HoneywellCC-PAIH01*CC-PAOH01Honeywell51405038-175*51405039-175CONVSTA／B／C是转换使能逻辑输入，每对有其相关的CONVST信号，用来启动每对或每4个或6个ADC同步采样。CS是片选信号，逻辑低电平时使能。RD是读信号，逻辑低电平时使能。WR/PEFEN/DIS是写数据/参考使能/非使能。BUSY是忙信号输出，当转换开始时为高电平，并且在转换结束前一直为高电平。SER/PAR是串行/并行选择输入信号。低电平时选择并行接口模式，高电平时选择串行接口模式。DB[0]/SELA是数据0位／选择输出A路。DB[1]/SELB是数据1位/选择输出B路。DB[2]/SELC是数据2位/选择输出C路。DB[3]/DCINC是数据3位，C路为菊花链式。DB[4]DCINB是数据4位/B路为菊花链式。DB[5]/DCINA是数据5位/A路为菊花链式。DB[6]/SCLK是数据6位/串行时钟。DB[7]/HBEN/DCEN是数据7位/高位使能/菊花链式使能。DB[8]DOUTA是数据8位/串行数据输出A。DB[9]/DOUTB是数据9位/串行数据输出B。DB[10]/DOUTC是数据10位/串行数据输出C。DB[11]/DGND是数据11位/数字地。DB[12]、DB[13]、DB[15]是数据12位、数据13位、数据15位。DB[14]/REFBUFEN/DIS是数据14位/参考缓冲使能(低电平时)/非使能(高电平时)。RESET是复位信号输入。RANGE是模拟输入范围选择输入信号。VDO是正电源端。Vss是负电源端。H/SSEL是硬件/软件选择输入引脚。W/B是字或字节模式选择。3AD7656的工作原理及系统构成3.1AD7656的工作原理AD7656是逐次逼近型转换器，包括1个比较器、1个模／数转换器、1个逐次逼近寄存器(SAR)和1个逻辑控制单元。转换中的逐次逼近是按对分原理由控制逻辑电路完成。其大致过程如下：启动转换后，控制逻辑电路首先把逐次逼近寄存器的最高位置1，其他置0，逐次逼近寄存器的这个内容经过模/数转换后得到约为满量程输出一半的电压值。这个电压值在比较器中与输入信号进行比较。比较器的输出反馈到模／数转换器，并在下一次比较前对其进行修正。在逻辑控制电路的时钟驱动下，逐次逼近寄存器不断进行比较和移位操作，直到完成最低有效位(LSB)的转换。这时逐次逼近寄存器的各位值均已确定，逐次逼近转换完成。由于逐次逼近型模/数转换器在1个时钟周期内只能完成1位转换，N位转换需要N个时钟周期，故这种模/数转换器的采样速率不高，输入带宽也较小。它的优点是原理简单，便于实现，不存在延迟问题．适用于中速率和分辨率较高的应用场合。AD7656包含1个低噪声、宽带跟踪保持放大器来处理输入频率高达8MHz的信号，还具有高速并行和串行接口，从而允许该器件与微处理器(MPU)或数字信号处理器(DSP)连接。在串行接口方式下，AD7656能提供菊花链功能，把多个ADC连接到1个串行接口上。它可以接收双极性输入信号，RANGE引脚和RNG位为下次在±4xVREF-±2xVREF之间转换选择输入范围。当3个CONVST引脚连接到一起时，允许6个片上ADC同时采样，6个ADC可以被分成3对，每对有1个相关的CONVST信号，用来启动每对或每4个或是全部6个ADC同步采样，CONVSTA用来启动V1和V2的同步采样，CONVSTB对应的是V3和V4，CONVSTC对应的是V5和V6。跟踪保持放大器可以保证模／数转换器精确地转换满量程输入的正弦波信号，可以保证分辨率为16bit。跟踪保持放大器的输入带宽比工作在最大吞吐率情况下的ADC的奈奎斯特速率还要大。AD7656可以处理频率为8MHz的输入信号。跟踪保持放大器在CONVSTx的上升沿同步采样各自的输入信号。跟踪保持的典型时间为20ns，这可以使6个ADC同步采样。AD7656有2种工作模式：串行接口模式和高速的并行接口模式。本文主要介绍并行接口模式。并行接口模式以1个字的形式来操作(W／B=0)，也可采用字节的形式(W/B=1)。从并行总线上读数据时，信号SER／PAR应被置低电平。当CS和RD均为低电平时，数据线DBO-DB15将不再是高阻状态。CS信号可以被永久地置低电平，RD用来访问转换的结果。BUSY信号为低电平时开始读操作。AD7656有1个用来执行转换的片上振荡器，转换时间tCONVER为3μS。转换的开始是通过脉冲调制CONVSTx信号开始的，在CONVSTx的上升沿，被选中的ADC的跟踪保持电路会被置为保持模式，转换开始。在CONVSTx信号的上升沿后，BUSY信号会变化，这表示转换正在进行。转换时钟是由内部产生的，转换时间是从CONVSTx信号上升沿开始的3μS，BUSY信号会变为低电平，表示转换结束。在BUSY信号的下降沿，跟踪保持电路将回到跟踪模式。数据通过并行或串行接口从输出寄存器中被读出。图2示出AD7656并行接口字模式下的读操作数据流。如果只有8bit总线被使用，那么AD7656的接口将以字节模式(W／B=I)操作，这种操作下的转换结果将通过2次读操作来访问，每次读操作通过DB15-DB8来访问1个8bit的数据，如图3所示。其中，tCONV为转换时间3μS，内部时钟tQUIET为总线的废弃时间到下1个转换开始之间所必需的最小等待时间，最小值为400ns；t1为读操作时的最小时间20ns；t2为BUSY信号到RD信号之间的延迟时间(ns)；t3为CS到RD之间的建立时间(ns)；t4为CS到RD之间的保持时间(ns)；t5为RD的脉冲宽度，最小值为30ns；t6为RD下降沿后的数据访问时间，最大值为30ns；t7为RD上升沿之后的总线废弃时间，最小值为15ns，最大值为25ns。PowerboardAEGFrequenzumricht?erT56030155045382EA21V1FMoore382LogicandSequenceController382EA21V1NMoore382LogicandSequenceController382EA21VNFMoore382LogicandSequenceController383BA21N1FMoore383Multi-PointDisplayStation383BA21NNFMoore383Multi-PointDisplayStation383RA21N1FMoore383Multi-PointDisplayStation383RA21NNFMoore383Multi-PointDisplayStation383TA21N1FMoore383Multi-PointDisplayStation383TA21N1NMoore383Multi-PointDisplayStation383TA21NNFMoore383Multi-PointDisplayStation383VA21N1FMoore383Multi-PointDisplayStation383VA21N1NMoore383Multi-PointDisplayStation383VA21NNFMoore383Multi-PointDisplayStation385HA21NNANMoore385LoopOperator'sStation353A4F1NNNNNNA4Moore353ProcessAutomationController353A4F1NNNNNNANMoore353ProcessAutomationController353A4FNCNB4TGX:353A4FNCNB4Moore353ProcessAutomationController353A4NNNNTNNA4Moore353ProcessAutomationController353D2F1LNLNNNA4Moore353ProcessAutomationController353D2F1NNLNNNA4Moore353ProcessAutomationController353D2F1NNNNNNA4Moore353ProcessAutomationController353D2FNNNLNNNA4Moore353ProcessAutomationController353D2FNNNNNNNA4Moore353ProcessAutomationController354N1D1LNLNNNAJMoore354362A2FRecorder363A11N1NN1ANMoore363Multi-PointDigitalRecorder363A21N1NNNANMoore363Multi-PointDigitalRecorder363A21N4NN1ANMoore363Multi-PointDigitalRecorder363A21N4NN1B4Moore363Multi-PointDigitalRecorder363A21N4NNNA4Moore363Multi-PointDigitalRecorder363A21N4UD1B4Moore363Multi-PointDigitalRecorder363A21N4UN1B4Moore363Multi-PointDigitalRecorder372A11NFMoore372IndicatorStation372A21NFMoore372IndicatorStation372A21NNMoore372IndicatorStation382BA21VNFMoore382LogicandSequenceController382EA21D1FMoore382LogicandSequenceController382EA21F1FMoore382LogicandSequenceController382EA21F1NMoore382LogicandSequenceController382EA21FNFMoore382LogicandSequenceController382EA21FNNMoore382LogicandSequenceController382EA21N1FMoore382LogicandSequenceController382EA21N1NMoore382LogicandSequenceController382EA21NNFMoore382LogicandSequenceController352EC21T1FMoore352Single-LoopDigitalController352EC21TNFMoore352Single-LoopDigitalController352EC21V1FMoore352Single-LoopDigitalController352EC21VNFMoore352Single-LoopDigitalController352PBA21A1NNNA4Moore352PlusSingle-LoopDigitalController352PBA21A1TNNA4Moore352PlusSingle-LoopDigitalController352PBA21ANNNNA4Moore352PlusSingle-LoopDigitalController352PBA21ANTNNA4Moore352PlusSingle-LoopDigitalController352PEA21C1NNNA4Moore352PlusSingle-LoopDigitalController352PEA21CNNNNA4Moore352PlusSingle-LoopDigitalController352PEA21D1NNNA4Moore352PlusSingle-LoopDigitalController352PEA21DNNNNA4Moore352PlusSingle-LoopDigitalController352PEA21F1NNNA4Moore352PlusSingle-LoopDigitalController352PEA21FNNNNA4Moore352PlusSingle-LoopDigitalController352PEA21T1NNNA4Moore352PlusSingle-LoopDigitalController352PEA21T1TNNANMoore352PlusSingle-LoopDigitalController352PEA21TNNNNA4Moore352PlusSingle-LoopDigitalController352PEA21V1NNNA4Moore352PlusSingle-LoopDigitalController352PEA21V1NNNAWMoore352PlusSingle-LoopDigitalController352PEA21VNNNNA4Moore352PlusSingle-LoopDigitalController353A2F1NNLNNNA4Moore353ProcessAutomationController353A2F1NNNNNNA4Moore353ProcessAutomationController353A2FNLNNNNNA4Moore353ProcessAutomationController353A2FNNNLNNNA4Moore353ProcessAutomationController353A2FNNNNNNNA4Moore353ProcessAutomationController353A2FNNNNNNNAWMoore353ProcessAutomationController353A4F1CNB4TGX:353A4F1CNB4Moore353ProcessAutomationController353A4F1NNENNNA4Moore353ProcessAutomationController353A4F1NNETNNA4Moore353ProcessAutomationController353A4F1NNLNNNA4Moore353ProcessAutomationController352BC21VNFMoore352Single-LoopDigitalController352EA21C1CMoore352Single-LoopDigitalController352EA21CNCMoore352Single-LoopDigitalController352EA21CNFMoore352Single-LoopDigitalController352EA21D1FMoore352Single-LoopDigitalController352EA21DNFMoore352Single-LoopDigitalController352EA21F1FMoore352Single-LoopDigitalController352EA21FNFMoore352Single-LoopDigitalController352EA21H1FMoore352Single-LoopDigitalController352EA21HNFMoore352Single-LoopDigitalController352EA21M1FMoore352Single-loopDigitalController352EA21M1NMoore352Single-LoopDigitalController352EA21MNFMoore352Single-loopDigitalController352EA21N1CMoore352Single-LoopDigitalController352EA21N1FMoore352Single-LoopDigitalController352EA21N1NMoore352Single-LoopDigitalController352EA21NNFMoore352Single-LoopDigitalController352EA21NNNMoore352Single-LoopDigitalController352EA21T1FMoore352Single-LoopDigitalController352EA21TNFMoore352Single-LoopDigitalController352EA21V1FMoore352Single-LoopDigitalController352EA21V1NMoore352Single-LoopDigitalController352EA21VNFMoore352Single-LoopDigitalController352EA21VNNMoore352Single-LoopDigitalController352EC21D1FMoore352Single-LoopDigitalController352EC21DNFMoore352Single-LoopDigitalController352EC21F1FMoore352Single-LoopDigitalController352EC21FNFMoore352Single-LoopDigitalController352EC21N1FMoore352Single-LoopDigitalController352EC21NNFMoore352Single-LoopDigitalController16357-34RealtimeClock/ConfigurationBackupModule320A2NNFModel320IndependentComputerInterface348EA1NN1BNNH2NMoore348Moore348FieldMountedController348EA1RN1BNNH14Moore348Moore348FieldMountedController348EA2NN1BNNH14Moore348,16161-242/4VJ,Moore348FieldMountedController348ED2NN2BNNH14Moore348FieldPacModule351A21N1FMoore351Triple-LoopDigitalController351A21NNFMoore351Triple-LoopDigitalController351A21NNNMoore351Triple-LoopDigitalController351A21T1FMoore351Triple-LoopDigitalController351A21V1FMoore351Triple-LoopDigitalController351A21VNFMoore351Triple-LoopDigitalController352BA11N1FMoore352Single-LoopDigitalController352BA11NNCMoore352Single-LoopDigitalController*******************************************352BA11NNFMoore352Single-LoopDigitalController352BA11V1FMoore352Single-LoopDigitalController352BA11VNFMoore352Single-LoopDigitalController352BA1NNNFMoore352Single-LoopDigitalController352BA21N1FMoore352Single-LoopDigitalController352BA21NNFMoore352Single-LoopDigitalController352BA21V1FMoore352Single-LoopDigitalController352BA21VNFMoore352Single-LoopDigitalController352BC11N1FMoore352Single-LoopDigitalController352BC11NNFMoore352Single-LoopDigitalController352BC11NNNMoore352Single-LoopDigitalController352BC11V1FMoore352Single-LoopDigitalController352BC11VNFMoore352Single-LoopDigitalController352BC21N1FMoore352Single-LoopDigitalController352BC21NNFMoore352Single-LoopDigitalController352BC21V1FMoore352Single-LoopDigitalController15950-1115950-11BBBFrequencyInput15950-2115950-21BBBFrequencyInput15950-2315950-11FrequencyInputModuleKit-Moore35215954-115954-1BBC382ExpansionBoard16005-116005-1HiCommonModeThermocoupleandMilivoltInput16040-6Moore383DisplayAssembly16042-11RTDModuleforMoore38316052-15/4Moore352ModuleRack16100-28Moore351DisplayAssembly16105-1616105-16BCASmartTransmitterBoard16105-18Moore352ControllerBoardSoftwareUpdateKit16105-19Moore352DisplayAssembly16105-26Moore352ExpansionBoardSoftwareUpdateKit16105-3616105-36BCA,BCB,BCC352ExpansionBoard16105-92ExpanderBaordKit35216105-9316105-93BCASmartTransmitterBoard16276-131-2Moore353MPUControllerBoard16297-2116297-21-2LocalInterfaceLinkModule16297-22LocalInstrumentLinkBoardKit16298-4116298-41-2LonworksProtocolBoard16298-5116298-51-1LonworksProtocolBoard16305-41-216305-41Moore353I/OExpanderBoard16342-116342-1-0BMooreModule16353-5216305-41-2Moore353I/OExpanderBoardKit16353-53Moore353DisplayAssembly16356-23MountingCase,40Terminals16356-27MPUBoardKit120/240Vac16356-28MPUBoardKit24Vdc16356-29I/OExpanderBoard16356-44I/OExpanderBoard14755-123PowerSupply14755-133PowerSupply14755-27PowerSupply14755-88PowerSupply15060-S11HLMoore375CMoore375CVertigage15060-S9GGMoore375C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