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may 1997 ml2111 * universal dual high frequency filter block diagram 1 general description the ml2111 consists of two independent switched capacitor filters that operate at up to 150khz and perform second order filter functions such as lowpass, bandpass, highpass, notch and allpass. all filter configurations, including butterworth, bessel, cauer, and chebyshev can be formed. the center frequency of these filters is tuned by an external clock or the external clock and resistor ratio. the ml2111 frequency range is specified up to 150khz with 5.0v 10% power supplies. using a single 5.0v 10% power supply the frequency range is up to 100khz. these filters are ideal where center frequency accuracy and high qs are needed. the ml2111 is a pin compatible superior replacement for mf10, lmf100, and ltc1060 filters. features n specified for operation up to 150khz n center frequency x q product 5mhz n separate highpass, notch, allpass, bandpass, and lowpass outputs n center frequency accuracy of 0.4% or 0.8% max. n q accuracy of 4% or 8% max. n clock inputs are ttl or cmos compatible n single 5v (2.25v) or 5v supply operation 3 n/ap/hp a 2 bp a 1 lp a 4 inv a 5 s1 a s2 a 10 clk a 11 clk b 12 50/100hold 9 level shift control level shift non-overlap clock level shift non-overlap clock 19 bp b 20 lp b 17 inv b agnd 15 16 18 n/ap/hp b s1 b 6 s a/b s2 b 8 v d+ 7 v a+ 14 v a- 13 v d- - + - + + s - - + s - - * some packages are end of life and obsolete
ml2111 2 pin description pin name function 1lp a lowpass output for biquad a. 2bp a bandpass output for biquad a. 3 n/ap/hp a notch/allpass/highpass output for biquad a. 4 inv a inverting input of the summing op amp for biquad a. 5s1 a auxiliary signal input pin used in modes 1a, 1d, 4, 5, and 6b. 6s a/b controls s2 input function. 7v a+ positive analog supply. 8v d+ positive digital supply. 9 lsh reference point for clock input levels. logic threshold typically 1.4v above lsh voltage. 10 clk a clock input for biquad a. pin name function 11 clk b clock input for biquad b. 12 50/100/hold input pin to control the clock-to- center-frequency ratio of 50:1 or 100:1, or to stop the clock to hold the last sample of the bandpass or lowpass outputs. 13 v d- negative digital supply. 14 v a- negative analog supply. 15 agnd analog ground. 16 s1 b auxiliary signal input pin used in modes 1a, 1d, 4, 5, and 6b. 17 inv b inverting input of the summing op amp for biquad b. 18 n/ap/hp b notch/allpass/highpass output for biquad b. 19 bp b bandpass output for biquad b. 20 lp b lowpass output for biquad b. pin configuration 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 lp a bp a n/ap/hp a inv a s1 a s a/b v a+ v d+ lsh clk a lp b bp b n/ap/hp b inv b s1 b agnd v a- v d- 50/100/hold clk b top view ml2111 20-pin pdip (p20) 20-pin soic (s20)
ml2111 3 electrical characteristics unless otherwise specified, v a+ = v d+ = 5v 10%, v a- = v d- = -5v 10%, c l = 25pf, v in = 1.41v pk (1.000v rms ), clock duty cycle = 50%, t a = operating temperature range (note 1) symbol parameter conditions min typ max units filter f 0(max) maximum center frequency (note 2) figure 15 (mode 1), 100 khz v in= 1v pk (0.707v rms )q 50, q accuracy 25% figure 15 (mode 1), 150 khz q 20, q accuracy 15% f 0(min) minimum center frequency (note 2) figure 15 (mode 1), 25 hz v in= 1v pk (0.707v rms )q 50, q accuracy 30% figure 15 (mode 1), 25 hz q 20, q accuracy 15% f 0 temperature coefficient f clk < 5mhz -10 ppm/oc clock to center frequency ratio 50:1, f clk = 5mhz b suffix 49.65 49.85 50.05 q = 10, figure 15 (mode 1) c suffix 49.45 49.85 50.25 100:1, f clk = 5mhz b suffix 99.6 100.0 100.4 c suffix 99.2 100.0 100.8 f clk clock frequency q 20, q accuracy 15% 2.5 7500 khz clock feedthrough f clk 5mhz 10 20 mv (p-p) q accuracy f clk = 5mhz, q = 10, b suffix 3 % 50:1, figure 15 (mode 1) c suffix 5 % f clk = 5mhz, q = 10, b suffix 4 % 100:1, figure 15 (mode 1) c suffix 8 % q temperature coefficient f clk < 5mhz, q = 10 20 ppm/oc v os2,3 dc offset 50:1, f clk = 5mhz b suffix 7 40 mv s a/b = high or low c suffix 7 60 mv 100:1, f clk = 5mhz b suffix 14 60 mv s a/b =high or low c suffix 14 100 mv absolute maximum ratings absolute maximum ratings are those values beyond which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device operation is not implied. supply voltage |v a+ |, |v d+ | - |v a- |, |v d- | ...................................... 13v v a+ , v d+ to lsh ..................................................... 13v inputs ...................... |v a+ , v d+ | +0.3v to |v a- , v d- | -0.3v outputs ................... |v a+ , v d+ | +0.3v to |v a- , v d- | -0.3v |v a+ | to |v d+ | ........................................................ 0.3v junction temperature .............................................. 150oc storage temperature range ...................... C65oc to 150oc lead temperature (soldering, 10 sec) ..................... 300oc thermal resistance ( q ja ) 20-pin pdip ...................................................... 67oc/w 20-pin soic ..................................................... 95oc/w operating conditions temperature range ml2111ccx .............................................. 0oc to 70oc ml2111cip ............................................. -40oc to 85oc supply range ........................................ 2.25v to 6.0v
ml2111 4 electrical characteristics (continued) symbol parameter conditions min typ max units filter (continued) gain accuracy, dc lowpass r1,r3 = 20k w , r2 = 2k w , 0.01 2 % 100:1, f 0 = 50khz, q = 10 gain accuracy, bandpass at f 0 r1,r3 = 20k w , r2 = 2k w , b suffix 1 4 % 100:1, f 0 = 50khz, q = 10 c suffix 1 6 % gain accuracy, dc notch output r1,r3 = 20k w , r2 = 2k w , 0.02 2 % 100:1, f 0 = 50khz, q = 10 noise (note 3) bandpass 100khz, 50:1 103 v rms figure 15 (mode 1), 50khz, 100:1 121 v rms q = 1, r1 = r2 = r3 = 2k w lowpass 100khz, 50:1 120 v rms 50khz, 100:1 150 v rms notch 100khz, 50:1 115 v rms 50khz, 100:1 135 v rms noise (note 3) bandpass, 100khz, 50:1 262 v rms figure 15 (mode 1), r1 = 20k w 50khz, 100:1 333 v rms q = 10, r3 = 20k w , r2 = 2k w lowpass, 100khz, 50:1 268 v rms r1 = 2k w 50khz, 100:1 342 v rms notch, 100khz, 50:1 64 v rms r1 = 2k w 50khz, 100:1 72 v rms crosstalk f clk = 5mhz, f 0 = 100khz -50 db filter, v a + = v d + = 2.25v, v a - = v d - = -2.25v, v in = 0.707 x v pk (0.5 x v rms ) f 0(max) maximum center frequency figure 15 (mode 1), 75 khz q 50, q accuracy 30% figure 15 (mode 1), 100 khz q 20, q accuracy 15% f 0(min) minimum center frequency figure 15 (mode 1), 25 hz q 50, q accuracy 30% figure 15 (mode 1), 25 hz q 20, q accuracy 15% clock to center frequency ratio 50:1, f clk = 2.5mhz b suffix 49.65 49.85 50.05 q = 10, figure 15 (mode 1) c suffix 49.45 49.85 50.25 100:1, f clk = 2.5mhz b suffix 99.60 100.0 100.4 c suffix 99.20 100.0 100.8 f clk clock frequency q 20, q accuracy 15% 2.5 5000 khz q accuracy f clk = 2.5mhz, q = 10, b suffix 4 % 50:1, figure 15 (mode 1) c suffix 8 % f clk = 2.5mhz, q = 10, b suffix 3 % 100:1, figure 15 (mode 1) c suffix 6 %
ml2111 5 electrical characteristics (continued) symbol parameter conditions min typ max units filter, v a + = v d + = 2.25v, v a - = v d - = -2.25v, v in = 0.707 x v pk (0.5 x v rms ) (continued) noise (note 3) bandpass 100khz, 50:1 105 v rms figure 15 (mode 1), 50khz, 100:1 123 v rms q = 1, r1 = r2 = r3 = 2k w lowpass 100khz, 50:1 122 v rms 50khz, 100:1 152 v rms notch 100khz, 50:1 117 v rms 50khz, 100:1 138 v rms noise (note 3) bandpass, 100khz, 50:1 265 v rms figure 15 (mode 1), q = 10, r1 = 20k w 50khz, 100:1 335 v rms r3 = 20k w , r2 = 2k w lowpass, 100khz, 50:1 270 v rms r1 = 2k w 50khz, 100:1 245 v rms notch, 100khz, 50:1 65 v rms r1 = 2k w 50khz, 100:1 73 v rms operational amplifiers v os1 dc offset voltage 215mv a vol dc open loop gain r l = 1k w 95 db gain bandwidth product 2.4 mhz slew rate 2.0 v/s output voltage swing (clipping level) r l = 2k w , |v| from v a+ or v a- 0.5 1.2 v output short circuit current source 50 ma sink 25 ma clock v clk input low voltage 0.6 v v clk input high voltage 3.0 v clk a , clk b pulse width |v d+ | - |v d- | 3 4.5v 100 ns clk a , clk b pulse width |v d+ | - |v d- | 3 .90v 66 ns supply (i a+ )+(i d+ ) supply current, (v a+ ) + (v d+ )f clk = 5mhz 13 22 ma (i a- )+(i d- ) supply current, (v a- ) + (v d- )f clk = 5mhz 12 21 ma i lsh supply current, lsh f clk = 5mhz 0.5 1 ma note 1: limits are guaranteed by 100% testing, sampling, or correlation with worst case test conditions. note 2: the center frequency is defined as the peak of the bandpass output. note 3: the noise is meassured with an hp8903a audio analyzer with a bandwidth of 700khz, which is 7.5 times the f 0 at 50:1 and 15 times the f 0 at 100:1.
ml2111 6 typical performance curves figure 1a. f clk /f 0 vs. f clk (50:1, v s = 5v) 0.4 0.0 C0.4 C0.8 C1.2 C1.6 C2.0 C2.4 C2.8 f clk /f 0 deviation (%) f clk (mhz) 04810 26 q = 50 q = 20 q = 10 q = 5 mode 1 t a = 25oc v in = 0.707v rms 5 4 3 2 1 0 C1 C2 C3 f clk /f 0 deviation (%) f clk (mhz) 04810 26 mode 1 q = 10 v in = 0.707v rms t a = 85oc t a = 25oc figure 1b. f clk /f 0 vs. f clk (100:1, v s = 5v) q = 50 q = 20 q = 10 q = 5 mode 1 t a = 25oc v in = 0.707v rms 0.4 0.0 C0.4 C0.8 C1.2 C1.6 C2.0 C2.4 C2.8 C3.2 f clk /f 0 deviation (%) f clk (mhz) 04810 26 mode 1 q = 10 v in = 0.707v rms t a = 85oc t a = 25oc 0.5 0.0 C0.5 C1.0 C1.5 C2.0 f clk /f 0 deviation (%) f clk (mhz) 04810 26 figure 1c. f clk /f 0 vs. f clk (50:1, v s = 2.5v) 16 14 12 10 8 6 4 2 0 C2 f clk /f 0 deviation (%) f clk (mhz) 0 0579 16 24 3 8 q = 50 q = 20 q = 10 q = 5 mode 1 t a = 25oc v in = 0.5v rms mode 1 q = 10 v in = 0.5v rms t a = 85oc t a = 25oc 10 8 6 4 2 0 C2 f clk /f 0 deviation (%) f clk (mhz) 06 19 7 3 8 25 4
ml2111 7 typical performance curves (continued) figure 2a. f clk /f 0 deviation vs. temperature (50:1, v s = 5v) q = 50 q = 20 q = 10 q = 5 mode 1 t a = 25oc v in = 0.5v rms f clk /f 0 deviation (%) 5 4 3 2 1 0 C1 C2 f clk (mhz) 048 2 6 3 7 9 1 5 f clk (mhz) mode 1 q = 10 v in = 0.5v rms t a = 85oc t a = 25oc f clk /f 0 deviation (%) 12 10 8 6 4 2 0 C2 048 2 6 3 7 9 1 5 figure 1d. f clk /f 0 vs. f clk (100:1, v s = 2.5v) mode 1 q = 10 f 0 = 100khz f clk = 5mhz v in = 0.707v rms temperature (oc) C40 20 60 100 C20 40 80 0 0.08 0.06 0.04 0.02 0.00 C0.02 C0.04 C0.06 f clk /f 0 deviation (%) figure 2b. f clk /f 0 deviation vs. temperature (100:1, v s = 5v) temperature (oc) C40 20 60 100 C20 40 80 0 0.04 0.03 0.02 0.01 0 C0.01 f clk /f 0 deviation (%) mode 1 q = 10 f 0 = 50khz f clk = 5mhz v in = 0.707v rms mode 1 q = 10 f 0 = 50khz f clk = 2.5mhz v in = 0.5v rms temperature (oc) 20 60 100 C20 C40 40 80 0 0.10 0.08 0.06 0.04 0.02 0.00 C0.02 C0.04 C0.06 f clk /f 0 deviation (%) figure 2c. f clk /f 0 deviation vs. temperature (50:1, v s = 2.5v) figure 2d. f clk /f 0 deviation vs. temperature (100:1, v s = 2.5v) mode 1 q = 10 f o = 25khz f clk = 2.5mhz v in = 0.5v rms temperature (oc) 20 60 100 C20 C40 40 80 0 0.06 0.04 0.02 0.00 C0.02 C0.04 C0.06 f clk /f 0 deviation (%)
ml2111 8 figure 2g. q error vs. f clk (50:1, v s = 2.5v) typical performance curves (continued) figure 2f. q error vs. f clk (100:1, v s = 5v) figure 2e. q error vs. f clk (50:1, v s = 5v) q = 50 q = 20 q = 10 q = 5 mode 1 t a = 25oc v in = 0.707v rms 20 16 12 8 4 0 C4 C8 q deviation (%) f clk (mhz) 04810 26 mode 1 q = 10 v in = 0.707v rms t a = 85oc t a = 25oc 20 16 12 8 4 0 C4 q deviation (%) f clk (mhz) 04810 26 q = 50 q = 20 q = 10 q = 5 mode 1 t a = 25oc v in = 0.707v rms 20 15 10 5 0 C5 C10 C15 q deviation (%) f clk (mhz) 04810 26 mode 1 q = 10 v in = 0.707v rms t a = 85oc t a = 25oc 20 16 12 8 4 0 C4 q deviation (%) f clk (mhz) 04810 26 q = 50 q = 20 q = 10 q = 5 mode 1 t a = 25oc v in = 0.5v rms q deviation (%) f clk (mhz) 10 5 0 C5 C10 C15 C20 02 7 5 13 6 4 mode 1 q = 10 v in = 0.5v rms t a = 85oc t a = 25oc q deviation (%) f clk (mhz) 8 4 0 C4 C8 02 7 5 13 6 4
ml2111 9 figure 3a. q deviation vs. temperature (50:1, v s = 5v) figure 2h. q error vs. f clk (100:1, v s = 2.5v) q deviation (%) f clk (mhz) 16 12 8 4 0 C4 C8 C12 02 7 5 13 6 4 q = 50 q = 20 q = 10 q = 5 mode 1 t a = 25oc v in = 0.5v rms typical performance curves (continued) mode 1 q = 10 v in = 0.5v rms t a = 85oc t a = 25oc q deviation (%) f clk (mhz) 16 12 8 4 0 C4 C8 C12 02 7 5 13 6 4 figure 3b. q deviation vs. temperature (100:1, v s = 5v) temperature (oc) 20 60 C20 C40 40 80 0 0.4 0.2 0.0 C0.2 C0.4 C0.6 C0.8 q deviation (%) mode 1 q = 10 f 0 = 100khz f clk = 5mhz v in = 0.707v rms 100 temperature (oc) 20 60 100 C20 C40 40 80 0 0.6 0.4 0.2 0.0 C0.2 C0.4 C0.6 C0.8 C1.0 q deviation (%) mode 1 q = 10 f 0 = 50khz f clk = 5mhz v in = 0.707v rms figure 3c. q deviation vs. temperature (50:1, v s = 2.5v) figure 3d. q deviation vs. temperature (100:1, v s = 2.5v) temperature (oc) 20 60 100 C20 C40 40 80 0 0.2 0.0 C0.2 C0.4 q deviation (%) mode 1 q = 10 f 0 = 50khz f clk = 2.5mhz v in = 0.5v rms temperature (oc) 20 60 100 C20 C40 40 80 0 0.2 0.0 C0.2 C0.4 q deviation (%) mode 1 q = 10 f 0 = 25khz f clk = 2.5mhz v in = 0.5v rms
ml2111 10 typical performance curves (continued) 4 0 C4 C8 f clk /f 0 deviation (%) ideal q (r3/r2) 0.1 1 10 100 100:1 50:1 mode 1 t a = 25oc f clk = 5mhz v in = 1v rms f clk /f 0 deviation (%) ideal q (r3/r2) 0.1 1 10 100 0.05 0.0 C0.05 mode 1 t a = 25oc 50:1 or 100:1 f clk = 5mhz v in = 1v rms figure 4a. f clk /f 0 deviation vs. q (v s = 5v) figure 4a. f clk /f notch deviation vs. q (v s = 5v) figure 5a. q deviation vs. q (50:1, v s = 5v) q deviation (%) ideal q (r3/r2) 4 0 C4 C8 C12 C16 0.1 1 10 100 mode 1 t a = 25oc f 0 = 100khz f clk = 5mhz v s = 5v figure 5b. q deviation vs. q (100:1, v s = 5v) 2 0 C2 C4 C6 C8 q deviation (%) ideal q (r3/r2) 0.1 1 10 100 mode 1 t a = 25oc f 0 = 50khz f clk = 5mhz v s = 5v figure 6a. distortion vs. f in (50:1, v s = 5v) figure 6b. distortion vs. f in (100:1, v s = 5v) single frequency distortion level (db) f in (khz) 04080 20 100 60 70 60 50 40 30 20 10 0 mode 1 q = 1 f 0 = 100khz f clk = 5mhz v s = 5v t a = 25oc r l = 2k w low pass output v out = 0.5v v out = 1.41v v out = 2v v out = 3v v out = 4v mode 1 q = 1 f 0 = 50khz f clk = 5mhz v s = 5v t a = 25oc r l = 2k w low pass output v out = 0.5v v out = 1.41v v out = 2v v out = 3v v out = 4v single frequency distortion level (db) f in (khz) 02040 10 50 30 70 60 50 40 30 20 10 0
ml2111 11 typical performance curves (continued) figure 7a. noise spectrum density (q = 1) mode 1 50:1 r1 = r2 = r3 = 2k w bandpass output v s = 5v f 0 = 100khz f clk = 5mhz noise (nv/ ? hz ) frequency (khz) 250 200 150 100 50 0 0 200 300 500 400 100 mode 1 50:1 r1 = r3 = 20k w, r2 = 2k w bandpass output v s = 5v f 0 = 100khz f clk = 5mhz noise (nv/ ? hz ) frequency (khz) 2500 2000 1500 1000 500 0 0 200 300 500 400 100 figure 7b. noise spectrum density (q = 10) figure 8. f clk /f notch vs. f clk figure 9. notch depth vs. f clk 100:1 50:1 mode 1 t a = 25oc q = 10 v s = 5v v in = 0.707v rms 100 80 60 40 20 0 notch depth (db) f clk (mhz) 04810 26 0.8 0.4 0.0 C0.4 C0.8 C1.2 C1.6 f clk /f notch deviation (%) f clk (mhz) 04810 26 100:1 50:1 mode 1 t a = 25oc q = 10 v s = 5v v in = 0.707v rms figure 10. supply current vs. supply voltage figure 11. supply current vs. temperature temperature (oc) C40 20 60 100 C20 40 80 0 15 14 13 12 11 10 supply current (ma) mode 1 v s = 5v f clk = 5mhz 50:1 16 14 12 10 8 supply current (ma) supply voltage (v) 234 6 5 q = 10 t a = 25oc l sh = v ss 50:1 f clk = 3mhz f clk = 250khz f clk = 10mhz f clk = 5mhz
ml2111 12 f clk /f 0 ratio the ml2111 is a sampled data filter and approximates continuous time filters. the filter deviates from its ideal continuous filter model when the (f clk /f 0 ) ratio decreases and when the qs are low. f 0 q product ratio the f 0 q product of the ml2111 depends on the clock frequency and the mode of operation. the f 0 q product is mainly limited by the desired f 0 and q accuracy for clock frequencies below 1mhz in mode 1 and its derivatives. if the clock to center frequency ratio is lowered below 50:1, the f 0 q product can be further increased for the same clock frequency and for the same q value. mode 3, (figure 23) and the modes of operation where r4 is finite, are "slower" than the basic mode 1. the resistor r4 places the input op amp inside the resonant loop. the finite gbw of this op amp creates an additional phase shift and enhances the q value at high clock frequencies. output noise the wideband rms noise on the outputs of the ml2111 is nearly independent of the clock frequency, provided that the clock itself does not become part of the noise. noise at the bp and lp outputs increases for high values of q. filter function definitions each filter of the ml2111, along with external resistors and a clock, approximates second order filter functions. these are tabulated below in the frequency domain. 1. bandpass function: available at the bandpass output pins (bp a , bp b ), figure 12. gs h s q s s q obp () =? ? + ? + w w w 0 20 0 2 (1) where: h obp = gain at w = w 0 f 0 = w 0 /2 p . the center frequency of the complex pole pair is f 0 . it is measured as the peak frequency of the bandpass output. q = the quality factor of the complex pole pair. it is the ratio of f 0 to the -3db bandwidth of the 2nd order bandpass function. the q is always measured at the filter bp output. functional description power supplies the analog (v a+ ) and digital (v d+ ) supply pins, in most cases, are tied together and bypassed to agnd with 100nf and 10nf disk ceramic capacitors. the supply pins can be bypassed separately if a high level of digital noise exists. these pins are internally connected by the ic substrate and should be biased from the same dc source. the ml2111 operates from either a single supply from 4v to 12v, or with dual supplies at 2v to 6v. clock input pins and level shift with dual supplies equal to or higher than 4.0v, the lsh pin can be connected to the same potential as either the agnd or the v a - pin. with single supply operation the negative supply pins and lsh pin should be tied to the system ground. the agnd pin should be biased half way between v a+ and v a- . under these conditions the clock levels are ttl or cmos compatible. both input clock pins share the same level shift pin. 50/100/hold tying the 50/100/hold pin to the v a+ and v d+ pins makes the filter operate in the 50:1 mode. tying the pin half way between v a+ and v a- makes the filter operate in the 100:1 mode. the input range for 50/100/hold is either 2.5v 0.5v with a total power supply range of 5v, or 5v 0.5v with a total power supply range of 10v. when 50/100/hold is tied to the negative power supply input, the filter operation is stopped and the bandpass and lowpass outputs act as a sample/hold circuit which holds the last sample. s1 a & s1 b these voltage signal input pins should be driven by a source impedance of less than 5k w . the s 1a and s 1b pins can be used to feedforward the input signal for allpass filter configurations (see modes 4 & 5) or to alter the clock-to-center-frequency ratio (f clk /f 0 ) of the filter (see modes 1b, 1c, 2a, & 2b). when these pins are not used they should be tied to the agnd pin. s a/b when s a/b is high, the s2 negative input of the voltage summing device is tied to the lowpass output. when the s a/b pin is connected to the negative supply, the s2 input switches to ground. agnd agnd is connected to the system ground for dual supply operation. when operating with a single positive supply the analog ground pin should be biased half way between v a+ and v a- , and bypassed with a 100nf capacitor. the positive inputs of the internal op amps and the reference point of the internal switches are connected to the agnd pin.
ml2111 13 q f ff fff hl lh = - =? 0 0 ; ff qq l =? - + + 0 2 1 2 1 2 1 ff qq h =? + + 0 2 1 2 1 2 1 figure 12. ff qq c =? - +- + 0 22 2 1 1 2 1 1 2 1 ff q p =? - 0 2 1 1 2 hh q q op olp =? ?- 1 1 1 1 4 2 figure 13. 2. lowpass function: available at the lp output pins, figure 13. gs h s s q olp () =? + ? + w w w 0 2 20 0 2 (2) where: h olp = dc gain of the lp output 3. highpass function: available only in mode 3 at n/ap/hp a and n/ap/hp b , figure 14. gs h s s s q ohp () =? + ? + 2 20 0 2 w w (3) h ohp = gain of the hp output for f ? f clk /2. filter function definitions (continued) bandpass output h obp 0.707 h obp gain (v/v) f l f 0 f h f (log scale) lowpass output h op 0.707 h olp gain (v/v) f p f c f (log scale) h olp ff qq c =? - +- + ! " $ # # # - 0 22 2 1 1 1 2 1 1 2 1 ff q p =? - ! " $ # # - 0 2 1 1 1 2 hh q q op ohp =? ?- 1 1 1 1 4 2 figure 14. highpass output h op 0.707 h ohp gain (v/v) f c f p f (log scale) h ohp
ml2111 14 4. notch function: available at n/ap/hp a and n/ap/hp b for several modes of operation. gs h s s s q on n () =? + + ? + 2 2 2 20 0 2 w w w 49 (4) h on2 = gain of the notch output for f ? f clk /2. h on1 = gain of the hp output for f ? 0 f n = w n /2 p . the frequency of the notch occurrence is f n . 5. allpass function: available at n/ap/hp a and n/ap/ hp b for modes 4 and 4a. gs h s s q s s q oap () =? - ? + + ? + 20 0 2 2 0 0 2 w w w w (5) h oap = gain of the allpass output for 0 < f < f clk /2 for allpass functions, the center frequency and the q of the numerator complex zero pair is the same as the denominator. under these conditions the magnitude response is a straight line. in mode 5, the center frequency f z of the numerator complex zero pair is different than f 0 . for high numerator q's, the magnitude response will have a notch at f z . filter function definitions + lp v+ s a/b 6 15 1 (20) r3 r2 4 (17) v in + s bp1 s1 a 5 (16) bp2 3 (18) 2 (19) + + s bp lp v in s1 a v+ r1 s a/b 6 15 5 (16) n 3 (18) 2 (19) 1 (20) r3 r2 4 (17) ? ml2111 ? ml2111 figure 15. mode 1: 2nd order filter providing notch, bandpass, lowpass figure 16. mode 1a: 2nd order filter providing bandpass, lowpass f f ffh r2 r h r3 r clk nolp obp 00 100 50 1 1 = = =- =- () ;; ; ; h r2 r q r3 r2 on1 1 =- = ; f f q r3 r2 h r3 r2 clk obp 01 100 50 ===- () ;; ; h non inverting h obp olp 2 11 =- =- (); operation modes there are three basic modes of operation modes 1, 2, and 3 , each of which has derivatives; and four secondary modes of operation modes 4, 5, 6, and 7, each of which also has derivatives. in figure 15, the input amplifier is outside the resonant loop. because of this, mode 1 and its derivatives (modes 1a, 1b, 1c, and 1d) are faster than modes 2 and 3. mode 1 provides a clock tunable notch. it is a practical configuration for second order clock tunable bandpass/ notch filters. in mode 1, a band pass output with a very high q, together with unity gain can be obtained with the dynamics of the remaining notch and lowpass outputs. mode 1a (figure 16) represents the simplest hookup of the ml2111. it is useful when voltage gain at the bandpass output is required. however, the bandpass voltage gain is equal to the value of q, and second order, clock tunable, bp resonator can be achieved with only 2 resistors. the filter center frequency directly depends on the external clock frequency. mode 1a is not practical for high order filters as it requires several clock frequencies to tune the overall filter response. modes 1b and 1c, figures 17 and 18, are similar. they both produce a notch with a frequency which is always equal to the filter center frequency. the notch and the center frequency can be adjusted with an external resistor ratio.
ml2111 15 table 2. second order functions mode bp a , bp b n/ap/hp a , n/ap/hp b f c f z 6a lp hp f r2 r3 clk 100 50 () ? 6b lp lp f r2 r3 clk 100 50 () ? 7lpap f r2 r3 clk 100 50 () ? f r2 r3 clk 100 50 () ? mode lp a , lp b bp a , bp b n/ap/hp a&b f 0 f n 1 lp bp notch f clk 100 50 () f 0 1a lp bp bp f clk 100 50 () 1b lp bp notch f r rr clk 100 50 1 6 56 () ?+ + f r rr clk 100 50 1 6 56 () ?+ + 1c lp bp notch f r rr clk 100 50 6 56 () ? + f r rr clk 100 50 6 56 () ? + 1d lp bp f clk 100 50 () 2 lp bp notch f r2 r clk 100 50 1 4 () ?+ f clk 100 50 () 2a lp bp notch f r2 r r rr clk 100 50 1 4 6 56 () ?+ + + f r rr clk 100 50 1 6 56 () ?+ + 2b lp bp notch f r2 r r rr clk 100 50 4 6 56 () ?+ + f r rr clk 100 50 6 56 () ? + 3lp bphp f r2 r clk 100 50 4 () ? 3a lp bp notch f r2 r clk 100 50 4 () ? f r r clk h l 100 50 () ? 4lp bp ap f clk 100 50 () 4a lp bp ap f r2 r clk 100 50 4 () ? 5lp bpcz f r2 r clk 100 50 1 4 () ?+ f r2 r clk 100 50 1 4 () ?- table 1. first order functions.
ml2111 16 figure 17. mode 1b: 2nd order filter providing notch, bandpass, lowpass figure 18. mode 1c: 2nd order filter providing notch, bandpass, lowpass figure 19. mode 1d: 2nd order filter providing bandpass and lowpass for qs greater than or equal to 1. + lp v in v+ r1 s a/b 6 15 1 (20) r3 r2 4 (17) r6 r5 + s bp s1 a 5 (16) n 3 (18) 2 (19) + lp v in v- r1 s a/b 6 15 1 (20) r3 r2 4 (17) r6 r5 + s bp s1 a 5 (16) n 3 (18) 2 (19) + lp v in v+ r1 s a/b 6 15 1 (20) r3b r2 4 (17) r3a + s bp s1 a 5 (16) n 3 (18) 2 (19) f f r rr ff clk n 00 100 50 1 6 56 =?+ + = () ; q r3 r2 r rr rk =?+ + < 1 6 56 55 ; w hf h f f r2 r on on clk 12 0 21 ?= ? =- 16 h r3 r h r2 r rrr obp olp =- = - ++ 1 1 16 5 6 ; / / 0 5 f f r rr ff clk n 00 100 50 6 56 =? + = () ; q r3 r2 r rr =? + 6 56 ; hf h f f r2 r on on clk 12 0 21 ?= ? =- 16 ; h r3 r h r2 r rrr rk obp olp =- = - + < 1 1 656 55 ; / / ; 0 5 w f f q r3 r3 h r2 r q clk a b obp 0 100 50 1 1 ==+=-? () ;; ; h r2 r v r2 r v olp n in =- - ? 11 ;
ml2111 17 figure 22. mode 2b: 2nd order filter providing notch, bandpass, lowpass + lp v in v+ r1 s a/b 6 15 1 (20) r3 r2 4 (17) r4 + s bp s1 a 5 (16) n 3 (18) 2 (19) figure 20. mode 2: 2nd order filter providing notch, bandpass, lowpass + lp v in v+ r1 s a/b 6 15 1 (20) r3 r2 4 (17) r6 r5 r4 + s bp s1 a 5 (16) n 3 (18) 2 (19) figure 21. mode 2a: 2nd order filter providing notch, bandpass, lowpass + lp v in v- r1 s a/b 6 15 1 (20) r3 r2 4 (17) r6 r5 r4 + s bp s1 a 5 (16) n 3 (18) 2 (19) f f r2 r r rr h r3 r clk obp 0 100 50 1 4 6 56 1 =?++ + =- () ;; f f r rr hf f r2 r n clk on clk =?+ + ? =- 100 50 1 6 56 2 1 2 () ;; q r3 r2 r2 r r rr =?++ + 1 4 6 56 ; hf r2 r rrr r2 r r r r on1 0 1 16 5 6 14656 ?=- ++ +++ % & ' ( ) * 16 05 05 / // ; h r2 r r2 r r r r olp = - +++ / // 1 14656 0 5 0 5 f f r2 r r rr clk 0 100 50 4 6 56 =?+ + () ; f f r rr q r3 r2 r2 r r rr n clk =? + =? + + 100 50 6 56 4 6 56 () ;; hf r2 r rrr r2 r r r r on1 0 1 656 4656 ?=- + ++ % & ' ( ) * 16 05 05 / // ; hf f r2 r h r3 r on clk obp 2 21 1 ? =- =- ;; h r2 r r2 r r r r olp = - ++ / // 1 4656 05 05 f f r2 r f f clk n clk 0 100 50 1 4 100 50 =?+= () ; () ; q r3 r2 r2 r h r2 r r2 r olp =?+ = - + 1 4 1 14 ; / / ; 0 5 h r3 r hf r2 r r2 r obp on = - ?= - + 1 0 1 14 1 ; / / ; 16 0 5 hf f r2 r on clk 2 21 ? = -
ml2111 18 operation modes (continued) the clock to center frequency ratio range is: 500 1 100 1 50 1 0 ?? f f or clk (mode 1c) (6) 100 1 50 1 100 2 50 2 0 or f f or clk ?? (mode 1b) (7) the input impedance of the s1 pin is clock dependent, and in general r5 should not be larger than 5k w for f clk < 2.5mhz and 2k w for f clk > 2.5mhz. mode 1c can be used to increase the clock-to-center-frequency ratio beyond 100:1. the limit for the (f clk /f 0 ) ratio is 500:1 for this mode. the filter will exhibit large output offsets with larger ratios. mode 1d (figure 19) is the fastest mode of operation: center frequencies beyond 20khz can easily be achieved at a 50:1 ratio. modes 2, 2a, and 2b (figures 20, 21, and 22) have notch outputs whose frequency, f n , can be tuned independently from the center frequency, f 0 . however, for all cases f n < f 0 . these modes are useful when cascading second order functions to create an overall elliptic highpass, bandpass or notch response. the input amplifier and its feedback resistors r2 and r4 are now part of the resonant loop. because of this, mode 2 and its derivatives are slower than mode 1 and its derivatives. in mode 3 (figure 23) a single resistor ratio, r2/r4, can tune the center frequency below or above the f clk /100 (or f clk /50) ratio. mode 3 is a state variable configuration since it provides a highpass, bandpass, lowpass output through progressive integration. notches are acquired by summing the highpass and lowpass outputs (mode 3a, figure 24). the notch frequency can be tuned below or figure 24. mode 3a: 2nd order filter providing highpass, bandpass, lowpass, notch ? ml2111 f f r2 r q r3 r2 r2 r clk 0 100 50 4 4 =?=? () ;; h r2 r h r r h r3 r ohp olp obp =- =- =- 1 4 11 ;; figure 23. mode 3: 2nd order filter providing highpass, bandpass, lowpass ? ml2111 + lp v in v- r1 s a/b 6 15 1 (20) r3 r2 4 (17) r4 + s bp s1 a 5 (16) hp 3 (18) 2 (19) q r2 r r3 r2 =? 4 f f r2 r f f r r clk n clk h l 0 100 50 4 100 50 =?=? () ; () ; h r2 r h r3 r h r r ohp obp olp =- =- =- 11 4 1 ;;; hff q r r h r r h on g l olp g h ohp ==? ? - ? 0 16 ; hf f r r r2 r on clk g h 2 21 ? =? ; hf r r r r on g l 1 0 4 1 ?= ? 16 + lp v in v- r1 s a/b 6 15 1 (20) r3 r2 4 (17) r4 + s bp s1 a 5 (16) hp 3 (18) 2 (19) r h r g r l external op amp notch +
ml2111 19 above the center frequency through the resistor ratio r h / r l . because of this, modes 3 and 3a are the most versatile and useful modes for cascading second order sections to obtain high order elliptic filters. for very selective bandpass/bandreject filters the mode 3a approach , as in figure 24, yields better dynamic range since the external op amp helps to optimize the dynamics of the output nodes of the ml2111. modes 4 and 5 are useful for constructing allpass res- ponse filters. mode 4, figure 25, gives an allpass response, but due to the sampled nature of the filter, a slight 0.5 db peaking can occur around the center figure 26. mode 4a: 2nd order filter providing highpass, bandpass, lowpass, allpass ? ml2111 f f r2 r q r3 r2 r2 r clk 0 100 50 4 4 =?=? () ;; h r r h r2 r oap ohp ==- 5 21 ;; h r r olp =- 4 1 ; h r3 r obp =- 1 operation modes (continued) figure 25. mode 4: 2nd order filter providing allpass, bandpass, lowpass ? ml2111 + + s bp lp v in s1 a v+ r1 = r2 s a/b 6 15 5 (16) ap 3 (18) 2 (19) 1 (20) r3 r2 4 (17) f f o clk = 100 50 05 ; q r r = 3 2 ; h r r oap = - 2 1 ; h olp =- 2 ; h r r obp = - 2 3 2 frequency. mode 4a (figure 26) gives a non-inverting output, but requires an external op amp. mode 5 is recommended if this response is unacceptable. mode 5 (figure 27) gives a flatter response than mode 4 if r1 = r2 = 0.02 r4. modes 6 and 7 are used to construct 1st order filters. mode 6a (figure 28) gives a lowpass and a highpass single pole response. mode 6b (figure 29) gives an inverting and non-inverting lowpass single pole filter response. mode 7 (figure 30) gives an allpass and lowpass single pole response. + + lp v in v- r1 s a/b 6 15 1 (20) r3 r2 4 (17) r4 + s bp s1 a 5 (16) hp 3 (18) 2 (19) 2r r5 r external op amp
ml2111 20 figure 29. mode 6b: 1st order filter providing lowpass ? ml2111 figure 30. mode 7: 1st order filter providing allpass, lowpass ? ml2111 figure 27. mode 5: 2nd order filter providing numerator complex zeroes, bandpass, lowpass ? ml2111 figure 28. mode 6a: 1st order filter providing highpass, lowpass ? ml2111 + lp v in v+ r1 s a/b 6 15 1 (20) r3 r2 4 (17) r4 + s bp s1 a 5 (16) cz 3 (18) 2 (19) + + s lp v in s1 a v- r1 s a/b 6 15 5 (16) hp 3 (18) 2 (19) 1 (20) r3 r2 4 (17) f f r2 r f f r r clk z clk 0 100 50 1 410050 1 1 4 =?+=?- () ; () ; q r3 r2 r2 r q r3 r r r z =?+ =?- 1 41 1 1 4 ;; h r3 r2 r2 r hf rr rr2 obp oz =?+ ?= - + 1 1 0 411 41 ; / / ; 16 05 0 5 hf f r2 r h r2 r r2 r oz clk olp ? == + + 21 11 14 ; / / 05 0 5 + v- s a/b 6 15 1 (20) r3 r2 4 (17) v in + s lp2 s1 a 5 (16) lp1 3 (18) 2 (19) + v in v- r1 = r2 s a/b 6 15 1 (20) r3 r2 = r1 4 (17) + s lp s1 a 5 (16) ap 3 (18) 2 (19) f f r2 r3 hh r3 r2 c clk olp olp =? ==- 100 50 1 12 () ;; f f r2 r3 h r3 r h r2 r c clk olp ohp = ? =- =- 100 50 1 1 () ;; ff f r2 r3 h r2 r3 pz clk olp == ? =?- 100 50 2 () ; |gain at output| = 1 for 0 2 ?? f f clk
ml2111 21 figure 32. cascasding 2 sections connected in mode 1, each with q = 10, to obtain a bandpass filter with q = 15.5, and f 0 = 150khz (f clk = 7.5mhz). 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 lp a bp a hp a inv a s1 a s a/b v a + v d + lsh clk a lp b bp b hp b inv b s1 b agnd v a - v d - 50/100 clk b r31 r21 r32 r22 v in 1v p-p 5v clock 5mhz 5v -5v v out 1% resistor values r21 = 3746 w r31 = 2003 w r22 = 1996 w r32 = 2604 w q1 = 0.541 q2 = 1.302 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 lp a bp a hp a inv a s1 a s a/b v a + v d + lsh clk a lp b bp b hp b inv b s1 b agnd v a - v d - 50/100 clk b r31 r21 r32 r22 v in 2.82v p-p (1v rms ) 5v clock 7.5mhz 5v -5v v out resistor values r11 = 20k w r21 = 2k w r31 = 20k w r12 = 20k w r22 = 2k w r32 = 20k w r11 r12 q1 = q2 = 10 figure 31. 4th order, 100khz lowpass butterworth filter obtained by cascading two sections in mode 1a. 0 C10 C20 C30 C40 C50 C60 C70 C80 v out /v in (db) frequency (hz) 10k 100k 1m 101,777hz C3.058db 0 C10 C20 C30 C40 C50 C60 C70 C80 v out /v in (db) frequency (hz) 10k 100k 1m 149,871hz C0.31db
ml2111 22 figure 33. cascading two sections in mode 1d, each with q =1, (independent of resistor ratios) to create a sharper 4th order lowpass filter. figure 34. notch filter with q = 50 and f 0 = 130khz. this circuit uses side a in mode 1d and the side b op amp to create a notch whose depth is controlled by r31. the notch is created by subtracting the bandpass from v in . the bandpass of side a is subtracted using the op amp of side b. 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 lp a bp a hp a inv a s1 a s a/b v a + v d + lsh clk a lp b bp b hp b inv b s1 b agnd v a - v d - 50/100 clk b r11 r21 r12 r22 v in 1v p-p 5v clock 7.51mhz 5v -5v v out resistor values r11 = r21 = r12 = r22 = 2.0k w 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 lp a bp a hp a inv a s1 a s a/b v a + v d + lsh clk a lp b bp b hp b inv b s1 b agnd v a - v d - 50/100 clk b r31 r24 r32 r21 v in 2.82v p-p 5v clock 6.5mhz 5v -5v v out 1% resistor values r21 = r22 = r23 = r24 = 2k w r31 = 80k w r32 = 4.9k w r34 = 100 w r22 r23 r34 10 0 C10 C20 C30 C40 3C50 C60 C70 v out /v in (db) frequency (hz) 10k 100k 1m 166,224hz C3.121db 0 C5 C10 C15 C20 C25 C30 C35 C40 C45 C50 v out /v in (db) frequency (khz) 127 133 130 129,070hz
ml2111 23 operation modes (continued) mode 1a is a good choice when butterworth filters are desired since they have poles in a circle with the same f 0 . figure 31 shows an example of a 4th order, 100khz lowpass butterworth filter clocked at 5mhz. a monotonic passband response with a smooth transition band results, showing the circuit's low sensitivity, even though 1% resistors are used which results in an approximate value of q. figure 32 gives an example of a 4th order bandpass filter implemented by cascading 2 sections, each with a q of 10. this figure shows the amplitude response when f clk = 7.5mhz, resulting in a center frequency of 150khz and a q of 15.5. figure 33 uses mode 1d of a 4th order flter where each section has a q of 1, independent of resistor ratios. in this mode, the input amplifier is outside the damping (q) loop. therefore, its finite bandwidth does not degrade the response at high frequency. this allows the amplifier to be used as an anti-aliasing and continuous smoothing fliter by placing a capacitor across r2. offsets switched capacitor integrators generally exhibit higher input offsets than discrete rc integrators. these offsets are mainly the charge injection of the cmos switchers into the integrating capacitors. the internal op amp offsets also add to the overall offset budget.figure 35 shows half of the ml2111 filter with its equivalent input offsets v os1 , v os2 , & v os3 . the dc offset at the filter bandpass output is always equal to v os3 . the dc offsets at the remaining two outputs (notch and lp) depend on the mode of operation and external resistor ratios. table 3 illustrates this. it is important to know the value of the dc output offsets, especially when the filter handles input signals with large dynamic range. as a rule of thumb, the output dc offsets increase when: 1. the qs decrease 2. the ratio (f clk /f o ) increases beyond 100:1. this is done by decreasing either the (r2/r4) or the r6/(r5 + r6) resistor ratios. + + s 15 5 v os1 3 2 1 4 + v os3 v os2 (18) (17) + + + + (16) (19) (20) figure 35. equivalent input offsets of ? of an ml2111 filter.
ml2111 24 mode v osn v osbp v oslp n/ap/hp a , n/ap/hp b bp a , bp b lp a , lp b 1, 4 v os1 [(1/q) + 1 + ||h olp ||] C v os3 /q v os3 v osn C v os2 1a v os1 [1 + (1/q)] C v os3 /q v os3 v osn C v os2 1b v os1 [(1/q)] + 1 + r2/r1] C v os3 /q v os3 ~(v osn C v os2 ) (1 + r5/r6) 1c v os1 [(1/q)] + 1 + r2/r1] C v os3 /q v os3 ~v v rr rr osn os - + + 2 56 526 16 1d v os1 [1 + r2/r1] v os3 v osn C v os2 C v os3 /q 2, 5 [v os1 (1 + r2/r1 + r2/r3 + r2/r4) C v os3 (r2/r3)] [r4/(r2 + r4)] + v os2 [r2/(r2 + r4)] v os3 v osn C v os2 2a [v os1 (1 + r2/r1 + r2/r3 + r2/r4) C v os3 (r2/r3)] rk r2 r k v r2 r2 r k k r rr os 41 41 41 6 56 2 + ++ ! " $ # # + ++ ! " $ # # = + 16 16 16 ; v os3 ~v v rr rr osn os - + + 2 56 526 16 2b [v os1 (1 + r2/r1 + r2/r3 + r2/r4) C v os3 (r2/r3)] rk r2 r k v r2 r2 r k k r rr os 4 44 6 56 2 16 16 16 + ! " $ # # + + ! " $ # # = + ; v os3 ~v v r r osn os -+ 2 1 5 6 16 3, 4a v os2 v os3 v r r r r2 r r3 v r r2 v r r3 os os os 123 1 4 1 44 4 4 +++ ! " $ # - - table 3.
ml2111 25 physical dimensions inches (millimeters) seating plane 0.240 - 0.260 (6.09 - 6.61) pin 1 id 0.295 - 0.325 (7.49 - 8.26) 1.010 - 1.035 (25.65 - 26.29) 0.016 - 0.022 (0.40 - 0.56) 0.100 bsc (2.54 bsc) 0.008 - 0.012 (0.20 - 0.31) 0.015 min (0.38 min) 20 0o - 15o 1 0.055 - 0.065 (1.40 - 1.65) 0.170 max (4.32 max) 0.125 min (3.18 min) 0.060 min (1.52 min) (4 places) package: p20 20-pin pdip seating plane 0.291 - 0.301 (7.39 - 7.65) pin 1 id 0.398 - 0.412 (10.11 - 10.47) 0.498 - 0.512 (12.65 - 13.00) 0.012 - 0.020 (0.30 - 0.51) 0.050 bsc (1.27 bsc) 0.022 - 0.042 (0.56 - 1.07) 0.095 - 0.107 (2.41 - 2.72) 0.005 - 0.013 (0.13 - 0.33) 0.090 - 0.094 (2.28 - 2.39) 20 0.007 - 0.015 (0.18 - 0.38) 0o - 8o 1 0.024 - 0.034 (0.61 - 0.86) (4 places) package: s20 20-pin soic
ml2111 26 ds2111-01 ordering information micro linear corporation 2092 concourse drive san jose, ca 95131 tel: (408) 433-5200 fax: (408) 432-0295 ? micro linear 1999. is a registered trademark of micro linear corporation. all other trademarks are the property of their respective owners. products described herein may be covered by one or more of the following u.s. patents: 4,897,611; 4,964,026; 5,027,116; 5,281,862; 5,283,483; 5,418,502; 5,508,570; 5,510,727; 5,523,940; 5,546,017; 5,559,470; 5,565,761; 5,592,128; 5,594,376; 5,652,479; 5,661,427; 5,663,874; 5,672,959; 5,689,167; 5,714,897; 5,717,798; 5,742,151; 5,747,977; 5,754,012; 5,757,174; 5,767,653; 5,777,514; 5,793,168; 5,798,635; 5,804,950; 5,808,455; 5,811,999; 5,818,207; 5,818,669; 5,825,165; 5,825,223; 5,838,723; 5.844,378; 5,844,941. japan: 2,598,946; 2,619,299; 2,704,176; 2,821,714. other patents are pending. micro linear makes no representations or warranties with respect to the accuracy, utility, or completeness of the contents of this publication and reserves the right to makes changes to specifications and product descriptions at any time without notice. no license, express or implied, by estoppel or otherwise, to any patents or other intellectual property rights is granted by this document. the circuits contained in this document are offered as possible applications only. particular uses or applications may invalidate some of the specifications and/or product descriptions contained herein. the customer is urged to perform its own engineering review before deciding on a particular application. micro linear assumes no liability whatsoever, and disclaims any express or implied warranty, relating to sale and/or use of micro linear products including liability or warranties relating to merchantability, fitness for a particular purpose, or infringement of any intellectual property right. micro linear products are not designed for use in medical, life saving, or life sustaining applications. part number temperature range package ML2111CCP (eol) 0c to 70c 20-pin pdip (p20) ml2111ccs 0c to 70c 20-pin soic (s20) ml2111cip (obs) -40c to 85c 20-pin pdip (p20)

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