TIDA-01187: Bias voltages and currents

Lazar Rozenblat1

Prodigy 50 points

Part Number: TIDA-01187

Hi,

What are voltages VD and VL in the schematic and what are approximate current consumptions from VD, VL and 3.3VD?

over 5 years ago

0 Yusuf%20Agoro over 5 years ago

TI__Expert 4880 points

Lazar,

VL refers to the voltage supplied to the laser. VD referes to the voltage supplied to everything else in the circuit.

Additional details on power consumption can be inferred in the following document. http://www.ti.com/lit/ug/tiduc73b/tiduc73b.pdf

Reference section 2.3.6.3 Laser Driver on page 16.

Yusuf

0 Lazar Rozenblat1 over 5 years ago in reply to Yusuf%20Agoro

Prodigy 50 points

Hi, Yusuf,

Thank you for your reply. The rest of the circuit is powered by 3.3VD, but I was wondering about VD. I was not sure if it is a typo (and should be 3.3VD too) or it is a different voltage level.

0 Yusuf%20Agoro over 5 years ago in reply to Lazar Rozenblat1

TI__Expert 4880 points

Hey Lazar,

VD is 6V. It seems that the 3.3V volts is derived from VD.

Thanks

Yusuf

0 Lazar Rozenblat1 over 5 years ago in reply to Yusuf%20Agoro

Prodigy 50 points

Thank you, Yusuf.

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TIDA-01187: Bias voltages and currents