Data Translation DT9857, User Manual, Page: 123 / 192

Supported Device Driver Capabilities
123
Clocks
Table 20: Clock Options
DT9857 or DT9857E A/D D/A
a
a. The DT9857E-8-xAO, DT9857E-16-xAO and their OEM versions do not support the analog output (D/A) subsystem.
DIN DOUT C/T TACH QUAD
Internal Clock Support
SupportsInternalClock Yes Yes Yes
External Clock Support
SupportsExternalClock Yes
b
b. You can connect an external clock to general-purpose counter/timer 0.
Yes
Simultaneous Input/Output on a Single
Clock Signal
SupportsSimultaneousClocking Yes
Base Clock Frequency
BaseClockFrequency 27 MHz
c
c. A 48 MHz reference clock is used to generate the base clock frequency.
27 MHz
b
0 0 48 MHz 12 MHz
Maximum Clock Divider
MaxExtClockDivider 1.0 1.0 1.0 1.0 4,294,967,296 1.0
Minimum Clock Divider
MinExtClockDivider 1.0 1.0 1.0 1.0 2 1.0
Maximum Frequency
MaxFrequency 105.469 kHz 216 kHz 0 0 24 MHz
d
d. The integrity of the signal degrades at frequencies greater than 10 MHz.
1 MHz
Minimum Frequency
MinFrequency 195.3125 Hz 30 kHz 0 0 0.0112 Hz 0.00559 Hz