TMDS141 Datasheet, PDF (1/28 Pages) Texas Instruments – HDMI HIDER

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HDMI HIDER
TMDS141
SLLS737B – JUNE 2006 – REVISED APRIL 2007
FEATURES
• Supports 2.25 Gbps Signaling Rate for 480i/p,
720i/p, and 1080i/p Resolution to 12-Bit Color
Depth
• Compatible with HDMI 1.3a
• Integrated Receiver Termination
• 8-dB Equalizer Compensates Losses from 5-m
or Longer HDMI Cables
• Selectable Output De-Emphasis Supports 1-m
HDMI Transmission
• I²C Repeater Isolates Bus Capacitance at Both
Ends
• High Impedance Outputs When Disabled
• TMDS Inputs HBM ESD Protection Exceeds 6
kV
• 3.3-V Supply Operation
• 40-Pin QFN Package (RHA)
• ROHS Compatible and 260°C Reflow Rated
APPLICATIONS
• Digital TV
• DVD Player
• Set-Top-Box
• Audio Video Receiver
• Digital Projector
• DVI or HDMI cable
DESCRIPTION
The TMDS141 HDMI hider is designed to accommodate a 1-m HDMI cable between a HDMI connector and a
receiver. The internal cable causes signal distortion to high-speed TMDS signals, as well as increasing
capacitance to the DDC channel. Each TMDS141 contains four TMDS repeaters to transmit digital content with
signaling rates of up to 2.25-Gbps, and an I²C repeater to link extended display identification data (EDID)
reading and high-bandwidth digital content protection (HDCP) key exchange under I²C standard mode
operations.
The device includes four TMDS compliant differential receivers with 50-Ω termination resistors and 3.3-V
termination voltage integrated at each receiver input pin. External terminations are not required. A built-in
frequency response equalization circuit, 8 dB at 825 MHz, compensates inter-symbol interference (ISI) losses
from a 5-m or longer input cable link.
The device also includes four TMDS compliant differential drivers. A precision resistor is connected externally
from the VSADJ pin to ground for setting the differential output voltage to be compliant with the TMDS standard.
A selectable de-emphasis circuit is available via the PRE input to drive long PCB traces or cables. When PRE is
high, the 3.5-dB high frequency gain offsets the losses due to the FR4 trace. PRE can be left open or kept low
when the de-emphasis function is not desired.
TYPICAL APPLICATION
Digital TV
Interface
Unit
Audiovisual
Processing
Unit
HDMI
Rx
TMDS
141
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2006–2007, Texas Instruments Incorporated