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DS2004 High-Speed A/D Board

Fast and precise digitizing of analog signals

The DS2004 High-Speed A/D Board is used in dSPACE modular systems for digitizing analog input signals at high sample rates. The 16-bit A/D converters of the DS2004 are equipped with differential inputs. The board provides many different hardware- and software-based trigger mechanisms as well as data buffers for burst data transfer.

Key Benefits

Each of the DS2004‘s 16 channels has an independent A/D converter with a resolution of 16 bits and differential inputs. The conversion time is 800 ns per channel. The measurement modes plus 4 external trigger inputs and extensive trigger functions enable the conversion of both single measurement values and whole sample bursts. The board buffers up to 16,384 values per channel and then transfers them to the processor board as a burst. This reduces the communication overhead and improves the overall system performance.

 

Application Areas

The DS2004‘s triggered sample mode can be used to record data within a defined window based on trigger events. For example, angle-synchronous measurements of a combustion engine can be started by an external software trigger. Possible applications include cylinder-pressure-based control and the measurement of knock signals in an angle window.

Two Burst Modes

The DS2004‘s burst mode offers two ways of converting measurement values:

  • Continuous sample mode: When one burst of conversions ends, the next burst starts automatically. The conversion of individual measurement values within a burst is triggered by software, an internal timer, or an external trigger.
  • Triggered sample mode: A burst of conversions can be started by software or a trigger event.

Using Real-Time Interface

The Real-Time Interface (RTI) libraries for the A/D board provide RTI blocks that let you implement the functionality and I/O capabilities of the board in Simulink® models. You can add the RTI blocks to a Simulink model via drag & drop.

Parameter Specification
General
  • 16 A/D input channels (differential) n 16 independent A/D converters n 16-bit resolution n 0.8 µs ... 1 s trigger interval (adjustable) n ±5 V or ±10 V input voltage range (programmable for each channel) n ±12 V input voltage working range n 4 external trigger input lines
A/D Channels1), 2) Conversion time
  • 800 ns
Initial offset error
  • ±1 mV
Initial gain error
  • ±0.1% of FSR
  Input offset drift
  • ±2 ppm of FSR/K
  Gain drift
  • ±20 ppm of FSR/K
  Linearity error
  • ±0.003% of FSR
  Differential linearity error
  • ±0.003% of FSR
  Missing codes No missing codes at 15-bit
  SNR (signal-to-noise ratio)
  • ≥+85 dB (at 10 kHz, 10 V range) n ≥+83 dB (at 10 kHz, 5 V range)
  THD (total harmonic distortion)
  • ≤-85 dB (at 10 kHz, 10 V range) n ≤-83 dB (at 10 kHz, 5 V range)
  Channel crosstalk
  • ≤-95 dB
  CMRR (common mode rejection ratio)
  • ≥+85 dB (at 10 kHz signal frequency)
  Input impedance
  • 1 MΩ
  Input overvoltage protection
  • ±50 V continuous, ±60 V for up to 10 s
  Interrupt controller
  • Burst start n Data ready
  • Data lost n Conversion trigger overflow
External trigger input Input voltage
  • CMOS level
Input overvoltage protection
  • ±50 V continuous, ±60 V for 10 s
Host interface
  • One 8- or 16-bit ISA slot (power supply only)
Physical Characteristics Physical size
  • 340 x 125 x 15 mm (13.4 x 4.9 x 0.6 in)
  Ambient temperature
  • 0 … 55 ºC (32 … 131 ºF)
  Power supply
  • +5 V ±5%, max. 1.5 A
  • +12 V ±10%, 1.5 A

1) Speed and timing specifications describe the capabilities of the hardware components and circuits of dSPACE products. Depending on the software complexity, the attainable overall performance can deviate significantly from the hardware specification.
2) Typical values at 25 °C, 16-bit resolution and ±10 V input voltage range (FSR = full-scale range).

 

Basic Information Product Information