FEATURES

Ultra Low Noise (RMS): <0.6μARMS@ 0.1Hz ~ 10Hz

High IOUT without Heat Sink: 250mA

High IOUT Absolute Accuracy: 250±0.5 (mA) @ VLIS=2.5V

High IOUT Stability: <±0.5mA @ T = ?30oC ~ 60oC

Independently programmable IOUT and IOUT limit

Loop good indication

Controller internal temperature monitoring

Complete Shielding

Compact Size

100 Lead (Pb)-free and RoHS Compliant

DIP and SMT Packages Available

Soft-Start

Note: The surface mount version is not recommended

for new designs.

DESCRIPTION

The ATLS250MA104 is an electronic module designed for

driving diode lasers with up to 250mA extra low noise

current. The output voltage is 0.5V to 3.5V when powered

by a 5.5V power supply. Figure 1 shows the photo of

ATLS250MA104.

The controller has temperature compensation network so

that the output current maintains the same even as the

controller temperature rises.

In case the controller temperature exceeds a preset limit,

120°C, the controller will be shut down by itself to prevent the

controller from being damaged by the over heat.

The output current of the ATLS250MA104 can be set by an

input voltage linearly or modulated by an external signal of up

to 4.67MHz in bandwidth, resulting in a minimum 75nS rise

and fall times at the output current.

A highly stable low noise 2.5V reference voltage is provided

internally for setting the output current. This reference can also

be used as the voltage reference for external ADCs (Analog to

Digital Converters) and/or DACs (Digital to Analog

Converters) which are utilized for converting the analog signals,

such as LIO which represents the output current, into digital

signals, and/or converting the digital signals into analog ones

for setting the analog voltages, such as LIS which sets the

output current.

The ATLS250MA104 is packaged in a 6 sided metal enclosure,

which blocks EMIs (Electro-Magnetic Interferences) to prevent

the controller and other electronics from interfering each other.

This laser driver can be evaluated by our evaluation board,

ATLS1A103DEV1.0.

There are 2 packaging versions available: DIP through hole

package and surface mount type.

Note: The wire for connecting the controller and the cathode

and anode of the laser diode should be less than 10cm. See

Figure 5.1.