ADwin-Pro
Hardware, manual version 2.9, June 2006
53
Pro I: Analog Input Modules
Pro-AIn-32/14 Rev. A
ADwin
5.5.7 Pro-AIn-32/14 Rev. A
The analog input module
has a 14 bit ADC and a pro-
grammable gain (PGA). It is equipped with 32 single-ended inputs or 16 differ-
ential inputs (software-selectable). The inputs are connected to a 37-pin DSUB
socket. The module can be combined with Pro-TC and Pro-PT modules.
The module version with current inputs
is decribed on
The module
is an advanced development of the module
. It has an input voltage range of ±10V and a gain, pro-
grammable by software of 1, 2, 4 or 8. The adjustment of gain and offset is
made by software (see
chapter 6.3.1 "Calibration per Software"
).
In addition, the module has a sequential control, which by request reads the
measurement values from all input channels successively.
Fig. 84 –
: Block diagram
After power-up the module is set to 16 differential inputs.
Figures
and
show the pin assignment of the module. Please consider the
different pin assignment for differential and single-ended inputs.
ADwi
n
-P
ro
bus
A
D
1
330k
330k
2
330k
330k
32
330k
330k
. . . . . . . . .
Addr.
Data
Data
Registers
Data
PGA
Vu= 1, 2, 4, 8
3
4
31
. . . . . . . . .
MUX
Address
Decoder
Sequence
Control
Control
Input channels
32 single-ended oder 16 differential
Resolution
14 bit
Conversion time
max. 0.5µs
Sampling rate
max. 2000ksps
Multiplexer settling time
3µs
Measurement ranges
±10V; optional 0…20mA / 16 channels
Gain
1, 2, 4, 8 software selectable
Accuracy
INL
typ. ±0.6 LSB, max. ±1 LSB
DNL
typ. ±0.3 LSB, max. ±1 LSB
With the option ±20mA there is an additional inaccuracy of
0.05% of the measured voltage (by the 500
Ω
shunt).
Input resistance
330k
Ω
, ±2%
Input over-voltage
±35V
Offset error
adjustable
Offset drift
±30 ppm/ºC
Connector
37-pin DSub socket
: Specification