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LJTick-LVDigitalIO Datasheet

Stock: In Stock
Price: $19.00
LabJack LJTick-LVDigitalIO Digital Logic Level Converter Accessory Compatible with LabJack USB, Ethernet, WiFi DAQ Devices

LJTick-LVDigitalIO Overview

The LJTick-LVDigitalIO (LJT-LVDIO) A bidirectional logic shifting board for converting 3.3V logic down to 2.5V or 1.8V. There is also a VOUT terminal which can source power at the selected voltage. Useful for users who have external boards that run on lower logic thresholds, or simply want a 3.3V, 2.5V, or 1.8V supply.

  • Supports bi-directional communication
  • Up to 800kHz
  • 3.3V, 2.5V, or 1.8V
  • VOUT terminal can source up to 200mA

Note: Advanced users may convert the 1.8V option to 5V by installing a jumper on R5, and removing or destroying U3. Instructions for doing this can be found on the modifying the LJTick-LVDigitalIO page.

Common Applications

  • Communicating with SPI, I2C, UART, 1-Wire, and other Digital IO sensors that require a supply voltage that is the same voltage as the logic level.

Figure 1: LJTick-LVDigitalIO

Figure 2: LJTick-LVDigitalIO with U3-LV

Screw Terminal Descriptions

Vout: This voltage can be selected to be either 3.3V, 2.5V, or 1.8V with the slide switch.

GND: Same as LabJack ground (GND).

DIOA/DIOB: These logic input and output lines can be configured to communicate with 3.3V, 2.5V, or 1.8V circuitry.

 

LJTick-LVDigitalIO Hardware Block Diagram

Figure 3: LJTick-LVDigitalIO Hardware Block Diagram

 

LJTick-LVDigitalIO Schematic

Figure 4: LJTick-LVDigitalIO Schematic

 

Specifications:

Parameter Conditions Min Typical Max Units
Supply Voltage   3.6   5.25 V
Supply Current No Load   0.2   mA
Operating Temperature   -40   80 °C
Output Drive Current     100   mA
           
1.8V Logic Voltage          
Vout Output Voltage     1.8   V
Vout Current     300   mA
Rise time     180   ns
Fall time     580   ns
Max Recommended Frequency No load, 50% duty cycle   1   MHz
Logic High     1.78   V
           
2.5V Logic Voltage          
Vout Output Voltage     2.5   V
Vout Current     300   mA
Rise time     560   na
Fall time     640   na
Max Recommended Frequency No load, 50% duty cycle   1   MHz
Logic High     2.46   V
           
3.3V Logic Voltage          
Vout Output Voltage     3.3   V
Vout Current     300   mA
Rise time     2   ns
Fall time     800   ns
Max Recommended Frequency (1) No load, 50% duty cycle   1   MHz
Logic High     3.26   V
Logic High (Vmax) at max frequency 1MHz, no load, 50% duty cycle   3.1   V

(1) Frequencies higher than 350kHz will not produce the full logic high voltage.

For more specifications about the MOSFETs and voltage regulators used in the LJTick-LVDigitalIO look at the following datasheets: