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Analog Technologies

ATLS216EV1.0

Evaluation Board for ATLSXA216D

There is no component in the bottom side of the board, so

that there is no bottom silkscreen layer image. Figure 4

shows the top layers without the silkscreen layer. Figure 5

shows the bottom layers, including bottom copper, bottom

solder mask, and multilayer (vias and holes). Please notice

that it is a “see through” image from the top side.

The schematic is shown in Figure 6 below.

Please notice that when the laser driver works well, the

LPGD pin goes up, which drives the R1 pin2 high, the

voltage is divided by the 2 resistor voltage divider, Q1 base

getting this voltage, R3 gets a constant voltage, generate a

constant current, which is injected to the emitter pin of Q1.

Since the collector current is equal to the emitter current,

thus, Q1 outputs a constant current which is independent of

constant current all the time, its brightness remains the same.

The switch S3 and S4 disconnect the POTs on the board

when using external sources to modulate the laser driver

output currents.

Figure 6. Schematic of Laser Driver ATLSXA216D Evaluation Board ATLS216EV1.0