figuration means the U3 is connected to a high-speed USB2 hub which is
B2 host. Even though the U3 is not a high-speed USB
rovide improved performance.
f increased noise. This is enabled by passing a nonzero value for put_config special
hannel
LJ_chAIN_RESOLUTION. There is also a LongSettling option where additional settling
a
ptions
by default, so the first table above shows the default conditions.
he tables above were measured with U3 hardware version 1.21 which started shipping in late
A “USB high-high” con
then connected to a high-speed US
device, such a configuration does p
The analog inputs have a QuickSample option where each conversion is done faster at the
expense o
c
time is added between the internal mulitplexer configuration and the analog to digital
conversion. This allows signals with more source impedance, and is enabled by passing
nonzero value for put_config special channel
LJ_chAIN_SETTLING_TIME. Both of these o
are disabled
The first row in each of the above tables (# AIN = 0) includes a write and read to all I/O on the
U3 besides analog inputs (digital I/O, DAC0, timers, and counters).
T
August of 2006. The times could be up to twice as long with hardware version 1.20 or less.
41
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