General Description
The MAX3274 evaluation kit (EV kit) simplifies evalua-
tion of the MAX3274 limiting amplifier. The EV kit allows
quick threshold level selections, provides appropriate
impedance matching circuitry, and includes calibration
circuits. The MAX3274 EV kit is fully assembled and
tested.
Features
o Test Points for Easy Monitoring of LOS and LOS
o Separate Pullup Supply (VLOS) Pin for LOS and
LOS Outputs
o Jumpers Allow Quick Selection for Loss-of-Signal
Threshold Level, Squelch, and Bandwidth
Evaluates: MAX3274
MAX3274 Evaluation Kit
________________________________________________________________ Maxim Integrated Products
1
DESIGNATION
QTY
DESCRIPTION
C1, C4
2
33µF
±10%, 10V min tantalum
capacitors (case B)
C2, C5C15
12
0.1µF
±10%, 10V min ceramic
capacitors (0402)
C3
1
0.1µF
±10%, 10V min ceramic
capacitor (0603)
J1J8
8
SMA connectors,
edge mount, tab centers
EFJohnson 142-0701-851
JU1JU4,
JU6, JU7
6
2-pin headers, 0.1in centers
JU1JU4,
JU6, JU7
6
Shunts
L1
1
4.7µH inductor
Coilcraft 1008CT-040XKBC (1008)
R1, R2, R6, R8
4
4.7k
±5% resistors (0402)
R3
1
1.5k
±1% resistor (0402)
R4
1
681
±1% resistor (0402)
R5
2
401
±1% resistor (0402)
R9, R10
2
Open
TP1, TP2,
GND, VCC,
VLOS
5
Test points
Digi-Key 5000K-ND
U1
1
MAX3274UGE (MAX3274EVKIT)
None
1
MAX3274, rev B, EV kit circuit
board
None
1
MAX3274 data sheet
Component List
Ordering Information
19-2388; Rev 0; 4/02
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.
PART
TEMP RANGE
IC PACKAGE
MAX3274EVKIT
0°C to +85°C
16 QFN
SUPPLIER
PHONE
FAX
AVX
803-946-0690
803-626-3123
Coilcraft
847-639-6400
847-639-1469
Murata
770-436-1300
770-436-3030
Venkel
800-950-8365
512-794-0087
Component Suppliers
Evaluates: MAX3274
Quick Start
1) Connect OUT+ and OUT- to a 50
terminated
oscilloscope.
2) Connect IN+ and IN- to a 500mV
P-P
, 2.125Gbps
differential data stream.
3) Remove jumper JU6 to disable squelch.
4) Connect shunt at jumper JU7 to use VCC as the
pullup supply for LOS and LOS outputs.
5) Connect shunt at jumper JU4 for 2.125Gbps operation.
6) Connect a +3.3V power supply to the VCC pad,
and then connect the power-supply ground to the
GND pad.
7) Observe a limited signal at the output (~1.1V
P-P
dif-
ferential for the MAX3274).
Detailed Description
The MAX3274 dual-rate limiting amplifier is designed to
accept a differential signal from a 100
differential out-
put transimpedance preamplifier. In order for output
data to be valid, incoming data must be above the
threshold voltage set by placing a shunt at jumper JU1,
JU2, or JU3. LOS and LOS are open-collector outputs
and indicate whether the input data stream voltage is
below the threshold voltage. The EV kit supplies the
required pullup resistors for LOS and LOS. Placing a
shunt at jumper JU6 enables squelch and disables out-
put if incoming data voltage is below the threshold level.
The shunt can be removed from jumper JU7 if the user
wants to interface the LOS and LOS pins with a voltage
different from VCC. With a shunt at jumper JU4, the
input filter is disabled and the chip is ready to accept
data at 2.125Gbps. To evaluate the chip at 1.0625Gbps,
remove the shunt at jumper JU4.
Calibration Strip
The calibration strip can be used to calibrate out the
effects of the circuit board, such as connectors, in criti-
cal measurements such as deterministic jitter and
rise/fall times.
MAX3274 Evaluation Kit
2
_______________________________________________________________________________________
Table 1. Jumpers
NAME
FUNCTION
JU1, JU2, JU3 Select loss-of-signal threshold level
JU4
S elects i nput band wi d th, open for 1.0625Gb ps
and cl osed for 2.125Gb ps
JU6
Closed to enable squelch, opened to disable
squelch
JU7
When using an external pullup supply for LOS
and LOS other than VCC, remove jumper
Evaluates: MAX3274
MAX3274 Evaluation Kit
_______________________________________________________________________________________
3
U1
MAX3274
C1
33
µF
C4
33
µF
C2
0.1
µF
C5
0.1
µF
C6
0.1
µF
C3
0.1
µF
C7
0.1
µF
VCC
GND
L1
4.7
µH
JU7
VLOS
R1
4.7k
R2
4.7k
TP1
TP2
C8
0.1
µF
IN+
SMA
J1
C9
0.1
µF
IN-
SMA
J2
JU4
R8
4.7k
JU6
R6
4.7k
R5
401
JU3
R4
681
JU2
R3
1.5k
JU1
C11
0.1
µF
R10*
OUT-
SMA
J4
C10
0.1
µF
OUT+
SMA
J3
CALIBRATION STRIP
C13
0.1
µF
SMA
J6
C12
0.1
µF
SMA
J5
C15
0.1
µF
SMA
J8
C14
0.1
µF
SMA
J7
R9
OPEN
GND
IN+
IN-
V
CC
BWSEL
OUT+
OUT-
V
CC
TH
GND
LOS
LOS
TEST
GND
SQUELCH
V
CC
1
16
15
14
13
5
6
7
8
2
3
4
12
11
10
9
R10*- OPEN
NC
Figure 1. MAX3274 EV Kit Schematic
Evaluates: MAX3274
MAX3274 Evaluation Kit
4
_______________________________________________________________________________________
Figure 2. MAX3274 EV Kit Component Placement Guide--Component Side
Evaluates: MAX3274
MAX3274 Evaluation Kit
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 5
© 2002 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
Figure 3. MAX3274 EV Kit PC Board Layout--Component Side
Figure 4. MAX3274 EV Kit PC Board Layout--Ground Plane
Figure 5. MAX3274 EV Kit PC Board Layout--Power Plane
Figure 6. MAX3274 EV Kit PC Board Layout--Solder Side
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