iC-NZN
N-TYPE LASER DIODE DRIVER
Rev A1, Page 2/16
DESCRIPTION
Laser diode pulse driver iC-NZN allows CW opera- An averaging current monitor can be set by means of
tion of laser diodes and spike-free switching with de- an external resistor at pin RSI. When the current limit
fined current pulses up to 155 MHz. The optical out- is reached, overcurrent is signalled at NERR and the
put power of the laser diode is set-up by means of an current from pin LDA is limited to the pre-set value
external resistor (RMD/PMD). For laser current con- but the iC is not shut down. There is an additional
trol without a monitor diode, the laser current moni- current limitation in pin LDK that prevents the iC from
tor at pin IMON is utilised. For high pulse frequen- overpowering the laser diode.
cies the device can be switched into controlled burst
mode. A previously settled operating point is main- Setting pin NSLP low, the iC enters a low consump-
tained throughout the burst phase.
tion sleep-mode (< 50 µA typ.).
PACKAGES QFN24 4 mm x 4 mm to JEDEC
PIN CONFIGURATION
PIN FUNCTIONS
No. Name Function
1 VDD Power Supply
23
22
21
19
24
20
2 AVG
3 MD
Enable Averaging Control
APC setup, monitor input
4 IMON Laser Current Monitor
18
17
16
15
14
13
1
2
3
4
5
6
5 CID
6 EP
7 EN
8 TTL
9 VSY
Enable Pulldown Current at CI
Positive LVDS/TTL switching input
Negative LVDS switching input
Enable TTL input
Sync Output Supply Voltage
NZN
10 SYN Sync Output
11 RGND Reference Ground
12 RVDD Reference (P-type laser diodes)
code...
...
13 LDK
Laser Diode Cathode
14 AGND Analog ground
15 CIS
16 CI
17 LDA
18
Power Control Capacitor sense
Power Control Capacitor
Laser Diode Anode
n/c
8
9
12
7
10
11
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).
ICHAUS [ IC-HAUS GMBH ]
