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Evaluates: MAX40025C
MAX40025 Evaluation Kit
General Description Quick Start
The MAX40025 evaluation kit (EV kit) is a fully assembled
Required Equipment
electrical demonstration kit that provides a proven design
MAX40025 EV kit
to evaluate the MAX40025 ultra-low 280ps propagation
6 matched-length SMA cables (preferably up to
delay, ultra-low dispersion comparator. The board
18GHz capable), 2 feet, or less, in length
provides layout options that allow the input termination to
be easily modified for alternative input terminations. The
+3.6V, 100mA DC power supply (V /+SUPPLY)
CC
comparator outputs are designed to drive low voltage
High-speed signal generator with differential outputs
differential signal outputs (LVDS). The LVDS outputs help
capable of generating square waves with < 500ps
minimize power dissipation and interfaces directly with
rise times. (Eg., HP 8131A)
high speed interconnect devices, FPGAs and CPUs. The
High-Speed oscilloscope with 50 Termination
MAX40025 comparator is ideal for time of flight distance
measurement applications.
Procedure
This evaluation kit demonstrates the MAX40025CAWT+ in
The MAX40025 EV kit is fully assembled and tested.
6-pin wafer-level package (WLP). For other available pin-
Follow the steps below to verify board operation.
compatible option (MAX40025AAWT+), contact factory.
Caution: Do not turn on power supply until all connections
are completed.
Features
1) Set the V power supply to +3.3V. Disable V .
CC CC
Fast Propagation Delay: 280ps (Typ)
2) Connect the negative terminal of the V power supply
CC
Low Over-Drive Dispersion: 25ps
to the GND pad. Connect the positive terminal of the
(V = 20mV to 100mV)
OV
V power supply to the +SUPPLY pad.
CC
Supply Voltage 2.7V to 3.6V
3) Set the signal generator to produce an output
square-wave signal of 100mV differential at a
P-P
39.4mW at 2.7V Supply
frequency of 250MHz with a common mode voltage
Power-Efficient LVDS Outputs
of +2.5V. Disable the signal generator outputs.
-40C to +125C Temperature Range
Ordering Information appears at end of data sheet.
MAX40025 EV Kit Photo
319-100306; Rev 2; 3/19MAX40025 Evaluation Kit Evaluates: MAX40025C
4) Connect the signal generator differential outputs to the
Input and Output Termination
edge-mount SMA connector marked INA+ and INA-.
Input Termination
5) Enable power supply. Enable the signal generator.
6) Verify that the supply current is within 5% of 17mA
Terminating Inputs with a 50 Oscilloscope
7) Monitor and verify inputs IN+ TERM and IN- TERM
By default, the EV kit is designed to terminate the inputs
with the oscilloscope. The oscilloscope must be
when 50 oscilloscope probes are connected to the IN+
configured for 50 input termination.
TERM and IN- TERM termination SMA edge connectors.
8) Monitor and verify outputs OUT+ and OUT- with the
When inputs from a signal generator are connected to
oscilloscope. The oscilloscope must be configured
the IN+ and IN- SMA connector inputs, IN+ TERM and
for 50 input termination.
IN- TERM are used to terminate the input signals with
a 50 oscilloscope. This enables the input signals to
Detailed Description of Hardware
be observed at the oscilloscope and at the same time
The MAX40025 EV kit provides a proven design to evaluate
terminates the micro-strip line. Populate R5, R2, R6, and
MAX40025 comparator. The device offers ultra-low 280ps
R3 resistors with 0 resistors when operating this way.
propagation delay, ultra-low dispersion of 25ps.
When a 50 Oscilloscope is Not
Supply Voltage
Terminated at Inputs
The MAX40025 EV kit operates from standard supply
When inputs from a signal generator are connected to the
levels +2.7V to +3.6V. Connect the positive and negative
IN+ and IN- SMA connectors and when it is not desired
supply voltages (ground return) to +SUPPLY and GND pads,
to terminate the inputs to a scope, then the 0 resistor at
respectively.
R2 and R3 resistors must be de-populated and the 100
termination resistor must be populated at R1.
Inputs
This is helpful when high-speed devices (TIAs, differential
The MAX40025 EV kit provides an efficient and simple
amplifiers) connect directly to the inputs of MAX40025 for
method to evaluate the comparator. The inputs to the
signal discrimination.
device are from IN+ and IN- SMA connectors. IN+ TERM
and IN- TERM SMA connectors serve as terminating
Output Termination
leads at the input when using an oscilloscope to terminate
Terminating Outputs with a 50 Oscilloscope
and observe the input signal. During this condition R1 is
not populated. When not using IN+ TERM and IN- TERM By default, the EV kit is designed to terminate the outputs
connectors, R1 should be populated with 100. The when a 50 oscilloscope is connected to the OUT+ and
differential inputs accept input signals in the common OUT- SMAs. C3 and C4 AC coupling capacitors couple
mode range from +1.5V to V + 0.1V. the outputs to the 50 oscilloscope inputs. R4 termination
CC
resistor is not populated in this case.
Outputs
When a 50 Oscilloscope is not
OUT+ and OUT- SMA connectors access the MAX40025
terminated at inputs
outputs. Both OUT+ and OUT- output traces are in default
When connecting to a subsequent high-speed device
AC- coupled for easy evaluation when connecting to a
designed to accept LVDS inputs, then C3 and C4
50 terminated oscilloscope. The outputs OUT+ and
capacitors must be replaced with 0 resistor shorts and
OUT- are 50 single-ended characteristic lines either
R4 resistor must be populated with 100 termination.
terminated by an oscilloscope or a subsequent high-
speed device. The outputs are LVDS levels. When
terminating with a scope, the outputs are AC coupled.
When connecting the outputs to an LVDS device such as
an FPGA, replace the AC coupling capacitors C3 and C4
with 0 shorts and R4 populated with 100 termination
resistor.
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