L-Card E20-10, Руководство пользователя

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7.1.3. ADc synchronization system
Parameter, characteristics Value
Parameters of SYNC external signal under ADC
conversion frequency external synchronization.
Input TTL-signal with period of 100 – 1000 ns, on-
off time of 1,90...2,10, with front/fall time of max. 5
ns.
ADC synchronization signal parameters:
Propagation delay time in output:
– STAR
Т
signal, max.
–
SYNC signal, max.
One period of ADC start frequency
20 ns
Propagation delay time from output
–
STARТ signal, max.
–
SYNC signal, max.
One period of ADC start frequency
20 ns
Synchronization signal delay time dispersion in
different modules
E20-10:
–
SYNC signals
–
START signals
±8 ns
±one period of ADC start frequency
START external signal duration, min. 50 ns
7.2. DAC
Parameter, characteristics Value
Number of channels 2
Bit depth 12 bits
Settling time
21
8 µs
DC voltage reproducing range ±5 V
Limits of the allowed reduced basic error of
reproducing DC voltage ±0,3 %
Output current 2 mA
Limits of maximum permissible complementary
error against changes in ambient temperature
within operational temperature range, per 10 ºC 0,5 against maximum permissible fundamental
error limits
Output resistance to sustained short circuit Yes
Operational mode Asynchronous
21
This is output signal settling time for DAC used microcircuit without regard for much longer expected time of DAC
control software-based asynchronous delay (p.
5.2.7
).