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2

Analog Technologies

ATLS100MA104

Low Noise Constant Current Laser Controller

Table 1. Pin Function Descriptions

Pin #

Pin Name

Pin Type

Description

1

SBDN

Analog/Digital

Input

Standby and Shutdown Control. This pin has 3 states: between 0V

∼ 0.4V, it shuts

down the entire laser driver; between 1.2V

∼ 2.4V, it sets the laser driver to standby

mode; between 2.7V

∼ 5.5V, it sets the laser driver to operation mode. The input

current on this pin is <2µA. See Figure 3.

2

GND

Signal ground

Signal ground pin. Connect ADC and DAC grounds to here.

3

2.5VR

Analog output

2.5V reference voltage. It is used by the external DACs as the reference voltage. It can

source 3mA max, with 3.6

4

LIMS

Analog input

Laser current limit set. 0V to 2.5V sets the laser current limit from 0 to 100mA linearly.

5

LIS

Analog input

Laser current set. 0V to 2.5V sets the laser current from 0 to 100mA linearly.

6

LIO

Analog output

Laser current output indication. 0V to 2.5V indicates the laser current from 0 to 100mA

linearly.

7

LPGD

Digital output

Loop good indication. When the controller is working properly, the actual output

current equals the set-point current, this pin goes up; otherwise, it goes down.

8

TMPO

Analog output

The driver internal temperature indication output.

9

LDA

Power output

Laser diode anode. Connect it to the anode of the laser diode. This pin is used to drive

the type of diode laser of which the cathode is connected to its case and the case is

connected to the ground. See below Figure 4, and Figure 5.1 ~ Figure 5.3.

10

LDC

Power output

Laser diode cathode. Connect it directly to the laser’s cathode. See below Figure 4, and

Figure 5.1 ~ Figure 5.3.

11

PGND

Power ground

Power ground pin. Connect it directly to power supply return rail.

12

VPS

Power input

Power supply. The driver works from 3.1V to 5.5V.