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Reference Design:
HFRD-34.0
Rev. 3; 05/08
REFERENCE DESIGN
4 x 4 DVI KVM Switch
Maxim Integrated Products
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4 x 4 DVI™ KVM Switch 3 Overview 1 Table of Contents 2. Features....................................................... 2 High-Frequency Reference Design (HFRD)-34.0 3. Overview .................................................... 2 is a fully buffered 4 x 4 DVI KVM switch. The 4. Application Diagrams................................. 3 design switches high-resolution DVI video (up to 5. Functional Diagrams................................... 4 1920 x 1200 resolution), analog audio, and
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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 2 USER 1
SHARED Figure 1. Typical application. DVI KVM SWITCH - App2 (4-Person Work Station) USER 1 USER 2 USER 3 USER 4
SHARED Figure 2. Typical application. Reference Design HFRD-34.0 (Rev.3, 05/08) Maxim Integrated Prod
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USB USB DVI In4 In3 In4 Audio Out4 USB HUB4 DVI KVM SWITCH - App3 (Single User Work Station) USER 1
SHARED Figure 3. Typical application. 5 Functional Diagrams HFRD-34.0 Top-Level Functional Diagram DVI In2 DVI Out1 DVI Out2 DVI Out3 DVI Out4 DVI In3 Video Section MAX3845 MAX4814 MAX3814 Audio MAX3208 Audio In3 In2 Audio Audio Audio Section In4 In1 USB Section MAX4550 Power USB2512 MAX9723 MAX1953 USB2513 MAX9728 MAX1563 MAX4906 MAX1853 MAX3207 Controller ATMEGA168
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Video-Section Functional 2 I C Diagram 5 MAX4814 5 x2 5 5 Low-Speed Video Signals High-Speed Video Signals 8 MAX3208 MAX3208 DVI Out1 DVI In1 MAX3814 x2 x2 8 MAX3208 MAX3208 DVI Out2 DVI In2 MAX3814 x2 x2 MAX3845 x2 8 MAX3208 MAX3208 MAX3814 DVI Out3 DVI In3 x2 x2 8 MAX3208 MAX3208 DVI Out4 DVI In4 MAX3814 x2 x2 Equalizers ESD Switch/MUX ESD Figure 5. Video-section functional diagram. Audio-Section Functional 2 Diagram I C Audio MAX9723 Audio In1 Out1 Headphone Driver 2 TVS MAX9723 Audio TVS
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USB-Section Functional 2 I C Diagram 2 4 USB HUB 1 USB 1 MAX3207 USB2512 MAX3208 2 - Port 2 4 USB HUB 2 USB 2 MAX3207 USB2512 MAX3208 2 - Port MAX4906 x8 2 4 USB HUB 3 MAX3207 USB 3 USB2512 MAX3208 2 - Port 2 4 USB HUB 4 MAX3207 USB2513 MAX3208 USB 4 2 - Port HUB Switches ESD ESD Controllers Data Power 2 MAX1558 2 MOSFETs x12 MAX1558 2 MAX1558 Power 2 Switches Main Supply MAX1558 Overcurrent Protection Figure 7. USB-section functional diagram. Reference Design HFRD-34.0 (Rev.3, 05/08) Ma
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6 IC Summary digital video equalizers, power-management A summary of the ICs used in this reference products, and audio drivers. For additional design is provided below, along with links to information about other Maxim products for this additional information for each device. and many other applications, please visit: www.maxim-ic.com. HFRD-34.0 demonstrates the operation of a small sample of Maxim’s digital and analog switches, Video Section Components Part Number Functional Desc
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USB Section Components Part Number Functional Description The MAX4906F analog multiplexer combines the low on-capacitance (C ) and low on- ON resistance (R ) necessary for high-performance switching applications. This device is ON designed for USB 2.0 Hi-Speed applications at 480Mbps. The MAX4906F also handles all the requirements for USB low- and full-speed signaling. MAX4906F Additional information: www.maxim-ic.com/MAX4906F SMSC’s USB251x is a family of versatile, cost-effe
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Audio Section Components Part Number Functional Description The MAX4550 serial-interface, programmable, dual 4x2 audio/video crosspoint switch is ideal for multimedia applications. It contains two identical crosspoint switch arrays, each with four inputs and two outputs. To improve off-isolation, the additional crosspoint inputs, SA and SB, can be used as shunts. The output is selectively programmable for clickless or regular mode operation. A set of internal resistive voltage-dividers s
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Control, Power Management, and Miscellaneous Components Part Number Functional Description The ATMega48 is a low-power CMOS 8-bit microcontroller based on the AVR enhanced RISC architecture. By executing instructions in a single clock cycle, the ATMega48 achieves throughputs approaching 1 MIPS per MHz, allowing the system designer to optimize power consumption versus processing speed. The ATMega48 features a multiple-input 10-bit ADC, an 8-bit and a 16-bit timer with two ATMEGA48 PWM o
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MAX1853 The MAX1853 monolithic, CMOS charge-pump voltage inverter in the ultra-small SC70 package features a low 15Ω output resistance, which permits loads up to 30mA with maximum efficiency. The MAX1853 is available with an operating frequency of 200kHz, allowing optimization of supply current or external component size. Small external components and micropower shutdown mode make this device ideal for both battery- powered and board-level voltage conversion applications. Additional
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The MAX3420E contains the digital logic and analog circuitry necessary to implement a full- speed USB peripheral compliant to USB specification rev 2.0. A built-in full-speed transceiver features ±15kV ESD protection and programmable USB connect and disconnect. An internal serial-interface engine (SIE) handles low-level USB protocol details such as error checking and bus retries. The MAX3420E operates using a register set accessed by an SPI™ MAX3420 interface that operates up to 26
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Sets the default configuration for the reference design CM 3 Default (Audio/Video/USB In1 to Audio/Video/USB Out1; Audio/Video/USB In2 to Audio/Video/USB Out2, etc.) CM 4 Demo Mode Puts the reference design into a demonstration mode. When in this mode, the controller will loop through the default and saved configurations at a preset time interval. This operation allows for automatic switching of the DVI and audio signals. Please note: The USB configuration is not switched in demo mode (o
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The current volume selection is highlighted. ACM 2 HP2 Volume Allows the user to adjust headphone 2 output volume (1through 7). The current volume selection is highlighted. ACM 3 Main Menu Return to Main Menu Allows the user to adjust DVI Out 1 preemphasis level between 0dB, ADVM 1 DVI1 Pre-Emph 3dB, and 6dB. The preemphasis can be increased to improve signal integrity when using long cables between HFRD-34.0 and the monitor. Allows the user to adjust DVI Out 2 preemphasis level betwee
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these features and configurations are set through the C firmware. 8 Schematics, Component List, and Layout Drawings 3. The USB HUB reset connection for the four HUBs (pin 26 of USB2512 and The full schematics, component list, and PCB USB2513 devices) are tied together on the layout drawings are available to download in PDF current version of the reference design. format at: Splitting these connections to have individual control will improve the http://www.maxim- overall USB swit
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compatibility of the reference design with 2. 0.5oz copper foil before platting. a wider variety of DVI video cards. 3. For USB signal-transmission lines: 10mil W, 8mil S -> 90Ω Ω Ω Ω Differential 4. For DVI signal-transmission lines: 8mil W, 8mil S -> 100Ω Ω Ω Ω Differential 11 Evaluation/Use Notes Table 2. HFRD-34.0 Layer Profile This reference design aids designers and is not Dielectric intended to replace the entire design process. The Thickness Copper Layer designer shoul
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1312 Board Dimensions Figure 8. HFRD-34.0 Board dimensions (not to scale). Reference Design HFRD-34.0 (Rev.3, 05/08) Maxim Integrated Products Page 17 of 18
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DVI is a trademark of Digital Display Working Group (DDWG). FireWire is a registered trademark of Apple Computer, Inc. HDMI is a trademark of HDMI Licensing, LLC. InfiniBand is a registered trademark of InfiniBand Trade Association. MultiTRAK is a trademark of Standard Microsystems Corporation. PCI Express is a registered trademark of PCI-SIG Corp. SMBus is a trademark of Intel Corporation. SPI is a trademark of Motorola, Inc. TMDS is a registered trademark of Silicon Image, Inc.
