DS90UH927Q-Q1 Datasheet, PDF (52/68 Pages) Texas Instruments – 5-MHz to 85-MHz 24-Bit Color FPD-Link III Serializer with HDCP

DS90UH927Q-Q1
SNLS433C – NOVEMBER 2012 – REVISED JANUARY 2015
8 Application and Implementation
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NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
The DS90UH927Q-Q1, in conjunction with the DS90UH928Q-Q1 or DS90UH926Q-Q1, is intended for interface
between a HDCP compliant host (graphics processor) and a display supporting 24-bit color depth (RGB888) and
high definition (720p) digital video format. It can receive an 8-bit RGB stream with a pixel clock rate up to 85 MHz
together with three control bits (VS, HS and DE) and four I²S audio streams. The included HDCP 1.3 compliant
cipher block allows the authentication of the HDCP Deserializer, which decrypts both video and audio contents.
The HDCP keys are pre-loaded by TI into Non-Volatile Memory (NVM) for maximum security.
8.2 Typical Application
Figure 29 shows a typical application of the DS90UH927Q-Q1 serializer for an 85 MHz 24-bit Color Display
Application. The 5 LVDS input pairs require external 100Ω terminations. The CML outputs must have an external
0.1-µF AC coupling capacitor on the high speed serial lines. The serializer has internal CML termination on its
high speed outputs.
Bypass capacitors should be placed near the power supply pins. At a minimum, four (4) 4.7-µF capacitors should
be used for local device bypassing. Ferrite beads are placed on the two sets of supply pins (VDD33 and VDDIO)
for effective noise suppression. The interface to the graphics source is LVDS. The VDDIO pins may be
connected to 3.3 V or 1.8 V. A capacitor and resistor are placed on the PDB pin to delay the enabling of the
device until power is stable.
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