. on leakage v 0.1f v s in sd gnd dd v out r l 300 ? c l 35pf v dd v out t on t of f v in 90% 90% 50% 50% 0207 5-016 figure 16. switching times gnd 02075-017 in v in s2 s1 v s2 v s1 d2 v out r l2 300? c l2 35pf v dd v dd v 0.1f v out t d t d in 50% 50% 50% 50% 0v 0v figure 17. break-before-make time delay, t d v 50 ? 50 ? v s r l 50 ? s in v in gnd v dd dd d 0.1f v out network analyzer off isolation = 20 log v out v s 02075-018 figure 18. off isolation 0 2075-019 r l 50 ? d s1 s2 in gnd channel-to-channel v dd v dd v 0.1f r 50 ? v out network analyzer crosstalk = 20 log v out v s v s 50 ? figure 19. channel-to-channel crosstalk 50? v s r l 50? s in v in gnd v dd dd d 0.1f v out network analyzer insertion loss = 20 lo g v out with switch v out without switch 0 2075-020 figure 20. bandwidth
adg749 rev. b | page 11 of 12 applications information the adg749 belongs to analog devices new family of cmos switches. this series of general-purpose switches has improved switching times, offering lower on resistance, higher band- widths, low power consumption, and low leakage currents. adg749 supply voltages functionality of the adg749 extends from 1.8 v to 5.5 v single supply, which makes it ideal for battery-powered instruments, where power efficiency and performance are important design parameters. it is important to note that the supply voltage affects the input signal range, the on resistance, and the switching times of the part. by taking a look at the typical performance characteristics and the specifications, the effects of the power supplies can be clearly seen. for v dd = 1.8 v operation, r on is typically 40 over the temperature range. on response vs. frequency figure 21 illustrates the parasitic components that affect the ac performance of cmos switches (the switch is shown surrounded by a box). additional external capacitances will further degrade some performance. these capacitances affect feedthrough, crosstalk, and system bandwidth. 0 2075-0 21 s v d c ds c d r on c load v out r load in figure 21. switch represented by equivalent parasitic components the transfer function that describes the equivalent diagram of the switch ( figure 21 ) is of the form a(s) shown below. () () ? ? ? ? + 1 dson t t crrs ? ? ? ? + = 1 )( dson crs rsa where: r t = r load /(r load + r on ) c t = c load + c d + c ds the signal transfer characteristic is dependent on the switch channel capacitance, c ds . this capacitance creates a frequency zero in the numerator of the transfer function a(s) . because the switch on resistance is small, this zero usually occurs at high frequencies. the bandwidth is a function of the switch output capacitance combined with c ds and the load capacitance. the frequency pole corresponding to these capacitances appears in the denominator of a(s). the dominant effect of the output capacitance, c d , causes the pole breakpoint frequency to occur first. therefore, in order to maximize bandwidth, a switch must have a low input and output capacitance and low on resistance. the on response vs. frequency plot for the adg749 is shown in figure 11 . off isolation off isolation is a measure of the input signal coupled through an off switch to the switch output. the capacitance, c ds , couples the input signal to the output load when the switch is off, as shown in figure 22 . 0 2075-022 s v in d c ds c d c load v out r load figure 22. off isolation is affected by external load resistance and capacitance the larger the value of cds, the larger the values of feed- through that will be produced. the typical performance characteristic graph of figure 9 illustrates the drop in off isolation as a function of frequency. from dc to roughly 200 khz, the switch shows better than ?95 db isolation. up to frequencies of 10 mhz, the off isolation remains better than ?67 db. as the frequency increases, more and more of the input signal is coupled through to the output. off isolation can be maximized by choosing a switch with the smallest c ds possible. the values of load resistance and capacitance also affect off isolation, since they contribute to the coefficients of the poles and zeros in the transfer function of the switch when open. ( ) () () ? ? ? ? ? ? ? ? +++ = 1 )( ds d load load ds load cccrs crs sa
adg749 rev. b | page 12 of 12 1.30 bsc compliant to jedec standards mo-203-ab 1.00 0.90 0.70 outline dimensions 2.20 2.00 1.80 0.46 0.36 0.26 2.40 2.10 1.80 1.35 1.25 1.15 072809-a 0.10 max 1.10 0.80 0.40 0.10 0.22 0.08 3 12 4 6 5 0.65 bsc coplanarity 0.10 seating plane 0.30 0.15 figure 23. 6-lead plastic surface mount package [sc70] (ks-6) dimensions shown in millimeters ordering guide model temperature range package description package option branding 1 adg749bksz-r2 2 ?40c to +125c sc70 (6-lead plastic surface mount) ks-6 s1m adg749bksz-reel 2 ?40c to +125c sc70 (6-lead plastic surface mount) ks-6 s1m ADG749BKSZ-REEL7 2 ?40c to +125c sc70 (6-lead plastic surface mount) ks-6 s1m 1 branding on this package is limited to three characters due to space constraints. 2 z= rohs compliant part. ?2005C2009 analog devices, inc. all rights reserved. trademarks and registered trademarks are the prop erty of their respective owners. d02075-0-10/09(b)

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