ADLINK Technology USB-1901, User Manual

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36 Operation
Figure 4-1: Functional Block Diagram (USB-1902)
4.2 A/D Conversion
When using an A/D converter, the properties of the signal to be
measured must be considered and a channel and connection of
signals to the module selected. Please see Section 2.3: Analog
Input Signal Connection. As well, A/D signal configuration,
including channel, gain, and signal type must be defined and set.
A/D acquisition is initiated by a predefined trigger source. Data
acquisition will commence once a trigger condition is matched.
After A/D conversion, A/D data is buffered in a data FIFO for
transfer into system memory for further processing.
4
0
P
C
O
N
N
E
C
T
O
R
I
N
T
E
R
F
A
C
E
FPGA
C
a
li
b
r
a
ti
o
n
d
a
ta
8
0
5
1
C
o
r
e
fu
n
c
ti
o
n
AFI
General Timer/
Counter
Control signal
DI DO Circuit
General
Timer/
Counter
PWM
DIO circuit
16 Bit DAC
DAC Circuit
16 Bit ADC
AD7610
ADC Front end
2AO
8DI 4DO
16AI
U
S
B
I
N
T
E
R
F
A
C
E
Cypress
CY7C68013A
24MHz XTAL
8051 Core
12/24/48MHz
PWM
Digital I/O,
General Timer/Counter,
Pulse Generation
A
O
d
a
ta
c
o
n
tr
o
l
A
I
D
a
ta
a
n
d
C
o
n
tr
o
l
DATA
EEPROM
EEPROM
A
I
C
a
li
b
r
a
ti
o
n
C
o
n
tr
o
l
A
O
C
a
li
b
r
a
ti
o
n
C
o
n
tr
o
l
O
th
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r
s
Power
Power
circuit
+-13V
+5V Supply