Analog Input Subsystem
C-15
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.
Analog Output Subsystem
The DAS-1800HC models contain two channels of multiplying 12-bit
D/A converters. The outputs, labeled
D/A 0 OUT
[9] and
D/A 1 OUT
[27], are located on the D-type male connector that projects through the
rear panel of the computer.
The DAS-1800ST-DA models offer four channels of multiplying 12-bit
D/A converters and DAS-1802HR-DA models offer two channels of
multiplying 16-bit D/A converters. The DAS-1800ST and DAS-1802HR
models do not provide analog output.
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
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