MAX4358ECE+D Maxim Integrated Products, MAX4358ECE+D Datasheet - Page 39

• Manufacturer Part Number: MAX4358ECE+D
• Description: IC VIDEO CROSSPOINT SWIT 144TQFP
• Manufacturer: Maxim Integrated Products

Specifications of MAX4358ECE+D

• Function: Video Crosspoint Switch
• Circuit: 1 x 32:16
• Voltage Supply Source: Single, Dual Supply
• Voltage - Supply, Single/dual (±): 5V, ± 3 V ~ 5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 144-TQFP, 144-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

with On-Screen Display Insertion and I/O Buffers
In addition to crosstalk, another key issue of concern is
isolation. Isolation is the rejection of undesirable feed-
through from input-to-output with the output disabled.
The MAX4358 achieves a -110dB isolation at 6MHz by
selecting the pinout configuration such that the inputs
and outputs are on opposite sides of the package.
Coupling through the power supply is a function of the
quality and location of the supply bypassing. Use
appropriate low-impedance components and locate
them as close as possible to the IC. Avoid routing the
inputs near the outputs.
The MAX4358 operates from a single +5V or dual ±3V
to ±5V supplies. For single-supply operation, connect
all V EE pins to ground and bypass all power-supply
pins with a 0.1µF capacitor to ground. For dual-supply
systems, bypass all supply pins to ground with 0.1µF
capacitors.
2.Maintain controlled-impedance traces. Design as
3.Minimize ground current interaction by using a good
Figure 10. Matrix Mode Programming
many of the PC board traces as possible to be 75Ω
transmission lines. This lowers the impedance of the
traces reducing a potential source of crosstalk. More
power will be dissipated due to the output buffer dri-
ving a lower impedance.
ground plane strategy.
32 x 16 Nonblocking Video Crosspoint Switch
CONTROLLER
HOST
______________________________________________________________________________________
Power-Supply Bypassing
CHIP ADDRESS = 0
DIN
SCLK
CE
MODE
UPDATE
MAX4358
DOUT
A3
A2
A1
A0
VIRTUAL SERIAL BUS (MODE 0: INDIVIDUAL OUTPUT ADDRESS MODE)
CHIP ADDRESS = 1
DIN
SCLK
CE
MODE
UPDATE
MAX4358
DOUT
T
supplies down to ±3V or a single supply of +5V.
Operating at the minimum supply voltages reduces the
power dissipation by as much 40% to 50%. At ±5V, the
MAX4358 consumes 195mW (0.38mW/point).
The MAX4358 output buffers can be programmed to
either A V = +1V/V or +2V/V. The +1V/V configuration is
typically used when driving short lengths (less than
3cm), high impedance, "local" PC board traces. To
drive a cable or a 75Ω transmission line trace, program
the gain of the output buffer to +2V/V and place a 75Ω
resistor in series with the output. The series termination
resistor and the 75Ω load impedance act as a voltage
divider that divides the video signal in half. Set the gain
to +2V/V to transmit a standard 1V video signal down a
cable. The series 75Ω resistor is called the back-
match, reverse termination, or series termination. This
75Ω resistor reduces reflections and provides isolation,
increasing the output capacitive driving capability.
The MAX4358’s unique digital interface simplifies pro-
gramming multiple MAX4358 devices in an array.
Multiple devices are connected with DOUT of the first
he MAX4358 has been designed to operate with split
A3
A2
A1
A0
Driving a PC-Board Interconnect or Cable
V
DD
CHIP ADDRESS = 2
DIN
SCLK
CE
MODE
UPDATE
MAX4358
Power in Large Systems
DOUT
A3
A2
A1
A0
(A
Matrix Programming
V
= +1V/V or +2V/V)
V
DD
NEXT DEVICE
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