Maxim HFRD-34.0 User Manual
Reference Design:
HFRD-34.0
Rev. 3; 05/08
REFERENCE DESIGN
4 x 4 DVI KVM Switch
Maxim Integrated Products
4 x 4 DVI™ KVM Switch
1 Table of Contents
2. Features....................................................... 2
3. Overview .................................................... 2
4. Application Diagrams................................. 3
5. Functional Diagrams...................................4
6. IC Summary................................................ 7
7. Navigation Menu........................................ 12
8. Schematics, Component List and
Layout Drawings........................................15
9. Gerber Files and Firmware......................... 15
10. Design Notes ............................................ 15
11. Evaluation/Use Notes...............................16
12. Layer Profile............................................. 16
13. Board Dimensions....................................17
2 Features
• 4 x 4 video, audio, and USB switch
• Fully buffered signals for extended reach
• Supports DVI resolutions up to 1920 x
1200 per port
• Simple navigation switch/LCD control
• DVI data-input equalization and
adjustable data-output preemphasis
• Schematics and Bill of Materials provided
• Firmware and Gerber files available
3 Overview
High-Frequency Reference Design (HFRD)-34.0
is a fully buffered 4 x 4 DVI KVM switch. The
design switches high-resolution DVI video (up to
1920 x 1200 resolution), analog audio, and USB
signals from one to four inputs to one to four
outputs. HFRD-34.0 supports both video and
audio fanout operation (one source to multiple
outputs). The reference design also provides 1:2
hubs on each USB port for keyboard and mouse
connections of up to four different users.
All signals are fully buffered, allowing extended
connection distances. Additionally, equalization is
provided on all DVI data input signals and
adjustable preemphasis on all DVI data outputs.
All control and configuration selections are made
through a simple navigational switch and LCD
display.
This document provides an overview of the design
and operation of HFRD-34.0.
Reference Design HFRD-34.0 (Rev.3, 05/08) Maxim Integrated Products
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4 Application Diagrams
HFRD-34.0 can be configured in a variety of application environments. Three possible applications are
shown in Figures 1 through 3 below.
DVI KVM SWITCH - App1
(2-Person Work Station)
USER 1
Figure 1. Typical application.
DVI KVM SWITCH - App2
(4-Person Work Station)
USER 2
SHARED
USER 1
Figure 2. Typical application.
Reference Design HFRD-34.0 (Rev.3, 05/08) Maxim Integrated Products
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USER 2 USER 3 USER 4
SHARED
DVI KVM SWITCH - App3
(Single User Work Station)
USER 1
Figure 3. Typical application.
SHARED
5 Functional Diagrams
HFRD-34.0
Top-Level Functional Diagram
1
n
I
I
V
D
B
S
U
2
n
I
B
S
U
1
n
I
Audio
In2
Audio
In1
Power
MAX1953
MAX1563
MAX1853
o
i
d
u
3
t
A
u
O
B
S
3
U
B
U
H
USB
HUB1
Out1
Audio
DVI Out1 DVI Out2 DVI Out3 DVI Out4DVI In2 DVI In3
Video Section
MAX3845
MAX4814
MAX3814
MAX3208
Audio Section
USB Section
USB2512
USB2513
MAX4906
MAX3207
LCD Display
Controller
ATMEGA168
NAV
Switch
MAX4550
MAX9723
MAX9728
Out2
Audio
USB
HUB2
D
V
I
I
n
4
U
S
B
I
n
3
U
S
B
I
n
4
Audio
In3
Audio
In4
A
u
d
O
i
o
u
t
4
U
S
H
B
U
B
4
Figure 4. HFRD-34.0 Top-level functional diagram.
Reference Design HFRD-34.0 (Rev.3, 05/08) Maxim Integrated Products
Page 4 of 18
Video-Section Functional
Diagram
5
5
5
5
Low-Speed Video Signals
High-Speed Video Signals
8
DVI In1
DVI In2
DVI In3
DVI In4
MAX3208
x2
8
MAX3208
x2
8
MAX3208
x2
8
MAX3208
x2
ESD
MAX3814
MAX3814
MAX3814
MAX3814
Equalizers
MAX4814
x2
MAX3845
x2
Switch/MUX
I2C
MAX3208
x2
MAX3208
x2
MAX3208
x2
MAX3208
x2
ESD
DVI Out1
DVI Out2
DVI Out3
DVI Out4
Figure 5. Video-section functional diagram.
Audio-Section Functional
Diagram
Audio
In1
2
Audio
In2
Audio
In3
Audio
In4
Figure 6. Audio-section functional diagram.
TVS
2
TVS
2
TVS
2
TVS
MAX4550
x2
With Click/Pop
Suppression
ESD
Switch
I2C
MAX9723
Headphone
Driver
MAX9728
Line Out
Driver
Audio Buffers
MAX9723
Headphone
Driver
MAX9728
Line Out
Driver
TVS
TVS
TVS
TVS
ESD
Audio
Out1
Audio
Out2
Audio
Out3
Audio
Out4
Reference Design HFRD-34.0 (Rev.3, 05/08) Maxim Integrated Products
Page 5 of 18
USB-Section Functional
Diagram
2
USB 1
MAX3207
I2C
USB2512
4
MAX3208
USB HUB 1
2 - Port
USB 2
MAX3207
MAX4906
2
2
USB 3
MAX3207
2
USB 4
MAX3207
ESD ESD
Switches
Data
Power
MOSFETs
x12
Power
Switches
Main Supply
Figure 7. USB-section functional diagram.
x8
USB2512
USB2512
USB2513
HUB
Controllers
MAX1558
MAX1558
MAX1558
MAX1558
Overcurrent
Protection
4
MAX3208
4
MAX3208
4
MAX3208
USB HUB 2
2 - Port
USB HUB 3
2 - Port
USB HUB 4
2 - Port
2
2
2
2
Reference Design HFRD-34.0 (Rev.3, 05/08) Maxim Integrated Products
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