MAX3656ETG+T Maxim Integrated Products, MAX3656ETG+T Datasheet - Page 13

• Manufacturer Part Number: MAX3656ETG+T
• Description: IC LASR DRVR 2.5GBPS 3.6V 24TQFN
• Manufacturer: Maxim Integrated Products
• Type: Laser Diode Driver (Fiber Optic)r

Specifications of MAX3656ETG+T

• Data Rate: 2.5Gbps
• Number Of Channels: 1
• Voltage - Supply: 3 V ~ 3.6 V
• Current - Supply: 40mA
• Current - Modulation: 85mA
• Current - Bias: 70mA
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 24-TQFN Exposed Pad
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: MAX3656ETG+T; MAX3656ETG+TTR

With PECL signal levels, for single-ended operation of
burst enable, connect the BEN+ to the burst-enable
control. Connect a resistor (R
resistor (R
nation of R
the values of R
age in the range defined in the Electrical
Characteristics table (see Figure 6).
With LVTTL or LVCMOS signal levels, for single-ended
operation of burst enable connect a 3kΩ (R
Figure 7. Single-Ended LVTTL or LVCMOS Biasing for Burst
Enable
LVTTL OR LVCMOS HIGH
LVTTL OR LVCMOS LOW
Running Burst Enable Single-Ended
2
1
) from BEN- to ground. The parallel combi-
and R
1
and R
Applications Information
______________________________________________________________________________________
2
should be less than 1kΩ. Choose
2
to set the common-mode volt-
1
R
) from V
R
4
R
R
5
3
6
= 3kΩ
= 5kΩ
= 5kΩ
= 9kΩ
V
V
155Mbps to 2.5Gbps Burst-Mode
CC
CC
CC
to BEN- and
IN+
IN-
BEN+
BEN-
4
MAX3656
) resistor
from the burst-enable signal to BEN+. Connect a 5kΩ
(R
(R
BEN- to ground. For typical LVTTL or LVCMOS specifi-
cations of V
low, the LVTTL or LVCMOS sources a maximum of
75µA and sinks a maximum of 500µA. See Figure 7 for
setting up the single-ended LVTTL or LVCMOS biasing
for burst enable.
To minimize inductance, keep the connections between
the MAX3656 output pins and laser diode as close as
possible. Place a bypass capacitor as close as possi-
ble to each V
mize stray parasitic capacitance on the BIAS and MD
pins. Use good high-frequency layout techniques and
multilayer boards with uninterrupted ground planes to
minimize EMI and crosstalk.
Using the MAX3656 laser driver alone does not ensure
that a transmitter design is compliant with IEC825. The
entire transmitter circuit and component selections
must be considered. Each user must determine the
level of fault tolerance required by the application, rec-
ognizing that Maxim products are neither designed nor
authorized for use as components in systems intended
for surgical implant into the body, for applications
intended to support or sustain life, or for any other
application in which the failure of a Maxim product
could create a situation where personal injury or death
can occur.
3
5
) resistor from V
) from V
CC
CC
CC
to BEN- and a 9kΩ resistor (R
to 2.0V for a high and 0.8V to 0V for a
connection. Take extra care to mini-
CC
to BEN+. Connect a 5kΩ resistor
Laser Safety and IEC825
Laser Driver
Layout Considerations
6
) from
13