DS90UR124-Q1 Datasheet, PDF (25/41 Pages) Texas Instruments – 5-MHz to 43-MHz DC-Balanced 24-Bit FPD-Link II Serializer and Deserializer Chipset

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9.2 Typical Applications
9.2.1 DS90UR241-Q1 Typical Application Connection
DS90UR124-Q1, DS90UR241-Q1
SNLS231O – SEPTEMBER 2006 – REVISED APRIL 2015
LVCMOS
Parallel
Interface
GPOs if used, or tie High (ON)
3.3V
Notes:
TPWDNB = System GPO
R2
DEN = High (ON)
TRFB = High (Rising edge)
RAOFF = Low (Default)
VODSEL = Low (500 mV)
PRE = Rpre
RES0 = Low
DS90UR241 (SER)
DIN0
DIN1
DIN2
DIN3
DIN4
DIN5
DIN6
DIN7
DIN8
DIN9
DIN10
DIN11
DIN12
DIN13
DIN14
DIN15
VDD
VDD
VDD
VDD
VDD
VDD
DIN16
DIN17
DIN18
DIN19
DIN20
DIN21
DIN22
DIN23
DOUT+
TCLK
TPWDNB
DEN
TRFB
PRE
VODSEL
RAOFF
RES0(3)
DOUT-
VSS
VSS
VSS
VSS
VSS
VSS
3.3V
C4
C1
C5
C2
C6
C3
C7
R1
C8
Serial
LVDS
Interface
C1 to C3 = 0.1 PF
C4 to C6 = 0.01 PF (optional)
C7 to C8 = 100 nF50WVDC, NPO or X7R
R1 = 100 :
R2 = Open (OFF)
or Rpre & 6 k: (ON) (cable specific)
Figure 22. DS90UR241 Connection Diagram
9.2.1.1 Design Requirements
Table 3. DS90UR241 Design Parameter
DESIGN PARAMETER
VDD
AC Coupling Capacitor for DOUT±
DOUT± External Termination
PCLK Frequency
EXAMPLE VALUE
3.3 V
100 nF
100 Ω
33 MHz
9.2.1.2 Detailed Design Procedure
Figure 22 shows a typical application of the DS90UR241 serializer for an 33-MHz 18-bit Color Display
Application. The DOUT± outputs must have a series external 0.1-μF AC-coupling capacitor and 100-Ω parallel
termination on the high-speed serial lines. The serializer does not have an internal termination. Bypass
capacitors are placed near the power supply pins. At a minimum, three 0.1-μF capacitors should be used for
local device bypassing. Additional capacitors may be needed as the number and values of the capacitors will
depend on meeting the power noise specification of the part. Ferrite beads may be needed on the VDDs for
effective noise suppression. The interface to the graphics source is with 3.3-V LVCMOS levels. An RC delay is
placed on the PDB signal to delay the enabling of the device until power is stable.
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