System description
ADwin
4
ADwin-light-16
, manual version 2.2, December 2004
2.2 ADwin-light-16
Processor and memory
The
ADwin-light-16
system is equipped with the
32 bit signal processor
ADSP 21062 (SHARC) from Analog Devices with floating point and integer
processing. It is responsible for the complete measurement data acquisition,
online processing, and signal output and can instantaneously process - in com-
bination with the A/D-converter - each measurement value with sample rates
of up to 100 kHz.
The
on-chip memory with 256 kB
has a very short access time of 25 ns and
is large enough to hold the complete
ADwin
operating system, the
ADbasic
process and all variables.
In order to get maximum access speed, all inputs and outputs are memory
mapped in the external memory section of the DSP. For buffering larger quan-
tities of data the DSP uses an
external memory
(SDRAM) of
8 MB
.
Analog inputs
In a 37-pin D-SUB socket there are
8 analog inputs
available, which are con-
nected to a multiplexer, whose output signal is converted with a 16 bit ana-
log-to-digital converter (ADC, see figure below).
Fig. 2 – Functions diagram (with USB interface)
Analog outputs
ADwin-light-16
is equipped with
2 analog outputs
with 16 bit resolution and
an output voltage range of -10 V ... +10 V. You can synchronize and calibrate
the output of the voltage of all DACs per software. In order to smooth the output
signal, it passes through a low pass filter with a cut-off frequency of f
c
=
700 kHz.
Digital inputs and outputs
6 digital inputs and 6 digital outputs
are available on the 37-pin D-SUB
socket. The inputs and outputs are TTL-compatible.
Trigger input
ADwin-light-16
is equipped with a trigger input (EVENT, see also chapter 5.2
"Digital Inputs and Outputs"). Thus, processes can be triggered by a signal
(trigger) and completely processed at once (see
ADbasic
manual, chapter
"Processes in the ADwin Operating System").
Scope of delivery
The standard scope of delivery for
ADwin-light-16
:
–
ADwin-light-16
system
– USB or Ethernet connecting cable, length 1.8 m
–
ADwin
-CD-ROM
– Manual "Driver Installation"
– this hardware manual
The additional items for the type with external enclosure (
L16-EXT
) are:
– Power adapter: a slot metal sheet with power supply socket and
PC-internal three-pole connecting cable
– power supply cable (between slot metal sheet and
L16-EXT
)
6 digital inputs
(TTL / 5V-CMOS)
6 digital outputs
(TTL / 5V-CMOS)
16bit / 10µs
A
D
MUX
IN 1
IN 3
IN 5
IN 7
IN 9
IN 11
IN 13
IN 15
D
A
D
A
16bit
16bit
OUT 1
OUT 2
EVENT
InAmp
+
-
OP
+
-
OP
+
-
DIGOUT5:0
CLK 1
CLK 2
two 32 bit
impuls-counter
SHARC
™
ADSP 21062
Analog Devices
8 MB external SDRAM
DIGIN5:0
to PC
USB-
controller
USB
