MAX3669EHJ+ Maxim Integrated Products, MAX3669EHJ+ Datasheet - Page 11

• Manufacturer Part Number: MAX3669EHJ+
• Description: IC LASR DRVR 622MBPS 5.5V 32TQFP
• Manufacturer: Maxim Integrated Products
• Type: Laser Diode Driver (Fiber Optic)r

Specifications of MAX3669EHJ+

• Data Rate: 622Mbps
• Number Of Channels: 1
• Voltage - Supply: 3.14 V ~ 5.5 V
• Current - Supply: 40mA
• Current - Modulation: 75mA
• Current - Bias: 80mA
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-TQFP, 32-VQFP
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

At +5V power supply, the headroom voltage for the
MAX3669 is significantly improved. In this case, it is
possible to achieve a modulation current of more than
50mA (using resistor pullups as shown in the Typical
Operating Circuit). The MAX3669 can also be DC-coupled
to a laser diode when operating at +5V supply; the volt-
age at OUT+ should be ≥ 2.0V for proper operation.
For high current density and reliable operation, the
MAX3669 uses gold metalization. Make connections to
the die with gold wire only, using ball-bonding tech-
niques. Wedge bonding is not recommended. Die-pad
size is 4 mils (100µm) square, and die thickness is 12
mils (300µm).
To minimize inductance, keep the connections between
the MAX3669 output pins and LD as close as possible.
TOP VIEW
MODMON
BIASMON
DATA+
Laser Driver with Current Monitors and APC
DATA-
GND
V
V
V
CC
CC
CC
1
2
3
4
5
6
7
8
______________________________________________________________________________________
32
9
31
10
Layout Considerations
30
11
MAX3669
29
12
TQFP
Wire Bonding Die
13
28
14
27
15
26
16
25
+3.3V, 622Mbps SDH/SONET
24
23
22
21
20
19
18
17
V
MD
GND
GND
V
OUT-
OUT+
V
CC
CC
CC
Optimize the laser diode performance by placing a
bypass capacitor as close as possible to the laser
anode. Use good high-frequency layout techniques
and multilayer boards with uninterrupted ground planes
to minimize EMI and crosstalk.
Using the MAX3669 laser driver alone does not ensure
that a transmitter design is compliant with IEC 825. The
entire transmitter circuit and component selections must
be considered. Customers must determine the level of
fault tolerance required by their application, recognizing
that Maxim products are not designed or authorized for
use as components in systems intended for surgical
implant into the body, for applications intended to sup-
port or sustain life, or for any other application where the
failure of a Maxim product could create a situation
where personal injury or death may occur.
MODMON
BIASMON
DATA+
DATA-
GND
V
CC
1
2
3
4
5
6
24
7
23
8
Laser Safety and IEC 825
THIN QFN
MAX3669
22
9
Pin Configurations
21
10
20
11
19
12
18
17
16
15
14
13
MD
GND
V
OUT-
OUT+
V
CC
CC
11