ADwin-Pro II
Hardware, manual Dec. 2018
61
Pro II: Analog Input Modules
Pro II-AIn-16/18-C Rev. E
ADwin
5.5.3 Pro II-AIn-16/18-C Rev. E
Analog input module Pro II-AIn-16/18-C Rev. E with an 18-bit ADC, 16 differ-
ential inputs and a programmable amplifier (PGA). The module can be com-
bined with amplifiers, Pro-TC and Pro-PT modules.
The module has 16 differential current inputs. The inputs are equipped with a
37-pin D-Sub female connector; for pin assignment see fig. 45.
The module variant with voltage inputs Pro II-AIn-32/18-D Rev. E is described
on page 57.
The module Pro II-AIn-16/18-C Rev. E has an input current range of ±20mA
and a software selectable gain of 1, 2, 4 or 8. The adjustment of gain and offset
is done by software (see chapter 6 "Calibration").
Ex works the inputs are connected to the ground of the Pro device. Alterna-
tively a GND level signal–common for all inputs–can be connected to one of
the AGND pins. The ground connection to the Pro device should be split up,
by switching the DIL switch (see fig. 42) to position
GND
LIFT
.
Do not run the module without ground connection.
The module includes a sequential control, which can read measurement val-
ues from several or all input channels sequentially.
The module can control an upper and lower limit for each channel separately.
Fig.
43
–
Pro II-AIn-16/18-C Rev. E: Block diagram
.Input channels:
16 differential via multiplexer
Resolution:
18 bit
Conversion time:
max. 2µs
Sampling rate:
max. 500ksps
Multiplexer settling time:
2.5µs
Measurement range:
±20mA
Gain:
1, 2, 4, 8 software selectable
Accuracy
INL
±4 LSB typical
±0.05% of measured voltage by input resis-
tance
DNL
max. ±1 LSB
±0.05% of measured voltage by input resis-
tance
Input resistance:
500k
Ω
, ±0.05%
Input over-voltage:
±15V
Fig. 44 – Pro II-AIn-16/18-C Rev. E: Specification
ADwin-Pro
II
bus
A
D
1+
1-
16-
.........
addr.
data
Data
Registers
data
PGA
Vu= 1, 2, 4, 8
2+
2-
16+
.........
MUX
Address
Decoder
Sequence
Control
control
R
S
0.05%
330k
330k
500
R
S
0.05%
330k
330k
500
R
S
0.05%
330k
330k
500
