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Overview
The DT9840 Series is a complete data
acquisition system for real-time signal capture and processing. With a
variety of I/O and programming options, the DT9840 Series provides an ideal
platform for real-time applications. Included in the series are the DT9841,
DT9842/2, and DT9842/8 modules. Each module contains an embedded DSP
processor for real-time control and a high-speed USB 2.0 interface for
communicating to a host PC. The DT9841 module features 24-bit Delta-Sigma
converters - great for noise and vibration testing. The DT9842/2 and
DT9842/8 modules feature 16-bit successive-approximation converters - great
for fast control loop operations. All modules provide simultaneous
acquisition and control of up to 8 analog input channels, 2 analog output
channels (8 on the DT9842/8), 24 digital I/O lines, and 3 32-bit counter
/timer channels at up to 100kHz. And, if you need more I/O, simply connect
up to eight DT9840 Series modules together! A variety of memory and
packaging configurations are available to suit your application needs. To
get up and running quickly, use the DT Dynamic Signal Analyzer application,
included with DT Measure Foundry/RT-Streaming, to stream realtime data
between the PC and your DT9840 Series module right out of the box - without
programming! You can modify this application as you wish or configure a
complete real-time system using the property pages of DT Measure Foundry
/RT-Streaming. Or, if you need more flexibility, develop your own low-level
DSP application using TI Code Composer Studio. Select the software solution
that's right for you! |
MODEL
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DT-9841
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DT-9842/2
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DT-9842/8
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Applications
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Noise, Vibration, Biomedical, Acoustics,
Sonar, Modal Analysis |
Fast Control Loops,
Automotive Test, Rotating Machinery, Adaptive Filtering |
DSP
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Processor
|
TI 6713 |
TI 6713 |
Clock
|
300MHz |
300MHz |
A/D and D/A
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Converter
|
Delta-Sigma |
Successive Approximation |
Filtering
|
Yes |
No |
Response Time (100kHz)
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370µs |
10µs |
Vertical Resolution
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24-bit |
16-bit |
A/D Connection
|
Differential |
Single-Ended |
Signal-to-Noise Ratio
|
110dB |
86dB |
Sampling Rate
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200Hz to 100kHz |
0 to 100kHz |
Analog Inputs
(simultaneous)
|
8 |
8 |
Analog Outputs
(simultaneous)
|
2 |
2 |
8 |
Digital I/O (progr)
|
24 |
24 |
Counter/Timers
|
3x 32-bit |
3x 32-bit |
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A/D Conversion
Delta-Sigma
converters offer the following advantages for analog input
operations, making them ideal for noise and vibration testing
applications:
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Reduce
noise and improve accuracy by oversampling each input up to 64
times
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Eliminate
errors that result from aliasing and high frequency noise by
using a built-in decimation filter when sampling between 200Hz
and 5kHz
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Provide
excellent low-level signal-to-noise performance, which improves
dynamic accuracy on low-level signals
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Provide
excellent differential linearity, which ensures consistently
accurate data conversion across the full input range
Because of
their inherent filtering algorithms, though, Delta-Sigma converters
also have an initial delay of 37 clock pulses (370 µs at 100 kHz)
after the sample clock is first started and before the first
conversion is completed.
Thereafter, the data is converted without delay (at 100 kHz,
sampling occurs
every 10 µs). In fast control-loop applications, this initial delay
is unacceptable. For these applications, successive-approximation
converters are the best choice. Successive-approximation converters
always run as fast as possible because no filtering is performed (at
100 kHz, sampling occurs every 10 µs). In addition, they have
extremely low aperture uncertainty (5ns jitter) for minimal phase
error and very accurate comparison/ correlation of high-speed analog
signals. |
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