TIA100 User Guide

Last updated: 2023-03-09 PDF version
TIA100 Transimpedance amplifier user interface
TIA100 user interface

Power supplies

TIA100 is supplied from the terminal block (green):

  • +VCC: Positive supply input. Connect this pin to a +12 V supply.

  • -VCC: Negative supply input. Connect this pin to a -12 V power supply or a -5 V power supply depending on the switch SW2 (blue) position. -12 V supply is needed for bipolar operation. -5 V supply can be used to reduce power consumption in applications requiring only a positive output voltage.

Output buffer gain

The output buffer gain is adjusted with the switch SW1 (blue). The gain can be 1 (2 kV/A) or 5 (10 kV/A).

Connecting photodiodes

On the diagrams below Cd and Ccoax are the parasitic capacitance of the photodiode and the coaxial cable, respectively.

Single-ended photodetector

TIA100 Transimpedance amplifier single ended photodetector
TIA100 single ended photodetector

Balanced photodetector

TIA100 Transimpedance amplifier balanced photodetector
TIA100 balanced photodetector

Coaxial cable length and input capacitance

The input capacitance is Cin = Cd + Ccoax for a single-ended photodetector and Cin = 2 Cd + Ccoax for a balanced photodetector. The TIA100 is stable with input capacitances up to 200 pF.

For a typical 50 Ω coaxial cable, the capacitance per unit of length is 1 pF/cm. Note that no specific characteristic impedance is required for the input coaxial cable.

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