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1 LTC1563-2/ltc1563-3 n extremely easy to usea single resistor value sets the cutoff frequency (256hz < f c < 256khz) n extremely flexibledifferent resistor values allow arbitrary transfer functions with or without gain (256hz < f c < 256khz) n supports cutoff frequencies up to 360khz using filtercad tm n LTC1563-2: unity-gain butterworth response uses a single resistor value, different resistor values allow other responses with or without gain n ltc1563-3: unity-gain bessel response uses a single resistor value, different resistor values allow other responses with or without gain n rail-to-rail input and output voltages n operates from a single 3v (2.7v min) to 5v supply n low noise: 36 m v rms for f c = 25.6khz, 60 m v rms for f c = 256khz n f c accuracy < 2% (typ) n dc offset < 1mv n cascadable to form 8th order lowpass filters the ltc ? 1563-2/ltc1563-3 are a family of extremely easy-to-use, active rc lowpass filters with rail-to-rail inputs and outputs and low dc offset suitable for systems with a resolution of up to 16 bits. the LTC1563-2, with a single resistor value, gives a unity-gain butterworth response. the ltc1563-3, with a single resistor value, gives a unity-gain bessel response. the proprietary architecture of these parts allows for a simple resistor calculation: r = 10k (256khz/f c ); f c = cutoff frequency where f c is the desired cutoff frequency. for many appli- cations, this formula is all that is needed to design a filter. by simply utilizing different valued resistors, gain and other responses are achieved. the ltc1563-x features a low power mode, for the lower frequency applications, where the supply current is re- duced by an order of magnitude and a near zero power shutdown mode. the ltc1563-xs are available in the narrow ssop-16 package (so-8 footprint). n replaces discrete rc active filters and modules n antialiasing filters n smoothing or reconstruction filters n linear phase filtering for data communication n phase locked loops single 3.3v, 256hz to 256khz butterworth lowpass filter active rc, 4th order lowpass filter family , ltc and lt are registered trademarks of linear technology corporation. 0.1 f 3.3v v out v in r r r r r r f c = 256khz 1563 ta01 LTC1563-2 0.1 f 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 lp sa nc inva nc lpa agnd v v + lpb nc invb nc sb nc en 10k r () frequency (hz) 10k 1k 100 gain (db) 10 0 ?0 ?0 ?0 ?0 ?0 ?0 ?0 ?0 100k 1m 1563 ta02 r = 10m f c = 256hz r = 10k f c = 256khz frequency response applicatio s u features typical applicatio u descriptio u filtercad is trademark of linear technology corporation.
2 LTC1563-2/ltc1563-3 LTC1563-2cgn ltc1563-3cgn LTC1563-2ign ltc1563-3ign t jmax = 150 c, q ja = 135 c/ w order part number total supply voltage (v + to v C ) ............................... 11v maximum input voltage at any pin ....................... (v C C 0.3v) v pin (v + + 0.3v) power dissipation .............................................. 500mw operating temperature range ltc1563c ............................................... 0 c to 70 c ltc1563i ............................................ C 40 c to 85 c storage temperature range ................. C 65 c to 150 c lead temperature (soldering, 10 sec).................. 300 c (note 1) absolute m axi m u m ratings w ww u package/order i n for m atio n w u u electrical characteristics top view gn package 16-lead plastic ssop 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 lp sa nc inva nc lpa agnd v v + lpb nc invb nc sb nc en note: pins labeled nc are not connected internally and should be connected to the system ground the l denotes specifications which apply over the full operating temperature range, otherwise specifications are t a = 25 c. v s = single 4.75v, en pin to logic low, gain = 1, r fil = r11 = r21 = r31 = r12 = r22 = r32, specifications apply to both the high speed (hs) and low power (lp) modes unless otherwise noted. consult factory for military grade parts. parameter conditions min typ max units specifications for both LTC1563-2 and ltc1563-3 total supply voltage (v s ), hs mode l 311v total supply voltage (v s ), lp mode l 2.7 11 v output voltage swing high (lpb pin) v s = 3v, f c = 25.6khz, r fil = 100k, r l = 10k to gnd l 2.9 2.95 v hs mode v s = 4.75v, f c = 25.6khz, r fil = 100k, r l = 10k to gnd l 4.55 4.7 v v s = 5v, f c = 25.6khz, r fil = 100k, r l = 10k to gnd l 4.8 4.9 v output voltage swing low (lpb pin) v s = 3v, f c = 25.6khz, r fil = 100k, r l = 10k to gnd l 0.015 0.05 v hs mode v s = 4.75v, f c = 25.6khz, r fil = 100k, r l = 10k to gnd l 0.02 0.05 v v s = 5v, f c = 25.6khz, r fil = 100k, r l = 10k to gnd l C 4.95 C 4.9 v output swing high (lpb pin) v s = 2.7v, f c = 25.6khz, r fil = 100k, r l = 10k to gnd l 2.6 2.65 v lp mode v s = 4.75v, f c = 25.6khz, r fil = 100k, r l = 10k to gnd l 4.55 4.65 v v s = 5v, f c = 25.6khz, r fil = 100k, r l = 10k to gnd l 4.8 4.9 v output swing low (lpb pin) v s = 2.7v, f c = 25.6khz, r fil = 100k, r l = 10k to gnd l 0.01 0.05 v lp mode v s = 4.75v, f c = 25.6khz, r fil = 100k, r l = 10k to gnd l 0.015 0.05 v v s = 5v, f c = 25.6khz, r fil = 100k, r l = 10k to gnd l C 4.95 C 4.9 v dc offset voltage, hs mode v s = 3v, f c = 25.6khz, r fil = 100k l 1.5 3mv (section a only) v s = 4.75v, f c = 25.6khz, r fil = 100k l 1.0 3mv v s = 5v, f c = 25.6khz, r fil = 100k l 1.5 3mv dc offset voltage, lp mode v s = 2.7v, f c = 25.6khz, r fil = 100k l 2 4mv (section a only) v s = 4.75v, f c = 25.6khz, r fil = 100k l 2 4mv v s = 5v, f c = 25.6khz, r fil = 100k l 2 5mv dc offset voltage, hs mode v s = 3v, f c = 25.6khz, r fil = 100k l 1.5 3mv (input to output, sections a, b cascaded) v s = 4.75v, f c = 25.6khz, r fil = 100k l 1.0 3mv v s = 5v, f c = 25.6khz, r fil = 100k l 1.5 3mv dc offset voltage, lp mode v s = 2.7v, f c = 25.6khz, r fil = 100k l 2 5mv (input to output, sections a, b cascaded) v s = 4.75v, f c = 25.6khz, r fil = 100k l 2 5mv v s = 5v, f c = 25.6khz, r fil = 100k l 2 6mv 15632 15633 15632i 15633i gn part marking
3 LTC1563-2/ltc1563-3 electrical characteristics parameter conditions min typ max units dc offset voltage drift, hs mode v s = 3v, f c = 25.6khz, r fil = 100k l 10 m v/ c (input to output, sections a, b cascaded) v s = 4.75v, f c = 25.6khz, r fil = 100k l 10 m v/ c v s = 5v, f c = 25.6khz, r fil = 100k l 10 m v/ c dc offset voltage drift, lp mode v s = 2.7v, f c = 25.6khz, r fil = 100k l 10 m v/ c (input to output, sections a, b cascaded) v s = 4.75v, f c = 25.6khz, r fil = 100k l 10 m v/ c v s = 5v, f c = 25.6khz, r fil = 100k l 10 m v/ c agnd voltage v s = 4.75v, f c = 25.6khz, r fil = 100k l 2.35 2.375 2.40 v power supply current, hs mode v s = 3v, f c = 25.6khz, r fil = 100k l 8.0 14 ma v s = 4.75v, f c = 25.6khz, r fil = 100k l 10.5 17 ma v s = 5v, f c = 25.6khz, r fil = 100k l 15 23 ma power supply current, lp mode v s = 2.7v, f c = 25.6khz, r fil = 100k l 1.0 1.8 ma v s = 4.75v, f c = 25.6khz, r fil = 100k l 1.4 2.5 ma v s = 5v, f c = 25.6khz, r fil = 100k l 2.3 3.5 ma shutdown mode supply current v s = 4.75v, f c = 25.6khz, r fil = 100k l 120 m a en input v s = 3v l 0.8 v logic low level v s = 4.75v l 1v v s = 5v l 1v en input v s = 3v l 2.5 v logic high level v s = 4.75v l 4.3 v v s = 5v l 4.4 v lp v s = 3v l 0.8 v logic low level v s = 4.75v l 1v v s = 5v l 1v lp v s = 3v l 2.5 v logic high level v s = 4.75v l 4.3 v v s = 5v l 4.4 v LTC1563-2 transfer function characteristics cutoff frequency range, f c v s = 3v l 0.256 256 khz hs mode v s = 4.75v l 0.256 256 khz (note 2) v s = 5v l 0.256 256 khz cutoff frequency range, f c v s = 2.7v l 0.256 25.6 khz lp mode v s = 4.75v l 0.256 25.6 khz (note 2) v s = 5v l 0.256 25.6 khz cutoff frequency accuracy, hs mode v s = 3v, r fil = 100k l C2.0 1.5 3.5 % f c = 25.6khz v s = 4.75v, r fil = 100k l C2.0 1.5 3.5 % v s = 5v, r fil = 100k l C2.0 1.5 3.5 % cutoff frequency accuracy, hs mode v s = 3v, r fil = 10k l C5 1.5 1.5 % f c = 256khz v s = 4.75v, r fil = 10k l C5 1.5 1.5 % v s = 5v, r fil = 10k l C5 1.5 1.5 % cutoff frequency accuracy, lp mode v s = 2.7v, r fil = 100k l C3 1.5 3 % f c = 25.6khz v s = 4.75v, r fil = 100k l C3 1.5 3 % v s = 5v, r fil = 100k l C3 1.5 3 % cutoff frequency temperature coefficient (note 3) l 1 ppm/ c passband gain, hs mode, f c = 25.6khz test frequency = 2.56khz (0.1 ? f c ) l C 0.2 0 0.2 db v s = 4.75v, r fil = 100k test frequency = 12.8khz (0.5 ? f c ) l C 0.3 0 0.3 db the l denotes specifications which apply over the full operating temperature range, otherwise specifications are t a = 25 c. v s = single 4.75v, en pin to logic low, gain = 1, r fil = r11 = r21 = r31 = r12 = r22 = r32, specifications apply to both the high speed (hs) and low power (lp) modes unless otherwise noted.
4 LTC1563-2/ltc1563-3 electrical characteristics parameter conditions min typ max units stopband gain, hs mode, f c = 25.6khz test frequency = 51.2khz (2 ? f c ) l C 24 C 21.5 d b v s = 4.75v, r fil = 100k test frequency = 102.4khz (4 ? f c ) l C48 C46 db passband gain, hs mode, f c = 256khz test frequency = 25.6khz (0.1 ? f c ) l C 0.2 0 0.2 db v s = 4.75v, r fil = 10k test frequency = 128khz (0.5 ? f c ) l C 0.5 0 0.5 db stopband gain, hs mode, f c = 256khz test frequency = 400khz (1.56 ? f c ) l C 15.7 C13.5 db v s = 4.75v, r fil = 10k test frequency = 500khz (1.95 ? f c ) l C 23.3 C 21.5 db passband gain, lp mode, f c = 25.6khz test frequency = 2.56khz (0.1 ? f c ) l C 0.25 0 0.25 db v s = 4.75v, r fil = 100k test frequency = 12.8khz (0.5 ? f c ) l C 0.6 C 0.02 0.6 db stopband gain, lp mode, f c = 25.6khz test frequency = 51.2khz (2 ? f c ) l C24 C22 db v s = 4.75v, r fil = 100k test frequency = 102.4khz (4 ? f c ) l C 48 C 46.5 db ltc1563-3 transfer function characteristics cutoff frequency range, f c v s = 3v l 0.256 256 khz hs mode v s = 4.75v l 0.256 256 khz (note 2) v s = 5v l 0.256 256 khz cutoff frequency range, f c v s = 2.7v l 0.256 25.6 khz lp mode v s = 4.75v l 0.256 25.6 khz (note 2) v s = 5v l 0.256 25.6 khz cutoff frequency accuracy, hs mode v s = 3v, r fil = 100k l C3 2 5.5 % f c = 25.6khz v s = 4.75v, r fil = 100k l C3 2 5.5 % v s = 5v, r fil = 100k l C3 2 5.5 % cutoff frequency accuracy, hs mode v s = 3v, r fil = 10k l C2 26 % f c = 256khz v s = 4.75v, r fil = 10 l C2 26 % v s = 5v, r fil = 10k l C2 26 % cutoff frequency accuracy, lp mode v s = 2.7v, r fil = 100k l C4 37 % f c = 25.6khz v s = 4.75v, r fil = 100k l C4 37 % v s = 5v, r fil = 100k l C4 37 % cutoff frequency temperature coefficient (note 3) l 1 ppm/ c passband gain, hs mode, f c = 25.6khz test frequency = 2.56khz (0.1 ? f c ) l C 0.2 C 0.03 0.2 db v s = 4.75v, r fil = 100k test frequency = 12.8khz (0.5 ? f c ) l C1.0 C 0.72 C 0.25 db stopband gain, hs mode, f c = 25.6khz test frequency = 51.2khz (2 ? f c ) l C13.6 C10 db v s = 4.75v, r fil = 100k test frequency = 102.4khz (4 ? f c ) l C 34.7 C 31 db passband gain, hs mode, f c = 256khz test frequency = 25.6khz (0.1 ? f c ) l C 0.2 C 0.03 0.2 db v s = 4.75v, r fil = 10k test frequency = 128khz (0.5 ? f c ) l C1.1 C 0.72 C 0.5 db stopband gain, hs mode, f c = 256khz test frequency = 400khz (1.56 ? f c ) l C 8.3 C 6 db v s = 4.75v, r fil = 10k test frequency = 500khz (1.95 ? f c ) l C 13 C10.5 db passband gain, lp mode, f c = 25.6khz test frequency = 2.56khz (0.1 ? f c ) l C 0.2 C 0.03 0.2 db v s = 4.75v, r fil = 100k test frequency = 12.8khz (0.5 ? f c ) l C1.0 C 0.72 C 0.25 db stopband gain, lp mode, f c = 25.6khz test frequency = 51.2khz (2 ? f c ) l C 13.6 C11 db v s = 4.75v, r fil = 100k test frequency = 102.4khz (4 ? f c ) l C 34.7 C 32 db note 1: absolute maximum ratings are those value beyond which the life of a device may be impaired. note 2: the minimum cutoff frequency of the ltc1563 is arbitrarily listed as 256hz. the limit is arrived at by setting the maximum resistor value limit at 10m w . the ltc1563 can be used with even larger valued resistors. when using very large values of resistance careful layout and thorough assembly practices are required. there may also be greater dc offset at high temperatures when using such large valued resistors. the l denotes specifications which apply over the full operating temperature range, otherwise specifications are t a = 25 c. v s = single 4.75v, en pin to logic low, gain = 1, r fil = r11 = r21 = r31 = r12 = r22 = r32, specifications apply to both the high speed (hs) and low power (lp) modes unless otherwise noted. note 3: the cutoff frequency temperature drift at low frequencies is as listed. at higher cutoff frequencies (approaching 25.6khz in low power mode and approaching 256khz in high speed mode) the internal amplifiers bandwidth can effect the cutoff frequency. at these limits the cutoff frequency temperature drift is 15ppm/ c.
5 LTC1563-2/ltc1563-3 typical perfor a ce characteristics uw output voltage swing high vs load resistance output voltage swing high vs load resistance output voltage swing high vs load resistance output voltage swing low vs load resistance output voltage swing low vs load resistance output voltage swing low vs load resistance thd + noise vs input voltage thd + noise vs input voltage thd + noise vs input voltage load resistance?oad to ground ( w ) 100 output voltage (v) 3.4 3.2 3.0 2.8 2.6 2.4 2.2 2.0 1k 10k 100k 1563 g01 v s = single 3.3v lp mode hs mode load resistance?oad to ground ( w ) 100 output voltage (v) 5.5 5.0 4.5 4.0 3.5 3.0 2.5 1k 10k 100k 1563 g02 hs mode lp mode v s = single 5v load resistance?oad to ground ( w ) 100 output voltage (v) 5.5 5.0 4.5 4.0 3.5 3.0 2.5 1k 10k 100k 1563 g03 hs mode lp mode v s = 5v load resistance?oad to ground ( w ) 100 output voltage (v) 0.025 0.020 0.015 0.010 0.005 0 1k 10k 100k 1563 g04 hs mode lp mode v s = single 3.3v load resistance?oad to ground ( w ) 100 output voltage (v) 0.025 0.020 0.015 0.010 0.005 0 1k 10k 100k 1563 g05 hs mode lp mode v s = single 5v load resistance?oad to ground ( w ) 100 output voltage (v) 4.3 4.4 4.5 4.6 4.7 4.8 4.9 5.0 1k 10k 100k 1563 g06 v s = 5v hs mode lp mode input voltage (v p-p ) 0.1 (thd + noise)/signal (db) ?0 ?0 ?0 ?0 ?0 ?0 100 110 1563 g07 3.3v supply 5v supply 5v supply f c = 25.6khz low power mode f in = 5khz input voltage (v p-p ) 0.1 (thd + noise)/signal (db) ?0 ?0 ?0 ?0 ?0 ?0 100 110 1563 g08 3.3v supply 5v supply 5v supply f c = 25.6khz high speed mode f in = 5khz input voltage (v p-p ) 0.1 (thd + noise)/signal (db) ?0 ?0 ?0 ?0 ?0 ?0 100 110 1563 g09 3.3v supply 5v supply 5v supply f c = 256khz high speed mode f in = 50khz
6 LTC1563-2/ltc1563-3 thd + noise vs input frequency thd + noise vs input frequency thd + noise vs input frequency thd + noise vs input frequency thd + noise vs input frequency thd + noise vs input frequency thd + noise vs input frequency thd + noise vs input frequency thd + noise vs input frequency input frequency (khz) 1 (thd + noise)/signal (db) 10 1563 g10 ?0 ?0 ?0 ?0 100 20 1v p-p 2v p-p v s = single 3.3v low power mode f c = 25.6khz input frequency (khz) 1 (thd + noise)/signal (db) 10 1563 g11 ?0 ?0 ?0 ?0 100 20 1v p-p 2v p-p v s = single 3.3v high speed mode f c = 25.6khz ?0 ?0 ?0 ?0 ?0 ?0 100 input frequency (khz) 1 10 100 1563 g12 200 (thd + noise)/signal (db) 1v p-p 2v p-p v s = single 3v high speed mode f c = 256khz input frequency (khz) 1 (thd + noise)/signal (db) 10 1563 g13 ?0 ?0 ?0 ?0 100 20 1v p-p 2v p-p 3v p-p v s = single 5v low power mode f c = 25.6khz input frequency (khz) 1 (thd + noise)/signal (db) 10 1563 g14 ?0 ?0 ?0 ?0 100 20 1v p-p 2v p-p 3v p-p v s = single 5v high speed mode f c = 25.6khz ?0 ?0 ?0 ?0 ?0 ?0 100 input frequency (khz) 1 10 100 1563 g15 200 (thd + noise)/signal (db) 1v p-p 2v p-p 3v p-p v s = single 5v high speed mode f c = 256khz input frequency (khz) 1 (thd + noise)/signal (db) 10 1563 g16 ?0 ?0 ?0 ?0 100 20 1v p-p 2v p-p 5v p-p v s = 5v low power mode f c = 25.6khz input frequency (khz) 1 (thd + noise)/signal (db) 10 1563 g17 ?0 ?0 ?0 ?0 100 20 1v p-p 2v p-p 5v p-p v s = 5v high speed mode f c = 25.6khz ?0 ?0 ?0 ?0 ?0 ?0 100 input frequency (khz) 1 10 100 1563 g18 200 (thd + noise)/signal (db) 1v p-p 5v p-p 2v p-p v s = 5v high speed mode f c = 256khz typical perfor a ce characteristics uw
7 LTC1563-2/ltc1563-3 thd + noise vs output load thd + noise vs output load output voltage noise vs cutoff frequency thd + noise vs output load thd + noise vs output load stopband gain vs input frequency crosstalk rejection vs frequency crosstalk rejection vs frequency output load resistance?oad to ground (k ) 012345678910 (thd + noise)/signal (db) 1563 g19 ?0 ?5 ?0 ?5 ?0 ?5 100 lp mode, 3v p-p signal lp mode, 2v p-p signal hs mode, 3v p-p signal hs mode, 2v p-p signal v s = single 5v f c = 25.6khz f in = 5khz output load resistance?oad to ground (k ) 012345678910 (thd + noise)/signal (db) 1563 g20 ?0 ?5 ?0 ?5 ?0 ?5 100 v s = single 5v high speed mode f c = 256khz f in = 20khz, 50khz 3v p-p , 20khz 3v p-p , 50khz 2v p-p , 50khz 2v p-p , 20khz f c (hz) total integrated noise ( v rms ) 60 50 40 30 20 10 0k 0.1 10 100 1000 1563 g21 1 t a = 25 c hs mode lp mode output load resistance?oad to ground (k ) 012345678910 (thd + noise)/signal (db) 1563 g22 ?0 ?5 ?0 ?5 ?0 ?5 100 lp mode, 5v p-p signal lp mode, 2v p-p signal hs mode, 5v p-p signal hs mode, 2v p-p signal v s = 5v f c = 25.6khz f in = 5khz ?0 ?5 ?0 ?5 ?0 ?5 100 output load resistance?oad to ground (k ) 012345678910 (thd + noise)/signal (db) 1563 g23 5v p-p , 50khz 2v p-p , 20khz 2v p-p , 20khz 2v p-p , 50khz v s = 5v high speed mode f c = 256khz f in = 20khz, 50khz frequency (khz) 1 crosstalk (db) ?0 ?0 ?0 ?0 100 110 10 100 1563 g25 dual second order butterworth f c = 25.6khz hs or lp mode frequency (hz) 1k 10k 100k 1m 1563 g26 crosstalk (db) ?0 ?0 ?0 ?0 100 110 dual second order butterworth f c = 256khz high speed mode frequency (hz) gain (db) 10 0 ?0 ?0 ?0 ?0 ?0 ?0 ?0 ?0 ?0 10k 1m 10m 100m 1563 g24 100k ltc1563-3 LTC1563-2 f c = 256khz typical perfor a ce characteristics uw
8 LTC1563-2/ltc1563-3 lp (pin 1): low power. the ltc1563-x has two operating modes. most applications use the parts high speed operating mode. some lower frequency, lower gain appli- cations can take advantage of the low power mode. when placed in the low power mode, the supply current is nearly an order of magnitude lower than the high speed mode. refer to the applications information section for more information on the low power mode. the ltc1563-x is in the high speed mode when the lp input is at a logic high level or is open-circuited. a small pull-up current source at the lp input defaults the ltc1563-x to the high speed mode if the pin is left open. the part is in the low power mode when the pin is pulled to a logic low level or connected to v C . sa, sb (pins 2, 11): summing pins. these pins are a summing point for signals fed forward and backward. capacitance on the sa or sb pin will cause excess peaking of the frequency response near the cutoff frequency. the three external resistors for each section should be located as close as possible to the summing pin to minimize this effect. refer to the applications information section for more details. nc (pins 3, 5, 10, 12, 14): these pins are not connected internally. for best performance, they should be con- nected to ground. inva, invb (pins 4, 13): inverting input. each of the inv pins is an inverting input of an op amp. note that the inv pins are high impedance, sensitive nodes of the filter and very susceptible to coupling of unintended signals. capacitance on the inv nodes will also affect the fre- quency response of the filter sections. for these reasons, printed circuit connections to the inv pins must be kept as short as possible. pi n fu n ctio n s uuu lpa, lpb (pins 6, 15): lowpass output. these pins are the rail-to-rail outputs of an op amp. each output is designed to drive a nominal net load of 5k w and 20pf. refer to the applications information section for more details on output loading effects. agnd (pin 7): analog ground. the agnd pin is the midpoint of an internal resistive voltage divider developing a potential halfway between the v + and v C pins. the equivalent series resistance is nominally 10k w . this serves as an internal ground reference. filter performance will reflect the quality of the analog signal ground. an analog ground plane surrounding the package is recommended. the analog ground plane should be connected to any digital ground at a single point. figures 1 and 2 show the proper connections for dual and single supply operation. v C , v + (pins 8, 16): the v C and v + pins should be bypassed with 0.1 m f capacitors to an adequate analog ground or ground plane. these capacitors should be connected as closely as possible to the supply pins. low noise linear supplies are recommended. switching sup- plies are not recommended as they will decrease the filters dynamic range. refer to figures 1 and 2 for the proper connections for dual and single supply operation. en (pin 9): enable. when the en input goes high or is open-circuited, the ltc1563-x enters a shutdown state and only junction leakage currents flow. the agnd pin, the lpa output and the lpb output assume high impedance states. if an input signal is applied to a complete filter circuit while the ltc1563-x is in shutdown, some signal will normally flow to the output through passive compo- nents around the inactive part. a small internal pull-up current source at the en input defaults the ltc1563 to the shutdown state if the en pin is left floating . therefore, the user must connect the en pin to v C (or a logic low) to enable the part for normal operation.
9 LTC1563-2/ltc1563-3 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 lp sa nc inva nc lpa agnd v v + lpb nc invb nc sb nc en 0.1 f v v + ltc1563-x analog ground plane digital ground plane (if any) 1563 pf01 single point system ground 0.1 f pi n fu n ctio n s uuu 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 lp sa nc inva nc lpa agnd v v + lpb nc invb nc sb nc en 0.1 f v + ltc1563-x analog ground plane digital ground plane (if any) 1563 pf02 single point system ground 0.1 f + dual supply power and ground connections single supply power and ground connections block diagra w 16 shutdown switch shutdown switch en lp 20k 20k agnd sa lpa inva r31 r21 r11 c2a v v + agnd v in 7 8 1 9 2 c1a 4 6 + sb lpb ltc1563-x patent pending 1563 bd invb r32 r22 r12 c2b agnd agnd v out 11 c1b 13 15 +
10 LTC1563-2/ltc1563-3 applicatio n s i n for m atio n wu u u functional description the LTC1563-2/ltc1563-3 are a family of easy-to-use, 4th order lowpass filters with rail-to-rail operation. the LTC1563-2, with a single resistor value, gives a unity-gain filter approximating a butterworth response. the ltc1563-3, with a single resistor value, gives a unity-gain filter approximating a bessel (linear phase) response. the proprietary architecture of these parts allows for a simple unity-gain resistor calculation: r = 10k(256khz/f c ) where f c is the desired cutoff frequency. for many appli- cations, this formula is all that is needed to design a filter. for example, a 50khz filter requires a 51.2k resistor. in practice, a 51.1k resistor would be used as this is the closest e96, 1% value available. the ltc1563-x is constructed with two 2nd order sec- tions. the output of the first section (section a) is simply fed into the second section (section b). note that section a and section b are similar, but not identical. the parts are designed to be simple and easy to use. by simply utilizing different valued resistors, gain, other transfer functions and higher cutoff frequencies are achieved. for these applications, the resistor value calcu- lation gets more difficult. the tables of formulas provided later in this section make this task much easier. for best results, design these filters using filtercad version 3.0 (or newer) or contact the linear technology filter applica- tions group for assistance. cutoff frequency (f c ) and gain limitations the ltc563-x has both a maximum f c limit and a mini- mum f c limit. the maximum f c limit (256khz in high speed mode and 25.6khz in the low power mode) is set by the speed of the ltc1563-xs op amps. at the maximum f c , the gain is also limited to unity. a minimum f c is dictated by the practical limitation of reliably obtaining large valued, precision resistors. as the desired f c decreases, the resistor value required increases. when f c is 256hz, the resistors are 10m. obtaining a reliable, precise 10m resistance between two points on a printed circuit board is somewhat difficult. for example, a 10m resistor with only 200m w of stray, layout related resistance in parallel, yields a net effective resistance of 9.52m and an error of C 5%. note that the gain is also limited to unity at the minimum f c . at intermediate f c , the gain is limited by one of the two reasons discussed above. for best results, design filters with gain using filtercad version 3 (or newer) or contact the linear technology filter applications group for assis- tance. while the simple formula and the tables in the applications section deliver good approximations of the transfer func- tions, a more accurate response is achieved using filtercad. filtercad calculates the resistor values using an accurate and complex algorithm to account for parasitics and op amp limitations. a design using filtercad will always yield the best possible design. by using the filtercad design tool you can also achieve filters with cutoff frequencies beyond 256khz. cutoff frequencies up to 360khz are attainable. contact the linear technology filter applications group for a copy the filtercad software. filtercad can also be downloaded from our website at www.linear-tech.com. dc offset, noise and gain considerations the ltc1563-x is dc offset trimmed in a 2-step manner. first, section a is trimmed for minimum dc offset. next, section b is trimmed to minimize the total dc offset (section a plus section b). this method is used to give the minimum dc offset in unity gain applications and most higher gain applications. for gains greater than unity, the gain should be distributed such that most of the gain is taken in section a, with section b at a lower gain (preferably unity). this type of gain distribution results in the lowest noise and lowest dc offset. for high gain, low frequency applications, all of the gain is taken in section a, with section b set for unity-gain. in this configuration, the noise and dc offset is dominated by those of section a. at higher frequencies, the op amps finite bandwidth limits the amount of gain that section a can reliably achieve. the gain is more evenly distributed in this case. the noise and dc offset of section a is now multiplied by the gain of section b. the result is slightly higher noise and offset.
11 LTC1563-2/ltc1563-3 applicatio n s i n for m atio n wu u u output loading: resistive and capacitive the op amps of the ltc1563-x have a rail-to-rail output stage. to obtain maximum performance, the output load- ing effects must be considered. output loading issues can be divided into resistive effects and capacitive effects. resistive loading affects the maximum output signal swing and signal distortion. if the output load is excessive, the output swing is reduced and distortion is increased. all of the output voltage swing testing on the ltc1563-x is done with r22 = 100k and a 10k load resistor. for best undistorted output swing, the output load resistance should be greater than 10k. capacitive loading on the output reduces the stability of the op amp. if the capacitive loading is sufficiently high, the stability margin is decreased to the point of oscillation at the output. capacitive loading should be kept below 30pf. good, tight layout techniques should be maintained at all times. these parts should not drive long traces and must never drive a long coaxial cable. when probing the ltc1563-x, always use a 10x probe. never use a 1x probe . a standard 10x probe has a capacitance of 10pf to 15pf while a 1x probes capacitance can be as high as 150pf. the use of a 1x probe will probably cause oscillation. for larger capacitive loads, a series isolation resistor can be used between the part and the capacitive load. if the load is too great, a buffer must be used. layout precautions the ltc1563-x is an active rc filter. the response of the filter is determined by the on-chip capacitors and the external resistors. any external, stray capacitance in par- allel with an on-chip capacitor, or to an ac ground, can alter the transfer function. capacitance to an ac ground is the most likely problem. capacitance on the lpa or lpb pins does not affect the transfer function but does affect the stability of the op amps. capacitance on the inva and invb pins will affect the transfer function somewhat and will also affect the stability of the op amps. capacitance on the sa and sb pins alters the transfer function of the filter. these pins are the most sensitive to stray capacitance. stray capacitance on these pins results in peaking of the frequency response near the cutoff frequency. poor layout can give 0.5db to 1db of excess peaking. to minimize the effects of parasitic layout capacitance, all of the resistors for section a should be placed as close as possible to the sa pin. place the r31 resistor first so that it is as close as possible to the sa pin on one end and as close as possible to the inva pin on the other end. use the same strategy for the layout of section b, keeping all of the resistors as close as possible to the sb node and first placing r32 between the sb and invb pins. it is also best if the signal routing and resistors are on the same layer as the part without any vias in the signal path. figure 1 illustrates a good layout using the ltc1563-x with surface mount 0805 size resistors. an even tighter layout is possible with smaller resistors. 1653 f01 r11 ltc1563-x r12 r32 r22 r21 r31 v out v in figure 1. pc board layout single pole sections and odd order filters the ltc1563 is configured to naturally form even ordered filters (2nd, 4th, 6th and 8th). with a little bit of work, single pole sections and odd order filters are easily achieved. to form a single pole section you simply use the op amp, the on-chip c1 capacitor and two external resistors as shown in figure 2. this gives an inverting section with the gain set by the r2-r1 ratio and the pole set by the r2-c1 time constant. you can use this pole with a 2nd order section to form a noninverting gain 3rd order filter or as a stand alone inverting gain single pole filter. figure 3 illustrates another way of making odd order filters. the r1 input resistor is split into two parts with an additional capacitor connected to ground in between the resistors. this tee network forms a single real pole. rb1
12 LTC1563-2/ltc1563-3 should be much larger than ra1 to minimize the interac- tion of this pole with the 2nd order section. this circuit is useful in forming dual 3rd order filters and 5th order filters with a single ltc1563 part. by cascading two parts, 7th order and 9th order filters are achieved. dc gain = LTC1563-2: c1a = 53.9pf, c1b = 39.2pf ltc1563-3: c1a = 35pf, c1b = 26.8pf ?2 r1 f p = 1 2 ?r2 ?c1 1563 f02 + c1 inv c2 s 1/2 ltc1563 lp agnd r1 (open) r2 v out v in figure 2 ra1 rb1 10 r2 rb1 ra1 r3 c p 1563 f03 ra1 ?rb1 ra1 + rb1 f p = 1 () 2 ? p + c1 inv c2 s 1/2 ltc1563 lp agnd + (open) c1 inv c2 s 1/2 ltc1563 lp 1563 f04 agnd you can also use the tee network in both sections of the part to make a 6th order filter. this 6th order filter does not conform exactly to the textbook responses. textbook responses (butterworth, bessel, chebyshev etc.) all have three complex pole pairs. this filter has two complex pole pairs and two real poles. the textbook response always has one section with a low q value between 0.5 and 0.6. by replacing this low q section with two real poles (two real poles are the same mathematically as a complex pole pair with a q of 0.5) and tweaking the q of the other two complex pole pair sections you end up with a filter that is indistinguishable from the textbook filter. the typical applications section illustrates a 100khz, 6th order pseudo- butterworth filter. filtercad is a valuable tool for custom filter design and tweaking textbook responses. figure 3 what to do with an unused section if the ltc1563 is used as a 2nd or 3rd order filter, one of the sections is not used. do not leave this section uncon- nected. if the section is left unconnected, the output is left to float and oscillation may occur. the unused section should be connected as shown in figure 4 with the inv pin connected to the lp pin and the s pin left open. figure 4 applicatio n s i n for m atio n wu u u
13 LTC1563-2/ltc1563-3 figure 5. 4th order filter connections (power supply, ground, en and lp connections not shown for clarity). table 1 shows resistor values 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 lp sa nc inva nc lpa agnd v v + lpb nc invb nc sb nc en v out LTC1563-2 v in 1563 f03 r31 r32 r22 r21 r11 r12 4th order filter responses using the LTC1563-2 frequency (hz) 0.1 gain (db) ?0 ?0 ?0 ?0 ?0 10 0 10 1 1563 f03a normalized to f c = 1hz butterworth 0.5db ripple chebyshev 0.1db ripple chebyshev figure 5a. frequency response frequency (hz) 0.1 gain (db) ? ? ? ? ?0 1 0 2 1 1563 f03b butterworth 0.5db ripple chebyshev 0.1db ripple chebyshev normalized to f c = 1hz figure 5b. passband frequency response time (s) 0 output voltage (v) 1.2 1.0 0.8 0.6 0.4 0.2 0 1.0 0.5 1.5 2.0 1563 f03c 2.5 3.0 butterworth 0.5db ripple chebyshev 0.1db ripple chebyshev normalized to f c = 1hz figure 5c. step response table 1. resistor values, normalized to 256khz cutoff frequency (f c ), figure 5. the passband gain, of the 4th order LTC1563-2 lowpass filter, is set to unity. (note 1) 0.1db ripple 0.5db ripple butterworth chebyshev chebyshev lp mode max f c 25.6khz 15khz 13khz hs mode max f c 256khz 135khz 113khz r11 = r21 = 10k(256khz/f c ) 13.7k(256khz/f c ) 20.5k(256khz/f c ) r31 = 10k(256khz/f c ) 10.7k(256khz/f c ) 12.4k(256khz/f c ) r12 = r22 = 10k(256khz/f c ) 10k(256khz/f c ) 12.1k(256khz/f c ) r32 = 10k(256khz/f c ) 6.81k(256khz/f c ) 6.98k(256khz/f c ) example: in hs mode, 0.1db ripple chebyshev, 100khz cutoff frequency, r11 = r21 = 35k @ 34.8k (1%), r31 = 27.39k @ 27.4k (1%), r12 = r22 = 256k @ 255k (1%), r32 = 17.43k @ 17.4k (1%) note 1: the resistor values listed in this table provide good approximations of the listed transfer functions. for the optimal resistor values, higher gain or other transfer functions, use filtercad version 3.0 (or newer) or contact the linear technology filter applications group for assistance. applicatio n s i n for m atio n wu u u
14 LTC1563-2/ltc1563-3 table 2. resistor values, normalized to 256khz cutoff frequency (f c ), figure 6. the passband gain, of the 4th order ltc1563-3 lowpass filter, is set to unity. (note 1) transitional transitional bessel gaussian to 6db gaussian to 12db lp mode max f c 25.6khz 20khz 21khz hs mode max f c 256khz 175khz 185khz r11 = r21 = 10k(256khz/f c ) 17.4k(256khz/f c ) 15k(256khz/f c ) r31 = 10k(256khz/f c ) 13.3k(256khz/f c ) 11.8k(256khz/f c ) r12 = r22 = 10k(256khz/f c ) 14.3k(256khz/f c ) 10.5k(256khz/f c ) r32 = 10k(256khz/f c ) 6.04k(256khz/f c ) 6.19k(256khz/f c ) note 1: the resistor values listed in this table provide good approximations of the listed transfer functions. for the optimal resistor values, higher gain or other transfer functions, use filtercad version 3.0 (or newer) or contact the linear technology filter applications group for assistance. 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 lp sa nc inva nc lpa agnd v v + lpb nc invb nc sb nc en v out ltc1563-3 v in 1563 f04 r31 r32 r22 r21 r11 r12 figure 6. 4th order filter connections (power supply, ground, en and lp connections not shown for clarity). table 2 shows resistor values frequency (hz) 0.1 gain (db) ?0 ?0 ?0 ?0 ?0 10 0 10 1 1563 f04a normalized to f c = 1hz bessel transitional gaussian to 12db transitional gaussian to 6db 4th order filter responses using the ltc1563-3 figure 6a. frequency response figure 6b. step response figure 6c. step responsesettling time (s) 0 output voltage (v) 1.2 1.0 0.8 0.6 0.4 0.2 0 1.0 0.5 1.5 2.0 1563 f04b 2.5 3.0 bessel transitional gaussian to 12db transitional gaussian to 6db normalized to f c = 1hz time (s) 0 output voltage (v) 2.0 1563 f04c 0.5 1.0 1.5 1.05 1.00 0.95 bessel transitional gaussian to 12db transitional gaussian to 6db normalized to f c = 1hz applicatio n s i n for m atio n wu u u
15 LTC1563-2/ltc1563-3 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 lp sa nc inva nc lpa agnd v v + lpb nc invb nc sb nc en v out 5v enable v in 1563 ta03 169k 95.3k 162k 274k 274k 162k 0.1 f LTC1563-2 ?v 0.1 f 5v, 2.3ma supply current, 20khz, 4th order, 0.5db ripple chebyshev lowpass filter frequency response 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 lp sa nc inva nc lpa agnd v v + lpb nc invb nc sb nc en v in enable 115k 196k 82.5k 210k LTC1563-2 LTC1563-2 137k 115k 0.1 f 0.1 f 82.5k 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 lp sa nc inva nc lpa agnd v v + lpb nc invb nc sb nc en v out 3.3v 1563 ta05 75k 100k 158k 210k 158k 0.1 f 0.1 f single 3.3v, 2ma supply current, 20khz 8th order butterworth lowpass filter frequency (khz) 1 gain (db) 10 0 ?0 ?0 ?0 ?0 ?0 ?0 ?0 ?0 ?0 10 100 1563 ta06 frequency response frequency (khz) 1 gain (db) 10 0 ?0 ?0 ?0 ?0 ?0 ?0 ?0 ?0 ?0 10 100 1563 ta04 typical applicatio s u
16 LTC1563-2/ltc1563-3 typical applicatio s u 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 lp sa nc inva nc lpa agnd v v + lpb nc invb nc sb nc en v out 3.3v v in 1563 ta09 r31 17.8k r32 20.5k r22 28.7k r21 32.4k 0.1 f LTC1563-2 0.1 f c12 560pf c11 560pf r a2 3.16k r b2 25.5k r a1 3.16k r b1 29.4k frequency (hz) 10k gain (db) 10 0 ?0 ?0 ?0 ?0 ?0 ?0 ?0 ?0 ?0 100 100k 1m 1563 ta09a 100khz, 6th order pseudo-butterworth frequency response textbook butterworth pseudo-butterworth f o 1 = 100khz q1 = 1.9319 f o 1 = 100khz q1 = 1.9319 f o 2 = 100khz q2 = 0.7071 f o 2 = 100khz q2 = 0.7358 f o 3 = 100khz q3 = 0.5176 f o 3 = 100khz real poles f o 4 = 100khz real poles the complex, 2nd order section of the textbook design with the lowest q is replaced with two real first order poles. the q of another section is slightly altered such that the final filters response is indistinguisable from a textbook butterworth response. the f o and q values listed above can be entered in filtercads enhanced design window as a custom re- sponse filter. after entering the coefficients, filtercad will produce a schematic of the circuit. the procedure is as follows: 1. after starting filtercad, select the enhanced design window. 2. select the custom response and set the custom f c to 1hz. 3. in the coefficients table, go to the type column and click on the types listed and set the column with two lp types and two lp1 types. this sets up a template of a 6th order filter with two 2nd order lowpass sections and two 1st order lowpass sections. 4. enter the f o and q coefficients as listed above. for a butterworth filter, use the same coefficients as the example circuit above except set all of the f o to 1hz. 5. set the custom f c to the desired cutoff frequency. this will automatically multiply all of the f o coefficients. you have now finished the design of the filter and you can click on the frequency response or step response buttons to verify the filters response. 6. click on the implement button to go on to the filter implementation stage. 7. in the enhanced implement window, click on the active rc button to choose the LTC1563-2 part. you are now done with the filters implementation. click on the schematic button to view the resulting circuit. other pseudo filter response coefficients (all f o are normalized for a 1hz filter cutoff) bessel 0.1db ripple chebyshev 0.5db ripple chebyshev transitional gaussian to 12db transitional gaussian to 6db f o 1 1.9070 1.0600 1.0100 2.1000 1.5000 q1 1.0230 3.8500 5.3000 2.2000 2.8500 f o 2 1.6910 0.8000 0.7200 1.2500 1.0500 q2 0.6110 1.0000 1.2000 0.8000 0.9000 f o 3 1.6060 0.6000 0.5000 1.2500 0.9000 f o 4 1.6060 1.0000 0.8000 1.2500 0.9000
17 LTC1563-2/ltc1563-3 typical applicatio s u 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 lp sa nc inva nc lpa agnd v v + lpb nc invb nc sb nc en 5v v in 5v r31 82.5k r32 78.7k r22 137k r21 243k 0.1 f LTC1563-2 0.1 f c11 560pf r12 137k r a1 26.7k r b1 215k + + + + + 1 2 3 4 5 6 7 8 9 10 34 a in + a in v ref refcomp agnd agnd agnd agnd dv dd dgnd v ss 35 36 33 32 31 30 27 11 to 26 29 28 av dd av dd shdn cs convst rd busy ov dd ognd ltc1604 560pf 2.2 f 47 f 49.9 10 f 10 f 10 f 10 f 5v or 3v 16-bit parallel bus p control lines 5v 10 ?v ?v + 10 f 1563 ta10 0 ?0 ?0 ?0 ?0 ?00 ?20 ?40 0 36.58 73.15 109.73 146.30 frequency (khz) amplitude (db) f sample = 292.6khz f in = 20khz sinad = 85db thd = ?1.5db 1563 ta10a 4096 point fft of the output data 22khz, 5th order, 0.1db ripple chebyshev lowpass filter driving the ltc1604, 16-bit adc
18 LTC1563-2/ltc1563-3 typical applicatio s u 50khz wideband bandpass 4th order bessel lowpass at 128khz with two highpass poles at 11.7khz yields a wideband bandpass centered at 50khz 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 lp sa nc inva nc lpa agnd v v + lpb nc invb nc sb nc en v out 5v v in 1563 ta12 r31 20k r32 20k r22 20k r21 20k r11 20k r12 20k 0.1 f ltc1563-3 0.1 f c12 680pf c11 680pf ?v 10 0 ?0 ?0 ?0 ?0 ?0 ?0 1k 10k 100k 1m frequency (hz) gain (db) 1563 ta12a to design these wideband bandpass filters with the ltc1563, start with a 4th order lowpass filter and add two highpass poles with the input, ac coupling capacitors. the lowpass cutoff frequency and highpass pole frequencies depend on the specific application. some experimentation of lowpass and highpass frequencies is required to achieve the desired response. filtercad does not directly support this configuration. use the custom design window in filtercad get the desired response and then use filtercad to give the schematic for the lowpass portion of the filter. calculate the two highpass poles using the following formulae: f hpa rc f hpb rc oo () = () = 1 21111 1 21212 , pp the design process is as follows: 1. after starting filtercad, select the enhanced design window. 2. choose a 4th order bessel or butterworth lowpass filter response and set the cutoff frequency to the high frequency corner of the desired bandpass. 3. click on the custom response button. this copies the lowpass coefficients into the custom design coeffi- cients table. 4. in the coefficients table, the first two rows are the lp type with the f o and q as previously defined. go to the third and fourth rows and click on the type column (currently a hyphen is in this space). change the type of each of these rows to type hp1. this sets up a template of a 6th order filter with two 2nd order lowpass sections and two 1st order highpass sections. 5. change the frequency of the highpass (hp1) poles to get the desired frequency response. 6. you may have to perform this loop several times before you close in on the correct response. 7. once you have reached a satisfactory response, note the highpass pole frequencies. the hp1 highpass poles must now be removed from the custom design coeffi- cients table. after removing the highpass poles, click on the implement button to go on to the filter implementa- tion stage. 8. in the enhanced implement window, click on the active rc button and choose the LTC1563-2 part. click on the schematic button to view the resulting circuit. 9. you now have the schematic for the 4th order lowpass part of the design. now calculate the capacitor values from the following formulae: c r f hpa c r f hpb oo 11 1 211 12 1 212 = () = () , pp
19 LTC1563-2/ltc1563-3 150khz, 0.5db ripple, 4th order chebyshev with 10db of dc gain 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 lp sa nc inva nc lpa agnd v v + lpb nc invb nc sb nc en v out 5v v in ?v 1563 ta11 r31 9.76k r32 12.7k r22 21k r21 76.8k r11 24.3k r12 21k 0.1 f LTC1563-2 0.1 f 20 10 0 ?0 ?0 ?0 ?0 ?0 ?0 ?0 10k 100k 1m frequency (hz) gain (db) 1563 ta11a gn package 16-lead plastic ssop (narrow 0.150) (ltc dwg # 05-08-1641) package descriptio u dimensions in inches (millimeters) unless otherwise noted. gn16 (ssop) 1098 * 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 3 4 5 6 7 8 0.229 ?0.244 (5.817 ?6.198) 0.150 ?0.157** (3.810 ?3.988) 16 15 14 13 0.189 ?0.196* (4.801 ?4.978) 12 11 10 9 0.016 ?0.050 (0.406 ?1.270) 0.015 0.004 (0.38 0.10) 45 0 ?8 typ 0.007 ?0.0098 (0.178 ?0.249) 0.053 ?0.068 (1.351 ?1.727) 0.008 ?0.012 (0.203 ?0.305) 0.004 ?0.0098 (0.102 ?0.249) 0.0250 (0.635) bsc 0.009 (0.229) ref 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. typical applicatio s u
20 LTC1563-2/ltc1563-3 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 lp sa nc inva nc lpa agnd v v + lpb nc invb nc sb nc en v out 3.3v enable v in 1563 ta07 10k 10k 10k 10k 10k 10k 0.1 f ltc1563-3 0.1 f frequency (hz) 10k gain (db) 10 0 ?0 ?0 ?0 ?0 ?0 100k 1m 1563 ta08 single 3.3v, 256khz bessel lowpass filter frequency response 156323f lt/tp 0800 4k ? printed in usa ? linear technology corporation 2000 linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 l fax: (408) 434-0507 l www.linear-tech.com related parts part number description comments ltc1560-1 5-pole elliptic lowpass, f c = 1mhz/0.5mhz no external components, so-8 ltc1562 universal quad 2-pole active rc 10khz < f o < 150khz ltc1562-2 universal quad 2-pole active rc 20khz < f o < 300khz ltc1569-6 low power 10-pole delay equalized elliptic lowpass f c < 80khz, one resistor sets f c , so-8 ltc1569-7 10-pole delay equalized elliptic lowpass f c < 256khz, one resistor sets f c , so-8 ltc1565-31 650khz continuous time, linear phase lowpass f c = 650khz, differential in/out typical applicatio s u

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Price & Availability of LTC1563-2

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