L-Card E20-10, User Manual, Page: 31 / 67

be incorrectly to feed SYNC pulses outside more rapidly than in 100 ns (10 MHz) or less often than
in 1000 ns (1.0 MHz), because under this mode SYNC pulse is fed directly to ADC LTC2245, and,
according to manufacturer's documents, this ADC operates within conversion frequency range of
from 1.0 to 10 MHz. Severe requirements are also posed on SYNC signal on-off time (p.
7.1.3) . It is
natural, that SYNC signal from "master" E20-10 complies with these requirements.
Note, that TTL-line DI16/START configurated "on input", electrically has pull-up resistor
(providing specific one state of unconnected input), and TTL-line SYNC configurated "on input"
does not have pull-up resistor, i. e.
certainty of SYNC unconnected input state is not provided , table
6-2.