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1 LT1222 descriptio u features applicatio s u typical applicatio u 500mhz, 3nv/ ? hz, a v 3 10 operational amplifier n gain-bandwidth: 500mhz n gain of 10 stable uncompensated n slew rate: 200v/ m s n input noise voltage: 3nv/ ? hz n c-load tm op amp drives capacitive loads n external compensation pin n maximum input offset voltage: 300 m v n maximum input bias current: 300na n maximum input offset current: 300na n minimum output swing into 500 w : 12v n minimum dc gain: 100v/mv, r l = 500 w n settling time to 0.1%: 75ns, 10v step n settling time to 0.01%: 120ns, 10v step n differential gain: 0.4%, a v = 2, r l = 150 w n differential phase: 0.1 , a v = 2, r l = 150 w the lt ? 1222 is a low noise, very high speed operational amplifier with superior dc performance. the LT1222 is stable in a noise gain of 10 or greater without compensa- tion, or the part can be externally compensated for lower closed-loop gain at the expense of lower bandwidth and slew rate. it features reduced input offset voltage, lower input bias currents, lower noise and higher dc gain than devices with comparable bandwidth and slew rate. the circuit is a single gain stage that includes proprietary dc gain enhancement circuitry to obtain precision with high speed. the high gain and fast settling time make the circuit an ideal choice for data acquisition systems. the circuit is also capable of driving capacitive loads which makes it useful in buffer or cable driver applications. the compen- sation node can also be used to clamp the output swing. the LT1222 is a member of a family of fast, high perfor- mance amplifiers that employ linear technology corporations advanced complementary bipolar process- ing. for unity-gain stable applications the lt1220 can be used, and for gains of 4 or greater the lt1221 can be used. n wideband amplifiers n buffers n active filters n video and rf amplification n cable drivers n 8-, 10-, 12-bit data acquisition systems a v = 10 with output clamping a v = C 1, c c = 30pf pulse response LT1222 ? ta02 r f = r g = 1k v s = 15v LT1222 ?ta01 v in LT1222 1n5711 1n5711 v out 0.5v 909 w 100 w + 1n4148 0.1 m f 5 6 3 2 3k 15v v in = 100mv f = 5mhz , ltc and lt are registered trademarks of linear technology corporation c-load is a trademark of linear technology corporation
2 LT1222 electrical characteristics a u g w a w u w a r b s o lu t exi t i s total supply voltage (v + to v C ) ............................. 36v differential input voltage ........................................ 6v input voltage .......................................................... v s output short-circuit duration (note 2) ........... indefinite specified temperature range LT1222c (note 3) ................................... 0 c to 70 c LT1222i ...............................................C40 c to 85 c LT1222m (obsolete) ............... C55 c to 125 c operating temperature range LT1222c ........................................... C 40 c to 85 c LT1222i ...............................................C40 c to 85 c LT1222m (obsolete) ............... C55 c to 125 c maximum junction temperature (see below) plastic package ............................................... 150 c ceramic package (obsolete) .................. 175 c storage temperature range ................ C 65 c to 150 c lead temperature (soldering, 10 sec)................. 300 c wu u package / o rder i for atio consult ltc marketing for parts specified with wider operating temperature ranges. LT1222cn8 LT1222cs8 LT1222is8 order part number 1 2 3 4 8 7 6 5 top view null ?n +in v null v + v out nc n8 package 8-lead plastic dip s8 package 8-lead plastic soic j8 package 8-lead ceramic dip t jmax = 150 c, q ja = 130 c/w (n) t jmax = 150 c, q ja = 190 c/w (s) s8 part marking 1222 1222i order part number special order consult factory t jmax = 175 c, q ja = 150 c/w top view v + null null ?n v out nc +in v 8 7 6 5 3 2 1 4 h package 8-lead to-5 metal can t a = 25 c, v s = 15v, v cm = 0v, unless otherwise specified. (note 1) t jmax = 175 c, q ja = 100 c/w (j) obsolete package consider the n8 or s8 packages for alternate source LT1222mj8 obsolete package consider the n8 or s8 packages for alternate source order part number symbol parameter conditions min typ max units v os input offset voltage (note 4) 100 300 m v i os input offset current 100 300 na i b input bias current 100 300 na e n input noise voltage f = 10khz 3 nv/ ? hz i n input noise current f = 10khz 2 pa/ ? hz r in input resistance v cm = 12v 20 45 m w differential 12 k w c in input capacitance 2pf input voltage range (positive) 12 14 v input voltage range (negative) C 13 C 12 v cmrr common mode rejection ratio v cm = 12v 100 120 db psrr power supply rejection ratio v s = 5v to 15v 98 110 db a vol large-signal voltage gain v out = 10v, r l = 500 w 100 200 v/mv v out output swing r l = 500 w 12 13 v i out output current v out = 12v 24 26 ma sr slew rate (note 5) 150 200 v/ m s full power bandwidth 10v peak (note 6) 3.2 mhz gbw gain-bandwidth f = 1mhz 500 mhz
3 LT1222 symbol parameter conditions min typ max units t r , t f rise time, fall time a v = 10, 10% to 90%, 0.1v 2.4 ns overshoot a v = 10, 0.1v 43 % propagation delay a v = 10, 50% v in to 50% v out , 0.1v 5.2 ns t s settling time 10v step, 0.1% 75 ns 10v step, 0.01% 120 ns differential gain a v = 2, c c = 50pf, f = 3.58mhz, r l = 150 w (note 7) 0.40 % a v = 10, c c = 0pf, f = 3.58mhz, r l = 1k (note 7) 0.15 % differential phase a v = 2, c c = 50pf, f = 3.58mhz, r l = 150 w (note 7) 0.10 deg a v = 10, c c = 0pf, f = 3.58mhz, r l = 1k (note 7) 0.01 deg r o output resistance a v = 10, f = 1mhz 0.1 w i s supply current 8 10.5 ma electrical characteristics v s = 15v, t a = 25 c, v cm = 0v, unless otherwise specified. symbol parameter conditions min typ max units v os input offset voltage (note 4) l 100 600 m v input v os drift l 5 m v/ c i os input offset current l 100 400 na i b input bias current l 100 400 na cmrr common mode rejection ratio v cm = 12v l 100 120 db psrr power supply rejection ratio v s = 5v to 15v l 98 110 db a vol large-signal voltage gain v out = 10v, r l = 500 w l 100 200 v/mv v out output swing r l = 500 w l 12 13 v i out output current v out = 12v l 24 26 ma sr slew rate (note 5) l 150 200 v/ m s i s supply current l 811 ma symbol parameter conditions min typ max units v os input offset voltage (note 4) l 100 600 m v input v os drift l 5 m v/ c i os input offset current l 100 800 na i b input bias current l 100 1000 na cmrr common mode rejection ratio v cm = 12v l 98 120 db psrr power supply rejection ratio v s = 5v to 15v l 98 110 db a vol large-signal voltage gain v out = 10v, r l = 500 w l 50 200 v/mv v out output swing r l = 500 w l 10 13 v r l = 1k l 12 13 v i out output current v out = 10v l 20 26 ma v out = 12v l 12 13 ma sr slew rate (note 5) l 110 200 v/ m s i s supply current l 811 ma note 1: absolute maximum ratings are those values beyond which the life of a device may be impaired. note 2: a heat sink may be required when the output is shorted indefinitely. note 3: the LT1222c is guaranteed to meet specified performance from 0 c to 70 c and is designed, characterized and expected to meet these extended temperature limits, but is not tested at C40 c and 85 c. the LT1222i is guaranteed to meet the extended temperature limits. note 4: input offset voltage is pulse tested and is exclusive of warm-up drift. note 5: slew rate is measured between 10v on an output swing of 12v. note 6: fpbw = sr/2 p v p . note 7: differential gain and phase are tested with five amps in series. attenuators of 1/gain are used as loads. the l denotes the specifications which apply over the temperature range 0 c t a 70 c, otherwise specifications are at t a = 25 c. v s = 15v, v cm = 0v, unless otherwise specified. the l denotes the specifications which apply over the temperature range C 55 c t a 125 c for LT1222m, C40 c t a 85 c for LT1222i, otherwise specifications are at t a = 25 c. v s = 15v, v cm = 0v, unless otherwise specified.
4 LT1222 typical perfor m a n ce characteristics u w input common mode range vs supply voltage output voltage swing vs resistive load output short-circuit current vs temperature power supply rejection ratio vs frequency open-loop gain vs resistive load output voltage swing vs supply voltage supply current vs supply voltage and temperature input bias current vs input common mode voltage input noise spectral density supply voltage (v) 0 0 magnitude of input voltage (v) 5 10 15 20 5101520 LT1222 ?tpc01 t a = 25? d v os = 0.5mv +v cm ? cm supply voltage (?) 0 5 supply current (ma) 6 7 8 9 10 11 5101520 LT1222 ?tpc02 t = 125? t = 25? t = 55? 0 0 magnitude of output volatge (v) 5 10 15 20 5101520 LT1222 ?tpc03 +v sw ? sw supply voltage (v) t a = 25? r l = 500 w d v os = 30mv load resistance ( w ) 10 0 output voltage swing (v p-p ) 10 20 25 30 100 1k 10k LT1222 ?tpc04 5 15 5v supplies 15v supplies t a = 25? d v os = 30mv input common mode voltage (v) ?5 500 input bias current (na) 0 500 05 15 LT1222 ?tpc05 ?0 5 10 400 300 200 100 100 200 300 400 i b + i b v s = 15v t a = 25 c load resistance ( w ) 10 70 open-loop gain (db) 80 100 110 120 100 1k 10k LT1222 ?tpc06 90 v s = ?v v s = ?5v t a = 25? temperature (?) ?0 20 output short-circuit current (ma) 30 35 45 50 25 50 100 125 LT1222 ?tpc07 25 40 025 75 v s = 5v frequency (hz) input voltage noise (nv/ ? hz) 100 10 1000 10 1k 10k 100k LT1222 ?tpc08 1 100 input current noise (pa/ ? hz) 10 1 100 0.1 v s = ?5v t a = 25? a v = 101 r s = 100k e n i n frequency (hz) 100 0 power supply rejection ratio (db) 20 40 60 80 100 120 1k 100k 10m 100m LT1222 ?tpc09 10k 1m v s = ?5v t a = 25? psrr +psrr
5 LT1222 typical perfor m a n ce characteristics u w common mode rejection ratio vs frequency voltage gain and phase vs frequency total harmonic distortion vs frequency slew rate vs temperature closed-loop output impedance vs frequency output swing and error vs settling time (inverting) output swing and error vs settling time (noninverting) gain-bandwidth vs temperature frequency response vs capacitive load frequency (hz) 1k 0 common mode rejection ratio (db) 20 40 60 80 100 120 100k 10m 100m LT1222 ?tpc10 10k 1m v s = 15v t a = 25 c settling time (ns) 0 output swing (v) 2 6 10 100 LT1222 ?tpc11 ? ? 0 4 8 ? ? ?0 25 50 75 125 10mv 10mv 1mv 1mv v s = ?5v t a = 25? settling time (ns) 0 output swing (v) 2 6 10 100 LT1222 ?tpc12 ? ? 0 4 8 ? ? ?0 25 50 75 125 10mv 10mv 1mv 1mv v s = ?5v t a = 25? 40 80 120 100 frequency (hz) 100 0 voltage gain (db) 60 10k 1m 100m LT1222 ?tpc13 1k 100k v s = ?5v 20 10m 20 60 100 80 ?0 phase margin (deg) 40 0 v s = ?v v s = ?5v v s = ?v t a = 25? 16 24 30 28 frequency (mhz) 1 10 voltage magnitude (db) 20 100 LT1222 ?tpc14 10 14 12 18 22 26 c = 1000pf c = 100pf c = 0 v s = ?5v t a = 25? a v = ?0 c = 50pf c = 500pf frequency (hz) 0.01 output impedance ( w ) 0.1 1 10 10k 1m 10m 100m LT1222 ?tpc15 0.001 100k v s = ?5v t a = 25? a v = 10 550 temperature (?) ?0 400 gain-bandwidth (mhz) 125 LT1222 ?tpc16 0 425 475 525 ?5 75 v s = ?5v 500 450 25 50 100 275 temperature (?) ?0 125 slew rate (v/ m s) 125 LT1222 ?tpc17 0 150 200 250 ?5 75 225 175 25 50 100 v s = ?5v a v = ?0 c c = 0 sr = (sr + ) + (sr ) 2 frequency (hz) 10 100 0.0001 total harmonic distortion and noise (%) 0.001 0.01 1k 10k 100k LT1222 ?tpc18 v s = ?5v v o = 3v rms r l = 500 w a v = 10
6 LT1222 typical perfor m a n ce characteristics u w large signal, a v = 10 small signal, a v = 10 r f = 909 w r g = 100 w LT1222 ? tpc19 LT1222 ? tpc20 large signal, a v = 10, c l = 10,000pf LT1222 ? tpc21 small signal, a v = C 10 LT1222 ? tpc22 LT1222 ? tpc23 LT1222 ? tpc24 large signal, a v = C 10 small signal, a v = C 10, c l = 1,000pf r f = 909 w r g = 100 w r f = 1k r g = 100 w (75) r f = 1k r g = 100 w (75) v s = 15v v in = 20mv f = 5mhz v s = 15v v in = 20mv f = 5mhz v s = 15v v in = 2v f = 2mhz v s = 15v v in = 2v f = 2mhz applicatio n s i n for m atio n wu u u the LT1222 is stable in noise gains of 10 or greater and may be inserted directly into ha2520/2/5, ha2541/2/4, ad817, ad847, el2020, el2044 and lm6361 applica- tions, provided that the nulling circuitry is removed and the amplifier configuration has a high enough noise gain. the suggested nulling circuit for the LT1222 is shown in the following figure. layout and passive components the LT1222 amplifier is easy to apply and tolerant of less than ideal layouts. for maximum performance (for ex- ample, fast settling time) use a ground plane, short lead lengths and rf-quality bypass capacitors (0.01 m f to 0.1 m f). for high drive current applications use low esr bypass capacitors (1 m f to 10 m f tantalum). sockets should be avoided when maximum frequency performance is re- quired. for more details see design note 50. feedback resistors greater than 5k are not recommended because a pole is formed with the input capacitance which can cause peaking or oscillations. stray capacitance on pin 5 should be minimized. bias current cancellation circuitry is em- ployed on the inputs of the LT1222 so the input bias current and input offset current have identical specifications. for this reason, matching the impedance on the inputs to reduce bias current errors is not necessary. offset nulling LT1222 ?ai01 v + v 0.1 m f 0.1 m f 5k 3 2 4 7 6 8 1 LT1222 + r f = 909 w r g = 100 w v s = 15v v in = 2v f = 20khz r f = 1k r g = 100 w (75) v s = 15v v in = 15mv f = 500khz
7 LT1222 applicatio n s i n for m atio n wu u u output clamping access to the internal compensation node at pin 5 allows the output swing of the LT1222 to be clamped. an example is shown on the first page of this data sheet. the compen- sation node is approximately one diode drop above the output and can source or sink 1.2ma. back-to-back schot- tky diodes clamp pin 5 to a diode drop above ground so the output is clamped to 0.5v (the drop of the schottkys at 1.2ma). the diode reference is bypassed for good ac response. this circuit is useful for amplifying the voltage at false sum nodes used in settling time measurements. capacitive loading the LT1222 is stable with capacitive loads. this is accom- plished by sensing the load induced output pole and adding compensation at the amplifier gain node. as the capacitive load increases, both the bandwidth and phase margin decrease. there will be peaking in the frequency domain as shown in the curve of frequency response vs capacitive load. the small-signal transient response will have more overshoot as shown in the photo of the small-signal response with 1000pf load. the large-signal response with a 10,000pf load shows the output slew rate being limited to 4v/ m s by the short-circuit current. the LT1222 can drive coaxial cable directly, but for best pulse fidelity a resistor of value equal to the characteristic impedance of the cable (i.e., 75 w ) should be placed in series with the output. the other end of the cable should be terminated with the same value resistor to ground. compensation the LT1222 has a typical gain-bandwidth product of 500mhz which allows it to have wide bandwidth in high gain configurations (i.e., in a gain of 100, it will have a bandwidth of about 5mhz). for added flexibility the ampli- fier frequency response may be adjusted by adding capaci- tance from pin 5 to ground. the compensation capacitor may be used to reduce overshoot, to allow the amplifier to be used in lower noise gains, or simply to reduce band- width. table 1 shows gain and compensation capacitor vresus C 3db bandwidth, maximum frequency peaking and small-signal overshoot. table 1 a v c c (pf) f C 3db (mhz) max peaking (db) overshoot (%) C 1 30 99 4.2 36 C 1 50 70 0.9 13 C 1 82 32 0 0 C 1 150 13 0 0 5 10 140 3.8 35 5 20 100 0 5 530 34 0 1 550 15 0 0 10 0 150 9.5 45 10 5 111 0.2 10 10 10 40 0 2 10 20 17 0 0 20 0 82 0.1 10 20 5 24 0 0 20 10 14 0 0 for frequencies < 10mhz the frequency response of the amplifier is approximately: f = 1/[2 p ? 53 w ? (c c + 6pf) ? (noise gain)] the slew rate is affected as follows: sr = 1.2ma /(c c + 6pf) an example would be a gain of C10 (noise gain of 11) and c c = 20pf which has 10.5mhz bandwidth and 46v/ m s slew rate. it should be noted that the LT1222 is not stable in a v = 1 unless c c = 50pf and a 1k resistor is used as the feedback resistor. the 1k and input capacitance increase the noise gain at frequency to aid stability.
8 LT1222 typical applicatio n s n u v os null loop LT1222 ?ta03 in v 100pf LT1222 10k 100pf + lt1097 + 10k v out a v = 1001 25k 25 w 150k 1 8 150k two op amp instrumemtation amplifier + + lt1220 gain = [r4/r3][1 + (1/2)(r2/r1 + r3/r4) + (r2 + r3)/r5] = 102 trim r5 for gain trim r1 for common mode rejection bw = 3mhz v in v out + LT1222 LT1222 ?ta04 r3 1k r5 220 w r4 10k r2 1k r1 10k si plified sche atic ww 6 out LT1222 ?ss bias 2 comp bias 1 18 5 null ?n +in 3 v 7 v + 2 4
9 LT1222 package descriptio n u h package 8-lead to-5 metal can (.200 inch pcd) (reference ltc dwg # 05-08-1320) j8 package 8-lead cerdip (narrow .300 inch, hermetic) (reference ltc dwg # 05-08-1110) j8 1298 0.014 ?0.026 (0.360 ?0.660) 0.200 (5.080) max 0.015 ?0.060 (0.381 ?1.524) 0.125 3.175 min 0.100 (2.54) bsc 0.300 bsc (0.762 bsc) 0.008 ?0.018 (0.203 ?0.457) 0 ?15 0.005 (0.127) min 0.405 (10.287) max 0.220 ?0.310 (5.588 ?7.874) 12 3 4 87 65 0.025 (0.635) rad typ 0.045 ?0.068 (1.143 ?1.727) full lead option 0.023 ?0.045 (0.584 ?1.143) half lead option corner leads option (4 plcs) 0.045 ?0.065 (1.143 ?1.651) note: lead dimensions apply to solder dip/plate or tin plate leads 0.050 (1.270) max 0.016 ?0.021** (0.406 ?0.533) 0.010 ?0.045* (0.254 ?1.143) seating plane 0.040 (1.016) max 0.165 ?0.185 (4.191 ?4.699) gauge plane reference plane 0.500 ?0.750 (12.700 ?19.050) 0.305 ?0.335 (7.747 ?8.509) 0.335 ?0.370 (8.509 ?9.398) dia h8(to-5) 0.200 pcd 1197 lead diameter is uncontrolled between the reference plane and 0.045" below the reference plane for solder dip lead finish, lead diameter is 0.016 ?0.024 (0.406 ?0.610) * ** 0.200 (5.080) typ 0.027 ?0.045 (0.686 ?1.143) 0.028 ?0.034 (0.711 ?0.864) 0.110 ?0.160 (2.794 ?4.064) insulating standoff 45 typ pin 1 obsolete packages
10 LT1222 package descriptio n u n8 package 8-lead pdip (narrow .300 inch) (reference ltc dwg # 05-08-1510) n8 1098 0.100 (2.54) bsc 0.065 (1.651) typ 0.045 ?0.065 (1.143 ?1.651) 0.130 0.005 (3.302 0.127) 0.020 (0.508) min 0.018 0.003 (0.457 0.076) 0.125 (3.175) min 12 3 4 87 6 5 0.255 0.015* (6.477 0.381) 0.400* (10.160) max 0.009 ?0.015 (0.229 ?0.381) 0.300 ?0.325 (7.620 ?8.255) 0.325 +0.035 0.015 +0.889 0.381 8.255 () *these dimensions do not include mold flash or protrusions. mold flash or protrusions shall not exceed 0.010 inch (0.254mm)
11 LT1222 package descriptio n u information furnished by linear technology corporation is believed to be accurate and reliable. however, no responsibility is assumed for its use. linear technology corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. s8 package 8-lead plastic small outline (narrow .150 inch) (reference ltc dwg # 05-08-1610) 0.016 ?0.050 (0.406 ?1.270) 0.010 ?0.020 (0.254 ?0.508) 45 0 ?8 typ 0.008 ?0.010 (0.203 ?0.254) so8 1298 0.053 ?0.069 (1.346 ?1.752) 0.014 ?0.019 (0.355 ?0.483) typ 0.004 ?0.010 (0.101 ?0.254) 0.050 (1.270) bsc 1 2 3 4 0.150 ?0.157** (3.810 ?3.988) 8 7 6 5 0.189 ?0.197* (4.801 ?5.004) 0.228 ?0.244 (5.791 ?6.197) dimension does not include mold flash. mold flash shall not exceed 0.006" (0.152mm) per side dimension does not include interlead flash. interlead flash shall not exceed 0.010" (0.254mm) per side * **
12 LT1222 ? linear technology corporation 1992 1222fb lt/cp 0801 1.5k rev b ? printed in usa linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 l fax: (408) 434-0507 l www.linear.com related parts part number description comments lt1220 45mhz, 250v/ m s amplifier unity gain stable version of the LT1222 lt1221 150mhz, 250v/ m s amplifier a v 3 4 version of the LT1222

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