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1 ltc1164-6 11646fa low power 8th order pin selectable elliptic or linear phase lowpass filter 8th order pin selectable elliptic or bessel filter 4ma supply current with 5v supplies 64db attenuation at 1.44 f cutoff (elliptic response) f cutoff up to 30khz (50:1 f clk to f cutoff ratio) 110 v rms wideband noise with 5v supplies operates at single 5v supply with 1v rms input range operates up to 8v supplies ttl/cmos compatible clock input no external components available in 14-pin dip and 16-pin so wide packages antialiasing filters battery-operated instruments telecommunication filters the ltc 1164-6 is a monolithic 8th order elliptic lowpass filter featuring clock-tunable cutoff frequency and lowpower supply current. low power operation is achieved without compromising noise or distortion performance. at 5v supplies the ltc1164-6 uses only 4ma supply current while keeping wideband noise below 110 v rms . with a single 5v supply, the ltc1164-6 can provide up to10khz cutoff frequency and 80db signal-to-noise ratio while consuming only 2.5ma. the ltc1164-6 provides an elliptic lowpass rolloff with stopband attenuation of 64db at 1.44 f cutoff and an f clk - to-f cutoff ratio of 100:1 (pin 10 to v ). for a ratio of 100:1, f cutoff can be clock-tuned up to 10khz. for a f clk -to- f cutoff ratio of 50:1 (pin 10 to v + ), the ltc1164-6 provides an elliptic lowpass filter with f cutoff frequencies up to 20khz. when pin 10 is connected to ground, theltc1164-6 approximates an 8th order linear phase re- sponse with 65db attenuation at 4.5 f 3db and f clk /f 3db ratio of 160:1. the ltc1164-6 is pin compatible with theltc1064-1. 10khz anti-aliasing elliptic filter frequency response descriptio u features applicatio s u typical applicatio u , lt, ltc and ltm are registered trademarks of linear technology corporation. all other trademarks are the property of their respective owners. 12 3 4 5 6 7 1413 12 11 10 98 ltc1164-6 v in 8v ?v clk = 1mhz v out wideband noise = 115 v rms note: the connection from pin 7 to pin 14 should be madeunder the package. the power supplies should be bypassed by a 0.1 f capacitor as close to the package as possible. 1164-6 ta01 nc nc ?v frequency (khz) 1 gain (db) 0 ?0 ?0 ?0 ?0 ?0 ?0 ?0 ?0 10 100 1164-6 ta02 downloaded from: http:///
2 ltc1164-6 11646fa a u g w a w u w a r b s o lu t ex i t i s total supply voltage (v + to v ) ............................. 16v input voltage (note 2) ......... (v + + 0.3v) to (v 0.3v) output short-circuit duration ......................... indefinite power dissipation ............................................. 400mw burn-in voltage ...................................................... 16v operating temperature range ltc1164-6c ...................................... 40 c to 85 c ltc1164-6m (obsolete) .............. 55 c to 125 c storage temperature range ................ 65 c to 150 c lead temperature (soldering, 10 sec)................. 300 c (note 1) wu u package / o rder i for atio 12 3 4 5 6 7 top view n package 14-lead pdip 1413 12 11 10 98 nc v in gnd v + gnd lp6 connect 1 connect 2nc v clkell/bess v out nc ltc1164-6cn t jmax = 110 c, ja = 85 c/w j package 14-lead cerdip t jmax = 150 c, ja = 65 c/w order part number order part number ltc1164-6csw top view sw package 16-lead plastic so 12 3 4 5 6 7 8 1615 14 13 12 11 10 9 nc v in gnd v + gnd nc lp6 connect 1 connect 2nc v ncclk ell/bess nc v out t jmax = 110 c, ja = 65 c/w ltc1164-6cjltc1164-6mj obsolete package consider the n14 package as an alternate source e lectr ic al c c hara terist ics parameter conditions min typ max units passband gain 0.1hz to 0.25 f cutoff (note 4) f in = 1khz, (f clk /f c ) = 100:1 0.50 0.15 0.25 db passband ripple with v s = single 5v 1hz to 0.8 f c (table 2) 0.1 to 0.3 db gain at 0.50 f cutoff (note 3) f in = 2khz, (f clk /f c ) = 100:1 0.45 0.10 0.10 db gain at 0.90 f cutoff (note 3) f in = 3.6khz, (f clk /f c ) = 100:1 0.75 0.30 0.10 db gain at 0.95 f cutoff (note 3) f in = 3.8khz, (f clk /f c ) = 100:1 1.40 0.70 0.40 db gain at f cutoff (note 3) f in = 4khz, (f clk /f c ) = 100:1 3.70 2.70 2.30 db f in = 8khz, (f clk /f c ) = 50:1 3.10 2.10 1.50 db gain at 1.44 f cutoff (note 3) f in = 5.76khz, (f clk /f c ) = 100:1 ?5 64 58 db gain at 2.0 f cutoff (note 3) f in = 8khz, (f clk /f c ) = 100:1 ?5 ?4 ?8 db gain with f clk = 20khz f in = 200hz, (f clk /f c ) = 100:1 3.70 2.70 2.30 db gain with v s = 2.375v f in = 400khz, f in = 2khz, (f clk /f c ) = 100:1 0.50 0.10 0.30 db f in = 400khz, f in = 4khz, (f clk /f c ) = 100:1 3.50 2.50 2.00 db input frequency range (tables 3, 4) (f clk /f c ) = 100:1 0 ? 3 ltc1164-6 11646fa parameter conditions min typ max units maximum f clk (table 3) v s 7.5v 1.5 mhz v s 5v 1.0 mhz v s = single 5v, agnd = 2v 1.0 mhz clock feedthrough input at gnd, f = f clk , square wave v s = 7.5v, (f clk /f c ) = 100:1 500 v rms v s = 5v, (f clk /f c ) = 50:1 200 v rms wideband noise input at gnd, 1hz f < f clk v s = 7.5v 115 5% v rms v s = 2.5v 100 5% v rms input impedance 45 75 110 k ? output dc voltage swing v s = 2.375v 1.25 1.50 v v s = 5v 3.70 4.10 v v s = 7.5v 5.40 5.90 v output dc offset v s = 5v, (f clk /f c ) = 100:1 100 160 mv output dc offset tempco v s = 5v, (f clk /f c ) = 100:1 100 v/ c power supply current v s = 2.375v, t a > 25 c 2.5 4.0 ma 4.5 ma v s = 5v, t a > 25 c 4.5 7.0 ma 8.0 ma v s = 7.5v, t a > 25 c 7.0 11.0 ma 12.5 ma power supply range 2.375 8v note 1: stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. exposure to any absolutemaximum rating condition for extended periods may affect device reliability and lifetime. note 2: connecting any pin to voltages greater than v + or less than v may cause latch-up. it is recommended that no sources operating fromexternal supplies be applied prior to power-up of the ltc1164-6. note 3: all gains are measured relative to passband gain. note 4: the cutoff frequency of the filter is abbreviated as f cutoff or f c . stopband gain vs frequency(elliptic response) cc hara terist ics uw a t y p i ca lper f o r c e stopband gain vs frequency(elliptic response) frequency (khz) 2 gain (db) 10 0 ?0 ?0 ?0 ?0 ?0 ?0 ?0 ?0 ?0 18 1164-6 g02 6 10 14 22 4 8 12 16 20 v s = 5v f clk = 250khz (f clk /f c ) = 50:1 (pin 10 at v + ) t a = 25 c with externalsingle pole low- pass rc filter (f ?3db = 10khz) frequency (khz) gain (db) 10 0 ?0 ?0 ?0 ?0 ?0 ?0 ?0 ?0 ?0 1164-6 g01 21 8 6 10 14 22 4 8 12 16 20 v s = 5v f clk = 500khz f c = 5khz (f clk /f c ) = 100:1 (pin 10 at v ) t a = 25 c e lectr ic al c c hara terist ics the denotes specifications that apply over the full operating temperature range, otherwise specifications are at t a = 25 c. v s = 7.5v, r l = 10k, t a = 25 c, f clk = 400khz, ttl or cmos level (maximum clock rise or fall time 1 s) and all gain measurements are referenced to passband gain, unless otherwise specified. (f clk /f cutoff ) = 4khz at 100:1 and 8khz at 50:1. downloaded from: http:///
4 ltc1164-6 11646fa cc hara terist ics uw a t y p i ca lper f o r c e passband gain vs frequency frequency (khz) 0.4 gain (db) 1.0 1.6 2.2 2.8 1164-6 g05 3.4 0.80.4 0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 4.0 v s = 5v f clk = 500khz f c = 5khz (f clk /f c ) = 100:1 (pin 10 at v ) t a = 25 c (10 representa-tive units) maximum passband overtemperature frequency (khz) 1 gain (db) 5 1164-6 g11 3 4 phase (deg) 32 1 0 ?? ? ? ? ? ? 2 v s = 5v f clk = 800khz f c = 5khz (f clk /f c ) = 160:1 (pin 10 at gnd)t a = 25 c 0 ?0 ?0 ?0 120 150 180 210 240 270 300 phase gain passband gain and phase vsfrequency (linear phase response) passband gain and phase vsfrequency and f clk frequency (khz) gain (db) 32 1 0 ?? ? ? ? ? ? ? ? 12 1164-6 g08 345 0 ?5 ?0 ?35 180 225 270 315 360 405 450 495 540 phase (deg) phase b b a a v s = 5v f clk = 250khz f c = 5khz (f clk /f c ) = 50:1 (pin 10 at v ) t a = 25 c a. response without external single pole rc filter b. response with an external singlepole lowpass rc filter (f ?3db at 10khz) passband vs frequency and f clk input frequency (khz) 1 gain (db) 5 1 164-6 g06 2.01.5 1.0 0.5 0 0.5 1.0 1.5 2.0 2.5 3.0 10 a b cd v s = 5v (f clk /f c ) = 100:1 (pin 10 at v ) t a = 25 c a. f clk = 400khz f cutoff = 4khz b. f clk = 600khz f cutoff = 6khz c. f clk = 800khz f cutoff = 8khz d. f clk = 1mhz f cutoff = 10khz stopband gain vs frequency(linear phase response) frequency (khz) 2 gain (db) 10 0 ?0 ?0 ?0 ?0 ?0 ?0 ?0 ?0 ?0 34 1164-6 g03 10 18 26 42 6 14 22 30 38 v s = 5v f clk = 800khz f c = 5khz (f clk /f c ) = 160:1 (pin 10 at gnd)t a = 25 c a. response without external rc filter b. response with an external singlepole lowpass rc filter (f ?3db at 10khz) a b passband gain and phasevs frequency frequency (khz) 1 gain (db) 5 1164-6 g04 3 4 phase (deg) 2.01.5 1.0 0.5 0 0.5 1.0 1.5 2.0 2.5 3.0 2 v s = 5v f clk = 500khz f c = 5khz (f clk /f c ) = 100:1 (pin 10 at v ) t a = 25 c 0 ?5 ?0 135 180 225 270 315 360 405 450 frequency (khz) 1 gain (db) 5 1164-6 g07 0.40.2 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 10 a b v s = 5v f clk = 1mhz f c = 10khz (f clk /f c ) = 100:1 (pin 10 at v ) a. t a = 125 c b. t a = 85 c d. t a = 40 c c downloaded from: http:///
5 ltc1164-6 11646fa cc hara terist ics uw a t y p i ca lper f o r c e group delay vs frequency(linear phase response) frequency (khz) 1 group delay ( s) 250200 150 100 50 0 9 1164-6 g22 3 5 7 11 2 4 6 81 0 f clk = 800khz (f clk /f c ) = 160:1 f c = 5khz group delay vs frequency(elliptic response) frequency (khz) 1 thd + noise (db) 25 1164-6 g13 ?0 ?5 ?0 ?5 ?0 ?5 ?0 ?5 ?0 ?5 ?0 34 v s = 5v, v in = 1v rms (20k resistor pin 14 to v ) f clk = 500khz, f c = 5khz (f clk /f c ) = 100:1 , t a = 25 c (5 representative units) thd + noise vs frequency(elliptic response) thd + noise vs frequency(elliptic response) thd + noise vs frequency(elliptic response) maximum passband overtemperature frequency (khz) gain (db) 1164-6 g10 2.01.5 1.0 0.5 0 0.5 1.0 1.5 2.0 2.5 3.0 v s = single 5v (f clk /f c ) = 50:1 gnd = 2v withexternal rc lowpass filter (f ?3db = 40khz) 21 8 6 10 14 22 4 8 12 16 20 t a = 40 c t a = 70 c passband vs frequency and f clk frequency (khz) 1 gain (db) 10 1164-6 g09 2.01.5 1.0 0.5 0 ?.5 ?.0 ?.5 ?.0 ?.5 ?.0 v s = 8v (f clk /f c ) = 50:1 (pin 10 at v + ) t a = 25 c 30 a. f clk = 250khz f cutoff = 5khz b. f clk = 500khz f cutoff = 10khz c. f clk = 1mhz f cutoff = 20khz a c b frequency (khz) 1 thd + noise (db) 25 1164-6 g23 ?0 ?5 ?0 ?5 ?0 ?5 ?0 ?5 ?0 ?5 ?0 34 v s = 5v v in = 1v rms f clk = 800khz f c = 5khz (f clk /f c ) = 160:1 t a = 25 c thd + noise vs frequency(linear phase response) frequency (khz) thd + noise (db) 1164-6 g16 ?0 ?5 ?0 ?5 ?0 ?5 ?0 ?5 ?0 ?5 ?0 0.5 1 5 v s = single 5v, v in = 0.7v rms f clk = 500khz, f c = 5khz, (f clk /f c ) = 100:1 , t a = 25 c (5 representative units) frequency (khz) 1 group delay ( s) 5 1164-6 g12 3 4 700600 500 400 300 200 100 0 2 b a v s = 5v f c = 5khz t a = 25 c a. f clk = 250khz, (f clk /f c ) = 50:1 with external rc lowpassfilter (f c = 10khz) b. f clk = 500khz (f clk /f c ) = 100:1 frequency (khz) 1 thd + noise (db) 5 1164-6 g14 ?0 ?5 ?0 ?5 ?0 ?5 ?0 ?5 ?0 ?5 ?0 10 v s = 5v, v in = 1v rms , f clk = 500khz, f c = 10khz, (f clk /f c ) = 50:1 , t a = 25 c, with external rc lowpassfilter (f ?3db = 20khz) (5 representative units) downloaded from: http:///
6 ltc1164-6 11646fa cc hara terist ics uw a t y p i ca lper f o r c e thd + noise vs rms input forsingle 5v (elliptic response) input (v rms ) thd + noise (db) 1164-6 g18 ?0 ?5 ?0 ?5 ?0 ?5 ?0 ?5 ?0 ?5 ?0 0.1 1 2 a b a. gnd = 2.5vb. gnd = 2v (f clk /f c ) = 100:1 or 50:1 f in = 1khz, t a = 25 c thd + noise vs rms input(elliptic response) input (v rms ) 0.1 thd + noise (db) 15 1164-6 g17 ?0 ?5 ?0 ?5 ?0 ?5 ?0 ?5 ?0 ?5 ?0 v s = 7.5v v s = 5v (f clk /f c ) = 100:1 or 50:1 f in = 1khz, t a = 25 c power supply current vs powersupply voltage power supply (v + or v ) 0 current (ma) 1211 10 98 7 6 5 4 3 2 1 0 13 68 1164-6 g19 10 24579 ?5 c 25 c 125 c 2v/div 1ms/div 1164-6 g21 v s = 7.5v, v in = 3v 100hz square wave f clk = 800khz, (f clk /f c ) = 160:1, f cutoff = 5khz linear phase response transient response transient response 1164-6 g20 1ms/div v s = 7.5v, v in = 3v 100hz square wave f clk = 500khz, (f clk /f c ) = 100:1, f cutoff = 5khz elliptic response 2v/div at least a 1 f capacitor (figure 2). for single 5v operation at the highest f clk of 1mhz, pins 3 and 5 should be biased at 2v. this minimizes passband gain and phase variations(see typical performance characteristics curves: maxi- mum passband for single 5v, 50:1; and thd + noise vs rms input for single 5v, 50:1). v + (pins 4, 12): the v + (pin 4) and the v (pin 12) should be bypassed with a 0.1 f capacitor to an adequate analog ground. the filter? power supplies should be isolatedfrom other digital or high voltage analog supplies. a low noise linear supply is recommended. using a switching power supply will lower the signal-to-noise ratio of the filter. the supply during power-up should have a slew rate less than 1v/ s. when v + is applied before v and v (14-lead dual-in-line package) pi fu ctio s u uu nc (pins 1, 8, 13): pins 1, 8, and 13 are not connected to any internal circuit point on the device and should prefer-ably be tied to analog ground. v in (pin 2): the input pin is connected internally through a 50k resistor tied to the inverting input of an op amp.gnd (pins 3, 5): the filter performance depends on the quality of the analog signal ground. for either dual orsingle supply operation, an analog ground plane sur- rounding the package is recommended. the analog ground plane should be connected to any digital ground at a single point. for dual supply operation, pins 3 and 5 should be connected to the analog ground plane. for single supply operation pins 3 and 5 should be biased at 1/2 supply and they should be bypassed to the analog ground plane with downloaded from: http:///
7 ltc1164-6 11646fa pi fu ctio s u uu (14-lead dual-in-line package) buffer, figure 3,can be used provided that its input commonmode range is well within the filter? output swing. pin 6 is an intermediate filter output providing an unspecified 6th order lowpass filter. pin 6 should not be loaded. elliptic/linear phase (pin 10): the dc level at this pin selects the desired filter response, elliptic or linear phaseand determines the ratio of the clock frequency to the cutoff frequency of the filter. pin 10 connected to v provides an elliptic lowpass filter with clock-to-f cutoff ratio of 100:1. pin 10 connected to analog ground pro-vides a linear phase lowpass filter with a clock- to-f ?db ratio of 160:1 and a transient response overshoot of 1%.when pin 10 is connected to v + the clock-to-f cutoff ratio is 50:1 and the filter response is elliptic. bypassing pin 10to analog ground reduces the output dc offsets. if the dc level at pin 10 is switched mechanically or electrically at slew rates greater than 1v/ s while the device is operating, a 10k resistor should be connected between pin 10 and thedc source. clk (pin 11): any ttl or cmos clock source with a square-wave output and 50% duty cycle ( 10%) is an adequate clock source for the device. the power supply forthe clock source should not be the filter? power supply. the analog ground for the filter should be connected to clock? ground at a single point only. table 1 shows the clock? low and high level threshold value for a dual or single supply operation. a pulse generator can be used as a clock source provided the high level on time is greater than 0.5 s. sine waves are not recommended for clock input frequencies less than 100khz, since excessivelyslow clock rise or fall times generate internal clock jitter (maximum clock rise or fall time 1 s). the clock signal should be routed from the right side of the ic package toavoid coupling into any input or output analog signal path. a 1k resistor between clock source and pin 11 will slow down the rise and fall times of the clock to further reduce charge coupling, figures 1 and 2. 1k 1164-6 f03 + lt1006, f c < 5khz lt1200, f c > 5khz figure 3. buffer for filter output v (pins 7, 14): pins 7 and 14 should be connected together. in a printed circuit board the connection shouldbe done under the ic package through a short trace surrounded by the analog ground plane. v out (pins 9, 6): pin 9 is the specified output of the filter; it can typically source or sink 1ma. driving coaxial cablesor resistive loads less than 20k will degrade the total harmonic distortion of the filter. when evaluating the device? distortion an output buffer is required. a noninverting could go above ground, a signal diode must be used toclamp v. figures 1 and 2 show typical connections for dual and single supply operation. 12 3 4 5 6 7 1413 12 11 10 98 v in v + 1k v v out ltc1164-6 digital supply + gnd clock source * 1164-6 f01 * optional 0.1 f 0.1 f figure 1. dual supply operation for f clk /f cutoff = 100:1 table 1. clock source high and low threshold levels power supply high level low level dual supply = 7.5v 2.18v 0.5v dual supply = 5v 1.45v 0.5v dual supply = 2.5v 0.73v 2.0v single supply = 12v 7.80v 6.5v single supply = 5v 1.45v 0.5v figure 2. single supply operation for f clk /f cutoff = 100:1 12 3 4 5 6 7 1413 12 11 10 98 v in v + 1k v out digital supply + gnd clock source 1164-6 f02 + ltc1164-6 0.1 f 1 f 10k 10k downloaded from: http:///
8 ltc1164-6 11646fa u s a o pp l ic at i wu u i for atio passband responsethe passband response of the ltc1164-6 is optimized for a f clk /f cutoff ratio of 100:1. minimum passband ripple occurs from 1hz to 80% of f cutoff . athough the passband of the ltc1164-6 is optimized for ratio f clk /f cutoff of 100:1, if a ratio of 50:1 is desired, connect a single polelowpass rc (f ?db = 2 f cutoff ) at the output of the filter. the rc will make the passband gain response as flat as the100:1 case. if the rc is omitted, and clock frequencies are below 500khz the passband gain will peak by 0.4db at 90% f cutoff . table 2. typical passband ripple with single 5v supply(f clk /f c ) = 100:1, gnd = 2v, 30khz, fixed single pole, lowpass rc filter at pin 9 (see typical applications) passband passband gain frequency (referenced to 0db) f cutoff = 1khz f cutoff = 10khz t a = 25 ct a = 0 ct a = 25 ct a = 70 c % of f cutoff (db) (db) (db) (db) 10 0.00 0.00 0.00 0.00 20 0.02 0.00 0.01 0.01 30 0.05 0.01 0.01 0.01 40 0.10 0.02 0.02 0.02 50 0.13 0.03 0.01 0.03 60 0.15 0.01 0.01 0.05 70 0.18 0.01 0.01 0.07 80 0.25 0.08 0.05 0.02 90 0.39 0.23 0.18 0.05 f cutoff 2.68 2.79 2.74 2.68 the gain peaking can approximate a sin / correction for some applications. (see typical performance characteristicscurve, passband vs frequency and f clk at f clk /f c = 50:1.) when the ltc1164-6 operates with a single 5v supply and itscutoff frequency is clock-tuned to 10khz, an output single pole rc filter can also help maintain outstanding passband flatness from 0 c to 70 c. table 2 shows details. clock feedthroughclock feedthrough is defined as, the rms value of the clock frequency and its harmonics that are present at the filter? output (pin 9). the clock feedthrough is tested with the input (pin 2) grounded and, it depends on pc board layout and on the value of the power supplies. with proper layout techniques the values of the clock feedthrough are shown in table 3. table 3. clock feedthrough v s 50:1 100:1 2.5v 60 v rms 60 v rms 5v 100 v rms 200 v rms 7.5v 150 v rms 500 v rms note: the clock feedthrough at 2.5v supplies is imbedded in the wideband noise of the filter. (the clock signal is a square wave.) any parasitic switching transients during the rise and falledges of the incoming clock are not part of the clock feedthrough specifications. switching transients have fre- quency contents much higher than the applied clock; their amplitude strongly depends on scope probing techniques as well as grounding and power supply bypassing. the clock feedthrough, if bothersome, can be greatly reduced by adding a simple r/c lowpass network at the output of the filter (pin 9). this r/c will completely eliminate any switching transient. wideband noise the wideband noise of the filter is the total rms value of the device? noise spectral density and it is used to determine the operating signal-to-noise ratio. most of its frequency contents lie within the filter passband and it cannot be reduced with post filtering. for instance, the ltc1164-6 wideband noise at 2.5v supply is 100 v rms , 90 v rms of which have frequency contents from dc up to the filter? cutoff frequency. the total wideband noise( v rms ) is nearly independent of the value of the clock. the clock feedthrough specifications are not part of thewideband noise. speed limitations the ltc1164-6 optimizes ac performance versus power consumption. to avoid op amp slew rate limiting at maximum clock frequencies, the signal amplitude should be kept below a specified level as shown on table 4. aliasing aliasing is an inherent phenomenon of sampled data systems and it occurs when input frequencies close to the sampling frequency are applied. for the ltc1164-6 case, an input signal whose frequency is in the range of f clk 4%, will be aliased back into the filter? passband. if, for instance, an ltc1164-6 operating with a 100khz clock downloaded from: http:///
9 ltc1164-6 11646fa u s a o pp l ic at i wu u i for atio and 1khz cutoff frequency receives a 98.5khz, 10mv rms input signal, a 1.5khz, 10 v rms alias signal will appear at its output. when the ltc1164-6 operates with a clock-to-cutoff frequency of 50:1, aliasing occurs at twice the clock frequency. table 5 shows details. table 4. maximum v in vs v s and f clk power supply maximum f clk maximum v in 7.5v 1.5mhz 1v rms (f in > 35khz) 1mhz 3v rms (f in > 25khz) 1mhz 0.7v rms (f in > 250khz) 5v 1mhz 2.5v rms (f in > 25khz) 1mhz 0.5v rms (f in > 100khz) single 5v 1mhz 0.7v rms (f in > 25khz) 1mhz 0.5v rms (f in > 100khz) table 5. aliasing (f clk = 100khz) input frequency output level output frequency (v in = 1v rms ) (relative to input) (aliased frequency) (khz) (db) (khz) f clk /f c = 100:1, f cutoff = 1khz 96 (or 104) 75.0 4.0 97 (or 103) 68.0 3.0 98 (or 102) 65.0 2.0 98.5 (or 101.5) 60.0 1.5 99 (or 101) 3.2 1.0 99.5 (or 100.5) 0.5 0.5 f clk /f c = 50:1, f cutoff = 2khz 192 (or 208) 76.0 8.0 194 (or 206) 68.0 6.0 196 (or 204) 63.0 4.0 198 (or 202) 3.4 2.0 199 (or 201) 1.3 1.0 199.5(or 200.5) 0.9 0.5 table 6. transient response of ltc lowpass filters delay rise settling over- time* time** time*** shoot lowpass filter (sec) (sec) (sec) (%) ltc1064-3 bessel 0.50/f c 0.34/f c 0.80/f c 0.5 ltc1164-5 linear phase 0.43/f c 0.34/f c 0.85/f c 0 ltc1164-6 linear phase 0.43/f c 0.34/f c 1.15/f c 1 ltc1264-7 linear phase 1.15/f c 0.36/f c 2.05/f c 5 ltc1164-7 linear phase 1.20/f c 0.39/f c 2.20/f c 5 ltc1064-7 linear phase 1.20/f c 0.39/f c 2.20/f c 5 ltc1164-5 butterworth 0.80/f c 0.48/f c 2.40/f c 11 ltc1164-6 elliptic 0.85/f c 0.54/f c 4.30/f c 18 ltc1064-4 elliptic 0.90/f c 0.54/f c 4.50/f c 20 ltc1064-1 elliptic 0.85/f c 0.54/f c 6.50/f c 20 * to 50% 5%, ** 10% to 90% 5%, *** to 1% 0.5% 8th order elliptic lowpass filter (f clk /f c ) = 50:1 12 3 4 5 6 7 1413 12 11 10 98 ltc1164-6 v in v out f clk v + notes:1. optional output buffer 1/2 rc = (2)(f cutoff ) 2. pins 1, 8, 13 can be grounded or left floating 1164-6 ta06 c + v 0.1 f r v + v lt 1006 0.1 f v + input 90% 50% 10% output t r t d t s 1164-6 f04 rise time (t r ) = 5% 0.54 f cutoff settling time (t s ) = 5% (to 1% of output) 4.3 f cutoff time delay (t d ) = group delay (to 50% of output) 0.85 f cutoff figure 4 u s a o pp l ic at i ty p i ca l downloaded from: http:///
10 ltc1164-6 11646fa u s a o pp l ic at i ty p i ca l 8th order elliptic lowpass filter (f clk /f c ) = 100:1 8th order linear phase lowpass filter (f clk /f c ) = 160:1 8th order 20khz cutoff, elliptic filter operating with a single 5v supply and driving 1k, 1000pf load thd + noise vs frequency gain vs frequency frequency (khz) 1 thd + noise (db) 5 1164-6 ta05 ?0 ?5 ?0 ?5 ?0 ?5 ?0 ?5 ?0 ?5 ?0 10 v s = single 5v is = 5ma, 16th orderelliptic lowpass v in = 0.5v rms f clk = 540khz f c = 10khz frequency (khz) 1 gain (db) 10 1164-6 ta04 10 0 ?0 ?0 ?0 ?0 ?0 ?0 ?0 ?0 ?0 30 v s = single 5v i s = 5ma, 16th order elliptic lowpassf clk = 540khz f cutoff = 10khz single 5v, 16th order lowpass filter f cutoff = 10khz 12 3 4 5 6 7 1413 12 11 10 98 v in 5v f clk 1164-6 ta03 ltc1164-6 1 f 15k 10k 12 3 4 5 6 7 1413 12 11 10 98 ic1 c1 0.01 f r1 789 ? 5v 0.1 f 1k 5v 0.1 f 5v ic2 ltc1164-6 r2 7.89k c20.001 f v out + v s = single 5v, i s = 5ma typ 16th order lowpass filterfixed f cutoff , f clk = 540khz f cutoff = 10khz (f clk /f c ) = 54:1 1/2 r1c1 = 1/2 r2c2 = 2f cutoff 12 3 4 5 6 7 1413 12 11 10 98 ltc1164-6 v in v out f clk = 1mhz 5v notes:1. total supply current i s = 4ma (excluding output load current)2. flat passband up to 18khz, f 3db = 20khz 3. thd + noise 70db, 1v p-p v in 3v p-p , f in = 1khz 1164-6 ta09 1k + 510pf lt1200 0.1 f 5v 10k 6.65k 0.1 f 10k 51.1k 5v 2 3 4 7 5v 1000pf 1k 12 3 4 5 6 7 1413 12 11 10 98 ltc1164-6 v in v out f clk 1164-6 ta07 v 0.1 f 0.1 f v + 12 3 4 5 6 7 1413 12 11 10 98 ltc1164-6 v in v out f clk 1164-6 ta08 v 0.1 f 0.1 f v + downloaded from: http:///
11 ltc1164-6 11646fa 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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. package descriptio n u j package 14-lead cerdip (narrow .300 inch, hermetic) (reference ltc dwg # 05-08-1110) n package 14-lead pdip (narrow .300 inch) (reference ltc dwg # 05-08-1510) j16 0801 .015 ?.060 (0.380 ?1.520) .100 (2.54) bsc .014 ?.026 (0.360 ?0.660) .045 ?.065 (1.143 ?1.651) .200 (5.080) max .125 (3.175) min .008 ?.018 (0.203 ?0.457) 0 ?15 1 23 4 5 6 78 .220 ?.310 (5.588 ?7.874) .840 (21.336) max .005 (0.127) min 16 13 9 10 11 12 14 15 .025 (0.635) rad typ .300 bsc (7.62 bsc) .045 ?.065 (1.143 ?1.65) full lead option .023 ?.045 (0.584 ?1.143) half lead option corner leads option (4 plcs) note: lead dimensions apply to solder dip/plate or tin plate leads n14 1103 .020 (0.508) min .120 (3.048) min .130 .005 (3.302 0.127) .045 ?.065 (1.143 ?1.651) .065 (1.651) typ .018 .003 (0.457 0.076) .005 (0.127) min .255 .015* (6.477 0.381) .770* (19.558) max 3 1 2 4 5 6 7 8 9 10 11 12 13 14 .008 ?.015 (0.203 ?0.381) .300 ?.325 (7.620 ?8.255) .325 +.035?015 +0.889 0.381 8.255 () note:1. dimensions are inches millimeters *these dimensions do not include mold flash or protrusions. mold flash or protrusions shall not exceed .010 inch (0.254mm) .100 (2.54) bsc obsolete package downloaded from: http:///
12 ltc1164-6 11646fa ? linear technology corporation 1993 lt 0207 rev a ?printed in usa typical applicatio n u related parts part number description comments ltc1069-1 low power, 8th order elliptic lowpass operates from a single 3.3v to 5v supply ltc1069-6 very low power 8th order elliptic lowpass optimized for 3v/5v single supply operation, consumes 1ma at 3v 8th order low power, clock-tunable elliptic filter with active rc input antialiasing filter and output smoothing filter 12 3 4 5 6 7 1413 12 11 10 98 ltc1164-6 v in v out f clk v f c = 1khz attenuation at 10khz = 48db 1164-6 ta10 0.1 f v + 0.1 f v + 1/2 lt1013 r3 5.62k r2 76.8k r1 1.15k c3 0.001 f c2 0.022 f c1 0.1 f r2 97.6k r1 16.9k c20.001 f c1 0.0047 f f c = 1khz attenuation at 10khz = 30db 100hz f c 1khz 10khz f clk 100khz notes:1. clock-tunable over one decade of cutoff frequency 2. both input and output rc active filters are 0.1db chebyshev filters with 1khz ripple bandwidth + 1/2 lt1013 sw package 16-lead plastic small outline (wide .300 inch) (reference ltc dwg # 05-08-1620) s16 (wide) 0502 note 3 .398 ?.413 (10.109 ?10.490) note 4 16 15 14 13 12 11 10 9 1 n 23 4 5 6 78 n/2 .394 ?.419 (10.007 ?10.643) .037 ?.045 (0.940 ?1.143) .004 ?.012 (0.102 ?0.305) .093 ?.104 (2.362 ?2.642) .050 (1.270) bsc .014 ?.019 (0.356 ?0.482) typ 0 ?8 typ note 3 .009 ?.013 (0.229 ?0.330) .005 (0.127) rad min .016 ?.050 (0.406 ?1.270) .291 ?.299 (7.391 ?7.595) note 4 45 .010 ?.029 (0.254 ?0.737) inches (millimeters) note:1. dimensions in 2. drawing not to scale 3. pin 1 ident, notch on top and cavities on the bottom of packages are the manufacturing options. the part may be supplied with or without any of the options 4. these dimensions do not include mold flash or protrusions. mold flash or protrusions shall not exceed .006" (0.15mm) .420 min .325 .005 recommended solder pad layout .045 .005 n 123 n/2 .050 bsc .030 .005 typ package descriptio n u linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax: (408) 434-0507 www.linear.com downloaded from: http:///

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