【经验】使用两个32抽头DCP实现与1024个抽头的DCP相似的性能
数字控制电位器(DCPS)可用于各种系统,用于设置偏置电流,可变参考电压和校准。在工业控制和自动化应用中,必须保证高精度控制。1024个抽头的DCP的价格昂贵、双通道,32抽头,50kΩDCP价格较为便宜。那么问题来了,我们可以使用两个DCP达到与1024个抽头的DCP相似的性能吗?Intersil(已被瑞萨收购)使用ISL28194,进行巧妙的设计,实现了这一目标!
使用双32抽头的DCP,第一种方案是简单地将一个堆叠在另一个上面。这样做仅仅可以使有效分辨率加倍,但是其他DCP无法再进行连接,通常的做法是在较小的电压范围内堆叠DCP以提高其分辨率,但这不是最佳解决方案。
两个DCP同时使用时分辨率并不是2,而是可以将分辨率提高322或1024。两个DCP都将在地和电源之间进行拉伸处理。一个进行粗调,另一个进行微调。换句话说,一个提供高有效5位,另一个提供低有效5位。该电路的关键元件是求和电路中的加权电阻。
如图1所示,电阻器RFINE需要是RCOARSE值的32倍(在32抽头电位器示例中)。对于各种DCP抽头值,电阻需要按比例缩放,使得RFINE = RCOARSE×(抽头数)。
图1 双32-TAP DCP可以执行粗略和精细调整。还提供了1024-TAP DCP的低成本解决方案
求和运算放大器的反馈电阻值为953Ω(电阻值为1%) 这是1kΩ和32kΩ并联连接最接近的近似值。
分辨率与抽头数并不是呈平方关系,上述DCP有1024个抽头,而理论上粗略和精细调整模式下应该有1,048,576个抽头的分辨率。在5V电源下,LSB等于4.7μV,如果我们需要绝对精确数据,偏移电压是一个较为重要的参数。对于ISL28194,因为它是精密运算放大器,其典型偏移电压为0.1mV(或100μV),这将限制我们进行精确控制。如果选择更典型的放大器,则偏移电压可以在5mV至25mV的范围内变化。由于运算放大器具有5mV偏移,因此市售的最大抽头数为1024。
需要注意的是,输出将是两个输入之和的反转。图2是输出电压的数据。理论上所有1024个抽头会出现线性响应,虽然电路在电压频谱的末端表现出一些非线性,但在100-900个抽头范围内呈线性变化趋势。这800个分接头,可转换为9.6bit-双32脚DCP的输出!它绝对可以与更昂贵的1024抽头,10bit的DCP解决方案相媲美。
图2 输出电压与抽头数的关系图
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本文由karl翻译自Renesas,版权归世强硬创平台所有,非经授权,任何媒体、网站或个人不得转载,授权转载时须注明“来源:世强硬创平台”。
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型号- ISL12008,X9268,ISL21080,ISL28433,ISL28158,ISL2800X-100,ISL1221,ISL28417B,ISL1220,ISL28430,ISL3333E,ISL12082,ISL95311,ISL95310,ISL21007,ISL23428,ISL23425,X9258,X9259,ISL32704E,ISL28025,ISL28022,ISL28023,ISL12022M,ISL3332E,ISL23415,ISL22326,ISL23418,X9252,ISL3335XE,X9250,X9251,ISL28130,ISL28413,ISL28414,X9408,ISL2800X-50,ISL28258,ISL28134,ISL233X5,ISL28133,ISL94202,ISL32741E,ISL3331E,ISL22317,ISL22316,ISL81387E,ISL2800X,X9C503,ISL94208,ISL33337E,X9C102,ISL94203,X9C103,ISL95810,X9C104,X9111,X9118,X9511,X9116,ISL28127,ISL28006,X9119,ISL28005,ISL28117B,ISL94212,ISL12020M,ISL23511,ISL28408,ISL81334E,ISL28407,ISL3330E,ISL22424,ISL33354E,X9110,ISL28230,ISL28194,ISL22346WM,ISL12026A,ISL28190,ISL28191,ISL28114,ISL28233,ISL60002,ISL28113,ISL21440,ISL234X5,ISL28110,ISL23345,ISL90462,SL22326,ISL90461,ISL28118,ISL41387E,ISL23348,ISL3333XE,ISL12058,X95840,ISL22316WM,ISL2800X-20,ISL28227,ISL32740E,ISL41334E,ISL28107,ISL28108,ISL12057,ISL12027A,ISL22326WM,ISL1209,ISL28291,ISL1208,ISL12025,ISL12028,ISL28290,ISL28X9X,ISL28X30,ISL28213,ISL28214,ISL28217B,ISL28210,ISL28177,ISL23325,ISL23445,ISL23328,ISL28X34,ISL23448,ISL28X33,ISL28218,X60003,ISL12022,X9C303,ISL90842,ISL90841,ISL12024,ISL33357E,ISL90728,ISL21090,ISL1219,X9315,X95820,ISL1218,ISL90727,X9314,ISL90726,X9319,X9317,ISL45041,X9318,ISL45042,ISL21010,ISL22346,ISL22102,ISL28208,ISL23318,ISL28207,ISL23315,ISL33334E
End Of Life Notice (PLC22013)
型号- ISL28194FRUZ-T7,EL5171ISZ,ISL28194EVAL1Z,ISL28407FBZ,ISL28407FBZ-T13,EL5164ISZ-T7,EL5174ISZ-T7,EL5175IYZ-T7,EL5162ISZ-T13,ISL1557AIRZ-T7,ISL28408FBZ-T13,EL5164ISZ-T13,ISL28290FUZ,EL5177IYZ,ISL59110IEZ-T7,ISL28345FBZ-T7A,EL5165IWZ-T7,ISL28345FBZ-T13,ISL1557AIRZ,EL5162ISZ-T7A,EL5162ISZ,ISL22424WFR16Z,ISL22424WFR16Z-TK,EL5203IYZ-T7,ISL59830IAZ,ISL22424WFV14Z-TK,X5043PIZ-2.7,ISL28407FBZ-T7,ISL28345FBZ-T7,EL5203IYZ,ISL28417FVBZ-T7,EL5177IYZ-T13,ISL28407FBZ-T7A,ISL28290FBZ-T7,ISL28417FVBZ-T13,EL5175IYZ,TW2828-BA2-CR,X5043PIZ,EL5174ISZ,ISL28408FBZ-T7,EL8302ISZ-T13,EL5171ISZ-T7,X5043PZ,ISL22424WFV14Z,EL5164IWZ-T7,ISL28345FBZ,ISL28417FBBZ,EL5364ISZ,EL5364IUZ-T13,ISL28417FBZ-T7A,EL5203ISZ,EL5364ISZ-T7,EL5163IWZ-T7,ISL28417FBBZ-T7,ISL28194FHZ-T7A,ISL28194FHZ-T7,ISL28417FVBZ-T7A,EL5175ISZ,EL5203ISZ-T7,ISL28408FBZ,ISL59830IAZ-T13,ISL59830IAZ-T7,EL8101IWZ-TK,ISL1220IUZ-T,ISL59110IEZ-T7R5235,ISL95810WIU8Z,EL5175ISZ-T7,HAA9Q-53091ZR5141-T,ISL28290EVAL1Z,EL5165IWZ-T7A,EL5171ISZ-T7A,EL8302ISZ-T7,ISL95810WIU8Z-T,EL5163IWZ-T7A,EL8101IWZ-T7,ISL28417FBBZ-T13,EL5364ISZ-T13,EL5174ISZ-T13,EL5175ISZ-T13,ISL1221IUZ-T,ISL28408FBZ-T7A,EL5177IYZ-T7,HAA9Q-53091ZR5141,EL5175IYZ-T13,EL5364IUZ,EL5162ISZ-T7,ISL28417FBZ-T7,ISL28290FUZ-T7,ISL28417FBZ-T13,X5043PIZ-2.7A,ISL95810WIRT8Z-T,ISL28290FRUZ-T7,ISL28417FBBZ-T7A,EL8101IWZ-T7A,ISL28290FBZ,EL5164ISZ,EL5364IUZ-T7,EL5164IWZ-T7A,ISL95810WIRT8Z
ISL28194 Ultra-Small, 330nA and 1μA Single Supply, Rail-to-Rail Input/Output (RRIO) Op Amps DATASHEET
型号- ISL28194FRUZ-T7,ISL28194,ISL28194EVAL1Z,ISL28194FHZ-T7
ISL28194 Ultra-Small, 330nA and 1μA Single Supply, Rail-to-Rail Input/Output (RRIO) Op Amps
型号- ISL28194FRUZ-T7,ISL28194,ISL28194EVAL1Z,ISL28194FHZ-T7
ISL28194 Ultra-Small,330nA and 1uA Single Supply,Rail-to-Rail Input/Output(RRIO)Op Amps
型号- ISL28194FRUZ-T7,ISL28194EVAL1Z,ISL28194,ISL28194FHZ-T7
Ultra-Small, 330nA and 1μA Single Supply, Rail-to-Rail Input/Output (RRIO) Op Amps ISL28194
型号- ISL28194FRUZ-T7,ISL28194,ISL28194EVAL1Z,ISL28194FHZ-T7
Wireless Strain Gauge Module for Remote Applications APPLICATION NOTE
型号- ISL28194,ISL28915,ISL60002,ISL21440
【产品】超低功耗输入/输出轨对轨运算放大器
Intersil公司的运算放大器ISL28194,具有小尺寸、低功耗、单电源和轨到轨操作等优点,非常适合于所有电池供电的应用。
新产品 发布时间 : 2017-09-21
Application Note 1352 ISL28194EVAL1Z, ISL28195EVAL1Z Evaluation Board User’s Guide
型号- ISL28195FHZ-T7,ISL28194EVAL1Z,ISL28194,ISL28195,ISL28194FHZ-T7,ISL28195EVAL1Z
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提供是德(Keysight),罗德(R&S)测试测量仪器租赁服务,包括网络分析仪、无线通讯综测仪、信号发生器、频谱分析仪、信号分析仪、电源等仪器租赁服务;租赁费用按月计算,租赁价格按仪器配置而定。
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可定制板装式压力传感器支持产品量程从5inch水柱到100 psi气压;数字输出压力传感器压力范围0.5~60inH2O,温度补偿范围-20~85ºС;模拟和数字低压传感器可以直接与微控制器通信,具备多种小型SIP和DIP封装可选择。
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