User`s manual

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.
40P CONNECTOR
INTERFACE
FPGA
Calibration
data
8051 Core
function
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
USB INTERFACE
Cypress
CY7C68013A
24MHz XTAL
8051 Core
12/24/48MHz
PWM
Digital I/O,
General Timer/Counter,
Pulse Generation
AO data
control
AI Data and
Control
DATA
EEPROM
EEPROM
AI
Calibration
Control
AO
Calibration
Control
Others
Power
Power
circuit
+-13V
+5V Supply