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| 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. no license is granted by implication or otherwise under any patent or patent rights of analog devices. a ad8568/ad8569/AD8570 one technology way, p.o. box 9106, norwood, ma 02062-9106, u.s.a. tel: 781/329-4700www.analog.com fax: 781/326-8703 ? analog devices, inc., 2002 16 v rail-to-rail buffer amplifiers pin configurations 6-lead sot-23 (rt suffix) gnd in b 3 4 in a v+ 2 5 out a out b 1 6 ad8568 10-lead msop (rm suffix) 56 in a v+ in b out c in d gnd in c out d 2 9 3 8 4 7 1 10 ad8569 out b out a 32-lead lfcsp (cp suffix) pin 1 indicator top view 24 gnd 23 nc 22 out c 21 out d v+ 1 nc 2 in c 3 32 nc 20 out e 19 out f 18 nc 17 gnd nc 9 in g 10 in h 11 nc 12 nc 13 out h 14 out g 15 nc 16 in d 4 in e 5 in f 6 nc 7 v+ 8 31 in b 30 in a 29 nc 28 nc 27 out a 26 out b 25 nc AD8570 nc = no connect 20-lead tssop 20 19 18 17 16 15 14 13 12 11 out 8 out 7 v out 2 v out 3 out 6 out 5 out 4 out 1 AD8570-aru top view tssop 1 2 3 4 5 6 7 8 9 10 in 8 in 7 v+ in 2 v+ in 3 in 6 in 5 in 4 in 1 features single-supply operation: 4.5 v to 16 v input capability beyond the rails rail-to-rail output swing continuous output current: 35 ma peak output current: 250 ma offset voltage: 10 mv max slew rate: 6 v/ s stable with 1 f loads supply current applications lcd reference drivers portable electronics communications equipment general description the ad8568, ad8569, and AD8570 are low cost single-supply buffer amplifiers with rail-to-rail input and output capability. they are optimized for lcd monitor applications and built on an advanced high voltage cbcmos process. the ad8568 includes two buffers, the ad8569 includes four buffers, and the AD8570 includes eight buffers. these lcd buffers have high slew rates, 35 ma continuous output drive, and high capacitive load drive capability. they have wide supply range and offset voltages below 10 mv. the ad8568, ad8569, and AD8570 are specified over the ?0 c to +85 c temperature range. they are available on tape and reel, with the ad8568 packaged in a 6-lead sot -23, the ad8569 in a 10-lead msop, and the AD8570 in a 32-lead lfcsp and 20- lead tssop.
?2? rev. b ad8568/ad8569/AD8570especifications electrical characteristics parameter symbol conditions min typ max unit input characteristics offset voltage v os 210mv offset voltage drift v os / t e40 c t a +85 c5 v/ c input bias current i b 80 600 na e40 c t a +85 c 800 na input voltage range e0.5 ev s + 0.5 v input impedance z in 400 k input capacitance c in 1pf output characteristics output voltage high v oh i l = 100 av s e 0.005 v v s = 16 v, i l = 5 ma 15.85 15.95 v e40 c t a +85 c 15.75 v v s = 4.5 v, i l = 5 ma 4.2 4.38 v e40 c t a +85 c 4.1 v output voltage low v ol i l = 100 a5mv v s = 16 v, i l = 5 ma 42 150 mv e40 c t a +85 c 250 mv v s = 4.5 v, i l = 5 ma 95 300 mv e40 c t a +85 c 400 mv continuous output current i out 35 ma peak output current i pk v s = 16 v 250 ma transfer characteristics gain a vcl r l = 2 k 0.995 0.9985 1.005 v/v e40 c t a +85 c 0.995 0.9980 1.005 v/v gain linearity nl r l = 2 k , v o = 0.5 to (v s e 0.5 v) 0.01 % power supply supply voltage v s 4.5 16 v power supply rejection ratio psrr v s = 4 v to 17 v e40 c t a +85 c7090 db supply current/amplifier i sy v o = v s /2, no load 700 850 a e40 c t a +85 c1ma dynamic performance slew rate sr r l = 10 k , c l = 200 pf 4 6 v/ s bandwidth bw e3 db, r l = 10 k , c l = 10 pf 6 mhz phase margin o r l = 10 k , c l = 10 pf 65 degrees channel separation 75 db noise performance voltage noise density e n f = 1 khz 26 nv/ hz hz hz hz hz ?3? ad8568/ad8569/AD8570 rev. b absolute maximum ratings * supply voltage (v s ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 v input voltage . . . . . . . . . . . . . . . . . . . . . . e0.5 v to v s + 0.5 v differential input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . v s storage temperature range . . . . . . . . . . . . e65 c to +150 c operating temperature range . . . . . . . . . . . e40 c to +85 c junction temperature range . . . . . . . . . . . . e65 c to +150 c lead temperature range (soldering, 60 sec) . . . . . . . . 300 c * stresses above those listed under absolute maximum ratings may cause perma- nent damage to the device. this is a stress rating only; functional operation of the device at these or any other conditions above those listed in the operational sections of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. package type ja 1 jc jb 2 unit 6-lead sot-23 (rt) 250 140 c/w 10-lead msop (rm) 200 44 c/w 20-lead tssop (ru) 72 45 c/w 32-lead lfcsp (cp) 35 13 c/w notes 1 ja is specified for worst-case conditions, i.e., ja is specified for device soldered onto a circuit board for surface-mount packages. 2 jb is applied for calculating the junction temperature by reference to the board temperature. ordering guide temperature package package branding model * range description option information ad8568art e40 c to +85 c 6-lead sot-23 rt-6 awa ad8569arm e40 c to +85 c 10-lead msop rm-10 axa AD8570acp e40 c to +85 c 32-lead lfcsp cp-32 AD8570aru e40 c to +85 c 20-lead tssop ru-20 * available in reels only. caution esd (electrostatic discharge) sensitive device. electrostatic charges as high as 4000 v readily accumulate on the human body and test equipment and can discharge without detection. although the ad8568/ad8569/AD8570 features proprietary esd protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. therefore, proper esd precautions are recommended to avoid performance degradation or loss of functionality. warning! esd sensitive device ?4? ad8568/ad8569/AD8570 rev. b input offset voltage e mv 100 0 12 9 qu antity e amplifiers 6 3 0 36912 90 50 30 20 10 80 70 40 60 t a = 25 c 4.5v < v s < 16v tpc 1. input offset voltage distribution tcvos e v/ c 300 150 0 0 100 10 qu antity e amplifiers 20 30 40 50 60 70 80 90 250 200 100 50 4.5v < v s < 16v tpc 2. input offset voltage drift distribution temperature e c 0 0.25 1.50 40 input offset voltage e mv +25 +85 0.50 0.75 1.00 1.25 v cm = v s /2 v s = 16v v s = 4.5v tpc 3. input offset voltage vs. temperature temperature e c 0 50 350 40 input bias current e na +25 +85 150 200 250 300 v cm = v s /2 v s = 16v v s = 4.5v 100 tpc 4. input bias current vs. temperature temperature e c 5 5 40 input offset current e na +25 +85 2 3 4 v s = 16v v s = 4.5v 1 4 3 2 1 0 tpc 5. input offset current vs. temperature temperature e c 15.96 15.86 40 output voltage e v +25 +85 15.89 15.88 15.87 v s = 16v v s = 4.5v 15.90 15.95 15.94 15.93 15.92 15.91 i load = 5ma 4.46 4.36 4.39 4.38 4.37 4.40 4.45 4.44 4.43 4.42 4.41 tpc 6. output voltage swing vs. temperature etypical performance characteristics ?5? ad8568/ad8569/AD8570 rev. b temperature e c 150 0 40 output voltage e mv +25 +85 45 30 15 v s = 16v v s = 4.5v 60 135 120 105 90 75 i load = 5ma tpc 7. output voltage swing vs. temperature temperature e c 0.9999 0.9995 40 gain error e v/v +25 +85 r l = 2k 4.5v < v s < 16v v out = 0.5v to 15v 0.9997 r l = 600 tpc 8. voltage gain vs. temperature load current e ma 10 0.1 0.001 100 0.01 output voltage e mv 0.1 1 10 1 100 1k t a = 25 c v s = 16v v s = 4.5v tpc 9. output voltage to supply rail vs. load current temperature e c 0.80 0.50 40 supply current/amplifier e ma +25 +85 0.65 0.60 0.55 v s = 16v v s = 4.5v 0.70 v cm = v s /2 0.75 tpc 10. supply current/amplifier vs. temperature temperature e c 7 0 40 slew rate e v/ s +25 +85 3 2 1 v s = 16v v s = 4.5v 4 r l = 10k c l = 200pf 5 6 tpc 11. slew rate vs. temperature supply voltage e v 1.0 0 018 2 supply current/amplifier e ma 46810 12 14 16 0.9 0.5 0.3 0.2 0.1 0.8 0.7 0.4 0.6 t a = 25 c a v = 1 v o = v s /2 tpc 12. supply current/amplifier vs. supply voltage ?6? ad8568/ad8569/AD8570 rev. b frequency e hz 10 40 100k 100m gain e db 10m 1m 35 30 25 20 15 10 5 5 0 1k 10k 560 150 t a = 25 c v s = 8v v in = 50mv rms c l = 40pf a v = 1 tpc 13. frequency response vs. resistive loading frequency e hz 25 100k 100m gain e db 10m 1m 25 20 15 10 5 20 0 1040pf t a = 25 c v s = 8v v in = 50mv rms r l = 10k a v = 1 10 5 15 50pf 100pf 540pf tpc 14. frequency response vs. capacitive loading frequency e hz 100 10m 1k impedance e 10k 100k 1m 500 450 0 400 350 300 250 200 150 100 v s = 16v v s = 4.5v 50 tpc 15. closed-loop output impedance vs. frequency output swing e v p-p frequency e hz 10m 1m 100k 10k 1k 100 10 0 2 4 6 8 10 12 14 16 18 t a = 25 c v s = 16v a v = 1 r l = 10k distortion < 1% tpc 16. closed-loop output swing vs. frequency frequency e hz 100 10m 1k power supply rejection e db 10k 100k 1m 160 140 40 120 100 80 60 40 20 0 + psrr 20 psrr t a = 25 c v s = 16v tpc 17. power supply rejection ratio vs. frequency frequency e hz 100 10m 1k power supply rejection e db 10k 100k 1m 160 140 40 120 100 80 60 40 20 0 + psrr 20 psrr t a = 25 c v s = 4.5v tpc 18. power supply rejection ratio vs. frequency ?7? ad8568/ad8569/AD8570 rev. b frequency e hz 1,000 100 1 10 10k 100 vo ltag e noise density e nv/ hz h hz h h h h z ?8? ad8568/ad8569/AD8570 rev. b time e 2 s/div 0 0 00 0 vo lta ge e 1v/div 000000 0 0 0 0 0 0 0 t a = 25 c v s = 4.5v a v = 1 r l = 10k c l = 300pf tpc 25. large signal transient response time e 1 s/div 0 0 00 0 vo lta ge e 50mv/div 000000 0 0 0 0 0 0 0 t a = 25 c v s = 16v a v = 1 r l = 10k c l = 100pf tpc 26. small signal transient response time e 1 s/div 0 0 00 0 vo lta ge e 50mv/div 000000 0 0 0 0 0 0 0 t a = 25 c v s = 4.5v a v = 1 r l = 10k c l = 100pf tpc 27. small signal transient response time e 40 s/div 0 0 00 0 vo lta ge e 3v/div 000000 0 0 0 0 0 0 0 t a = 25 c v s = 16v a v = 1 r l = 10k tpc 28. no phase reversal ?9? ad8568/ad8569/AD8570 rev. b applications theory of operation this family of buffers is designed to drive large capacitive loads in lcd applications. each has high output current drive, rail- to-rail input/output operation, and can be powered from a single 16 v supply. t hey are also intended for other applications where low distortion and high output current drive are needed. input overvoltage protection as with any semiconductor device, whenever the input exceeds either supply voltage, attention needs to be paid to the input overvoltage characteristics. as an overvoltage occurs, the amplifier could be damaged, depending on the voltage level and the magnitude of the fault current. when the input voltage exceeds either supply by more than 0.6 v, internal pin junctions will allow current to flow from the input to the supplies. this input current is not inherently damaging to the device as long as it is limited to 5 ma or less. if a condition exists using the buffers where the input exceeds the supply by more than 0.6 v, a series external resistor should be added. the size of the resistor can be calculated by using the maximum overvoltage divided by 5 ma. this resistance should be placed in series with the input exposed to an overvoltage. output phase reversal the buffer family is immune to phase reversal. although the device?s output will not change phase, large currents due to input overvoltage could damage the device. in applications where the possibility exists of an input voltage exceeding the supply voltage, overvoltage protection should be used as described in the previous section. power dissipation the maximum allowable internal junction temperature of 150 c limits the buffer family maximum power dissipation. as the ambi- ent temperature increases, the maximum power dissipated by the buffer family must decrease linearly to maintain the maximum junction temperature. if this maximum junction temperature is exceeded momentarily, the part will still operate properly once the junction temperature is reduced below 150 c. if the maxi- mum junction temperature is exceeded for an extended period of time, overheating could lead to permanent damage of the device. the maximum safe junction temperature, t jmax , is 150 c. using the following formula, we can obtain the maximum power that the buffer family can safely dissipate as a function of temperature. ptt diss a a =? () jmax j / where: p diss = power dissipation t j max = maximum allowable junction temp (150 c) t a = ambient temperature of the circuit j a = ad856x package thermal resistance, junction-to-ambient the power dissipated by the device can be calculated as pvv i diss s out load =? () where: v s = supply voltage v out = output voltage i load = output load current figure 1 shows the maximum power dissipation versus temperature. to achieve proper operation, use the previous equation to calculate p diss for a specific package at any given temperature, or see figure 1. ambient temperature e c 1.0 0.75 0 35 85 15 maximum power dissipation e watts 5254 565 0.5 0.25 10-lead msop 6-lead sot-23 figure 1. maximum power dissipation vs. temperature for 6- and 10-lead packages thd + n the buffer family features low total harmonic distortion. figure 2 shows a graph of thd + n versus frequency. the total harmonic distortion plus noise for the buffer over the entire supply range is below 0.08%. when the device is powered from a 16 v supply, the thd + n stays below 0.03%. figure 2 shows the ad8568 thd + n versus frequency performance. fre q uency e hz 20 30k thd + n e % 100 1k 10k 10 1 0.01 0.1 v s = 2.5v v s = 8v figure 2. ad8568 thd + n vs. frequency short circuit output conditions the buffer family does not have internal short circuit protection circuitry. as a precautionary measure, do not short the output directly to the positive power supply or to ground. it is not recommended to operate the ad856x with more than 35 ma of continuous output current. the output current can be limited by placing a series resistor at the output of the amplifier whose value can be derived using the following equation: r v ma x s 35 for a 5 v single-supply operation, r x should have a minimum value of 143 . ?10? ad8568/ad8569/AD8570 rev. b outline dimensions dimensions shown in inches and (millimeters) 6-lead sot-23 (rt suffix) 1 3 4 5 2 6 0.122 (3.10) 0.106 (2.70) pin 1 0.071 (1.80) 0.059 (1.50) 0.118 (3.00) 0.098 (2.50) 0.075 (1.90) bsc 0.037 (0.95) bsc 0.009 (0.23) 0.003 (0.08) 0.022 (0.55) 0.014 (0.35) 10 0 0.020 (0.50) 0.010 (0.25) 0.006 (0.15) 0.000 (0.00) 0.051 (1.30) 0.035 (0.90) seating plane 0.057 (1.45) 0.035 (0.90) 10-lead msop (rm suffix) 0.011 (0.28) 0.003 (0.08) 0.120 (3.05) 0.112 (2.84) 0.022 (0.56) 0.021 (0.53) 6 0 10 6 5 1 0.0197 (0.50) bsc 0.124 (3.15) 0.112 (2.84) 0.124 (3.15) 0.112 (2.84) 0.199 (5.05) 0.187 (4.75) pin 1 0.122 (3.10) 0.110 (2.79) 0.006 (0.15) 0.002 (0.05) 0.016 (0.41) 0.006 (0.15) 0.038 (0.97) 0.030 (0.76) seating plane 0.043 (1.09) 0.037 (0.94) 32-lead lfcsp (cp suffix) 1 32 8 9 25 24 16 17 bottom view 0.128 (3.25) 0.122 (3.10) sq 0.116 (2.95) 0.020 (0.50) 0.016 (0.40) 0.012 (0.30) 0.012 (0.30) 0.009 (0.23) 0.007 (0.18) 0.138 (3.50) ref 0.024 (0.60) 0.017 (0.42) 0.009 (0.24) 0.024 (0.60) 0.017 (0.42) 0.009 (0.24) 0.010 (0.25) min 0.020 (0.50) bsc 12 max 0.035 (0.90) max 0.033 (0.85) nom 0.008 (0.20) ref 0.031 (0.80) max 0.026 (0.65) nom 0.002 (0.05) 0.0004 (0.01) 0.0 (0.00) seating plane pin 1 indicator top view 0.187 (4.75) bsc sq 0.197 (5.0) bsc sq 20-lead tssop (ru suffix) 20 1 11 10 0.256 (6.50) 0.246 (6.25) 0.177 (4.50) 0.169 (4.30) pin 1 0.260 (6.60) 0.252 (6.40) seating plane 0.006 (0.15) 0.002 (0.05) 0.0118 (0.30) 0.0075 (0.19) 0.0256 (0.65) bsc 0.0433 (1.10) max 0.0079 (0.20) 0.0035 (0.090) 0.028 (0.70) 0.020 (0.50) 8 0 ?11? ad8568/ad8569/AD8570 rev. b revision history location page 5/02edata sheet changed from rev. a to rev. b. added 20-lead tssop package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 added package type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 updated ordering guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 added tssop package to outline dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 ?12? c02612?0?5/02(b) printed in u.s.a. |
Price & Availability of AD8570
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