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high-speed, single-supply, rail-to-rail operational amplifiers micro amplifier ? series 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 out d ?n d +in d ? +in c ?n c out c nc out a ?n a +in a +v +in b ?n b out b nc opa4350 ssop-16 ad bc 1 2 3 4 5 6 7 14 13 12 11 10 9 8 out d ?n d +in d v +in c ?n c out c out a ?n a +in a v+ +in b ?n b out b opa4350 so-14 ad bc applications l cell phone pa control loops l driving a/d converters l video processing l data acquisition l process control l audio processing l communications l active filters l test equipment description opa350 series rail-to-rail cmos operational amplifi- ers are optimized for low voltage, single-supply opera- tion. rail-to-rail input/output, low noise (5nv/ ? hz), and high speed operation (38mhz, 22v/ m s) make them ideal for driving sampling analog-to-digital converters. they are also well suited for cell phone pa control loops and video processing (75 w drive capability) as well as audio and general purpose applications. single, dual, and quad versions have identical specifications for maximum design flexibility. the opa350 series operates on a single supply as low as 2.5v with an input common-mode voltage range that extends 300mv below ground and 300mv above the positive supply. output voltage swing is to within 10mv of the supply rails with a 10k w load. dual and quad designs feature completely independent circuitry for low- est crosstalk and freedom from interaction. the single (opa350) and dual (opa2350) come in the miniature msop-8 surface mount, so-8 surface mount, and 8-pin dip packages. the quad (opa4350) packages are the space-saving ssop-16 surface mount and so-14 surface mount. all are specified from C40 c to +85 c and operate from C55 c to +125 c. ? 1998 burr-brown corporation pds-1470b printed in u.s.a. march, 1999 opa350 opa2350 opa4350 features l rail-to-rail input l rail-to-rail output (within 10mv) l wide bandwidth: 38mhz l high slew rate: 22v/ m s l low noise: 5nv/ ? hz l low thd+noise: 0.0006% l unity-gain stable l micro size packages l single, dual, and quad international airport industrial park ? mailing address: po box 11400, tucson, az 85734 ? street address: 6730 s. tucson bl vd., tucson, az 85706 ? tel: (520) 746-1111 twx: 910-952-1111 ? internet: http://www.burr-brown.com/ ? cable: bbrcorp ? telex: 066-6491 ? fax: (520) 889-1510 ? i mmediate product info: (800) 548-6132 1 2 3 4 8 7 6 5 nc v+ output nc nc ?n +in v opa350 8-pin dip, so-8, msop-8 1 2 3 4 8 7 6 5 v+ out b ?n b +in b out a ?n a +in a v opa2350 8-pin dip, so-8, msop-8 a b opa350 opa2350 o pa4350 o pa 4350 for most current data sheet and other product information, visit www.burr-brown.com spice model available at www.burr-brown.com sbos099
2 opa350, 2350, 4350 opa350ea, ua, pa opa2350ea, ua, pa opa4350ea, ua specifications: v s = 2.7v to 5.5v at t a = +25 c, r l = 1k w connected to v s /2 and v out = v s /2, unless otherwise noted. boldface limits apply over the specified temperature range, t a = C40 c to +85 c. v s = 5v. parameter condition min typ (1) max units offset voltage input offset voltage v os v s = 5v 150 500 m v t a = C40 c to +85 c 1 mv vs temperature t a = C40 c to +85 c 4 m v/ c vs power supply rejection ratio psrr v s = 2.7v to 5.5v, v cm = 0v 40 150 m v/v t a = C40 c to +85 cv s = 2.7v to 5.5v, v cm = 0v 175 m v/v channel separation (dual, quad) dc 0.15 m v/v input bias current input bias current i b 0.5 10 pa vs temperature see typical performance curve input offset current i os 0.5 10 pa noise input voltage noise, f = 100hz to 400khz 4 m vrms input voltage noise density, f = 10khz e n 7 nv/ ? hz f = 100khz 5 nv/ ? hz current noise density, f = 10khz i n 4 fa/ ? hz input voltage range common-mode voltage range v cm t a = C40 c to +85 c C0.1 (v+)+0.1 v common-mode rejection ratio cmrr v s = 2.7v, C0.1v < v cm < 2.8v 66 84 db v s = 5.5v, C0.1v < v cm < 5.6v 76 90 db t a = C40 c to +85 cv s = 5.5v, C0.1v < v cm < 5.6v 74 db input impedance differential 10 13 || 2.5 w || pf common-mode 10 13 || 6.5 w || pf open-loop gain open-loop voltage gain a ol r l = 10k w , 50mv < v o < (v+) C50mv 100 122 db t a = C40 c to +85 cr l = 10k w , 50mv < v o < (v+) C50mv 100 db r l = 1k w , 200mv < v o < (v+) C200mv 100 120 db t a = C40 c to +85 cr l = 1k w , 200mv < v o < (v+) C200mv 100 db frequency response c l = 100pf gain-bandwidth product gbw g = 1 38 mhz slew rate sr g = 1 22 v/ m s settling time, 0.1% g = 1, 2v step 0.22 m s 0.01% g = 1, 2v step 0.5 m s overload recovery time v in ? g = v s 0.1 m s total harmonic distortion + noise thd+n r l = 600 w , v o = 2.5vp-p (2) , g = 1, f = 1khz 0.0006 % differential gain error g = 2, r l = 600 w , v o = 1.4v (3) 0.17 % differential phase error g = 2, r l = 600 w , v o = 1.4v (3) 0.17 deg output voltage output swing from rail (4) v out r l = 10k w , a ol 3 100db 10 50 mv t a = C40 c to +85 cr l = 10k w, a ol 3 100db 50 mv r l = 1k w, a ol 3 100db 25 200 mv t a = C40 c to +85 cr l = 1k w , a ol 3 100db 200 mv output current i out 40 (5) ma short-circuit current i sc 80 ma capacitive load drive c load see typical curve power supply operating voltage range v s t a = C40 c to +85 c 2.7 5.5 v minimum operating voltage 2.5 v quiescent current (per amplifier) i q i o = 0 5.2 7.5 ma t a = C40 c to +85 c i o = 0 8.5 ma temperature range specified range C40 +85 c operating range C55 +125 c storage range C55 +125 c thermal resistance q ja msop-8 surface mount 150 c/w so-8 surface mount 150 c/w 8-pin dip 100 c/w so-14 surface mount 100 c/w ssop-16 surface mount 100 c/w notes: (1) v s = +5v. (2) v out = 0.25v to 2.75v. (3) ntsc signal generator used. see figure 6 for test circuit. (4) output voltage swings are measured betwee n the output and power supply rails. (5) see typical performance curve, output voltage swing vs output current.
3 opa350, 2350, 4350 package specified drawing temperature package ordering transport product package number (1) range marking number (2) media single opa350ea msop-8 surface mount 337 C40 c to +85 c c50 opa350ea/250 tape and reel """"" opa350ea/2k5 tape and reel opa350ua so-8 surface-mount 182 C40 c to +85 c opa350ua opa350ua rails """"" opa350ua/2k5 tape and reel opa350pa 8-pin dip 006 C40 c to +85 c opa350pa opa350pa rails dual opa2350ea msop-8 surface-mount 337 C40 c to +85 c d50 opa2350ea/250 tape and reel """"" opa2350ea/2k5 tape and reel opa2350ua so-8 surface-mount 182 C40 c to +85 c opa2350ua opa2350ua rails """"" opa2350ua/2k5 tape and reel opa2350pa 8-pin dip 006 C40 c to +85 c opa2350pa opa2350pa rails quad opa4350ea ssop-16 surface-mount 322 C40 c to +85 c opa4350ea opa4350ea/250 tape and reel """"" opa4350ea/2k5 tape and reel opa4350ua so-14 surface mount 235 C40 c to +85 c opa4350ua opa4350ua rails """"" opa4350ua/2k5 tape and reel notes: (1) for detailed drawing and dimension table, please see end of data sheet, or appendix c of burr-brown ic data book. (2 ) models with a slash (/) are available only in tape and reel in the quantities indicated (e.g., /2k5 indicates 2500 devices per reel). ordering 2500 pieces of opa2350ea/2k5 will get a single 2500-piece tape and reel. for detailed tape and reel mechanical information, refer to appendix b of burr-brown ic data book. package/ordering information supply voltage ................................................................................... 5.5v signal input terminals, voltage (2) .................. (vC) C 0.3v to (v+) + 0.3v current (2) .................................................... 10ma output short circuit (3) .............................................................. continuous operating temperature .................................................. C55 c to +125 c storage temperature ..................................................... C55 c to +125 c junction temperature ...................................................................... 150 c lead temperature (soldering, 10s) ................................................. 300 c notes: (1) stresses above these ratings may cause permanent damage. exposure to absolute maximum conditions for extended periods may de- grade device reliability. (2) input terminals are diode-clamped to the power supply rails. input signals that can swing more than 0.3v beyond the supply rails should be current-limited to 10ma or less. (3) short circuit to ground, one amplifier per package. absolute maximum ratings (1) the information provided herein is believed to be reliable; however, burr-brown assumes no responsibility for inaccuracies or o missions. burr-brown assumes no responsibility for the use of this information, and all use of such information shall be entirely at the users own risk. prices and specifica tions are subject to change without notice. no patent rights or licenses to any of the circuits described herein are implied or granted to any third party. burr-brown does not authorize or wa rrant any burr-brown product for use in life support devices and/or systems. electrostatic discharge sensitivity this integrated circuit can be damaged by esd. burr-brown recommends that all integrated circuits be handled with appropriate precautions. failure to observe proper handling and installation procedures can cause damage. esd damage can range from subtle performance degrada- tion to complete device failure. precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
4 opa350, 2350, 4350 typical performance curves at t a = +25 c, v s = +5v, and r l = 1k w connected to v s /2, unless otherwise noted. power supply and common-mode rejection ratio vs frequency 100 90 80 70 60 50 40 30 20 10 0 psrr, cmrr (db) frequency (hz) 10 100 1k 10k 100k 1m 10m psrr cmrr (v s = +5v v cm = ?.1v to 5.1v) input voltage and current noise spectral density vs frequency 100k 10k 1k 100 10 1 10k 1k 100 10 1 0.1 voltage noise (nv ? hz) frequency (hz) 10 100 1k 10k 100k 1m 10m current noise (fa ? hz) voltage noise current noise channel separation vs frequency frequency (hz) channel separation (db) 140 130 120 110 100 90 80 70 60 100 10 1k 1m 100k 10k 10m dual and quad devices. harmonic distortion + noise vs frequency 1 (?0dbc) 0.1 (?0dbc) 0.01 (?0dbc) 0.001 (?00dbc) 0.0001 (?20dbc) harmonic distortion (%) frequency (hz) 1k 10k 100k 1m g = 1 v o = 2.5vp-p r l = 600 w 3rd harmonic 2nd harmonic open-loop gain/phase vs frequency 0.1 1 160 140 120 100 80 60 40 20 0 voltage gain (db) 0 ?5 ?0 ?35 ?80 phase ( ) frequency (hz) 10 100 1k 10k 100k 1m 10m 100m g f total harmonic distortion + noise vs frequency 1 0.1 0.01 0.001 0.0001 thd+n (%) frequency (hz) 10 100 1k 10k 100k r l = 600 w g = 100, 3vp-p (v o = 1v to 4v) g = 10, 3vp-p (v o = 1v to 4v) g = 1, 3vp-p (v o = 1v to 4v) input goes through transition region g = 1, 2.5vp-p (v o = 0.25v to 2.75v) input does not go through transition region
5 opa350, 2350, 4350 typical performance curves (cont) at t a = +25 c, v s = +5v, and r l = 1k w connected to v s /2, unless otherwise noted. open-loop gain vs temperature 130 125 120 115 110 open-loop gain (db) temperature ( c) ?5 ?0 ?5 0 25 50 75 100 125 r l = 600 w r l = 1k w r l = 10k w slew rate vs temperature temperature ( c) slew rate (v/ m s) 40 35 30 25 20 15 10 5 0 ?5 ?0 ?5 0 25 50 75 100 125 negative slew rate positive slew rate differential gain/phase vs resistive load 0.5 0.4 0.3 0.2 0.1 0 differential gain (%) differential phase ( ) resistive load ( w ) 0 100 200 300 500 400 600 800 700 900 1000 g = 2 v o = 1.4v ntsc signal generator see figure 6 for test circuit. phase gain common-mode and power supply rejection ratio vs temperature 100 90 80 70 60 cmrr (db) 110 100 90 80 70 psrr (db) temperature ( c) ?5 ?0 ?5 0 25 50 75 100 125 cmrr, v s = 5.5v (v cm = ?.1v to +5.6v) cmrr, v s = 2.7v (v cm = ?.1v to +2.8v) psrr quiescent current and short-circuit current vs temperature temperature ( c) quiescent current (ma) 7.0 6.5 6.0 5.5 5.0 4.5 4.0 3.5 100 90 80 70 60 50 40 30 short-circuit current (ma) ?5 ?0 ?5 0 25 50 75 100 125 i q +i sc ? sc quiescent current vs supply voltage supply voltage (v) quiescent current (ma) 6.0 5.5 5.0 4.5 4.0 3.5 3.0 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 per amplifier
6 opa350, 2350, 4350 typical performance curves (cont) at t a = +25 c, v s = +5v, and r l = 1k w connected to v s /2, unless otherwise noted. input bias current vs temperature input bias current (pa) temperature ( c) ?5 ?0 ?5 0 25 50 75 100 125 1k 100 10 1 0.1 input bias current vs input common-mode voltage common-mode voltage (v) input bias current (pa) 1.5 1.0 0.5 0.0 ?.5 ?.5 0.0 0.5 1.0 2.0 1.5 2.5 3.0 3.5 4.0 5.0 4.5 5.5 closed-loop output impedance vs frequency frequency (hz) output impedance ( w ) 100 10 1 0.1 0.01 0.001 0.0001 1 10 100 1k 10k 100k 1m 10m 100m g = 100 g = 10 g = 1 maximum output voltage vs frequency 100m 1m 10m frequency (hz) 100k 6 5 4 3 2 1 0 output voltage (vp-p) maximum output voltage without slew rate-induced distortion. v s = 2.7v v s = 5.5v output voltage swing vs output current output current (ma) output voltage (v) v+ (v+)? (v+)? (v?+2 (v?+1 (v? 0 10 20 30 40 +25 c +125 c ?5 c ?5 c +125 c +25 c depending on circuit configuration (including closed-loop gain) performance may be degraded in shaded region. open-loop gain vs output voltage swing 140 130 120 110 100 90 80 70 60 open-loop gain (db) output voltage swing from rails (mv) 0 20 40 60 100 80 120 160 140 180 200 i out = 4.2ma i out = 250 a i out = 2.5ma
7 opa350, 2350, 4350 typical performance curves (cont) at t a = +25 c, v s = +5v, and r l = 1k w connected to v s /2, unless otherwise noted. small-signal step response c l = 100pf 100ns/div 50mv/div settling time vs closed-loop gain 10 1 0.1 settling time ( s) closed-loop gain (v/v) ? ?0 ?00 0.1% 0.01% large-signal step response c l = 100pf 200ns/div 1v/div small-signal overshoot vs load capacitance 1m 100 1k 10k 100k load capacitance (pf) 10 80 70 60 50 40 30 20 10 0 overshoot (%) g = 1 g = ? g = 10 offset voltage ( v) offset voltage production distribution 18 16 14 12 10 8 6 4 2 0 percent of amplifiers (%) ?00 ?50 ?00 ?50 ?00 ?50 ?00 ?50 ?00 ?0 0 50 100 150 200 250 300 350 400 450 500 typical distribution of packaged units. offset voltage drift ( v/ c) offset voltage drift production distribution 20 18 16 14 12 10 8 6 4 2 0 0123456789101112131415 percent of amplifiers (%) typical production distribution of packaged units.
8 opa350, 2350, 4350 0 5v applications information opa350 series op amps are fabricated on a state-of-the-art 0.6 micron cmos process. they are unity-gain stable and suitable for a wide range of general purpose applications. rail-to-rail input/output make them ideal for driving sam- pling a/d converters. they are also well suited for control- ling the output power in cell phones. these applications often require high speed and low noise. in addition, the opa350 series offers a low cost solution for general purpose and consumer video applications (75 w drive capability). excellent ac performance makes the opa350 series well suited for audio applications. their bandwidth, slew rate, low noise (5nv/ ? hz), low thd (0.0006%), and small pack- age options are ideal for these applications. the class ab output stage is capable of driving 600 w loads connected to any point between v+ and ground. rail-to-rail input and output swing significantly increases dynamic range, especially in low voltage supply applica- tions. figure 1 shows the input and output waveforms for figure 2. simplified schematic. v s = +5, g = +1, r l = 1k w v in 1.25v/div figure 1. rail-to-rail input and output. v bias1 v bias2 v in + v in class ab control circuitry v o v (ground) v+ reference current 5v 0 v out the opa350 in unity-gain configuration. operation is from a single +5v supply with a 1k w load connected to v s /2. the input is a 5vp-p sinusoid. output voltage swing is approximately 4.95vp-p. power supply pins should be bypassed with 0.01 m f ceramic capacitors. operating voltage opa350 series op amps are fully specified from +2.7v to +5.5v. however, supply voltage may range from +2.5v to +5.5v. parameters are guaranteed over the specified supply rangea unique feature of the opa350 series. in addition, many specifications apply from C40 c to +85 c. most behavior remains virtually unchanged throughout the full operating voltage range. parameters which vary signifi- cantly with operating voltage or temperature are shown in the typical performance curves. rail-to-rail input the guaranteed input common-mode voltage range of the opa350 series extends 100mv beyond the supply rails. this is achieved with a complementary input stagean n-channel input differential pair in parallel with a p-channel differential pair (see figure 2). the n-channel pair is active for input voltages close to the positive rail, typically (v+) C 1.8v to 100mv above the positive supply, while the p-channel pair is on for inputs from 100mv below the negative supply to approximately (v+) C 1.8v. there is a small transition region, typically (v+) C 2v to (v+) C 1.6v, in which both pairs are on. this 400mv transition region can vary 400mv with process variation. thus, the transition region (both input stages on) can range from (v+) C 2.4v to (v+) C 2.0v on the low end, up to (v+) C 1.6v to (v+) C 1.2v on the high end.
9 opa350, 2350, 4350 opa350 series op amps are laser-trimmed to reduce offset voltage difference between the n-channel and p-channel input stages, resulting in improved common- mode rejection and a smooth transition between the n-channel pair and the p-channel pair. however, within the 400mv transition region psrr, cmrr, offset voltage, offset drift, and thd may be degraded compared to opera- tion outside this region. a double-folded cascode adds the signal from the two input pairs and presents a differential signal to the class ab output stage. normally, input bias current is approximately 500fa. however, large inputs (greater than 300mv beyond the supply rails) can turn on the opa350s input protection diodes, causing excessive current to flow in or out of the input pins. momentary voltages greater than 300mv beyond the power supply can be tolerated if the current on the input pins is limited to 10ma. this is easily accomplished with an input resistor as shown in figure 3. many input signals are inherently current-limited to less than 10ma, therefore, a limiting resistor is not required. performance curve small-signal overshoot vs capacitive load shows performance with a 1k w resistive load. in- creasing load resistance improves capacitive load drive ca- pability. feedback capacitor improves response for optimum settling time and stability with high-imped- ance feedback networks, it may be necessary to add a feedback capacitor across the feedback resistor, r f , as shown in figure 4. this capacitor compensates for the zero created by the feedback network impedance and the opa350s input capacitance (and any parasitic layout capacitance). the effect becomes more significant with higher impedance networks. figure 3. input current protection for voltages exceeding the supply voltage. rail-to-rail output a class ab output stage with common-source transistors is used to achieve rail-to-rail output. for light resistive loads (>10k w ), the output voltage swing is typically a ten milli- volts from the supply rails. with heavier resistive loads (600 w to 10k w ), the output can swing to within a few tens of millivolts from the supply rails and maintain high open- loop gain. see the typical performance curves output voltage swing vs output current and open-loop gain vs output voltage. capacitive load and stability opa350 series op amps can drive a wide range of capacitive loads. however, all op amps under certain conditions may become unstable. op amp configuration, gain, and load value are just a few of the factors to consider when determin- ing stability. an op amp in unity gain configuration is the most susceptible to the effects of capacitive load. the capacitive load reacts with the op amps output impedance, along with any additional load resistance, to create a pole in the small-signal response which degrades the phase margin. in unity gain, opa350 series op amps perform well with very large capacitive loads. increasing gain enhances the amplifiers ability to drive more capacitance. the typical figure 4. feedback capacitor improves dynamic perfor- mance. 5k w opax350 10ma max v+ v in v out i overload it is suggested that a variable capacitor be used for the feedback capacitor since input capacitance may vary be- tween op amps and layout capacitance is difficult to determine. for the circuit shown in figure 4, the value of the variable feedback capacitor should be chosen so that the input resistance times the input capacitance of the opa350 (typically 9pf) plus the estimated parasitic layout capacitance equals the feedback capacitor times the feed- back resistor: r in ? c in = r f ? c f where c in is equal to the opa350s input capacitance (sum of differential and common-mode) plus the layout capacitance. the capacitor can be varied until optimum performance is obtained. driving a/d converters opa350 series op amps are optimized for driving medium speed (up to 500khz) sampling a/d converters. however, they also offer excellent performance for higher speed converters. the opa350 series provides an effective means of buffering the a/ds input capacitance and resulting charge injection while providing signal gain. opa350 v+ v out v in r in r in ?c in = r f c f r f c l c in c in c f where c in is equal to the opa350? input capacitance (approximately 9pf) plus any parastic layout capacitance.
10 opa350, 2350, 4350 figure 5. opa4350 driving sampling a/d converter. figure 5 shows the opa350 driving an ads7861. the ads7861 is a dual, 500khz 12-bit sampling converter in the tiny ssop-24 package. when used with the miniature package options of the opa350 series, the combination is ideal for space-limited applications. for further informa- tion, consult the ads7861 data sheet. output impedance the low frequency open-loop output impedance of the opa350s common-source output stage is approximately 1k w . when the op amp is connected with feedback, this value is reduced significantly by the loop gain of the op amp. for example, with 122db of open-loop gain, the output impedance is reduced in unity-gain to less than 0.001 w . for each decade rise in the closed-loop gain, the loop gain is reduced by the same amount which results in a ten-fold increase in effective output impedance (see the typical performance curve, output impedance vs fre- quency). at higher frequencies, the output impedance will rise as the open-loop gain of the op amp drops. however, at these frequencies the output also becomes capacitive due to parasitic capacitance. this prevents the output impedance from becoming too high, which can cause stability prob- lems when driving capacitive loads. as mentioned previ- ously, the opa350 has excellent capacitive load drive capability for an op amp with its bandwidth. video line driver figure 6 shows a circuit for a single supply, g = 2 com- posite video line driver. the synchronized outputs of a composite video line driver extend below ground. as shown, the input to the op amp should be ac-coupled and shifted positively to provide adequate signal swing to account for these negative signals in a single-supply con- figuration. the input is terminated with a 75 w resistor and ac-coupled with a 47 m f capacitor to a voltage divider that provides the dc bias point to the input. in figure 6, this point is approximately (vC) + 1.7v. setting the optimal bias point requires some understanding of the nature of composite video signals. for best performance, one should be careful to avoid the distortion caused by the transition region of the opa350s complementary input stage. refer to the discussion of rail-to-rail input. 1/4 opa4350 v in b1 2 3 4 2k w 2k w c b1 ch b1+ ch b1 ch b0+ ch b0 ch a1+ ch a1 ch a0+ ch a0 ref in ref out serial data a serial data b busy clock cs rd convst a0 m0 m1 2 3 4 5 6 7 8 9 10 11 23 22 21 20 19 18 17 16 15 14 1/4 opa4350 v in b0 +5v 6 5 2k w 2k w c b0 1/4 opa4350 v in a1 9 10 12 13 8 7 1 2k w 2k w c a1 1/4 opa4350 v in a0 14 11 112 2k w 2k w c a0 0.1 f0.1 f +v a +v d 24 13 serial interface dgnd agnd ads7861 v in = 0v to 2.45v for 0v to 4.9v output. choose c b1 , c b0 , c a1 , c a0 to filter high frequency noise.
11 opa350, 2350, 4350 figure 6. single-supply video line driver. figure 8. 10khz low-pass filter. figure 9. 10khz high-pass filter. +2.5v v in r 2 19.6k w r 1 2.74k w ?.5v c 2 1nf r l 20k w opa350 v out c 1 4.7nf +2.5v v in c 2 270pf c 1 1830pf ?.5v r 2 49.9k w r l 20k w opa350 v out r 1 10.5k w figure 7. two op-amp instrumentation amplifier with improved high frequency common-mode rejection. opa350 +5v v out +5v (pin 7) video in r out r l cable r f 1k w r g 1k w r 4 5k w r 3 5k w c 3 10 f 0.1 f 10 f + 6 7 4 3 2 c 4 0.1 f c 5 1000 f c 2 47 f r 2 5k w r 1 75 w c 1 220 f 1/2 opa2350 1/2 opa2350 r 3 25k w r 2 25k w r g r 1 100k w r 4 100k w r l 10k w v o 50k w g = 5 + 200k w r g +5v +5v ref1004-2.5 4 8 (2.5v)
important notice texas instruments and its subsidiaries (ti) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. all products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, patent infringement, and limitation of liability. ti warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with ti's standard warranty. testing and other quality control techniques are utilized to the extent ti deems necessary to support this warranty. specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. customers are responsible for their applications using ti components. in order to minimize risks associated with the customer's applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. ti assumes no liability for applications assistance or customer product design. ti does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of ti covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. ti's publication of information regarding any third party's products or services does not constitute ti's approval, warranty or endorsement thereof. copyright ? 2000, texas instruments incorporated

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