Data Translation DT9816 Series, User Manual

Page: 93 / 108

Specifications
93
External Clock Specifications
Table 29 lists the external A/D clock specifications DT9816 Series modules.
Table 29: External A/D Clock Specifications
Feature DT9816 Series Specifications
Input type HCT rising-edge sensitive
a
a. The external clock input has a 22.1 k
Ω
pull-up to +5 V. Therefore, when this pin is unconnected, the
signal goes to +5 V.
Inputs
High input voltage:
Low input voltage: 2.4 V min
0.8 V max
Minimum pulse width
High:
Low: 3.4
μ
s (666.7 ns for DT9816-S and DT9816-S-WTR)
3.3
μ
s (666.7 ns for DT9816-S and DT9816-S-WTR)
Maximum frequency 150 kHz (750 kHz for DT9816-S and DT9816-S-WTR)
External clock divider 1
b
b. On the DT9816 and DT9816-A, the base clock frequency of the internal clock is divided by 12, resulting
in an effective base clock frequency of 4 MHz for the internal clock. On the DT9816-S and
DT9816-S-WTR, the internal base clock frequency is divided by 4, resulting in an effective base clock
frequency of 12 MHz for the internal clock. The driver divides the effective base clock frequency by an
internal clock divider from 2 to 65534 to achieve the desired sampling frequency.