ADLINK USB-1903 - Manual (Page 49)

Operation 35
USB-1900 Series
4 Operation
Operation of the USB-1900 Series is described here to assist in
configuration and programming of the module. Functions
described include A/D conversion, D/A conversion, programmable
function I/O, and others
4.1 Signal Function
the USB-1900 Series provides 16 single-end channels or 8
pseudo-differential channels of 16-bit A/D input, and two
single-end channels of 16-bit D/A output. Switching the multiple
front-end multiplexers allows all A/D input channels to connect to
one ADC (ADI AD7610 or equivalent). For D/A function, two
analog output channels are generated by one DAC chip (TI
DAC8871). The ADC/DAC controller and all timing control logics
are implemented by the FPGA.
The USB-1900 Series utilizes calibration circuits to provide high
performance and low-temperature drift DC signal sourcing.
Calibration data is saved in the EEPROM. Combining FIFO control
logic and simultaneous update capabilities, the USB-1902 and
USB-1903 provide 2-channel simultaneous basic waveform
generation. General purpose digital IO is controlled directly by the
FPGA, as shown.