1 publication order number : la3161/d www.onsemi.com ? semiconductor components industries, llc, 2014 august 2014 - rev. 0 ordering information see detailed ordering and shipping inform ation on page 7 of this data sheet. la3161 features ? on-chip 2 preamplifiers ? good ripple rejection owing to on-chip voltage regulator ? minimum number of external parts required ? low noise ? 8-pin sip package facilitating easy mounting ? pin-compatible with la3160 specifications absolute maximum ratings at ta = 25 ? c parameter symbol conditions ratings unit maximum supply voltage v cc max 18 v allowable power dissipation pd max 200 mw operating temperature topr ? 20 to ? 75 ? c storage temperature tstg ? 40 to ? 125 ? c recommended operating conditions at ta = 25 ? c parameter symbol conditions ratings unit supply voltage v cc 9v load resistance p l 10k ?? electrical characteristics at ta = 25 ? c, v cc = 9v, r l = 10k ? , rg = 600 ? , f = 1khz, nab parameter symbol conditions ratings unit min typ max current dissipation i cc 6.5 8.0 ma voltage gain vg closed loop 35 db open loop, v o = 0.77v 70 78 db output voltage v o thd = 1% 1.0 1.3 v total hamonic distortion thd v o = 0.5v 0.05 0.30 % input resistance r i 70k 100k ?? equivalent input noise voltage v ni rg = 2.2k ? 1.2 2.0 ? f crosstalk ct rg = 2.2k ? ? 50 ? 65 db ripple rejection rr ? 40 db monolithic linear ic 2-channel preamplifier for car stereo stresses exceeding those listed in the maximum ratings table may damage the device. if any of these limits are exceeded, device functionality should n ot be assumed, damage may occur and reliability may be affected. functional operation above the stresses listed in the recommended operating ranges is not implied. extended exposure to stresses beyond the recomme nded operating ranges limits may affect device r eliab ility. product parametric performance is indicated in the electrical characteristics for the listed test conditions, unless otherwise noted. product per formance may not be indicated by the electrical characteristics if operated under different conditions. sip8 22x4.5 / sip8
la3161 www.onsemi.com 2 package dimensions unit : mm block diagram amp1 amp2 nf1 nf2 input2 input1 4 5 requlated voltage circuit output1 output2 3 6 1 2 8 7 gnd v cc sip8 22x4.5 / sip8 case 127ag issue o
la3161 www.onsemi.com 3 test circuit1 : v o , vg, thd, i cc , r i test circuit2 : vg o test circuit3 : noise sample application circuit 1 : preamplifier for car stereo c5 47 f r2 100k v cc = 13.2v ch1 out ch2 out + 1 8 4 2 3 6 7 5 + ch1 in in ch2 10v 1000pf c1 1000pf c3 + 10v 6.3v + 10v + 10v + r1 r4 100k r3 6.3v + 16v la3161 c6 c10 150 0.015 f 7.5k c2 10 f c4 10 f 0.015 f c9 10 f 100k r5 r7 100k c11 47 f r6 7.5k c7 10 f c8 47 f v cc gnd out out ++ la3161 + r7 r2 + + + + c1 1000pf c3 1000pf in gnd in 87 6 5 4321 c9 10 f 10v c7 10 f 10v c8 47 f 16v r4 100k r3 7.5k r5 100k r6 7.5k r1 150 0.015 f c6 0.015 f c10 c11 47 f 6.3v c5 47 f 6.3v c2 10 f 10v c4 10 f 10v 100k 100k
la3161 www.onsemi.com 4 function of external parts c 2 , c 4 are input coupling capacitors. in nab equalizer amplifie r, the gain at low frequencies is high and 1/f noise inside the ic is emphasized as output no ise. therefore, if the r eactance of capacitor at low frequencies is increased, the dependence of 1/f noise on the signal source resistance causes the output noise voltage to deteriorate, and the value of reactance must be made small enough as compared with the si gnal source resistance. c 2 , c 4 also influence the operation start time and the adequa te value of these capacitors is 10 ? f. (since c 2 , c 4 of less than 4.7 ? f make the operation start time longer, use c 2 , c 4 , of 4.7 ? f or more). c 5 , c 11 are nf capacitors. the lower cut-off frequenc y depends on the value of these capacitors. if the lower cut-off frequency is taken as f l : c5 (c11) = 1/2 ? f l r2 (r7) if the value of this capacitor is made larger, the operation star t time of amplifier is more delayed. the adequate value of capacitor is 47 ? f. the frequency characteris tic of the equalizer amplifier depends on c 6 and r 4 , r 3 (c 10 and r 5 , r 6 ). the time constants to obtain the standard nab characteristic are as shown below. tape speed 9.5cm/s 4.75cm/s c6 (r3 ? r4) 3180 ? s 1590 ? s r3 c6 90 ? s 120 ? s c 8 is bias capacitor for the power line. c 8 of 47 ? f is inserted at a point as close to the power supply pin (pin 4) as possible. c 1 , c 3 are for preventing radio interference in the strong electr ic field, interference attributable to engine noise, and blocking oscillation at the time of large amplitude operation. the adequate value of c 1 , c 3 is approximately 1000pf. c 7 , c 9 are output coupling capacitors. the adequate value of c 7 , c 9 is 10 ? f. nab element and determination of gain since the dc feedback is provided by r 1 , r 2 of nab element, which brings about dc output potential at pins 3, 6, it is impossible to change the value of r 1 , r 2 of nab element greatly. therefore, when determining the gain, change r nf with r 1 , r 2 , c 1 (nab element) kept constant. (1) how to obtain r nf impedance z of nab element is z = 1 1/r1 + j ? c1 + r2 = (r1 + r2) ? ? ? ? ? ? 1 + j ? c1{r1 r2/(r1 + r2)} 1 + j ? c1r1 for a general negative feedback amplifier circuit, a = ao/ (1 + ao ? ) applies, and z = a r nf is obtained under conditions of ao>>a, a>>1 ( ?? = r nf / (r nf + z), ao = open-loop gain, a = feedback gain). therefore, we can use an approximation of r nf = z/a. a = (vg for 1khz) times, (set r 1 , r 2 at approximately 100k ? ) each time constant of nab characteristic. tape speed 9.5cm/s 4.75cm/s t1 c1, r1 3180 ? s 1590 ? s t2 c1 (r1//r2) 90 ? s 120 ? s (2) examples of nab constants (a) tape speed : 9.5cm/s. (8 tracks) vg : r nf (vg/f = 1khz) vg 30 35 40 db r nf 180 100 56 ??
la3161 www.onsemi.com 5 (b) tape speed : 4.75cm/s. (cassette) vg : r nf vg 30 35 40 db r nf 440 240 130 ?? (c) flat amplifier vg : r nf vg 30 35 40 db r nf 3.2 1.8 1 k ? proper cares in using ic 1. maximum rating if the ic is used in the vicinity of the maximum rating, even a slight variation in conditions may cause the maximum rating to be exceeded, thereby leading to a breakdown. allo w an ample margin of varia tion for supply voltage, etc. and use the ic in the range where the maximum rating is not exceed. 2. short between pins if the supply voltage is applied when the space between pins is shorted, a breakdown or deterioration may occur. when installing the ic on the board or applying the supply voltage, make sure that the space between pins is not shorted with solder, etc. 3. breakdown of ic attributable to inverted insertion if the ic is inserted inversely and operated, the ic may suffer from something unusual, thereby leading to a breakdown or deterioration of the ic. when installing the ic on the boar d or operating the ic, check the marked surface of ic. proper cares to be taken for obtaining optimum operation of ic ? set dc resistance of r 1 , r 2 of nab element at approximately 100k ? . ? determine the gain by changing r nf without chaging nab constant (refer to examples of nab constant.). jk316108 2 3 5 7 0.1 5 10 100 23 5 1.0 23 5 0.1 23 5 2 3 5 7 1.0 2 3 5 output voltage, v o -- v input voltage, v i -- mv f = 100hz 1khz 10khz v o -- v i v cc = 9v r l = 10k rg = 600 vg = 35db / 1khz 3 5 0.1 5 1.0 0.1 23 5 2 3 5 total harmonic distortion, thd -- % output voltage, v o -- v 1.0 2 3 5 10 2 3 772 3 1khz 100hz f = 10khz thd -- v o jk316110 v cc = 9v r l = 10k rg = 600 vg = 35db / 1khz 5 7 1.0 5 10 1 23 5 2 3 5 7 10 2 3 77 100 23 57 2 filter output amp vg = 45db flat amp la3161 input rg vg = 35db v ni -- rg jk316111 v cc = 9v r l = 10k 15hz to 30khz signal source resistance, rg -- k equivalent input noise voltage, v ni -- v jk316109 frequency, f -- hz 60 100 2 3 5 20 30 40 50 80 90 1k 2 3 5 10k 2 3 5 100k 23 5 9.5cm/sec 70 vg -- f without nfb with nfb (nab) v cc = 9v r l = 10k rg = 600 c nf = 100 f (100 short) 47 f (100 short) voltage gain,vg --db
la3161 www.onsemi.com 6 100 23 5 -70 -60 -50 -40 -30 -20 10 1k 23 5 10k 23 5 100k 23 5 crosstalk, ct -- db frequency, f -- hz la3161 crosstalk level cross talk -- f v cc = 9v v o = 0dbm jk316112 v cc = 9v r l = 10k rg = 2.2k v o = 0dbm / 0.775v r l 10k r l 10k r g 2.2k 4 6 16 18 20 0 1 2 3 4 5 6 0 2 8 10 12 14 7 8 9 10 60 62 64 66 68 70 72 74 76 78 80 current dissipation, i cc -- ma supply voltage, v cc -- v voltage gain, vgo -- db vgo, i cc -- v cc vgo i cc jk316114 r l = 10k f = 1khz rg = 600k vg = 35db 4 6 16 18 20 0 0.2 0.4 0.6 0.8 1.0 1.2 0 2 8 10 12 14 1.4 1.6 1.8 2.0 output voltage, v o -- v supply voltage, v cc -- v v o -- v cc v o (thd = 1%) jk316116 r l = 10k f = 1khz rg = 600 vg = 35db 22357 357 100 1k 20 25 30 35 40 45 50 voltage gain, vg -- db (cassette) vg -- r nf (8 tracks) jk316118 feedback resistance, r nf -- r nf 47 f 7.5k 100k 0.033 f 0.015 f r nf 47 f 7.5k 100k 22357 357 1k 10k 20 25 30 35 40 45 50 voltage gain, vg -- db input output v cc la 3161 jk316119 vg -- r nf feedback resistance, r nf -- 10 f10 f 47 f 47 f r nf 100k ambient temperature, ta -- c 020 100 0.4 0.6 0.8 1.0 1.2 -40 -20 40 60 80 1.4 1.6 1.8 output voltage, v o -- v jk316117 v o -- ta v cc = 9v r l = 10k rg = 600 f = 1khz vg = 35db / 1khz 020 100 66 68 70 72 74 76 -40 -20 40 60 80 78 80 82 4 5 6 7 8 9 10 11 12 voltage gain, vgo -- db current dissipation, i cc -- ma jk316115 vgo, i cc -- ta vgo i cc ambient temperature, ta -- c v cc = 9v r l = 100k rg = 600 vg = 35db / 1khz frequency, f -- hz 100 100 23 5 2 3 5 7 10 1k 23 5 10k 23 5 100k 23 5 2 3 jk316113 r i -- f input resistance, r i -- k v cc = 9v r l = 10k rg = 600 vg = 35db / 1khz v o = 0dbm v o (thd = 1%)
la3161 www.onsemi.com 7 on semiconductor and the on logo are registered trademarks of semiconductor components industries, llc (scillc) or its subsidiaries in the united st ates and/or other countries. scillc owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. a lis ting of scillc?s product/patent coverage may be accessed at www.onsemi.com/site/pdf/patent-marking.pdf . scillc reserves the right to make changes with out further notice to any products herein. scillc makes no warranty, representation or guarantee regarding the suitability of its products for any parti cular purpose, nor does scillc assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. ?typical? parameters which may be provided in scillc data sheets and/or specific ations can and do vary in different applications and actual performance may vary over time. all operating parameters, including ?typicals? must be validated fo r each customer application by customer?s technical experts. scillc does not convey any license under its patent rights nor the rights of others. scillc pro ducts are not designed, intended, or authorized for use as com ponents in systems int ended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the scillc product could create a situation where personal injury or death may occur. should buyer purchase or use scillc products for any such unintended or unauthorized application, buyer shall indemnify and hold scillc and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees ar ising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that sci llc was negligent regarding the design or manufacture of the part. scillc is an equal opportunity/affirmative action employer. this literature is subject t oall applicable copyright laws and is not for resale in any manner. output voltage, v o -- v jk316120 80 100 160 0.2 0.4 0.6 0.8 1.0 40 60 120 140 1.2 1.4 1.6 v o -- r dc v cc = 9v r l = 10k f = 1khz thd = 1% feedback resistance, r dc -- k input output la 3161 v cc r dc 10 f 100 10 f 47 f 10k 47 f ordering information device package shipping (qty / packing) LA3161-E sip8 22x4.5 / sip8 (pb-free) 25 / fan-fold
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