iC-NZN

N-TYPE LASER DIODE DRIVER

Rev C1, Page 2/17

DESCRIPTION

Laser diode pulse driver iC-NZN allows CW opera-

tion of laser diodes and spike-free switching with de-

fined current pulses up to 155 MHz. The optical out-

put power of the laser diode is set-up by means of an

external resistor (RMD/PMD). For laser current con-

trol without a monitor diode, the laser current moni-

tor at pin IMON is utilised. For high pulse frequen-

cies the device can be switched into controlled burst

mode. A previously settled operating point is main-

tained throughout the burst phase.

An averaging current monitor can be set by means of

an external resistor at pin RSI. When the current limit

is reached, overcurrent is signalled at NERR and the

current from pin LDA is limited to the pre-set value

but the iC is not shut down. There is an additional

current limitation in pin LDK that prevents the iC from

overpowering the laser diode.

Setting pin NSLP low, the iC enters a low consump-

tion sleep-mode (< 50 µA typ.).

PACKAGING INFORMATION QFN24 4 mm x 4 mm to JEDEC

PIN CONFIGURATION

7

8

9

10

11

1

2

3

4

5

13

14

15

21

22

6

12

16

17

19

20

18

23

24

NZN

code...

...

PIN FUNCTIONS

No. Name Function

1 VDD

Power Supply

2 AVG

Enable Averaging Control

3 MD

APC setup, monitor input

4 IMON Laser Current Monitor

5 CID

Enable Pulldown Current at CI

6 EP

Positive LVDS/TTL switching input

7 EN

Negative LVDS switching input

8 TTL

Enable TTL input

9 VSY

Sync Output Supply Voltage

10 SYN

Sync Output

11 RGND Reference Ground

12 RVDD Reference (P-type laser diodes)

13 LDK

Laser Diode Cathode

14 AGND Analog ground

15 CIS

Power Control Capacitor sense

16 CI

Power Control Capacitor

17 LDA

Laser Diode Anode

18

n/c

19 RSI

Current Monitor Setup

20 REGE Control Enable

21 GND

Ground

22 NSLP Not Sleep-Mode

23 NERR Error Output

24

n/c

The Thermal Pad is to be connected to a Ground Plane (GND) on the PCB.

Only pin 1 marking on top or bottom defines the package orientation (

NZN label and coding is subject

to change).