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LJTick-OutBuff Datasheet

The LJTick-OutBuff (LJTOB) is an output buffer tick that increases the output current of the DAC outputs on LabJack devices. The LJTick-OutBuff can also be used to increase the output abilities of the devices digital I/O lines by switching 3.3V logic. LabJack devices cannot output more than about 15mA on their DAC0 and DAC1 analog outputs so this accessory is helpful for users who want to increase that capability. One common application is to control the speed of a low voltage DC motor.

  • Drives up to 200mA

  • 0-5V output range*

* Max voltage depends on the supplied VS line which is 5V nominally.

Common Applications

  • Controlling LEDs

  • Generating variable stable excitation voltages

Figure 1: LJTick-OutBuff

Figure 2: LJTick-OutBuff With U3

Screw Terminal Descriptions

VS: This is the same 5 volt output as the VS terminals on the LabJack itself. This is an output terminal, not an input. It can be used to provide 5 volt (nominal) power as needed.

GND: Same as LabJack ground (GND).

OBA/OBB: These output lines are generated by the Op Amp and track the input voltage.

LJTick-OutBuff Hardware Block Diagram

Figure 3: LJTick-OutBuff Hardware Block Diagram

LJTick-OutBuff Hardware Block Diagram with Filter

Figure 3: LJTick-OutBuff Hardware Block Diagram with Filter

LJTick-OutBuff Schematic

Figure 3: LJTick-OutBuff Schematic

Specifications

Parameter

Conditions

Min

Typ

Max

Units

Supply Voltage (VS)

 

2.5

 

6

V

Supply Current

No Load

 

1.0

 

mA

Operating Temp

 

-40

 

85

Deg C

 

 

 

 

 

 

Max Output Current

 

 

±320

 

mA

Short-Circuit Current

 

 

800

 

mA

 

 

 

 

 

 

Max Output Voltage

10 mA

VS - 0.3

VS - 0.04

 

V

 

200 mA

VS - 0.55

VS - 0.4

 

V

Min Output Voltage

10 mA

 

0.03

0.1

V

 

200 mA

 

0.38

0.6

V

 

 

 

 

 

 

Offset Error

 

 

175

3500

μV

Gain Error

 

 

 

 

%

Output Noise

 

 

 

 

 

 

 

 

 

 

 

Slew Rate or RC

 

 

 

 

 

Cutoff Frequency (1)

 

 

39

 

kHz

 

 

 

 

 

 

Capacitive Drive (2)

 

 

 

1

nF

(1) Calculated by passing a 0-5V sine wave and measuring the input/output to get a -3dB difference.
(2) Capacitive loads beyond 1 nF might cause the output to oscillate. Add a 20 Ω series resistor to prevent this.

For more specifications about the Op Amp used in the LJTick-OutBuff refer to the Texas Instruments TLV4112 datasheet.

Files

Texas Instruments TLV4112 Datasheet

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