ADLINK Technology USB-1901, User Manual

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4 Introduction
1.4.2 Analog Input
Analog Input (AI)
USB-1901/1902 USB-1903
General
Number of
channels:
(programmable)
Voltage
input 16 single-end (SE) or 8
pseudo-differential input
N/A
Current
Input
N/A 8 differential
A/D converter AD7610 or equivalent
Maximum sampling rate
250K samples/s (single channel)
250K/N-channel samples/s (scanning)
Resolution 16 bit
Input coupling DC
Programmable
input range
Voltage
± 10 V,± 2 V, ± 1 V,
± 200 mV
N/A
Current N/A 0~20 mA
Current-to-voltage
conversion resistor
N/A 249.5
:
Operational common mode
voltage range
± 0.1 V
Overvoltage protection
Power on: continuous ± 15 V
Power off: continuous ± 2 V
FIFO buffer size 4k samples
Data transfers
Programmed I/O, continuous
(bulk transfer
mode)
Channel Gain Queue
configuration size
256
Input impedance >1 G
:
N/A
Trigger source Software, External analog or digital
Trigger mode
Post trigger, delay trigger, post trigger with
re-trigger, delay trigger with re-trigger, gated
trigger
Time-based source Internal 80 MHz