Appendix A - Specifications [U12 Datasheet]

Parameter

Conditions

Min

Typical

Max

Units

General

USB Cable Length

3

meters

User Connection(s) Length

CE compliance

3

meters

Supply Current (1)

20

mA

Operating Temperature

-40

85

°C

Clock Error

~ 25 °C

±30

ppm

0 to 70 °C

±50

ppm

-40 to 85 °C

±100

ppm

+5 Volt Power Supply (+5V)

Voltage (Vs) (2)

Self-Powered

4.5

5.25

volts

Bus-Powered

4.1

5.25

volts

Output Current (2) (3)

Self-Powered

450

500

mA

Bus-Powered

50

100

mA

Analog Inputs (AI0 - AI7)

Input Range For Linear Operation

AIx to GND, SE

-10

10

volts

AIx to GND, Diff.

-10

30

volts

Maximum Input Range

AIx to GND

-40

40

volts

Input Current (4)

Vin = +10 volts

70.1

µA

Vin = 0 volts

-11.7

µA

Vin = -10 volts

-93.5

µA

Resolution (No Missing Code)

C/R and Stream

12

bits

Burst Diff. (5)

12

bits

Burst SE (5)

11

bits

Offset

G = 1 to 20

±1 * G

bits

Absolute Accuracy

SE

±0.2

±0.4

% FS

Diff.

±1

% FS

Noise

C/R and Stream

±1

bits

Integral Linearity Error

±1

bits

Differential Linearity Error

±0.5

bits

Repeatability

±1

bits

CAL Accuracy

CAL = 2.5 volts

±0.05

±0.25

%

CAL Current

Source

1

mA

Sink

20

100

µA

Trigger Latency

Burst

25

50

µs

Trigger Pulse Width

Burst

40

µs

Analog Outputs (AO0 & AO1)

Maximum Voltage (6)

No Load

Vs

volts

At 1 mA

0.99 * Vs

volts

At 5 mA

0.96 * Vs

volts

Source Impedance

20

Ω

Output Current

Each AO

30

mA

IO

Low Level Input Voltage

0.8

volts

High Level Input Voltage

3

15

volts

Input Leakage Current (7)

±1

µA

Output Short-Circuit Current (8)

Output High

3.3

mA

Output Voltage (8)

No Load

Vs - 0.4

Vs

volts

At 1 mA

Vs - 1.5

volts

Series Impedance (8)

1500

Ω

D

Low Level Input Voltage (9)

D0 - D12

0.8

volts

D13 - D15

1

volts

High Level Input Voltage (9)

D0 - D12

2

Vs + 0.3

volts

D13 - D15

4

Vs + 0.3

volts

Input Leakage Current (7)

±1

µA

Output Current (9)

Per Line

25

mA

Total D0-D15

200

mA

Output Low Voltage

0.6

volts

Output High Voltage

Vs - 0.7

volts

Series Impedance (9)

Output-High

80

Ω

Output-Low

30

Ω

CNT

Low Voltage (10)

GND

1

volts

High Voltage (10)

3

15

volts

Schmitt Trigger Hysteresis

20-100

mV

Input Leakage Current (7)

±1

µA

Minimum High Time

500

ns

Minimum Low Time

500

ns

Maximum Input Frequency

1

MHz

(1) Current drawn by the LabJack through the USB. The status LED is responsible for 4-5 mA of this current. 

(2) Self-powered would apply to USB hubs with a power supply, all known desktop computer USB hosts, and some notebook computer USB hosts. Bus-powered would apply to USB hubs without a power supply and some notebook computer USB hosts. 

(3) This is the total current that can be sourced by +5V, analog outputs, and digital outputs. 

(4) The input current at each analog input is a function of the voltage at that input (Vin) with respect to ground and can be calculated as: (8.181*Vin - 11.67) μA. 

(5) Single-ended burst mode only returns even binary codes, and thus has a net resolution of 11 bits. In addition, extra noise in burst mode can reduce the effective resolution. 

(6) Maximum analog output voltage is equal to the supply voltage at no load. 

(7) Must also consider current due to 1 MΩ resistor to ground. 

(8) The IO lines each have a 1500 ohm series resistor. 

(9) The D lines have no series resistor. It is up to the user to make sure the maximum voltages and currents are not exceeded.  The internal transistors do have some inherent resistance as specified above. 

(10) CNT is a Schmitt Trigger input.