MAX7474EVKIT+ Maxim Integrated Products, MAX7474EVKIT+ Datasheet - Page 2

• Manufacturer Part Number: MAX7474EVKIT+
• Description: KIT EVAL FOR MAX7474
• Manufacturer: Maxim Integrated Products

Specifications of MAX7474EVKIT+

• Main Purpose: Video, Video Decoder
• Utilized Ic / Part: MAX7474
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Secondary Attributes: -
• Embedded: -
• Primary Attributes: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

MAX7474 Evaluation Kit
Before beginning, the following equipment is needed:
• 5V, > 100mA DC power supply
• Video signal generator (e.g., Tektronix TG-700 or
• Video measurement equipment (e.g., Tektronix VM-
• Active differential cable driver
The MAX7474 EV kit is fully assembled and tested.
Follow the steps below to verify board operation.
Caution: Do not turn on the power supply until all
connections are completed.
1) Install a shunt across pins 2-3 of jumper JU1 and a
2) Install a shunt across pins 1-2 of jumper JU3
3) Verify that no shunt is installed on jumper JU4 (AC-
4) Connect the differential video input signal to the
5) Connect the VOUT BNC connector on the EV kit to
6) Connect the power-supply ground to the GND pad
7) Connect the 5V DC power supply to the VCC pad
8) Set the video signal generator for the desired video
9) Turn on the power supply and enable the video
10) Analyze the video output signal with the video
The MAX7474 EV kit is designed to evaluate the
MAX7474 in a 16-pin SSOP package. The MAX7474 is
an adaptive equalizer for video over UTP cable. The EV
kit circuit is designed on a 2-layer, 1oz copper PCB
and all components are installed on the top layer. The
MAX7474 EV kit operates from a 5V DC power supply
that can deliver at least 100mA of current.
2
Detailed Description of Hardware
equivalent)
700T or equivalent)
_______________________________________________________________________________________
shunt across pins 1-2 of jumper JU2 (for ≥ 225m
manual cable length equalization).
(back-porch DC level set by R4).
coupled video output).
VIN connector or the V_INP and VINN test points.
the input of the video measurement equipment.
on the EV kit.
on the EV kit.
input signal.
signal generator output.
measurement equipment.
Required Equipment
Quick Start
Procedure
The MAX7474 EV kit accepts differential video input
signals and provides a single-ended output nominal
1V
ed to the VIN RJ-45 connector (pins 7-8), or the V_INP
and V_INN test points on the MAX7474 EV kit. See
Table 4 in the Jumper Selection section for the VIN RJ-
45 connector pin configuration.
The MAX7474 EV kit automatically equalizes the base-
band composite video signal from a low-cost UTP cable,
and provides an option to set the fixed equalization
level to compensate for different input cable lengths up
to 300m in the absence of a burst signal. The MAX7474
fixed equalization level is jumper selectable. See the
Jumper Selection section for more details.
The MAX7474 EV kit provides an option to set the
back-porch DC level for the video output signal. The
video output’s back-porch DC level can be set by an
on-board voltage reference (U2) or by an external volt-
age source connected to the BP_LVL BNC connector.
U2 is a MAX6037 voltage reference that provides an
on-board 0 to 2.5V voltage reference for the back-
porch DC level. Potentiometer R4 is used to set the
back-porch DC level. The back-porch DC level is set to
1.4V at the factory. See the Jumper Selection section
for more detail.
The MAX7474 EV kit provides an option to set the fixed
equalization level for the video input signal to compen-
sate for different cable lengths in the absence of burst.
Jumpers JU1 and JU2 set the fixed equalization level
pins (FEQ0 and FEQ1) of the MAX7474 IC. When using
cable lengths greater than 75m, set the fixed equaliza-
tion level according to Table 1.
Table 1. JU1 and JU2 Jumper Selection
(FEQ0, FEQ1)
* Default position.
1-2* (high)
1-2 (high)
2-3 (low)
2-3 (low)
(FEQ1)
P-P
SHUNT POSITION
JU2
. A differential video input signal can be connect-
1-2 (high)
2-3* (low)
1-2 (high)
2-3 (low)
(FEQ0)
Fixed Equalization Level (FEQ0, FEQ1)
JU1
EQUALIZATION
LEVEL (dB)
+10.5
+10.5
+4.5
0
Jumper Selection
COMPENSATED
LENGTH (m)
75 to 225
CABLE
0 to 75
≥ 225
≥ 225