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This example discusses the internal structure of a typical data acquisition system, such as might be used in process monitoring and control, instrumentation, and test applications The data acquisition system discussed in this example is the AT-MIO-16 from National Instruments The AT-MIO-16 is a high-performance, multifunction analog, digital, and timing input/output (I/O) board for the IBM PC/AT and compatibles It contains a 12-bit ADC with up to 16 analog inputs, two 12-bit DACs with voltage outputs, eight lines of transistor-transistor-logic (TTL) compatible digital I/O, and three 16-bit counter/timer channels for timing I/O If additional analog inputs are required, the AMUX-64T analog multiplexer can be used By cascading up to four AMUX-64T s, 256 single-ended or 128 differential inputs can be obtained The AT-MIO-16 also uses the RTSI bus (real-time system interface bus) to synchronize multiboard analog, digital, and counter/timer operations by communicating system-level timing signals between boards Figure 1534 is a block diagram of the AT-MIO-16 circuitry Its major functions are described next
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FOCUS ON MEASUREMENTS
RTSI bus
RTSI bus interface
DAC0 and DAC1
Timer interrupt PC/AT I/O channel PC/AT I/O channel interface circuitry
Timing
Data control
A/D interrupt
A/D conversion timing
5 Channel counter/ timer
DMA interface Interrupt interface A/D FIFO buffer 12-bit ADC S/H S/H Amplifier Analog MUX
Figure 1534 AT-MIO-16 block diagram
Analog Input: The AT-MIO-16 has two CMOS analog input multiplexers connected to 16 analog input channels This data acquisition board has a softwareprogrammable gain ampli er that can be used with voltage gains of 1, 10, 100, or 500 (the AT-MIO-16L) to accommodate low-level analog input
I/O connector
Digital input/ output
15
Electronic Instrumentation and Measurements
signals, or with gains of 1, 2, 4, or 8 (the AT-MIO-16H) for high-level analog input signals The AT-MIO-16 has a 12-bit ADC that gives an analog signal resolution of 488 mV with gain of 1 and an input range of 10 V Finer resolutions up to 488 mV can be achieved by using gain and smaller input ranges The board is available in three speeds: the AT-MIO-16(L/H)-9 contains a 9- s ADC; the AT-MIO-16(L/H)-15 contains a 15- s ADC; and the AT-MIO-16(L/H)-25 contains a 25- s ADC These conversions of the board have the following data acquisition sample rates on a single analog input channel:
Sampling rate Model number AT-MIO-16(L/H)-9 AT-MIO-16(L/H)-15 AT-MIO-16(L/H)-25 Typical case 100 ksamples/s 71 ksamples/s 45 ksamples/s Worst case 91 ksamples/s 59 ksamples/s 37 ksamples/s
The timing of multiple A/D conversion is controlled either by the onboard counter/timer or by external timing signals The onboard sample rate clock and sample counter control the onboard A/D timing The AT-MIO-16 can generate both interrupts and DMA (direct memory access) requests on the PC/AT I/O channel The interrupt can be generated when 1 2 3 4 An A/D conversion is available to be read from the A/D buffer The sample counter reaches its terminal count An error occurs One of the onboard timer clocks generates a pulse
On the other hand, DMA requests can be generated whenever an A/D measurement is available from the A/D buffer Analog Output: The AT-MIO-16 has two double-buffered multiplying 12-bit DACs that are connected to two analog output channels The resolution of the 12-bit DACs is 244 mV in the unipolar mode or 488 mV in the bipolar mode with the onboard 10-V reference Finer resolutions can be achieved by using smaller voltages on the external reference The analog output channels have an accuracy of 05 LSB and a differential linearity of 1 LSB Voltage offset and gain error can be trimmed to zero Digital I/O: The AT-MIO-16 has eight digital I/O lines that are divided into two four-bit ports The digital input circuitry has an eight-bit register that continuously reads the eight digital I/O lines, thus making read-back capability possible for the digital output ports, as well as reading incoming signals The digital I/O lines are TTL-compatible Counter/Timer: The AT-MIO-16 uses the AM9513A counter/timer for time-related functions The AM9513A contains ve independent 16-bit counter/timers
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