Parameter Conditions Min Typical Max Units
Analog Outputs (DAC)
Nominal Output Range (1) No Load 0.04 4.95 volts
@ ±2.5 mA 0.225 4.775 volts
Resolution 8 bits
Absolute Accuracy 5% to 95% FS ±0.1 % FS
Integral Linearity Error ±1 counts
Differential Linearity Error ±1 counts
Error Due To Loading
@ 100
0.1 %
@ 1 mA 1 %
Source Impedance 50 Ω
Short Circuit Current (2) Max to GND 45 mA
Slew Rate 0.4 V/ms
Digital I/O, Timers, Counters
Low Level Input Voltage -0.3 0.8 volts
High Level Input Voltage 2 5.8 volts
Maximum Input Voltage (3) FIO -10 10 volts
EIO/CIO -6 6 volts
Output Low Voltage (4) No Load 0 volts
FIO Sinking 1 mA 0.55 volts
EIO/CIO/MIO Sinking 1 mA 0.18 volts
EIO/CIO
/MIO Sinking 5 mA 0.9 volts
utput High Voltage (4) No Load 3.3 volts
IO Sourcing 1 mA 2.75 volts
EIO/CIO/MIO Sourcing 1 mA 3.12 volts
EIO/CIO/MIO Sourcing 5 mA 2.4 volts
Short Circuit Current (4) FIO 6 mA
EIO/CIO 18 mA
Output Impedance (4) FIO 550 Ω
EIO/CIO 180 Ω
Counter Input Frequency (5) Hardware V1.21 8 MHz
Input Timer Total Edge Rate (6) No Stream, V1.21 30000 edges/s
While Streaming 7000 edges/s
(2) Continuous short circuit will not cause damage.
(5) Hardware counters. 0 to 3.3 volt square wave. Limit about 2 MHz with older hardware versions.
(1) Maximum and minimum analog output voltage is limited by the supply voltages (Vs and GND). The specifications
assume Vs is 5.0 volts. Also, the ability of the DAC output buffer to drive voltages close to the power rails, decreases with
increasing output current, but in most applications the output is not sinking/sourcing much current as the output voltage
approaches GND.
(3) Maximum voltage to avoid damage to the device. Protection works whether the device is powered or not, but continuous
voltages over 5.8 volts or less than -0.3 volts are not recommened when the U3 is unpowered, as the voltage will attempt to
supply operating power to the U3 possibly causing poor start-up behavior.
(6) To avoid missing edges, keep the total number of applicable edges on all applicable timers below this limit. See Section
2.9 for more information. Limit about 10000 with older hardware versions.
(4) These specifications provide the answer to the question: "How much current can the digital I/O sink or source?". For
instance, if EIO0 is configured as output-high and shorted to ground, the current sourced by EIO0 into ground will be about 18
mA (3.3/180). If connected to a load that draws 5 mA, EIO0 can provide that current but the voltage will droop to about 2.4
volts instead of the nominal 3.3 volts. If connected to a 180 ohm load to ground, the resulting voltage and current will be
about 1.65 volts @ 9 mA.
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