www.instrument.com - Tuesday, January 6, 2009
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(URL: http://www.edasce.com/analog-multiplexer.html)
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Analog input expansion module
The PCI-20031M-1 Analog Expander/Sequencer Module adds up to 32 additional analog input channels to any expandable Intelligent Instrumentation board. The PCI-20031M-1 is compatible with the PCI-20002M-1, PCI-20023M-1, PCI-20341M-1A and PCI-20364M-1 modules, as well as the analog inputs on the PCI-20098C Series and PCI-20501C Series multifunction boards. Electrical connections between the output of the expander and the input to the analog input device (option module or analog input section of the board) is provided by the internal I3 Bus.
The PCI-20031M-1 supports both single-ended or differential inputs, depending upon the configuration of the analog input device with which it is connected.
When used in the differential mode, 16 channels are supported. The total number of channels depends upon the analog input device it drives and the scan mode selected. In most cases, the PCI-20031M-1 channels are added to the original channels of the input device. However, in the hardware scan mode associated with the PCI-20023M-1 option modules, the channels on the A/D module cannot be counted. Multiple PCI-20031M-1 modules can be cascaded to further expand input capability.
Scan List Advance - A hardware channel scanner enhances high-speed performance by automatically advancing through the scan list. This can be accomplished via a software, internal hardware, or external hardware signal (for example, each time an A/D conversion is initiated). This allows scanning to be accomplished without intervention from the host computer. The scan list can store up to 128 elements. The channel sequence specified in the scan list can be in any order desired and can include duplicate channels. Duplicate channels are extremely useful in cases where a channel must be sampled at a higher frequency than others.
• Low-Cost 32/16 Analog Input Expansion |
• 128-Element Random Channel Scan List |
• Hardware Scan List Advance |
Parameter |
Conditions |
Specifications |
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Analog Inputs |
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Number of Channels |
Single-ended |
32 |
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Differential |
16 |
Analog Signal Range |
Linear Operation |
±10V |
Hardware Channel Scanner |
Advanced with sync input or software command |
Up to 128 Channels |
Overvoltage Protection |
Power on |
±35V |
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Power off |
±20V |
Input Capacitance* |
Channel "on": Single-ended |
100pF |
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Channel "on": Differential |
50pF |
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Channel "off" |
5pF |
"On" Resistance |
Maximum |
1.8K ohms |
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"Off" Isolation |
Frequency = 1kHz, RS = 1K ohms |
Input Leakage |
"On" Channel |
0.1nA |
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"Off" Channel |
0.03nA |
System Throughput** |
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Multichannel Analog Input with DMA |
Installed in module position 2 on PCI-20098C-2 |
100kHz |
Physical Characteristics |
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Power Requirements*** |
+5V |
345mA |
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+15V |
8mA |
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-15V |
4mA |
Operating Temperature Range |
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0 to 70° C |
* For a single PCI-20031M-1 Module only. To determine the total input capacitance of a system, add the input capacitance(s) of the PCI-20031M-1 module(s) to the input impedance of the system A/D. In the single-ended mode, it is assumed that all four mux outputs are connected together. In the differential mode, two mux outputs are connected together. |
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** Hardware limit only. Software may reduce speed. |
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*** Refer to the data sheet of the host board to determine available power. |
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