Analog Input Subsystem
C-15
The values returned by the A/D converter range from -2048 to 2047 in
bipolar mode and 0 to 4095 for unipolar mode independent of the gain or
channel configuration. For a 12-bit A/D at a gain of 100 in the ±100mV
range (bipolar mode), the voltage resolution would be
A/D Conversion Delay
The maximum A/D conversion delay is 833 seconds (13 min, 53 sec) or a
minimum sampling rate of 0.0012Hz with a 5MHz master clock input
frequency.
The minimum A/D conversion delay is 30 clock tics at 200ns per tic
(5MHz clock) or 3µs. The DAS-1800 series can sample at a maximum
rate of 333kHz for one channel and 312kHz for multiple channels.
A/D Data Lost
The DAS-1800 provides hardware monitoring of A/D data overruns.
DriverLINX notifies applications that an overrun has occurred by posting
an event message, DL_DATALOST. DriverLINX posts this message only
the first time the board detects an overrun during an acquisition task. The
DAS-1800 hardware will stop acquisition when an overrun has occurred.
Table C-6. Input Voltage and A/D Binary Value
Input Voltage
A/D Binary Value
-100.0mV -2048
0.0V 0
48.8µV 2046
+99.9512mV 2047
200mV
4096
------------------
48.8
µ
V
=
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