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DNA-CT-602
DNA-CT-602
High Speed Differential Counter/Timer Board
 
The DNA-CT-602 and DNR-CT-602 are differential counter/timer interfaces for “Cube” and RACKtangle I/O chassis respectively. The DNA/DNR versions are electrically identical and provide four independent 32-bit channels, each one having overvoltage protection and opto-isolation. They perform up/down counting in a number of flexible modes using values from a Load Register and two Compare Registers. They can act as an event counter, perform width/ period measurements and run in quadrature-encoder mode where the user sets the direction of the counting. For output modes, the layer offers 1-shot and Universal PWM operation. It also provides edge detection on the ClockIn and Gate pins. The DNx-CT-602 is software compatible with the DNx-CT-601 except for the additional commands which configure and control the Trigger
Output pins. The DNx-CT-602 provides the following 8 counting modes which will accommodate most data acquisition and data logging requirements:
  • Timer
  • PWM generator
  • Continuously updated PWM generator (buffered)
  • Bin counter (number of pulses in specified time interval)
  • Pulse width
  • Pulse period (232 periods max)
  • Quadrature encoder
  • Timebase operation
 
Characteristics:
  • For use in DNA Series "Cube"
  • 4 independent 32-bit counter/timer units
  • Fully differential inputs/outputs at RS-422/485 logic levels
  • 8 Counting modes
  • 32-bit prescaler per channel
  • Internal (66 MHz) or external (max 16.5 MHz) timebases
  • 256 x 32-bit Input FIFO and 256 x 32-bit Output FIFO on each counter
  • Debouncing/glitch removal on external clock and gate inputs
 
Technical Specifications
General
Number of counter/timer units 4
Resolution 32 bits
Prescaler (per channel) 1 (32 bits)
Maximum frequency 16.5 MHz for external input clock; 
66 MHz for internal input clock; 
33 MHz for outputs
Minimum frequency no low limits
On-board FIFOs, per counter Input: 256 x 32; Output: 256 x 32
Minimum pulse width 15.15 nS
Minimum period 30.30 nS
Measurement resolution 15.15 nS (standard mode)
7.5 nS (2X mode)
Debouncer circuit size 16 bits (on GATE and CLKIN)
Compare registers per counter 2
External gates per counter 1, programmable polarity
External triggers per counter 1 (shared with Gate), edge sensitive, programmable polarity
Protection 7 kV ESD, 350V isolation
Input High / Low voltage RS-422/485 compatible
Electrical Isolation 350 Vrms, chan-chan and chan-chassis
Output High / Low voltage RS-422/485 compatible
Input/output buffer chip LTC1686 or equivalent
Power consumption 2W
Operating range Tested -40 to +85 °C
Humidity range 0 - 95%, noncondensing
Vibration IEC 60068-2-6 5 g, 10-500 Hz, sinusoidal
IEC 60068-2-64 5 g (rms), 10-500 Hz, broad-band random
Shock IEC 60068-2-27 50 g, 3 ms half sine, 18 shocks @ 6 orientations
30 g, 11 ms half sine, 18 shocks @ 6 orientations