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Analog Input Channels:

Differential Channels?

Sampling Frequency:

Resolution:

bits

Bandwidth:

Accuracy:

% FS

Isolation:

Analog-to-Digital Conversion Type:

DC Voltage Input?

DC Current Input?

AC Voltage Input?

AC Current Input?

Form Factor:

Computer Bus:

Help with Analog-to-Digital Converters specifications:

Device Specifications
   Analog Input Channels:       This is the maximum number of analog channel inputs. The single-ended number is specified when single-ended inputs are available as twice the number of differential inputs. Differential channels use the difference between two signals as an input; common mode is filtered out. In some systems, differential inputs are combinations of two single-ended inputs. When this is the case, twice the numbers of differential channels are available as single-ended inputs. 
   Search Logic:      All matching products will have a value greater than or equal to the specified value.
   Differential Channels       Differential channels have two inputs. The signal to process is the voltage (V) difference between the two inputs. For example, if one reading is 4.93 V and the other reading is 5.16 V, the meaningful value is the 0.23 V difference between the two. Often, this applies to precision measurements where the difference between two low voltage inputs is small but critical. 
   Search Logic:      "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.
   Sampling Frequency       Sampling frequency is the frequency of analog signal sampling and conversion to a digital value. 
   Search Logic:      All matching products will have a value greater than or equal to the specified value.
   Resolution       Resolution refers to the degree of fineness of the digital word representing the analog value. A ten-bit number contains 210, or 1024, increments. A 0-10V signal could therefore be resolved into approximately 0.01V increments. A 12-bit representation would be in 212 (4096) increments, or divisions of 0.0024V for the same signal. Each additional bit doubles the resolution, and one bit is required for the polarity (sign) of a number. 
   Search Logic:      All matching products will have a value greater than or equal to the specified value.
   Bandwidth       Bandwidth is the difference between the high and low limits of the frequency response, typically defined by a variation from a nominal value by a stated value such as 3 dB. 
   Search Logic:      All matching products will have a value greater than or equal to the specified value.
   Accuracy       Accuracy depends on the signal conditioning linearity, hysteresis, temperature considerations, etc. It is represented here as percent full scale of measurement range. 
   Search Logic:      All matching products will have a value less than or equal to the specified value.
   Isolation       
   Your choices are...         
   Other       Other unlisted types of isolation. 
   Isolated Digital Input       The digital input voltage terminals are isolated. 
   Isolated Analog Voltage Input       The input voltage terminals are isolated. 
   Channel-to-Channel Isolation       The module channels are isolated from each other. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Analog-to-Digital Conversion Type
   Analog-to-Digital Conversion Type       
   Your choices are...         
   Flash       Flash ADCs apply the input in parallel to many fast comparators whose thresholds are equally spaced throughout the desired input voltage range, typically 1V. At any moment, all the comparators that have thresholds below the input voltage are on, and the rest are off. A series of latching AND gates connect between adjacent comparators so that only the gate at the boundary between the on and off comparators is active. The input clock latches the AND gate outputs, and a pipelined circuit converts this one-out-of-N input to a binary output. Flash ADCs need 2N comparators to generate an N-bit output, and thus they tend to have no more than 6 to 10 output bits. Because the input has to drive all the comparators in parallel, the input capacitance is a major limitation to the bandwidth. The sampling bit synchronizer can often use this input capacitance as one element of the noise filter. 
   Half-flash       Half-flash ADCs determine their output code by digitally combining the results of two sequentially-performed, lower-resolution flash conversions. 
   Integrator       Integrators are ADCs whose output code represents the average value of the input voltage over a given time interval. 
   Delta Sigma (Modulator)       Delta sigma (modulator) is a high-accuracy circuit that samples at a higher rate and lower resolution than is needed and (by means of feedback loops) pushes the quantization noise above the frequency range of interest. This out-of-band noise is typically removed by digital filters. 
   Successive Approximation       Successive approximation ADCs sequentially compare a series of binary-weighted values with an analog input to produce an output digital word in n steps, where n is the bit resolution of the ADC. 
   Voltage-to-Frequency       Voltage-to-frequency ADCs convert an input voltage to an output pulse train with a frequency proportional to the input voltage. Output frequency is determined by counting pulses over a fixed time interval and the voltage is inferred from the known relationship. Voltage-to-frequency conversion has a high degree of noise rejection, because the input signal is effectively integrated over the counting interval. Voltage-to-frequency conversion is commonly used to convert slow and often noisy signals. It is also useful for remote sensing applications in noisy environments. The input voltage is converted to a frequency at the remote location and the digital pulse train is transmitted over a pair of wires to the counter. This eliminates the noise that can be introduced in the transmission of an analog signal over a long distance. 
   Other       Other specialized or unlisted methods of analog-to-digital conversion. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Signal Inputs
   DC Voltage Input         
   Search Logic:      "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.
   DC Current Input?         
   Search Logic:      "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.
   AC Voltage Input?         
   Search Logic:      "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.
   AC Current Input?         
   Search Logic:      "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.
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Form Factor
   Form Factor       
   Your choices are...         
   Printed Circuit Board (PCB)       Devices are printed circuit boards (PCBs) that attach to enclosures or plug directly into computer backplanes. 
   Panel / Chassis Mount       Devices attach to a panel or bolt onto a chassis. 
   Modular Bay / Slot System       Devices stack in modular bays or slots and can be interfaced to other units. 
   Rack Mount       Devices are rack-mounted and fit inside enclosures such as a standard 19” telecommunications rack. 
   DIN Rail       Devices mount on a standard DIN rail. DIN is an acronym for Deutsches Institut für Normung (DIN), a German national organization for standardization. 
   Stand Alone       Devices are benchtop or floor-standing units with a full casing or cabinet and an integral interface. 
   Other       Other unlisted form factors. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Computer Bus
   Computer Bus       
   Your choices are...         
   MIX Bus       Modular interface extension (MIX) is a high-performance stacking and communications interface for connecting expansion modules to a VMEbus baseboard. The MIX bus supports 32-bit data transfers and DMA transfers. It also provides 4 GB of memory addressing capability. 
   Multibus (I & II)       Multibus is a modular computer-systems architecture used in embedded applications in telecommunications, medical-devices, manufacturing automation, networking, and other market areas. 
   PC/104 (PC/104-Plus, EBX)       PC/104 gets its name from the desktop personal computers designed by IBM (PCs), and from the number of pins used to connect the cards together (104). PC/104 cards are much smaller than ISA-bus cards and stack together eliminating the need for a motherboard, back plane, and/or card cage. PC/104-Plus incorporates the PCI bus into the PC/104 form-factor for faster data transfer. EBX (Embedded Board eXpandable) defines a 5.75" x 8" form factor large enough to implement a powerful single-board computer. It supports PC/104 expansion. 
   PCI       Peripheral component interconnect (PCI) is a local bus system designed for high-end computer systems. PCI buses transfer 32 or 64 bits of data at a clock speed of 33 MHz. They also support 3 to 5 critical peripherals, which are either integrated directly onto the motherboard or added via expansion cards. PCI buses fully support cards that were developed for standard I/O buses. 
   PCMCIA (PC Card)       PCMCIA devices (PC Cards) are credit-card-sized peripherals predominantly used in laptop computers. The PCMCIA adapter takes the place of a COM port on a standard bus. The card is plugged into a 68-pin host socket that is connected either to the motherboard or an expansion bus. An adapter then translates the PCMCIA signals into signals usable by the computer's bus. 
   PXI Bus       PCI extensions for instrumentation (PXI) is a superset of CompactPCI that adds timing and triggering functions, imposes requirements for documenting environmental tests, and establishes a standard Windows®-based software framework. Windows is a registered trademark of the Microsoft Corporation. 
   PMC Bus       PMC is a form factor, not a bus. It is electrically equivalent to the PCI bus, but has a different shape and bus connectors. PMC is designed for rugged applications and provides a secure mounting platform for VME mezzanine boards. 
   STD Bus       STD is often called the "blue collar bus" because of its rugged design and use in industrial and process control applications. There are three STD bus types: STD Z80, STD80, and STD 32. The STD Z80 bus and the STD 80 bus use a 56-pin backplane with 0.125" contact spacing for card interconnection. The STD 32 Bus provides a 32-bit wide data bus to support 8, 16, and 32-bit data transfers. Dynamic bus sizing, which varies the data path size depending on the requirements of the peripheral card being addressed, gives the STD 32 bus added flexibility. 
   IEEE 1394 (FireWire®)       IEEE 1394 or FireWire® is an interface standard adopted by the Institute of Electrical and Electronics Engineers (IEEE) for very fast digital data transfers such as streaming video. IEEE 1394 connectors are used to transmit and receive data among FireWire devices, and are designed to replace external high-speed peripheral connections to personal computers, including hard disks, CD-ROMs, DVDs, graphics cards, high-speed scanners, direct video, monitors, etc. Tiny, robust FireWire connectors will also become important parts of home entertainment, communication, and appliance networks. FireWire is a registered trademark of Apple Computer, Inc.  
   Industry Pack® Bus (IP)       IndustryPack® (IP) is a mezzanine bus that provides input / output (I/O) capabilities in general-purpose computer systems. IndustryPack is both a registered trademark of GreenSpring computers and a specification maintained by the VITA standards organization (VSO) of the American National Standards Institute (ANSI). IP modules are available in two sizes. Single-size modules are 1.8” x 3.9” (45.3 cm2). Double-size modules are 3.6” x 3.9” (90.6 cm2). 
   ISA / EISA       Industry standard architecture (ISA) buses can handle 16-bit data transfers at a clock speed of 8 MHz. They are also capable of handling memory under 16 MB. Extended ISA (EISA) is an enhanced version of the ISA bus. EISA buses run at 8 MHz, are capable of 32-bit data transfers, and can access all memory in the system. 
   CompactPCI       Compact PCI (cPCI) is a high-performance industrial bus that uses the electrical standards of the PCI bus and is packaged in a Eurocard. Specifications for the CompactPCI bus are developed and maintained by the PCI Industrial Computers Manufacturers Group (PICMG). cPCI buses are used extensively in systems that require high speed data transfers. Examples include data communication routers and switches, real-time machine control, real-time data acquisition, military systems, etc. 
   USB       Universal serial bus (USB) is a 4-wire, 12-Mbps serial bus for low-to-medium speed peripheral device connections to personal computers (PC), including keyboards, mice, modems, printers, joysticks, audio functions, monitor controls, etc. The USB design is standardized by the USB Implementers Forum (USBIF), an organization that includes leading companies from the computer and electronics industries. The current USB specification is USB 2.0, which supports data transfer rates of up to 480 Mbps. 
   VMEbus       VMEbus is based on the VME standard, which defines mechanical specifications such as board dimensions, connector specifications and enclosure characteristics, as well as the electronic specifications for sub-bus structures, signal functions, timing, signal voltage levels, and master/slave configurations.  The VMEbus uses 3U and 6U Eurocards, rugged circuit boards that provide a 96-pin plug instead of an edge connector for durability. Several VMEbus varieties are available.  
   VXI / MXI Bus       VME extensions for instrumentation (VXI) are electrical and mechanical standards used mainly with automatic test equipment (ATE). VXI allows equipment from different vendors to work together in a common control and packaging environment. Multisystem extension interface (MXI) is an 8MB/s bus for connection of up to 8 digital devices and expansion boards. 
   Other       Other unlisted, specialized, or proprietary configurations. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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