Honeywell CC-PAIH01*CC-PAOH01
Honeywell 51405038-175*51405039-175
CONVSTA／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。
Powerboard AEG Frequenzumricht?er T56030155045
382EA21V1F Moore 382 Logic and Sequence Controller
382EA21V1N Moore 382 Logic and Sequence Controller
382EA21VNF Moore 382 Logic and Sequence Controller
383BA21N1F Moore 383 Multi-Point Display Station
383BA21NNF Moore 383 Multi-Point Display Station
383RA21N1F Moore 383 Multi-Point Display Station
383RA21NNF Moore 383 Multi-Point Display Station
383TA21N1F Moore 383 Multi-Point Display Station
383TA21N1N Moore 383 Multi-Point Display Station
383TA21NNF Moore 383 Multi-Point Display Station
383VA21N1F Moore 383 Multi-Point Display Station
383VA21N1N Moore 383 Multi-Point Display Station
383VA21NNF Moore 383 Multi-Point Display Station
385HA21NNAN Moore 385 Loop Operator's Station
353A4F1NNNNNNA4 Moore 353 Process Automation Controller
353A4F1NNNNNNAN Moore 353 Process Automation Controller
353A4FNCNB4 TGX:353A4FNCNB4 Moore 353 Process Automation Controller
353A4NNNNTNNA4 Moore 353 Process Automation Controller
353D2F1LNLNNNA4 Moore 353 Process Automation Controller
353D2F1NNLNNNA4 Moore 353 Process Automation Controller
353D2F1NNNNNNA4 Moore 353 Process Automation Controller
353D2FNNNLNNNA4 Moore 353 Process Automation Controller
353D2FNNNNNNNA4 Moore 353 Process Automation Controller
354N1D1LNLNNNAJ Moore 354
362A2F Recorder
363A11N1NN1AN Moore 363 Multi-Point Digital Recorder
363A21N1NNNAN Moore 363 Multi-Point Digital Recorder
363A21N4NN1AN Moore 363 Multi-Point Digital Recorder
363A21N4NN1B4 Moore 363 Multi-Point Digital Recorder
363A21N4NNNA4 Moore 363 Multi-Point Digital Recorder
363A21N4UD1B4 Moore 363 Multi-Point Digital Recorder
363A21N4UN1B4 Moore 363 Multi-Point Digital Recorder
372A11NF Moore 372 Indicator Station
372A21NF Moore 372 Indicator Station
372A21NN Moore 372 Indicator Station
382BA21VNF Moore 382 Logic and Sequence Controller
382EA21D1F Moore 382 Logic and Sequence Controller
382EA21F1F Moore 382 Logic and Sequence Controller
382EA21F1N Moore 382 Logic and Sequence Controller
382EA21FNF Moore 382 Logic and Sequence Controller
382EA21FNN Moore 382 Logic and Sequence Controller
382EA21N1F Moore 382 Logic and Sequence Controller
382EA21N1N Moore 382 Logic and Sequence Controller
382EA21NNF Moore 382 Logic and Sequence Controller
352EC21T1F Moore 352 Single-Loop Digital Controller
352EC21TNF Moore 352 Single-Loop Digital Controller
352EC21V1F Moore 352 Single-Loop Digital Controller
352EC21VNF Moore 352 Single-Loop Digital Controller
352PBA21A1NNNA4 Moore 352Plus Single-Loop Digital Controller
352PBA21A1TNNA4 Moore 352Plus Single-Loop Digital Controller
352PBA21ANNNNA4 Moore 352Plus Single-Loop Digital Controller
352PBA21ANTNNA4 Moore 352Plus Single-Loop Digital Controller
352PEA21C1NNNA4 Moore 352Plus Single-Loop Digital Controller
352PEA21CNNNNA4 Moore 352Plus Single-Loop Digital Controller
352PEA21D1NNNA4 Moore 352Plus Single-Loop Digital Controller
352PEA21DNNNNA4 Moore 352Plus Single-Loop Digital Controller
352PEA21F1NNNA4 Moore 352Plus Single-Loop Digital Controller
352PEA21FNNNNA4 Moore 352Plus Single-Loop Digital Controller
352PEA21T1NNNA4 Moore 352Plus Single-Loop Digital Controller
352PEA21T1TNNAN Moore 352Plus Single-Loop Digital Controller
352PEA21TNNNNA4 Moore 352Plus Single-Loop Digital Controller
352PEA21V1NNNA4 Moore 352Plus Single-Loop Digital Controller
352PEA21V1NNNAW Moore 352Plus Single-Loop Digital Controller
352PEA21VNNNNA4 Moore 352Plus Single-Loop Digital Controller
353A2F1NNLNNNA4 Moore 353 Process Automation Controller
353A2F1NNNNNNA4 Moore 353 Process Automation Controller
353A2FNLNNNNNA4 Moore 353 Process Automation Controller
353A2FNNNLNNNA4 Moore 353 Process Automation Controller
353A2FNNNNNNNA4 Moore 353 Process Automation Controller
353A2FNNNNNNNAW Moore 353 Process Automation Controller
353A4F1CNB4 TGX:353A4F1CNB4 Moore 353 Process Automation Controller
353A4F1NNENNNA4 Moore 353 Process Automation Controller
353A4F1NNETNNA4 Moore 353 Process Automation Controller
353A4F1NNLNNNA4 Moore 353 Process Automation Controller
352BC21VNF Moore 352 Single-Loop Digital Controller
352EA21C1C Moore 352 Single-Loop Digital Controller
352EA21CNC Moore 352 Single-Loop Digital Controller
352EA21CNF Moore 352 Single-Loop Digital Controller
352EA21D1F Moore 352 Single-Loop Digital Controller
352EA21DNF Moore 352 Single-Loop Digital Controller
352EA21F1F Moore 352 Single-Loop Digital Controller
352EA21FNF Moore 352 Single-Loop Digital Controller
352EA21H1F Moore 352 Single-Loop Digital Controller
352EA21HNF Moore 352 Single-Loop Digital Controller
352EA21M1F Moore 352 Single-loop Digital Controller
352EA21M1N Moore 352 Single-Loop Digital Controller
352EA21MNF Moore 352 Single-loop Digital Controller
352EA21N1C Moore 352 Single-Loop Digital Controller
352EA21N1F Moore 352 Single-Loop Digital Controller
352EA21N1N Moore 352 Single-Loop Digital Controller
352EA21NNF Moore 352 Single-Loop Digital Controller
352EA21NNN Moore 352 Single-Loop Digital Controller
352EA21T1F Moore 352 Single-Loop Digital Controller
352EA21TNF Moore 352 Single-Loop Digital Controller
352EA21V1F Moore 352 Single-Loop Digital Controller
352EA21V1N Moore 352 Single-Loop Digital Controller
352EA21VNF Moore 352 Single-Loop Digital Controller
352EA21VNN Moore 352 Single-Loop Digital Controller
352EC21D1F Moore 352 Single-Loop Digital Controller
352EC21DNF Moore 352 Single-Loop Digital Controller
352EC21F1F Moore 352 Single-Loop Digital Controller
352EC21FNF Moore 352 Single-Loop Digital Controller
352EC21N1F Moore 352 Single-Loop Digital Controller
352EC21NNF Moore 352 Single-Loop Digital Controller
16357-34 Realtime Clock/Configuration Backup Module
320A2NNF Model 320 Independent Computer Interface
348EA1NN1BNNH2N Moore 348 Moore 348 Field Mounted Controller
348EA1RN1BNNH14 Moore 348 Moore 348 Field Mounted Controller
348EA2NN1BNNH14 Moore 348,16161-242/4VJ, Moore 348 Field Mounted Controller
348ED2NN2BNNH14 Moore 348 Field Pac Module
351A21N1F Moore 351 Triple-Loop Digital Controller
351A21NNF Moore 351 Triple-Loop Digital Controller
351A21NNN Moore 351 Triple-Loop Digital Controller
351A21T1F Moore 351 Triple-Loop Digital Controller
351A21V1F Moore 351 Triple-Loop Digital Controller
351A21VNF Moore 351 Triple-Loop Digital Controller
352BA11N1F Moore 352 Single-Loop Digital Controller
352BA11NNC Moore 352 Single-Loop Digital Controller*******************************************
352BA11NNF Moore 352 Single-Loop Digital Controller
352BA11V1F Moore 352 Single-Loop Digital Controller
352BA11VNF Moore 352 Single-Loop Digital Controller
352BA1NNNF Moore 352 Single-Loop Digital Controller
352BA21N1F Moore 352 Single-Loop Digital Controller
352BA21NNF Moore 352 Single-Loop Digital Controller
352BA21V1F Moore 352 Single-Loop Digital Controller
352BA21VNF Moore 352 Single-Loop Digital Controller
352BC11N1F Moore 352 Single-Loop Digital Controller
352BC11NNF Moore 352 Single-Loop Digital Controller
352BC11NNN Moore 352 Single-Loop Digital Controller
352BC11V1F Moore 352 Single-Loop Digital Controller
352BC11VNF Moore 352 Single-Loop Digital Controller
352BC21N1F Moore 352 Single-Loop Digital Controller
352BC21NNF Moore 352 Single-Loop Digital Controller
352BC21V1F Moore 352 Single-Loop Digital Controller
15950-11 15950-11 BBB Frequency Input
15950-21 15950-21 BBB Frequency Input
15950-23 15950-11 Frequency Input Module Kit - Moore 352
15954-1 15954-1 BBC 382 Expansion Board
16005-1 16005-1 Hi Common Mode Thermocouple and Milivolt Input
16040-6 Moore 383 Display Assembly
16042-11 RTD Module for Moore 383
16052-15/4 Moore 352 Module Rack
16100-28 Moore 351 Display Assembly
16105-16 16105-16 BCA Smart Transmitter Board
16105-18 Moore 352 Controller Board Software Update Kit
16105-19 Moore 352 Display Assembly
16105-26 Moore 352 Expansion Board Software Update Kit
16105-36 16105-36 BCA,BCB, BCC 352 Expansion Board
16105-92 Expander Baord Kit 352
16105-93 16105-93 BCA Smart Transmitter Board
16276-131-2 Moore 353 MPU Controller Board
16297-21 16297-21-2 Local Interface Link Module
16297-22 Local Instrument Link Board Kit
16298-41 16298-41-2 Lonworks Protocol Board
16298-51 16298-51-1 Lonworks Protocol Board
16305-41-2 16305-41 Moore 353 I/O Expander Board
16342-1 16342-1-0B Moore Module
16353-52 16305-41-2 Moore 353 I/O Expander Board Kit
16353-53 Moore 353 Display Assembly
16356-23 Mounting Case, 40 Terminals
16356-27 MPU Board Kit 120/240 Vac
16356-28 MPU Board Kit 24 Vdc
16356-29 I/O Expander Board
16356-44 I/O Expander Board
14755-123 Power Supply
14755-133 Power Supply
14755-27 Power Supply
14755-88 Power Supply
15060-S11HL Moore 375C Moore 375C Vertigage
15060-S9GG Moore 375C Moore Model 375C Vertigage
15738-119 Moore Mounting Case With 40 Terminals
15738-120 Moore Mounting Case With 20 Terminals
15738-71 Moore 352 Display Assembly
15768-101 15768-101 BBB Computer Pulse Input
15768-112 15768-112 BBB Computer Pulse Input
15768-113R 15768-113 BBB Computer Pulse Input
15770-202 15770-202 BBB 352 Expansion Board
15770-217 15770-217 BBB 352 Expansion Board
15770-220 15770-220 BBA 351 Expansion Board
15819-107 15819-107 BBF Thermocouple and Millivolt Input
15819-131 15819-131 BBG, BBF, BBD Thermocouple and Millivolt Input
15824-101 15824-101 BBC Voltage Input
15824-112 15824-112 BBC Voltage Input
15824-113 15824-113 BBC Voltage Input
15853-1 15853-1 BBA Local Interface Link Module
15853-12 15853-12 BBB Local Interface Link Module
15853-31 15853-31 BBB Local Interface Link Module
15899-1 15899-1-7 Serial Port Board
15936-1 Cable Adapter Board
15936-11 Cable Adapter Board
15942-15 Moore 382 Display Assembly
15945-1 15945-1 BBF RTD Input
15945-31 15945-31 BBF RTD Input
15950-1 15950-1 BBB Frequency Input