ࡱ> mol` R|bjbjss23zzzzzzz<R        MOOOOOO$Dh :sz  szz  ggg z z MgMggzzg  }gM"0Rg  gg zP |g< d    ss]    R$zzzzzz ADIT{KN`7hg^NUOeg^Nh>e'YhV-NeHr Nh>e'YhVSNb:N`>e'YhV]wQ{-N^8^[5vDn0e`/f(WKmϑN*N_\vOS؏/fN*NYRv|~MRz Nh>e'YhV/f`]wQ{-Ne'YhV0N[vR0HQ bNN~1u$N*Nb N*NЏ{>e'YhVg^Nh>e'YhVvW@xwƋ06qT bN؏[Ty~gvO0:pTQ0gT,bN؏\[hQƖbvNh>e'YhVvgb v^N\ُy>e'YhVv'`T]g^v>e'YhVv'`ۏLk0 `}Y,YUOg &^ gOPnvNh>e'YhV5u? bNvNh>e'YhV gN*N{SNvc[bُ*NR0Yg]-d^ Sc0Wv{v5uS1\SN[bOPn5uSv Nh>e'YhV[5un5uSvBlUS5unLTYg5uly `HNYt"" gNNh>e'YhV/fSNO(uUS5unO5uv YAD623.Ygy O(uSYvy5u0 Nh>e'YhVO(uǏ z gNlaNyYAD526 AD602 AD526 AD602/fVGA eSSXv>e'YhV NNߍNh>e'YhVvSt/f N Tv0N,Nh>e'YhVlav1\/feQqQ!j5uS NǏ'Y ؏ geQTQvFdE^^(WO5u5uSvShKN0 YUOǑ(uNhЏ>egbNAmR`[5uAmn,(uNuir;bxvz,Bl5uAmE^e'YhVveQOS__1_,ADIvNh>e'YhV(W>e'Y_1_OSTYtjVeb gUOr0RKNY? Nh>e'YhVvOp(WN[veQ;b_ؚ Te/f]ReQ v^NcO^8^ؚvqQ!jb6Rk0 `}Y pN N`ONO NONN`ON(W^~vePG0RNNHN7hv S/f`HNS㉳QvbT ^~[N5ueg/f_sQ.v ADI gYُebvDeSNO`OS0 N(WNNADI~~vxO N_NON蕨dk{|v0Y`O gtQ SNSemail0Rchina.support@analog.com"}SvsQDe0 Te`sQlADI>NRvxO `0ReSNb TSR0 b&T(u3.3VUS5unO5uvNh>e'YhVAD627 >e'Y0~40mV(0.1VqQ!j5uS Szc0W)v]ROS0R0~2.4V~'`^`7h gl gvQNvSUS5unO5u0~'`^o}YvfNNT"" ^/fl gNHNv0`؏SN wN NAD623 Nvb,gkNO0 OahV>e'YhVvp/fNHN 10nNOjVXvch20ؚvqQ!jb6Rk30Yv>e'Y Ppe40RN:\[ \10^370_[~OS>e'Yv݋(uAD623SNTAD623TAD620(Wُ*N^(u-Nv:S+R/fNHN AD623S>e'Y5uSOS `lSb5uSOS0lav/fqQ!j5uS NQV AD623 AD620R Nl g,g(:S+R S/fwQSOSpe g N T0`SNkN NpencKbQ 1.>UOy`Q NO(uNhЏ>ekvQ[Џ>ewQ gf'YOR? 2.>NhЏ>e(W^(u-NlaTNNy? 3.>US5unvNhЏ>e(W-N^MQvNy? 1. (Differential input) Small signal with high common mode voltage. High source impedance.2. Pay attention to common mode range (say, if higher than +/-15V, then need AD628 or AD629 type difference amp), PCB layout (symitic layout, its easier for AD8221) to get high CMRR.3. Common mode voltage is positive, not go to negative (unless specified by datasheet). For examples, AD623 at +5V power supply, input range is -0.15V to 4.85V. Nh>e'YhV8^OS0Re~sr^pb YUOQ\ُyr^pbv Use EMI filter. AD8556 has some build in EMI filter. (WNh>e'YhVvrefzvccS5uS}Y ؏/fǏN*NUSЏ>egbvߍhVHeg}Y:NNHN""0 V:NREFzv^ N'YveQ5uAm _N N;b9SM @bNvccS5uS1\SNv0(WNh>e'YhV-N YUOMNO5un_wvjVX 10Ǒ(u]ReQ020Ǒ(uTv[0WT[VDDv&T5u[0(WevAD8xxx|R-N gSNfNAD625vWST l g[hQN7hv NǏAD8250SNcO1 2 5 10vXv b0 Nh>e'YhVoy勂YUOQT㉳Q? 1uNNh>e'YhV@bYCQN_\ @bN[N)n^oyeg dNNh>e'YhV,gv)n^oy]Y Y@bcXvn5u;v)n^|peksQ.0[NADIveNTYAD8230 1uNvQǑ(uNelb/g N$N*N5u;kOnXvv @bN[voy_\0 Nh>e'YhVveQ~(WPCB^@\e^laNHN,YUOMb go}YvjV'`? N,OeQzvOSI{1\SN YgQ0RRFIr^pb SNQSAD8221pencKbQvFigure 49 1.PCBvOSYUO^Nh>e'YhVvb/gch(kYjVX) 10Yg/f$Ng>e'Y la(WMRN~=\ϑQjV0 20Yg/f5unjVX ;N/fǑ(u]R T[0W&T5u[I{eg[s0 30(WOS-NRN~nl Nh>e'YhVv N&^>e'YhV0ADlbchVvUSGrOSthVv gNHN:S+R `/fcQ5uv ؏/f[Nv^(uKNv N TYg/fQ萄v >e'YhV+ADCvQfYvvNr^pbv0[N^(ueg ƖbveHhv:\[Of\ FO/f'`v[Nؚ|^vUSNh>e'YhVegO]NN0 Nh>e'YhVv]ReQ,T OahVMTO(ue,YUO[eQOPn5u?5u;pe100dB at 1kHz at gain of 10 vover the tatal VCM =  10V to +10V range (+/-15V power supply). (WAD8221veQz`7hnlhVMbg'YP^MNOjVX S_0R_vT^e? N,`Q N AD8221veQz NcnlhV NnlI{RSN>e(WAD8221TSZP0 Nh>e'YhV[nlhVl gNHNyrkvBl 1\ cgq*bbksvnlhV1\}Y0 `7h(WNh>e'YhVzte1YTXv0 Most IIA has a gain set resitor, you can choose the right resistors. That s why it s better than discrete circuit. Some parts has PGA (such as AD8251 G="1",2,4,8, AD8250 G="1",2,5,10), AD8555 (G=70~1280) YUOnSNh>e'YhV-NؚqQ!jOS? gwQSO5uT? `SNSAD8221pencKbQvFigure49 ,YUOYtNh>e'YhV^(ue@bQsvqQ/c? `@bcv/f>e'YhVQsoYg/fُ7h ُN>e'YhVvQ} gsQ Te_NS/f`v5uv0`SNb`Ov5uNS‰[0Rv~gSemail0Rchina.support@analog.com.bNv] z^O.^R`Rgv@b(W0 N[,g^Nh>e'YhVev;Np(WT̑?""!! Yg]g^Nh>e'YhV p(WNO5u;KNv9SM'` N0Rf0RvqQ!jb6Rk0 ADIvUSGrNh>e'YhV gNWS?Ne'YhV g_YNT gevؚ'`NkNT gAD8221 AD8220 AD8230 AD8250 AD8251I{I{0Ne'YhVgbScR`Amn YUO-d^00 A normal AMP can built constand current circuit to put sensor resistor between load and GND. A IIA can build constand current circuit where the sensor resistor can be put any where in the load circuit. And as IIA has good CMRR over high common mode range, so its possbile to use small sensor resistors. bs(W`[N*Ns:N1KHZ FOE^^S gQASuvv_1_OSۏL>e'Y1000 P s(WADI gNHN>e'YhV=\ϑQ\r^pbv^NeOO(ubT NMR,TAD623 s(W^ gf}YvO(u'T cPTN~0 V:N`>e'Y1000 PvXv&^[y:N1M gecQvNh>e'YhV|^ g@bcؚ FO/f'YYpeXv&^[y(W700~800K @bN؏/f~~O(uAD623k}Y Nh>e'YhVXv^~'`TNV } gsQXv^~'`YUOYt? Xv^~'`;N/f g>e'YhVQvfSO{5uv^~'`Q[ [N^~'`] _ gelSd @bN^ (u^~'`\vNh>e'YhVhVN0Yg`O]g^N>e R b^~'`\vЏ{>e'YhV0 Џ>evQwObRYUO?1udkg^vNh>e'YhV(W NYUOQǏ}R? nfЏ>evQ;bN,NO0 1udkg^vNh>e'YhV1uNǑ(u5u;SQ~ gؚvQ;b0 ㉳QNh>e'YhVv)n^ؘy, gUOY?NQebeQKb? (u)no\vXvn5u;0O(uAD8230wQ geleQ~T:NNO)noyr+RvNh>e'YhV0 AD8251TAD8250 s(W7hGrQegNHNSN3u0RHN AD8250]ϑN0AD8251؏*gϑN T|ADINtFU3u7hGr0 Nh>e'YhVT OahVMTO(ue,YUOۏL? IIA normally has very low offset, so there is no need to add just the offset of the IIA (for example, AD8221 has 25 V max input offset voltage, 0.3 V/C max input offset drift). For the sensor, if you can gurantee senor s ouput is differential to IIA, then common mode voltage will be reject by IIA s high CMRR. ADIyNh>e'YhVT(u(Wؚ|^,ؚeQ;b,ؚqQ!jb6Rkvuir;Sf[Nh AD8220 [veQ~:NJFET eQ;bؚ TeqQ!jb6Rk_N^8^ؚ (uNuir;Sf[Nh0 OahVQv1mv^35mvVv5uS ~>e'YTeQADC >e'YhVv b^laNHN Yg/fqQ!j5uSk'YvOS HN bCMRRkؚvNh>e'YhV0 Nh>e'YhV8^OS0Re~sr^pb YUOQ\ُyr^pbv SAD8221pencKbQvfigure49 V ADIvNh>e'YhVveQ5uAm/5uS1YNSqQ!jb6Rk,s(W0RNHN7hv4ls^? Good new IIA has high CMRR at both DC and some frequency range (AD8221 spec at 10k HZ).AD8221 CMRR DC to 60 Hz with 1 k? Source Imbalance (VCM = 10 V to +10 V)G = 1 80(Agrade), 90(B grade) 80(C grade) dBG = 10 100 110 100 dBG = 100 120 130 120 dBG = 1000 130 140 130 dBCMRR at 10 kHz (VCM = 10 V to +10 V )G = 1 80 80 80 dBG = 10 90 100 90 dBG = 100 100 110 100 dBG = 1000 100 110 100 dB Nh>e'YhVvXv,YUOOQs^~'`?YgQs^~'`,YUOۏLYtbeP? NUO~'`|~ N/ft`v0VdkO g^~'`vch Y:1-dB S)pbIIP3I{0Ov >e'YhV/f1uvfSO{gb vfSO{]\O(WvAm]\Ope [\OSv>e'Y \vQƉ:N~'`|~0FO\OSvX'Y OvQۏeQqT:Sb*bbk:S Vdk1\Qs^~'`0Qs^~'`e HQQǑ(uTv>e'YhV0 NAmCMRRTvAmCMRR[wQSO^(u gNHNq_T CMRRc>e'YhV[qQ!jjVXvb6RR N{qQ!j/fNAm؏/f/eAm YgCMRRǏ\ bqQ!jjVXǏ'Y Oq_T0RQOSv|^0 b(WahV N(uǏAD624C [vG=100e:N10ppm/! 1Yoy:N0.25V/! '`N, Ne'YhVveQz/f&TۏLOb?YUOۏL? :NN5u[hQ /f(WMR~5ueReQOb [NNh>e'YhVeg SNO(uNg{eg{MOeQvqQ!jT]ROS v^SNRPAm5uegOb5u0 Nh>e'YhVYAD8221[5un gUOyr+RBl?[[5unvl~BlgNOP^Yؚ? [N5unvjVXb6RvSpe:NPSRR `SNSpencKbQ,{7uv Figure12 13 ̑b gAD8221vPSRRvSpe0 [~lBlvgNOP^SQN`[OS|^vBl(WNh>e'YhVeOS~T0W~v^@\R^^YUO[c 1\/fQ0R0W~vjVXbSOQsvjmm5uAm Q\vQ[OS~vq_T YReQ&T5u[ T5u;gbnlQ~I{0 YUOQ\]ReQvOS[Nh>e'YhVvr^pb ,geg ]ReQv[NUSzeQ vQr^pb1\\ Nh>e'YhVYUO^[5un50Hzvr^pb?ADI gُ7hvnl㉳QeHhT?[vpQ0RY\dBMbT? Nh>e'YhVv5unb6R8^_ؚ YAD8221 [v50Hz PSRR(WXv:N1e/f100dB, Xv:N1000e :N130dB0SY AD8221Nh>e'YhV؏wQ g_ؚvNAmCMRRR @bNSN[50Hz]r^pb g_}Yvb6R0 5u;v9SM/fc[v~[hrr$h;5CJKHOJQJ^JaJo(*h;h;5CJKHOJQJ^JaJo('h;h;5CJKHOJQJ^JaJ!h;CJKHOJQJ^JaJo($h;h;CJKHOJQJ^JaJ'hr~3hr~3CJKHOJQJ^JaJo(/hr~3hr~35B*CJOJQJ\^JaJph,8  6 t . ^ tJ>j$d -D1$4$M `a$gd;$d -D1$M `a$gdr~3|hj:<  \@Bhj\b&,rx fn:BDZDZDZǞǞۍy'h%h;5CJKHOJQJ^JaJ!h%CJKHOJQJ^JaJo($h;5CJKHOJQJ^JaJo(*h;h;5CJKHOJQJ^JaJo('h;h;5CJKHOJQJ^JaJ$h;h;CJKHOJQJ^JaJ!h;CJKHOJQJ^JaJo((< Bj|`$v||$d -D1$4$M WD`a$gd%$d -D1$4$M a$gd;$d -D1$4$M ^a$gd;$d -D1$4$M `a$gd; Xb 4"<"p"x"""""###$"$r$|$$$%%%%('((((h)l)n)p)))f*n***$+,+h+p++++,,f,n,,,/&/z///ɵɵɵɟɵɵɵɟɵɵɟɵɵ*h%h%5CJKHOJQJ^JaJo('h%h;5CJKHOJQJ^JaJ!h%CJKHOJQJ^JaJo($h;h;CJKHOJQJ^JaJ$h%5CJKHOJQJ^JaJo(>//00000111f1n1?34L4T4p5t5v5x55546<66677 7:7<7D7777*8,8488889$9999999::h:n:X;\;^;;;;;JJűűŞűűűűűűU$h%5CJKHOJQJ^JaJo('h%h;5CJKHOJQJ^JaJ*h%h%5CJKHOJQJ^JaJo($h;h;CJKHOJQJ^JaJ!h%CJKHOJQJ^JaJo(=bN gN*NNT-N g9ADǑ7h ADMRvЏeTnlhVNR+R/fOP200GS,MAX307CWI,AD795,AD797BR,ADC(uv/fAD7862 s(WG0Rv/f9*NSv|^ NY [9SN'` NY 9eN*Neb NKb9eۏ"" AD7862 is Simultaneous Sampling Dual 250 kSPS 12-Bit ADC with two 2:1 MUX. If every channel is exactly the same, then it should be OK. The issue may comes from MAX307 differential MUX because it has big on resistor (100 Ohm) and it drift with temperature and varied with frequecy, you need high input impedance after MAX307 (or ADG1207). Various in the amplifiers on each channel is also a issue (difference in gain by mismatch of resistors, big offset amplifiers has different offset, offset drifter, etc). A new part is AD7658 (6ch simulteneous sampling 12bit ADC, AD7656 is 6ch 16bits). If you use 2pcs, then no MUX need. Then it s easier to get good channel match. Here you can use OP2177 (Low Offset Voltage: 60 V Max,Very Low Offset Voltage Drift: 0.7 V/C Max) YgibEQUSGrNh>e'YhVv'`,YUOYteQ~TQ~MbcؚteSO'` N/fMNO'`? If you use IC in your application, then choose a good part (such as AD8221). If you mean IC design, then it s more important to make sure good match resistors, choose right input type and carefuly bias. Commplemtary design will get good performance, maybe higher cost. N~N NOP482Gv^(u OP482vRNO TeeQ;bؚ OPn5uAm\ Vdk[SN^(u(WNNO:d_vؚ;bvOStv^(u N0 >e'YhVYAD604,yr+R(WؚXv NONuo _wr^pbjV, gUOoV{? First, please do not use 1 AD604 to gain up one channel twice, it s better to use 2pcs AD8331 if you need 2 stage gain. If you use each AD604 in 2 channel, then it s ok. A new part is AD8332. Carefully PCB layout is very important. Make sure output is far away from input. Make sure good decoupling. Get a good low impedance ground plane. >e'YhVvc0WYt/fvS_ YBgv [Nؚ|[Nh>e'YhV /f&T[5un0Ws^bv gyr+RBl [0ُ1\Bl[S+T gؚ|[Nh>e'YhVvte*N5uۏL^@\010[N5u-NSOQs'Yv_sQ5uAmvCQN=\ϑ܏yNh>e'YhV020Nh>e'YhVc0W>e(W܏z b'Y5uAmvCQNbA~_sQvCQN>e(Wc0Wvяz030Nh>e'YhVc0WeReQ&T5u[0 Nh>e'YhV1uY*NЏ>e~b,[[Џ>e'`v9SM'` gUOyr+RBl? If you use 3 amplifiers to build the same function as IIA, then all resistors must be matched (exactly the same). It s easier to use 1 integrated IIA (such AD8221). Please refer to presentation. SY,ADI gl geQTQ T:NRail to RailvNh>e'YhV?N~N N!"" `SNQAD623 NveQTQ0RhvݍyS g150mV]S0 YUO[s$N*NNh>e'YhVv Tek]\O?XRNHN5ubCQN? I do not understand whay you want. The analog circuit will always gain all the input. If you circuit are exactly the same, the same length of input and output, same gain, then the 2 channel should be good matched (same amplitude, same phase delay). It s better to use dual IIA (such as AD8222) than 2pcs single IIA (such as AD8221) because dual IIA in same package has the same temperature drift. Nh>e'YhVveQ^勂YUOYtN^[ N TOSveQE^^? 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e'YhVT(u(Wؚ|^,ؚeQ;b,ؚqQ!jb6Rkvuir;Sf[Nh AD8220 Џ>eveQ1Yv N T,YNh>e'YhV gNHN7hq_T? ,{N~$N*NЏ>e1Yv N TO&^~Nh>e'YhVk'YvXv] Y*NЏ>ev'`YqQ!jb6Rkv)n^yr'` N T,O[Nh>e'YhV gNHN7hvq_T?[Nv]+Rg'YP^Bl/fY\? ,{N~$N*NЏ>evyr'` N T g~OSOs(WNh>e'YhVvXv] N g'YP^0WBlSQN`[Nh>e'YhVXv]vP^vBl YUOb6RKb:gOS[Nh>e'YhVb^Nh>e'YhV5uvr^pb [NRFIr^pb `SNSAD8221pencKbQvV49 Nh>e'YhVwQ gꁨRRT?[[syr'` gUOq_T[SYUOTOSSy Most IIA has very low offest. If use chop technology, need consider the chop frequency if the part is not good designed (please refer to AD8628 self-zero amplfier datasheet for details). If it does, please add low pass filter to remove it s impact. Nh>e'YhVveQzT OahVvQvޏc,YUOYt OahVvjV? SNReQnlhVndjVX0 Nh>e'YhVTN,vؚ'`Џ{>e'YhV gUO N T?N[~N~N N!""! N>eveQ;bؚ qQ!jb6Rkؚ >e'Yv/f]ROS0 N~N NNh>e'YhVv;N^(u(WNW Nh ;Su OahVOStI{I{0;`veg [SN(u(W['YjVXTr^pb Nvؚ;bv_1_OSvhKmv^(u N0 i plan to measure bio signals. the signals r in micro V level. the BW is about 1MHz. i need 4 channel.give me some advice for amp.thanks Most IIA is not faster enough to work at 1MHZ signal. But AD8250 (G=1,2,5,10) is fast enough (10MHZ) to gain it up. AD8250 has High CMRR (98 dB (min), *G = 10), Low gain drift(10 ppm/C (max)), Low offset drift( 1.7 V/C (max), G = 10). If you need high gain and low noise, AD8334 is a good choice (0.74nv/sqrt(Hz), 100M BW). Another low noise part is ADA4899 (Ultralow noise: 1 nV/"Hz, 2.6 pA/"Hz bandwidth: 600 MHz (G = +1)) AD627veQeRai to RailvHN[vTveQV/fY\ AD627 is rail to rail out put, not rail to rail input. It s input range is (?VS) ? 0.1 to (+VS) 1 (-5.1V to 4V at +/-5V power supply) bKmϑuirOS0_O~0RQAS_O04*NS0&^[(W1MHz0OS>e'YT (uADC Tek~U_4*NS-NOSv\Qsve

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