MIL-DTL-62741A(AT)
TABLE II. Input channel attenuation and select - Continued.
(+)
(-)
Attenuation
BUS
Input voltage
Input
Input
Ratio Accuracy
5
4
3
2
1
0
range
P1-60
P1-1
1:1
-
1
0
X
1
1
1
+5V
P1-69
P1-64
1:1
-
1
1
0
0
X
X
+5V
P1-39
P1-50
7:1
0.1%
1
1
0
1
X
X
+ 35 V
P1-41
P1-50
7:1
0.1%
1
1
1
0
X
X
+ 35 V
P1-63
P1-57
1:1
-
0
0
1
1
0
1
+5V
(X denotes a don't care condition.)
1/ Voltage at P1-83 = Voltage at P1-1, P1-82 is pulled up to +5 Vdc through a
4.7 kilohm (kohm)/resistor.
2/ These channels are intended for voltage division measurements. They are pulled up
through precision 2 kohm resistors to the voltage present at P1 pins 9 and 10 (12 Vdc
in normal use).
3.3.7 Signal processing.
3.3.7.1 Instrumentation amplifier. R3 shall be adjustable so that U10 can provide a
differential gain of 1 + 0.1% from U10-1 (+) and U10-3 (-) to U10-7 with a not less than
74 decibels (dB) CMRR, adjustable by R10, and an offset at U10-7 of not greater than
200 millivolts (mV) when the voltage at U10-1 and U10-3 is zero.
3.3.7.2 Summing amplifier. The ratio of the magnitude of the voltage at U12-14 with
respect to U11-4 shall be 1 + 0.1%. The ratio of the magnitude of the voltage at U12-14 with
respect to U11-1 grounded minus the offset from the previous paragraph shall be not greater than
11 mV.
3.3.7.3 Gain select and accuracy. The gains shown in table III shall be selected when the
data bits shown in table III are applied in accordance with the waveforms shown in figure 4. The
ratio of the magnitude of the voltage at U13-13 with respect to U12-3 shall be as selected
+ 0.098%. When the gain of 1 is selected and the voltage at U12-3 is zero, the voltage at U13-13
shall not exceed 10 mV.
TABLE III. Gain select.
BUS
Gain
7
6
5
4
3
2
1
0
1
X
X
X
X X
X
0
0
10
X
X
X
X X
X
0
1
30
X
X
X
X X
X
1
0
60
X
X
X
X X
X
1
1
(X denotes a don't care condition.)
6
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