銆�銆�LM331鏄編鍦婲S鍏徃鐢熺敘(ch菐n)鐨勬�ц兘鍍规牸姣旇純楂樼殑闆嗘垚鑺墖,鍙敤浣滅簿瀵嗛牷鐜囬浕澹�杞�(zhu菐n)鎻涘櫒銆丄/ D 杞�(zhu菐n)鎻涘櫒銆佺窔鎬ч牷鐜囪(di脿o)鍒惰В瑾�(di脿o)銆侀暦鏅傞枔绌嶅垎鍣�鍙婂叾浠栫浉闂�(gu膩n)鍣ㄤ欢銆侺M331 閲囩敤浜嗘柊鐨勬韩搴﹁鍎熻兘闅欏熀婧栭浕璺�, 鍦ㄦ暣鍊嬪伐浣滄韩搴﹁寖鍦嶅収(n猫i)鍜屼綆鍒� 4.0V 闆绘簮闆诲涓嬮兘鏈夋サ楂樼殑绮惧害銆侺M331 鐨勫嫊鎱�(t脿i)鑼冨湇瀵�, 鍙仈 100dB 锛� 绶氭�у害濂�, 闈炵窔鎬уけ鐪熷皬浜� 0.01% ,宸ヤ綔闋荤巼浣庡埌0.1Hz鏅傚皻鏈夎純濂界殑绶氭��;璁婃彌绮惧害楂�,鏁�(sh霉)瀛�鍒嗚鲸鐜�鍙仈12浣嶏紱澶栨帴闆昏矾绨″柈锛屽彧闇�鎺ュ叆骞惧�嬪閮ㄥ厓浠跺氨鍙柟渚挎(g貌u)鎴� V/F 鎴� F/V 绛夎畩鎻涢浕璺�,骞朵笖瀹规槗淇濊瓑杞�(zhu菐n)鎻涚簿搴�銆�
|
寮曡叧铏� |
寮曡叧鍚� |
鍔熻兘 |
|
1 |
Current Output |
闆绘祦杓稿嚭 |
|
2 |
Ref Current |
鍩烘簴闆绘祦 |
|
3 |
Frequency Output |
闋荤巼杓稿嚭 |
|
4 |
GND |
鎺ュ湴 |
|
5 |
R/C |
鎺� RC 瀹氭檪闆昏矾 |
|
6 |
Thresholod |
闁惧�� |
|
7 |
Comparator Input |
姣旇純杓稿叆 |
|
8 |
VS |
闆绘簮 |
銆�銆�LM331 鐨勫収(n猫i)閮ㄩ浕璺祫鎴愬鍙冲湒鎵�绀虹敱杓稿叆姣旇純鍣�銆佸畾鏅傛瘮杓冨櫒銆丷-S 瑙哥櫦(f膩)鍣�銆佽几鍑洪﹨(q奴)鍕曠銆佸京闆舵櫠楂旂銆�
銆�銆�鑳介殭鍩烘簴闆昏矾銆佺簿瀵嗛浕娴佹簮闆昏矾銆侀浕娴侀枊闂�(gu膩n)銆佽几鍑轰繚璀风绛夐儴鍒嗙祫鎴愯几鍑洪﹨(q奴)鍕曠閲囩敤闆嗛浕妤甸枊璺舰寮�,鍥犺�屽彲浠ラ�氶亷閬告搰閭忚集闆绘祦鍜屽鎺ラ浕闃�,闈堟椿鏀硅畩杓稿嚭鑴堟矕鐨勯倧杓浕骞�,浠ラ仼閰� TTL銆丏TL 鍜� CMOS 绛変笉鍚岀殑閭忚集闆昏矾銆侺M331 鍙噰鐢ㄩ洐闆绘簮鎴栧柈闆绘簮渚涢浕,鍙伐浣滃湪 4.0锝�40V 涔嬮枔,杓稿嚭鍙珮閬� 40V,鑰屼笖鍙互闃叉 Vcc 鐭矾銆�
銆�銆�涓婂湒鏄敱 LM331 绲勬垚鐨勯浕澹撯�旈牷鐜囪畩鎻涢浕璺�傚鎺ラ浕闃� Rt 銆丆t鍜屽畾鏅傛瘮杓冨櫒銆佸京闆舵櫠楂旂銆丷-S瑙哥櫦(f膩)鍣�
銆�銆�绛夋(g貌u)鎴愬柈绌�(w臎n)瀹氭檪闆昏矾銆傜暥杓稿叆绔� Vi+杓稿叆涓�姝ｉ浕澹撴檪,杓稿叆姣旇純鍣ㄨ几鍑洪珮闆诲钩,浣縍-S瑙哥櫦(f膩)鍣ㄧ疆浣�,Q杓稿嚭楂橀浕骞�,杓稿嚭椹�(q奴)鍕曠灏庨��,杓稿嚭绔痜o鐐洪倧杓綆闆诲钩,鍚屾檪,闆绘祦闁嬮棞(gu膩n)鎵撳悜鍙抽倞,闆绘祦婧� IR 灏嶉浕瀹笴L 鍏呴浕銆傛鏅傜敱浜庡京闆舵櫠楂旂鎴,闆绘簮 Vcc 涔熼�氶亷闆婚樆 Rt 灏嶉浕瀹� Ct 鍏呴浕銆傜暥闆诲 Ct 鍏╃鍏呴浕闆诲澶т簬 Vcc 鐨�2/3 鏅�,瀹氭檪姣旇純鍣ㄨ几鍑轰竴楂橀浕骞�, 浣� R-S 瑙哥櫦(f膩)鍣ㄥ京浣�,Q 杓稿嚭浣庨浕骞�,杓稿嚭椹�(q奴)鍕曠鎴,杓稿嚭绔� fo 鐐洪倧杓珮闆诲钩,鍚屾檪,寰╅浂鏅堕珨绠″皫閫�,闆诲 Ct 閫氶亷寰╅浂鏅堕珨绠¤繀閫熸斁闆�;闆绘祦闁嬮棞(gu膩n)鎵撳悜宸﹂倞,闆诲 CL 灏嶉浕闃� RL鏀鹃浕銆傜暥闆诲 CL 鏀鹃浕闆诲绛変簬杓稿叆闆诲 Vi 鏅�,杓稿叆姣旇純鍣ㄥ啀娆¤几鍑洪珮闆诲钩,浣� R-S瑙哥櫦(f膩)鍣ㄧ疆浣�,濡傛鍙嶅京寰挵(hu谩n),妲�(g貌u)鎴愯嚜婵�鎸暕銆� 鍙冲湒鐣嚭浜嗛浕瀹� Ct銆� CL 鍏呮斁闆诲拰杓稿嚭鑴堟矕 f0 鐨勬尝褰��傝ō(sh猫)闆诲 CL 鐨勫厖闆绘檪闁撶偤 t1,鏀鹃浕鏅傞枔鐐� t2,鍓囨牴鎿�(j霉)闆诲 CL 涓婇浕鑽峰钩琛＄殑鍘熺悊,鎴戝�戞湁:
銆�銆�(IR-VL/RL)t1=t2VL/RL
銆�銆�鍙冲湒鐐洪浕瀹瑰厖鏀鹃浕杓稿嚭娉㈠舰鍦栵細
銆�銆�寰炰笂寮忓彲寰�:
銆�銆�f0=1/(t1+t2)=VL/(RLIRt1)
銆�銆�瀵﹂殯涓�,瑭查浕璺殑VL 鍦ㄥ緢灏戠殑鑼冨湇鍏�(n猫i)(澶х磩10mV)娉㈠嫊,鍥犳, 鍙獚鐐篤L=Vi,鏁呬笂寮忓彲浠ヨ〃
銆�銆�绀虹偤:
銆�銆�f0==Vi/(RLIRt1)
銆�銆�鍙,杓稿嚭鑴堟矕闋荤巼 f0 鑸囪几鍏ラ浕澹� Vi鎴愭姣�,寰炶�屽鐝�(xi脿n)浜嗛浕澹�-闋荤巼璁婃彌銆傚紡涓� IR 鐢卞収(n猫i)閮�
銆�銆�鍩烘簴闆诲婧愪緵绲︾殑 1.90V 鍙冭�冮浕澹撳拰澶栨帴闆婚樆 Rs 姹哄畾,IR=1.90/Rs,鏀硅畩 Rs 鐨勫��,鍙(di脿o)绡�(ji茅)
銆�銆�闆昏矾鐨勮綁(zhu菐n)鎻涘鐩�,t1 鐢卞畾鏅傚厓浠� Rt 鍜� Ct 姹哄畾,鍏堕棞(gu膩n)绯绘槸锛歵1=1.1RtCt, 鍏稿瀷鍊�
銆�銆�Rt=6.8k惟,Ct=0.01µF,t1 =7.5µs銆傜敱 f0=Vi/(RLIRt)鍙煡,闆婚樆 Rs銆丷L銆丷t 鍜岄浕瀹� Ct 鐩�
銆�銆�鎺ュ奖闊胯綁(zhu菐n)鎻涚祼(ji茅)鏋� f0,鍥犳灏嶅厓浠剁殑绮惧害瑕佹湁涓�瀹氱殑瑕佹眰,鍙牴鎿�(j霉)杞�(zhu菐n)鎻涚簿搴﹂仼鐣堕伕鎿�銆傞浕瀹�
銆�銆�CL 灏嶈綁(zhu菐n)鎻涚祼(ji茅)鏋滈洊鐒舵矑鏈夌洿鎺ョ殑褰遍熆銆備絾鎳夐伕鎿囨紡闆绘祦灏忕殑闆诲鍣�銆傞浕闃� R1 鍜岄浕瀹� C1 绲�
銆�銆�鎴愪綆閫氭烤娉㈠櫒, 鍙笡灏戣几鍏ラ浕澹撲腑鐨勫共鎿捐剤娌�, 鏈夊埄浜庢彁楂樿綁(zhu菐n)鎻涚簿搴�銆�
銆�銆�鍙冲湒鐢卞叐濉奓M331绲勬垚鐨勯仚娓浕璺�銆傚湪浜哄摗涓嶈兘閫插叆鎴栦笉鏄撻�插叆鐨勫牬鍚堬紝閫氶亷鍌虫劅鍣ㄥ皣琚脯閲忚綁(zhu菐n)鎻涚偤闆�
銆�銆�澹�锛岀稉(j墨ng)閬嬬畻鏀惧ぇ鍣ㄦ斁澶х偤0锝�10V闆诲淇¤櫉锛岀敱LM331 閫茶V/F璁婃彌鐐鸿剤娌栦俊铏�锛岄�氶亷闀烽洐绲炵窔鍌宠几?sh霉)缍攜閲忓锛屽湪娓噺瀹ゅ収(n猫i)閫氶亷鍏夐浕鑰﹀悎鍣ㄨ綁(zhu菐n)鎻涚偤骞� 閲忓鑰岄�犳垚鐨勭窔璺“娓涙垨骞叉摼锛屾彁楂樻脯閲忕簿搴�銆�
銆�銆�鐣跺墠锛�12 浣嶄互涓婄殑A/D杞�(zhu菐n)鎻涘櫒鐨勫児鏍间粛杓冩槀璨�锛岀敤V/F璁婃彌鍣ㄤ締浠ｆ浛A/D杞�(zhu菐n)鎻涘櫒锛屽湪瑕佹眰閫熷害涓嶅お楂樼殑鍫村悎鏄竴绋純濂界殑閬告搰銆傜敤LM331 妲�(g貌u)鎴愮殑A/D璁婃彌鍣ㄩ噰闆嗙郴绲�(t菕ng)鎺ュ彛闆昏矾濡傚湒6 鎵�绀�銆� 寰炲偝鎰熷櫒渚嗙殑姣紡绱氱殑闆诲淇¤櫉缍�(j墨ng)浣庢韩婕傞亱绠楁斁澶у櫒INA101 鏀惧ぇ鍒�0锝�10V鍚庡姞鍒癡/F璁婃彌鍣↙M331鐨勮几鍏ョ锛屽緸闋荤巼杓稿嚭绔痜0杓稿嚭鐨勯牷鐜囦俊铏熷姞鍒板柈鐗囨 8031 鐨勮几鍏ョT1涓娿�傛牴鎿�(j霉)鍒嗚鲸鐜囩殑瑕佹眰鍒╃敤杌熶欢(闄愪簬绡囧箙锛岀▼搴忛儴鍒嗙暐)铏曠悊锛屽緱鍒癆/D杞�(zhu菐n)鎻涚殑绲�(ji茅)鏋溿��
缍韩闆诲瓙閫�锛岄浕瀛愮煡璀橈紝涓�鏌ョ櫨閫�锛�
宸叉敹閷勮姊�160813鍊�
