Programmable Gain Control Register / Burst Rate - Measurement Computing CIO-DAS1601/12 Manual

6.1.9

PROGRAMMABLE GAIN CONTROL REGISTER / BURST RATE

BASE ADDRESS + Bh
7 6
X X
BURST RATE is fixed at:
CIO-DAS1602/16 = 13.3 µs between burst samples (75 kHz).
PROGRAMMABLE GAIN CONTROL: Range and gain is controlled by bits G1 and G0. The codes
have different meaning for each board in the DAS1600 family (Table 6-4).
BOARD
CIO-DAS1601/12
CIO-DAS1602/12
and
CIO-DAS1602/16
The range, unipolar or bipolar is controlled by a switch. If your application is better served by
programmable ranges, please consider the CIO-DAS16/Jr or CIO-DAS16/330 boards.
DT-CONNECT NOTE:
To guarantee that DT-Connect is properly initialized prior to any A/D transfer, the DT-Connect
DT-Request handshake line is reset each time this register is written to. Therefore, it is not possible to
use the DT-Connect for A/D sets which involve setting the gain between samples. This is not really a
problem because any such scheme would be low speed and therefore store data to disk, obviating the
need to use DT-Connect to store data on the MEGA-FIFO.
5 4
X X
CIO-DAS1600/12 = 4 µs (250 kHz) between burst samples.
Table 6-4. Range Codes
CODE
0
1
2
3
0
1
2
3
26
3 2
X X
BIPOLAR RANGE
+/-10V
+/-1V
+/-0.1V
+/-0.01V
+/-10V
+/-5V
+/-2.5V
+/-1.25V
1 0
G1 G0
UNIPOLAR RANGE
0 to 10V
0 to 1V
0 to 0.1V
0 to 0.01V
0 to 10V
0 to 5V
0 to 2.5V
0 to 1.25V