MAX3272 EV Kit
General Description
The MAX3272 evaluation kit (EV kit) is fully assembled
and tested to provide easy evaluation of the MAX3272
3.3V, 2.5Gbps low-power limiting amplifier. The EV kit
also includes a calibration strip to enable accurate jitter
and edge speed measurements.
Features
o Single +3.3V Power Supply
o Fully Assembled and Tested
o Includes Calibration Strip for Accurate
Measurements
o EV Kit Designed for 50 Interfaces
o Easy LOS Threshold Programming
o Easy Output Polarity Control
Evaluates: MAX3272
MAX3272 Evaluation Kit
________________________________________________________________ Maxim Integrated Products
1
19-2364; Rev 0; 3/02
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
Quick Start
1) Connect a shunt across pins 1 (VCC) and 2 of
jumper J9 for no inversion in the output polarity.
2) Ensure that J13 is open.
3) Connect OUT+ and OUT- to a 50
terminated
oscilloscope.
4) Apply a differential input (15mV
P-P
to 1200mV
P-P
)
between IN+ and IN-.
5) Connect a +3.3V power supply to J14 (VCC), then
connect the power-supply ground to J15 (GND).
6) Adjust the LOS threshold with R3 and R4.
7) The output amplitude is approximately 750mV.
DESIGNATION
QTY
DESCRIPTION
C1
1
33F
10% tantalum capacitor
C2
1
2.2F
10% tantalum capacitor
C3, C16
2
0.1F
10% ceramic capacitors
(0402)
C4C7
4
1000pF
10% ceramic capacitors
(0402)
C8C15, C17
9
0.01F
10% ceramic capacitors
(0402)
R1, R2
2
4.75k
1% resistors (0402)
R3
1
20k
potentiometer
R4
1
2k
potentiometer
L1
1
56nH inductor
Coilcraft 0805CS-560XKBC
U1
1
MAX3272EGP 20-QFN*
J1J8
8
SMA connectors, edge mount
(round contact)
J9, J10, J11
3
1
3-pin headers (0.1in centers)
J12, J13
2
1
2-pin headers (0.1in centers)
J14, J15, TP1,
TP2
4
Test points
None
1
M AX 3272 eval uati on ci r cui t b oar d ,
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None
1
MAX3272 data sheet
*Note: U1 has an exposed pad that requires that it be solder
attached to the circuit board to ensure proper functionality of
the part.
Component List
PART
TEMP RANGE
IC PACKAGE
MAX3272EVKIT
-40
C to +85C
20 QFN
Ordering Information
SUPPLIER
PHONE
FAX
AVX
843-448-9411
843-448-1943
Coilcraft
847-639-6400
847-639-1469
Murata
814-237-1431
814-238-0490
Venkel
800-950-8365
512-794-0087
Component Suppliers
Note: Please indicate that you are using the MAX3272 when
ordering from these suppliers.
Evaluates: MAX3272
Detailed Description
LOS Threshold Adjustment
Potentiometers R3 and R4 program the LOS assert
threshold. Refer to the MAX3272 data sheet for details
on setting the threshold.
Setting the Offset Correction Capacitor
Jumper J10 sets the offset correction loop capacitor.
Short pins 1 and 2 to set CAZ = 0.1F; short pins 2 and
3 to disable the offset correction loop. Leave J10
unconnected for a higher cutoff frequency. Refer to the
MAX3272 data sheet for details.
Setting the Output Polarity
Jumper J9 sets the output polarity. Short pins 1 (VCC)
and 2 for no signal inversion, or short pins 2 and 3
(GND) for an inversion in output polarity.
Setting the Squelch Function
Jumper J11 controls the squelch function. To enable
squelch, short pins 1 (VCC) and 2. To disable, short
pins 2 and 3 (GND) or leave unconnected.
Setting the Output Current
Jumper J13 sets the output current level. For 16mA
CML output current, leave this jumper open. For
approximately 20mA, short the jumper.
Setting the LOS Capacitor
Jumper J12 sets the LOS time constant capacitor. To
connect a 0.01F capacitor, short the jumper. For a short-
er time constant (about 2s), leave the jumper open.
LOS Test Point
Test point 1 is used to probe the LOS voltage. This pin
should indicate high (
2.4V) when loss-of-signal is
detected, and indicate low (
0.4V) in normal operation.
L
LO
OS
S Test Point
Test point 2 is used to probe the LOS voltage. This pin
should indicate low (
0.4V) when loss-of-signal is detect-
ed, and indicate high (
2.4V) in normal operation.
MAX3272 Evaluation Kit
2
_______________________________________________________________________________________
Evaluates: MAX3272
MAX3272 Evaluation Kit
_______________________________________________________________________________________
3
MAX3272
C1
33
F
C2
2.2
F
C3
0.1
F
VCC
GND
J14
J15
L1
56nH
V
CC
C8
0.01
F
J5
C12
0.01
F
J1
C9
0.01
F
J6
IN+
IN-
C11
0.01
F
J7
C10
0.01
F
J8
OUT+
OUT-
R3
20k
R4
2k
J13
LEVEL
V
CC
C6
1000pF
V
CC
C7
1000pF
C4
1000pF
V
CC
V
CC
CAZ
J10
C16
0.1
F
OUTPOL
J9
C5
1000pF
C17
0.01
F
V
CC
CLOS
J12
V
CC
J11
SQUELCH
V
CC
R1
4.75k
R2
4.75k
TP1
TP2
C14
0.01
F
J3
C13
0.01
F
J2
C15
0.01
F
J4
U1
GND
V
CC
CAZ1
CAZ2
GND OUTPOL
IN+
IN-
GND
TH
V
CC
OUT+
OUT-
V
CC
LEVEL
V
CC
CLOS SQUELCH LOS
LOS
Figure 1. MAX3272 EV Kit Schematic
Evaluates: MAX3272
MAX3272 Evaluation Kit
4
_______________________________________________________________________________________
1.45in, 36.8mm
2.7in, 68.6mm
Figure 2. MAX3272 EV Kit Component Placement Guide--Component Side
Evaluates: MAX3272
MAX3272 Evaluation Kit
_______________________________________________________________________________________
5
2.7in, 68.6mm
1.45in, 36.8mm
Figure 3. MAX3272 EV Kit PC Board Layout--Component Side
1.45in, 36.8mm
2.7in, 68.6mm
Figure 4. MAX3272 EV Kit PC Board Layout--Solder Side
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