ADLINK USB-2405 - Manual (Page 37)

Operation 27
USB-2405
3 Operation
Operation of the USB-2405 is described here to assist in
configuration and programming of the module. Functions
addressed include analog input and GPIO.
3.1 Functional Layout
The USB-2405 is equipped with four simultaneous-sampling
analog input channels and two general-purpose digital I/Os
(GPIO).
Figure 3-1: USB-2405 Functional Block Diagram
ADLINK
FPGA
Calibration
data
80
51
Cor
e
func
ti
o
n
AFI
2-CH GPIO
Control Signal
DI, DO,
Counter,
PWM OUT,
Trigger IN
GPIO Circuit
24 Bit Sigma-
delta ADC
ADC Front end
DATA
DDR2 SDRAM
U
S
B INTE
RF
ACE
Cypress
CY7C68013A
24MHz XTAL
8051 Core 12/24/
48MHz
GPIO
AI
Data
a
n
d
C
ontrol
EEPROM
EEPROM
AI
Calibration
Control
A/D
Others
4-CH AI
Power
circuit
3.3 2.5 1.2V
Supply
USB BUS
+5V Supply
3.3V Supply
I2C Interface
DDS (Direct
Digital
Synthesis)