Chapter 2
Analog Input Timing/Control
DAQ-STC Technical Reference Manual
2-86
©
National Instruments Corporation
2.7.2 Basic Analog Input Timing
The basic analog input functionality provided by the DAQ-STC is to time conversions and
load the resulting data into a FIFO. The primary output signals are CONVERT and SHIFTIN,
and the input signals are SOC and EOC. The timing for these signals is shown in Figure 2-16.
Figure 2-16.
Basic Analog Input Timing
Table 2-3.
Basic Analog Input Timing
Name
Description
Minimum
Maximum
Tcconv
CONVERT_SRC to CONVERT
(internal convert)
19
58
—
CONVERT_SRC to CONVERT
(external convert)
21
65
Tcconvd
OUT_CLK to CONVERT deasserted
12
38
Toconv
CONVERT width
(0.5, 1.5)
(1, 2)
Tsoc
SOC pulsewidth
6
—
Tsoceoc
SOC precedes EOC
25
—
Teoc
EOC pulsewidth
6
—
Teocshft
EOC to SHIFTIN asserted
7
21
CONVERT_SRC
CONVERT
SOC
EOC
SHIFTEN
OVER_DETECT
OUT_CLK
Tcconv
Toconv
Tcsoc
Tcconvd
Tsoceoc
Tsoc
Teoc
Tsover
Teover1
A
B
Teocshft
Tclkshft
Tshft
Teover2
