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LJTick-VRef Datasheet

The LJTick-VRef-25 (LJTVR-25) and LJTick-VRef-41 (LJTVR-41) are accessories that provide screw terminal access to stable 2.5V and 4.096V reference voltages. Reference voltages are useful when trying to communicate with several different sensors ranging from temperature, pressure, flow, motion, vibration, force, and more. The VS line on most of our devices is not suitable for direct control of sensors that require noise free voltage sources. Without a stable reference voltages many applications need to use a digital I/O line, one of the analog output channels, or use a secondary power supply. The LJTVR-25 and LJTVR-41 both have a LJT1461A voltage regulator on board to supply 50mA of current to sensors requiring excitation signals. The LJTick-VRef-25 outputs 2.5V and the LJTick-VRef-41 outputs 4.096V.

Common Applications

  • Whenever a regulated 2.5V or 4.1V signal is needed.

Figure 1: LJTick-VRef-25

Figure 1: LJTick-VRef-41

Figure 2: LJTick-VRef-41 With U3

Figure 2: LJTick-VRef-25 With U3

LJTick-VRef-25 Screw Terminal Descriptions

2.500: This screw terminal outputs the 2.5V reference voltage.

GND: Same as LabJack ground.

IOA/IOB: These lines are directly passed through from the screw terminals they are connected to. In Figure 2 they are FIO0 and FIO1.

LJTick-VRef-41 Screw Terminal Descriptions

4.096: This screw terminal outputs the 4.096V reference voltage.

GND: Same as LabJack ground.

IOA/IOB: These lines are directly passed through from the screw terminals they are connected to. In Figure 4 they are FIO0 and FIO1.

LJTick-VRef Schematic

Figure 5: LJTick-VRef Schematic

Specifications

Parameter

Conditions

Min

Typical

Max

Units

 

 

 

 

 

 

Supply Voltage

 

Vout+0.4

 

20

V

Supply Current

No Load

 

0.4

 

mA

Output Voltage
VRef-25

 

2.498

2.5

2.502

V

Output Voltage
VRef-41

 

4.093

4.096

4.099

V

Output Voltage Accuracy

 

-0.08

 

0.08

% full scale

Output Voltage Temperature Coefficient

 

 

5

12

ppm/°C

Output Voltage Noise

0.1Hz ≤ f ≤ 10Hz

 

8

 

ppmP-P

 

10Hz ≤ f ≤ 1kHz

 

9.6

 

ppmRMS

Maximum Load (1)

VS ≥ 4.75V

50

 

 

mA

Maximum Load
Vref-25 (1)

VS ≥ 2.9V

10

 

 

mA

Maximum Load
Vref-41 (1)

VS ≥ 4.5V

10

 

 

mA

Short Circuit Current

 

 

100

 

mA

(1) With a normal supply voltage of ≥ 4.75 volts, the device can meet specifications up to 50 mA.  At lower voltages the output current while meeting specs is limited by the Dropout Voltage spec from the LJ1461 datasheet.

For more specifications refer to the Linear Technology LT1416 datasheet. Both the LJTick-VRef-25 and LJTick-VRef-41 use the "C" variant. The VRef-25 uses the 2.5V variant and the VRef-41 uses the 4.096V variant.

Files

Linear-Technology-LT1416-Datasheet.pdf

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