19-2681; Rev 0; 10/02
MAX3785 Evaluation Kit
General Description
Features
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 controlled impedance to the MAX3785 are
provided for all input and output ports to facilitate con-
nection to high-speed test equipment.
ꢀ SMA Connectors for All High-Speed Inputs
and Outputs
ꢀ Fully Assembled and Tested
ꢀ Calibration Test Strip
Ordering Information
Component Suppliers
SUPPLIER
AVX
PHONE
FAX
PART
TEMP RANGE
PIN-PACKAGE
843-444-2863
847-639-6400
415-964-6321
843-626-3123
847-639-1469
415-964-8165
MAX3785EVKIT
0°C to +85°C
6 UCSP
Coilcraft
Murata
Note: Please indicate that you are using the MAX3785 when
contacting these component suppliers.
Quick Start
Component List
1) Connect a +1.8V power supply to J1 (V ).
CC
DESIGNATION QTY
DESCRIPTION
Connect the power supply ground to J2.
33µF 10% tantalum capacitor,
case B
AVX TAJB336M010R
2) Connect DC-blocking capacitors or bias T networks
to IN+ and IN- inputs. Then connect a differential
C1
1
signal from 400mV
to 1600mV
to the inputs
P-P
P-P
using 50 cables. If not using DC-blocking capaci-
tors, then the high level for each input signal must
0.1µF 10%, 10V ceramic capacitors
(0402)
C2, C3
J1, J2
2
2
be V
.
CC
Test points
Digi-Key 5000K-ND
Warning: The SMA connectors are directly con-
nected to the chip’s inputs and outputs. To avoid
damage to laboratory equipment or device, always
use DC-blocking capacitors or bias T networks.
SMA connectors, edge mount,
tab contacts
J3–J8
6
EFJohnson 142-0701-851
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 input terminations.
4.7µH inductor
Coilcraft 1008CT-040XJBC
L1
1
1
1
1
U1
MAX3785UBL
4) At the signal source, start with a short, simple pat-
tern such as a 27 - 1 PRBS. The data rate can be
1Gbps to 6.4Gbps.
MAX3785 evaluation circuit board,
rev A
None
None
MAX3785 data sheet
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.
________________________________________________________________ Maxim Integrated Products
1
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.