FEATURES

 Power Supply Voltage VPS Range: 4.5V ∼15V

 Full Swing Output Voltage: 0.2VVPS to 0.8VVPS (input

voltage)

 Maximum Output Current: 500mA

 High Efficiency: ≥80 − no heat sink is needed

 (IOUT=500mA@VLDA=11V&VVPS=15V)

 Wide Modulation Bandwidth: DC ∼ 10kHz

 Dual Independent Current Set Ports

 Direct Digital Modulation Control

 Three Control States: Shutdown, Standby and Operation

 Low Output Current Noise: < 15μAP-P @0.1Hz~10Hz

 High Current Stability: <±300μA@500mA

&−20°C~80°C

 Low Output Ripple Voltage: < 4mV@500kHz

 Fully Shielded

 Compact Size: 25.4×20×5 (mm)

 100 Lead (Pb)-free and RoHS Compliant

DESCRIPTION

This laser driver, ATLS500MA212, is an electronic module

that has all the valuable and important, but often contradict

features simultaneously: Wide input and output voltage

range, high output current capability, high efficiency, low

output noise (but it has a 4mVP-P ripple voltage at 500kHz),

wide modulation bandwidth, and small size. The wide output

voltage range, 0.2VVPS ~ 0.8VVPS, allows driving one or

multiple serial laser diodes at the same time, for up to 500mA

well controlled current at high efficiency. The extremely low

noise between DC ~ 10kHz and low DC current drift make it

ideal for driving diode pumped single mode laser diodes to

achieve mode-hop-free and narrow optical wavelength drift,

thus, long coherent length. Because of the high efficiency, the

laser driver generates small amount of heat, thus, no heat sink

is necessary for normal operation. The fully shielded case

blocks all the incoming and outgoing EMIs (Electro-Magnet

Interferences). Therefore, this laser will not interfere with other

surrounding electronics, nor will be interfered by them. The

small package saves valuable PCB space in laser systems.

Figure 1 shows physical photo of the ATLS500MA212.

This laser driver has two current set ports digitally controlled to

switch between them for setting the output current. This feature

allows modulating the laser digitally with 2 preset current

values.

The actual laser current and laser driver temperature are

monitored by dedicated ports. In case the laser driver

temperature exceeds the limit, 120°C, the laser driver will shut

down the output stage by itself and force the laser drive into

Standby Mode. There is a loop good indication output to tell if

the laser driver works ok.

The laser driver has 3 states: Operation, Standby and Shutdown.

Under Standby mode, all the laser driver components work

except the output stage, see Figure 4. Under Shutdown mode,

all the components of the laser driver stop working and the

power supply current is reduced to < 3μA.

This laser driver generates a high accuracy high stability low

noise, 5μVp-p, 3μVRMS, < 8ppm/°C, 2.5V<±2mV, voltage

reference output which can be used for setting the output

current and also be used as the reference voltage for the ADCs

(Analog to Digital Converters) and/or DACs (Digital to Analog

Converters).

The ATLS500MA212 uses a constant frequency high

efficiency PWM output stage. Its switching signal is taken out

through a buffer at the SYNO port, pin 14, which can be used

by other switch mode electronics as the trigger signal to avoid

frequency beating interference, if the free-run frequency is near

to 500kHz.