19-2681; Rev 0; 10/02
MAX3785 Evaluation Kit
General Description
The MAX3785 evaluation kit (EV kit) simplifies evalua-
tion of the MAX3785 6.25Gbps equalizer. The EV kit
enables testing of all device functions. SMA connectors
with 50鈩?controlled impedance to the MAX3785 are
provided for all input and output ports to facilitate con-
nection to high-speed test equipment.
Features
o
SMA Connectors for All High-Speed Inputs
and Outputs
o
Fully Assembled and Tested
o
Calibration Test Strip
Evaluates: MAX3785
Component Suppliers
SUPPLIER
AVX
Coilcraft
Murata
PHONE
843-444-2863
847-639-6400
415-964-6321
FAX
843-626-3123
847-639-1469
415-964-8165
PART
MAX3785EVKIT
Ordering Information
TEMP RANGE
0擄C to +85擄C
PIN-PACKAGE
6 UCSP
Note:
Please indicate that you are using the MAX3785 when
contacting these component suppliers.
Component List
DESIGNATION
C1
QTY
1
DESCRIPTION
33碌F
鹵10%
tantalum capacitor,
case B
AVX TAJB336M010R
0.1碌F 鹵10%, 10V ceramic capacitors
(0402)
Test points
Digi-Key 5000K-ND
SMA connectors, edge mount,
tab contacts
EFJohnson 142-0701-851
4.7碌H inductor
Coilcraft 1008CT-040XJBC
MAX3785UBL
MAX3785 evaluation circuit board,
rev A
MAX3785 data sheet
Quick Start
1) Connect a +1.8V power supply to J1 (V
CC
).
Connect the power supply ground to J2.
2) Connect DC-blocking capacitors or bias T networks
to IN+ and IN- inputs. Then connect a differential
signal from 400mV
P-P
to 1600mV
P-P
to the inputs
using 50鈩?cables. If not using DC-blocking capaci-
tors, then the high level for each input signal must
be V
CC
.
Warning:
The SMA connectors are directly con-
nected to the chip鈥檚 inputs and outputs. To avoid
damage to laboratory equipment or device, always
use DC-blocking capacitors or bias T networks.
3) Connect DC-blocking capacitors or bias T networks
to OUT+ and OUT- outputs. Then connect signals
from the DC-blocking capacitors to an oscilloscope
with 50鈩?input terminations.
4) At the signal source, start with a short, simple pat-
tern such as a 2
7
- 1 PRBS. The data rate can be
1Gbps to 6.4Gbps.
5)
Evaluation:
After the EV kit has been initially
checked out, evaluation can begin with a FR4 PC
board. Start with a board length of 20in and
progress to longer lengths. For data rates of
3.2Gbps and slower, the part equalizes board
lengths up to 40in. For data rates of 6.4Gbps and
slower, the part equalizes board lengths up to 30in.
When connecting the equalizer with the board, keep
the cables from the board to the equalizer as short
as possible.
1
C2, C3
J1, J2
2
2
J3鈥揓8
6
L1
U1
None
None
1
1
1
1
________________________________________________________________
Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.
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