：v+/i-=+0.5v/-0.8ma,v+/i-=-0.5v/-0.8ma。采用±5v电源供电。使
v+/i-=+0.5v/-0.8ma,v+/i-=-0.5v/-0.8ma cai yong 5v dian yuan gong dian shi
基准电源，电压为—2.8v±0.4v，温度系数80×106/℃。转换速率为3次/s,电源电压/电流为
ji zhun dian yuan dian ya wei 2.8v 0.4v wen du xi shu 80 106/ zhuan huan su lv wei 3 ci /s, dian yuan dian ya / dian liu wei
黄鳎苤苯忧惭羰牍埽畲蠹剖恰?计数范围内的准确度为±1个字。能自动调零保证在零输入时读数为0。提供内部
huang ta pie ben you can tang du sao she du pou qia ? ji shu fan wei nei de zhun que du wei 1 ge zi neng zi dong diao ling bao zheng zai ling shu ru shi du shu wei 0 ti gong nei bu
电源电流为9.8ma（均为典型值）。方案二：a/d转换器使用icl7107。icl7107是3轿皇ｗ
dian yuan dian liu wei 9.8ma jun wei dian xing zhi fang an er a/d zhuan huan qi shi yong icl7107 icl7107 shi 3 jiao huang
200khz，能以闪烁方式表示超量程状态。采用±5v电源供电。其中+5v电源电流为1.1ma，-5v
200khz neng yi shan shuo fang shi biao shi chao liang cheng zhuang tai cai yong 5v dian yuan gong dian qi zhong +5v dian yuan dian liu wei 1.1ma -5v
敝诱竦雌鳌⒒嫉缪乖春蚅ed显示器。所有输出电平与ttl电路兼容。时钟频率典型值为120khz，最大为
bi you song ci ao ji miu guai chun e ed xian shi qi suo you shu chu dian ping yu ttl dian lu jian rong shi zhong pin lv dian xing zhi wei 120khz zui da wei
转换，采用多路bcd码扫描输出，能降低led显示器的功耗。构成4轿值缪贡硎保枰獠拷佣我肼肫鳌⑽磺鳌⑹
zhuan huan cai yong duo lu bcd ma sao miao shu chu neng jiang di led xian shi qi de gong hao gou cheng 4 jiao zhi miu gong xing bao ping liao kao yong wo jing zhun ao huang ao
，允许差分输入。能自动判别08年护士考试报名表信号的极性，具有读数保护功能。具有超量程和欠量程信号输出，便于实现自动量程
yun hu cha fen shu ru neng zi dong pan bie 08 nian hu shi kao shi bao ming biao xin hao de ji xing ju you du shu bao hu gong neng ju you chao liang cheng he qian liang cheng xin hao shu chu bian yu shi xian zi dong liang cheng
，满量程为2.0000v，保证在零输入时读数为零。输入阻抗高于109ω，输入电流仅为1pa（典型值）
man liang cheng wei 2.0000v bao zheng zai ling shu ru shi du shu wei ling shu ru zu kang gao yu 109 shu ru dian liu jin wei 1pa dian xing zhi
/d转换器使用icl7135。icl7135是高精度08年护士考试报名表、通用型cmos单片4轿荒ｊ黄鳎畲蠹剖恰?999
/d zhuan huan qi shi yong icl7135 icl7135 shi gao jing du 08 nian hu shi kao shi bao ming biao tong yong xing cmos dan pian 4 jiao huang huang ta she du pou qia ?999
电压源，负电源提供可以使用稳压电源提供或者使用mc14069ubcp构成电路提供负电压源。方案一：a
dian ya yuan fu dian yuan ti gong ke yi shi yong wen ya dian yuan ti gong huo zhe shi yong mc14069ubcp gou cheng dian lu ti gong fu dian ya yuan fang an yi a
可设计4轿换?轿皇值缪贡碛盟中湍ｊ黄鳎桨缚裳∮肐cl7135或icl7107。要测量负电压则要提供负
ke she ji 4 jiao huan ? jiao huang zhi miu gong qi meng zhong tuan huang ta jiang fu shang qi cl7135 huo icl7107 yao ce liang fu dian ya ze yao ti gong fu
ed08年护士考试报名表数码管显示电压值6.显示位数：3位半三、方案比较由于题目要求，要用4位led显示，所以数模转换器
ed08 nian hu shi kao shi bao ming biao shu ma guan xian shi dian ya zhi 6. xian shi wei shu 3 wei ban san fang an bi jiao you yu ti mu yao qiu yao yong 4 wei led xian shi suo yi shu mo zhuan huan qi
采样速率：40khz3.测量范围：0.001v～1.999v4.测量精度：± 5%5.显示方式：用l
cai yang su lv 40khz3. ce liang fan wei 0.001v 1.999v4. ce liang jing du 5%5. xian shi fang shi yong l
，最大量程为1.999v，并可以扩展为多档量程。二、设计要求与08年护士考试报名表任务：1.工作电压：单电源5v直流2.
zui da liang cheng wei 1.999v bing ke yi kuo zhan wei duo dang liang cheng er she ji yao qiu yu 08 nian hu shi kao shi bao ming biao ren wu 1. gong zuo dian ya dan dian yuan 5v zhi liu 2.
录的时间，在读数过程中避免引入人为的测量误差（例如视差），不易造成视觉疲劳。本表可以测量正负输入电压
lu de shi jian zai du shu guo cheng zhong bi mian yin ru ren wei de ce liang wu cha li ru shi cha bu yi zao cheng shi jiao pi lao ben biao ke yi ce liang zheng fu shu ru dian ya
发生跳数现象，测量结果就是惟一的，不仅保证读数的客观性与准确性，还符合人们的读08年护士考试报名表数习惯，能缩短读数和记
fa sheng tiao shu xian xiang ce liang jie guo jiu shi wei yi de bu jin bao zheng du shu de ke guan xing yu zhun que xing hai fu he ren men de du 08 nian hu shi kao shi bao ming biao shu xi guan neng suo duan du shu he ji
示电路组成。数字电压表采用先进的数显技术，电路中使用4只led数码管，使测量结果一目了然，只要仪表不
shi dian lu zu cheng shu zi dian ya biao cai yong xian jin de shu xian ji shu dian lu zhong shi yong 4 zhi led shu ma guan shi ce liang jie guo yi mu le ran zhi yao yi biao bu
器、和基准电08年护士考试报名表源、并联稳压电路、备压整流、振荡电路、积分电路、负电压源提供电路、波形整形电路、数码管显
qi he ji zhun dian 08 nian hu shi kao shi bao ming biao yuan bing lian wen ya dian lu bei ya zheng liu zhen dang dian lu ji fen dian lu fu dian ya yuan ti gong dian lu bo xing zheng xing dian lu shu ma guan xian
标签：数字电压表 论文 一、设计内容摘要由icl7107构成的数字电压表需要有输入放大器、a/d转换
biao qian shu zi dian ya biao lun wen yi she ji nei rong zhai yao you icl7107 gou cheng de shu zi dian ya biao xu yao you shu ru fang da qi a/d zhuan huan