National Instruments 3.21E+04 Manual De Usuario

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 National Instruments Corporation

C-1

AT-MIO/AI E Series User Manual

This appendix contains a list of commonly asked questions and their 
answers relating to usage and special features of your AT E Series 
board.

The AT E Series boards are switchless and jumperless, enhanced 
MIO boards that use the DAQ-STC for timing.

The DAQ-STC is the new system timing control ASIC 
(application-specific integrated circuit) designed by National 
Instruments and is the backbone of the AT E Series boards.  The 
DAQ-STC contains seven 24-bit counters and three 16-bit 
counters.  The counters are divided into three groups:  

•

Analog input—two 24-bit, two 16-bit counters

•

Analog output—three 24-bit, one 16-bit counters

•

General-purpose counter/timer functions—two 24-bit counters

The groups can be configured independently with timing 
resolutions of 50 ns or 10 

µ

s.  With the DAQ-STC, you can 

interconnect a wide variety of internal timing signals to other 
internal blocks.  The interconnection scheme is quite flexible and 
completely software configurable. New capabilities such as 
buffered pulse generation, equivalent time sampling, and 
seamlessly changing the sampling rate are possible.

The last numeral in the name of an AT E Series board specifies the 
settling time in microseconds for that particular board.  For 
example, the AT-MIO-16E-2 has a 2 

µ

s settling time, which 

corresponds to a sampling rate of  500 kS/s.  These sampling rates 
are aggregate:  one channel at 500 kS/s or two channels at 
250 kS/s per channel illustrates the relationship. Notice, however,