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Appendix A - Specifications [U6 Datasheet]

Specifications at 25 degrees C and Vusb/Vext = 5.0V, except where noted.

USB Cable Length   5meters
Supply Voltage (1) 4.7555.25volts
Supply Current (2)  100 mA
Operating Temperature -40 85°C
Clock Error~ 25 °C  ±30ppm
 -10 to 60 °C  ±50ppm
 -40 to 85 °C  ±100ppm
Typ. Command Execution Time (3)USB High-High0.6  ms
 USB Other4  ms
Vs Outputs     
Typical Voltage (4)Self-Powered4.7555.25volts
Maximum Current (4)Self-Powered 400 mA
 Bus-Powered 0 mA
Vm+/Vm- Outputs     
Typical VoltageNo-load ±13 volts
 @ 2.5 mA ±12 volts
Maximum Current  2.5 mA
10UA & 200UA Current Outputs     
Absolute Accuracy (5)~ 25 °C ±0.1±0.2%
Temperature CoefficientSee Section 2.5   ppm/°C
Maximum Voltage  VS - 2.0 volts
(1) Device should operate down to about 3.5 volts, with the following considerations. The hi-res converter on the U6-Pro is not specified for operation below 4.75 volts. The voltage drive capability of the current sources will be reduced. The maximum output of the DACs will be limited by VS. The input range of the analog inputs will be reduced approximately 3 volts for each 1 volt that VS is below 4.5 volts.     
(2) Typical current drawn by the U6 itself, not including any user connections     
(3) Total typical time to execute a single Feedback function with no analog inputs. Measured by timing a Windows application that performs 1000 calls to the Feedback function. See Section 3.1 for more timing information     
(4) These specifications are related to the power provided by the host/hub. Self- and bus-powered describes the host/hub. not the U6. Self-powered would apply to USB hubs with a power supply, all known desktop computer USB hosts, and some notebook computer USB hosts. And example of bus powered would be a hub with no power supply, or many PDA ports. The current rating is the maximum current that should be sourced through the U6 and out of the Vs terminals     
(5) This is compared to the value stored during factory calibration     
Analog Inputs     
Typical Input Range (6)Gain=1-10.6 10.1volts
 Gain=10-1.06 1.01volts
 Gain=100-0.106 0.101volts
 Gain=1000-0.0106 0.0101volts
Max AIN Voltage to GND (7)Valid Readings-11.5 11.5volts
Max AIN Voltage to GND (8)No Damage-20 20volts
Input Bias Current (9)  20 nA
Input Impedance (9)  1 
Source Impedance (9)  1 
Integral Linearity ErrorRange=±10, ±1, ±0.1  ±0.01% FS
 Range=±0.01  ±0.1% FS
Absolute AccuracyRange=±10, ±1, ±0.1  ±0.01% FS
 Range=±10  ±2000μV
 Range=±1  ±200μV
 Range=±0.1  ±20μV
 Range=±0.01  ±0.1% FS
 Range=±0.01  ±20μV
Temperature Drift  15 ppm/°C
Channel Crosstalk (10)< 1kHz -100 dB
 1kHz - 50kHz 20 dB/dec
Noise (Peak-To-Peak)See Appendix B  <1μV
Effective Resolution (RMS)See Appendix B  22bits
Noise-Free ResolutionSee Appendix B  20bits
Command/Response SpeedSee Section 3.1    
Stream PerformanceSee Section 3.2    
(6) Differential or single-ended     
(7) This is the maximum voltage on any AIN pin compared to ground for valid measurements on that channel. For single-ended readings on the channel itself, inputs are limited by the "Typical Input Range" above, and for differential readings consult the signal range tables in Section 2.6.5. Further, if a channel has over 13.0 volts compared to ground, readings on other channels could be affected. Because all even channels are on 1 front-end mux, and all odd channels on a 2nd front-end mux, an overvoltage (>13V) on a single channel will generally affect only even or only odd channels.     
(8) Maximum voltage, compared to ground, to avoid damage to the device. Protection level is the same whether the device is powered or not.  This spec is continuous.  The device can handle brief transients with much higher voltages (e.g. ESD). 
(9) The key specification here is the maximum source impedance. As long as the source impedance is not over this value, there will be no substantial errors due to impedance problems. For source impedance greater than this value, there are two error sources that need to be considered. First, there is a simple offset error due to the input bias current flowing through the source impedance. Second, if sampling more than 1 channel, there can be a more complex settling error if the analog input system needs to quickly swing from one voltage to another. Required settling time to meet specifications can depend on the source impedance of the signal, channel order, resolution index, and gain/range.     
(10) Typical crosstalk on a grounded AIN pin, with 20Vpp sine wave on
adjacent AIN pin. An adjacent AIN pin refers to multiplexer channel
location not channel number, e.g. AIN0-AIN2 or AIN1-AIN3 pairs.     
Analog Outputs (DAC)     
Nominal Output Range (11)No Load0.04 4.95volts
 @ ±2.5 mA0.255 4.775volts
Resolution  12 bits
Absolute Accuracy5% to 95% FS ±0.1 % FS
Integral Linearity Error  ±0.35±1counts
Differential Linearity Error  ±0.1±0.5counts
Error Due To Loading@ 100 µA 0.1 %
 @ 1 mA 1 %
Source Impedance  50 Ω
Short Circuit Current (12)Max to GND 50 mA
Time Constant  300 μs
Digital I/O, Timers, Counters     
Low Level Input Voltage -0.3 0.8volts
High Level Input Voltage 2 5.8volts
Maximum Input Voltage (13)FIO-10 10volts
 EIO/CIO-6 6volts
Output Low Voltage (14)No Load 0 volts
--- FIOSinking 1 mA 0.55 volts
--- EIO/CIOSinking 1 mA 0.18 volts
--- EIO/CIOSinking 5 mA 0.9 volts
Output High Voltage (14)No Load 3.3 volts
--- FIOSourcing 1 mA 2.75 volts
--- EIO/CIOSourcing 1 mA 3.12 volts
--- EIO/CIOSourcing 5 mA 2.4 volts
Short Circut Current (14)FIO 6 mA
 EIO/CIO 16 mA
Output Impedance (14)FIO 550 Ω
 EIO/CIO 180 Ω
Counter Input Frequency (15)   8MHz
Input Timer Total Edge Rate (16)No Stream  30000edges/s
 While Streaming  7000edges/s
(11) 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 driver voltages close to the power rails, decreases with increasing output current, but in most applications the output is not sinking/source much current as the output voltage approaches GND.     
(12) Continuous short circuit will not cause damage.     
(13) 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 recommended when the U3 is unpowered, as the voltage will attempt to supply operating power to the U3 possibly causing poor start-up behavior.     
(14) 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 16 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.     
(15) Hardware counters. 0 to 3.3 volt square wave.     
(16) 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.     
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