MAX3656EVKIT+ Maxim Integrated, MAX3656EVKIT+ Datasheet - Page 2

• Manufacturer Part Number: MAX3656EVKIT+
• Description: Power Management IC Development Tools MAX3656 Eval Kit
• Manufacturer: Maxim Integrated
• Series: MAX3656r

MAX3656 Evaluation Kit
To evaluate the MAX3656 with a laser diode, configure
the EV kit as follows:
1) Pull shunts off all jumpers (JP33, JP30, JP32, JP26,
2) Set R
3) Set R
4) Set R
5) Connect the EN pin to GND by installing a shunt on
6) Connect the LONGB pin to GND by installing a shunt
7) Solder a laser to edge connection D5. See Figure 1
8) Connect a differential data source to IN+ (J26) and
9) Attach a +3.3V power supply to J18 (+3.3V) and J20
10) Connect the output of the user-supplied laser
2
______________________________________________________________________________________
and JP28).
variable resistor R79 until the measured resistance
between the VAR pin of jumper JP33 and GND is
20kI. Then install a shunt on the VAR side of jumper
JP33.
variable resistor R59 until the measured resistance
between the VAR pin of jumper JP30 and GND is
20kI. Then install a shunt on the VAR side of jumper
JP30.
variable resistor R90 until the measured resistance
between the VAR pin of jumper JP32 and GND is
7kI. Then install a shunt on the VAR side of jumper
JP32.
the GND side of jumper JP26.
on the GND side of jumper JP28.
for a view of how the laser should be mounted on the
EV kit. Be sure to keep the laser leads as short as
possible to minimize parasitic inductance.
IN- (J25) and a differential burst-enable source
to BEN+ (J24) and BEN- (J23). Make sure the
differential signals are between 200mV
1600mV
(V
Information section for more options.
(GND). Set the current limit to 250mA.
to an optical-to-electrical converter that has the
appropriate bandwidth (filter) for the intended
application.
CC
- 1.49V) and (V
MODSET
BIASMAX
APCSET
P-P
and the common-mode is between
to 20kI by adjusting the APCSET
to 20kI by adjusting the MODSET
to 7kI by adjusting the BIASMAX
CC
- V
IN
/4). See the Applications
Quick Start
P-P
and
11) Turn on the power supply and adjust APCSET (R79)
12) If the eye diagram contains too much overshoot or
For continuous mode operation, switch the differential
burst-enable input (BENQ) to a constant high in one of
two ways:
•
•
If needed, an LVPECL Thevenin equivalent load
termination of 50I to (V
the following:
•
•
•
For more information, refer to Application Note 291:
HFAN-01.0: Introduction to LVDS, PECL, and CML.
To drive the burst-enable input (BEN+) with single-
ended LVCMOS levels, do the following:
•
•
•
•
for the desired average optical power, then adjust
MODSET (R59) for the desired extinction ratio.
Note: The APC loop is functional when the FAIL
indicator, green LED D2, is on. The LED is off if the
BIASMAX is set too low, the monitor diode (MD) pin
is not connected, or the modulation current is set too
high.
the rise/fall times are too slow, experimentally adjust
the values of the RL peaking network (R3, L1) and
RC shunt network (R121, C24) to better match the
characteristics of the laser.
Remove resistor R103. Install a 1kI resistor on R101
and 3kI resistors on R91, R92, and R100.
Connect a +2.3V supply to BEN+ and a +1.7V
supply to BEN- (or a differential 0.6V supply between
BEN+ and BEN-).
Remove resistors R103 and R104.
Solder 130I resistors on R92, R94, R98, and R101.
Solder 82I resistors on R91, R95, R97, and R100.
Remove resistors R103 and R114.
Solder 3kI resistor on R114.
Solder 5kI resistors on R101 and R92.
Solder 9kI resistor on R91.
Applications Information
Continuous Mode Operation
LVPECL Input Terminations
CC
- 2V) can be created by doing
LVCMOS Burst Enable