Measurement Computing USB-1608GX-2AO-OEM - Manual (Page 6)

6
Chapter 1
Introducing the USB-1608GX-2AO-OEM
The USB-1608GX-2AO-OEM is a USB 2.0 high-speed device that provides the following features:
 16 single-ended (SE) or eight differential (DIFF) analog input channels
 Two analog output channels
 Eight individually configurable digital I/O channels
 Two counter channels (32-bit) that count TTL pulses
 One timer output channel (32-bit)
 Header connectors for field wiring connections
The USB-1608GX-2AO-OEM device is compatible with both USB 1.1 and USB 2.0 ports. The speed of the
device may be limited when using a USB 1.1 port due to the difference in transfer rates on the USB 1.1 versions
of the protocol (low-speed and full-speed).
The USB-1608GX-2AO-OEM is powered by the +5 volt USB supply from your computer, and requires no
external power.
Caution! There are no product safety, electromagnetic compatibility (EMC), or CE marking compliance
claims made for theUSB-1608GX-2AO-OEM. The USB-1608GX-2AO-OEM is intended for use
as a component of a larger system. MCC can help developers meet their compliance requirements.
The end product supplier, however, is responsible for conforming to any and all compliance
requirements.
Functional block diagram
USB-1608GX-2AO-OEM functions are illustrated in the block diagram shown here.
Figure 1. Functional block diagram
FPGA
Mux A/D PGA
DIO
Protection
8
Data
Bus
Microcontroller with
High-Speed
USB 2.0
Compliant Interface
FIFO
Bus
Clock
USB
D+/D–
Power
Supplies
+16.5 V
– 16.5 V
1.2 V
3.3 V
5 V
V BUS
(5 V)
3.3 V
Always On
ENABLEs
Bitwise
Programmable
DIO
Amp
Registers
SPI
8
Calibration
Voltage
Sources
Registers D/A Amp
Amp D/A
8
AI
AI
EEPROM
Crystal
Oscillator
Trigger
A/D Clock In
A/D Clock Out
Counter In 1
Timer Out
D/A Clock In
D/A Clock Out
Counter In 0
SPI
SPI
Signal I/O Connector
Signal I/O Connector