DS90UR907Q-Q1 Datasheet, PDF (16/35 Pages) Texas Instruments – 24-Bit Color FPD-Link to FPD-Link II Converter

DS90UR907Q-Q1
SNLS316G – SEPTEMBER 2009 – REVISED DECEMBER 2015
www.ti.com
RxCLKIN +/-
RxIN3 +/-
Previous cycle
RxIN2 +/-
Current cycle
B[7]
(bit 26)
B[6]
(bit 25)
G[7]
(bit 24)
G[6]
(bit 23)
R[7]
(bit 22)
DE
(bit 20)
VS
(bit 19)
HS
(bit 18)
B[5]
(bit 17)
B[4]
(bit 16)
B[3]
(bit 15)
R[6]
(bit 21)
B[2]
(bit 14)
RxIN1 +/-
B[1]
(bit 13)
B[0]
(bit 12)
G[5]
(bit 11)
G[4]
(bit 10)
G[3]
(bit 9)
G[2]
(bit 8)
G[1]
(bit 7)
RxIN0 +/-
G[0]
(bit 6)
R[5]
(bit 5)
R[4]
(bit 4)
R[3]
(bit 3)
R[2]
(bit 2)
R[1]
(bit 1)
R[0]
(bit 0)
Figure 17. 8–Bit FPD-Link Mapping: MSB's on Rxin3
7.3.5 EMI Reduction Features
7.3.5.1 Spread Spectrum Compatibility
The RxCLKIN of the FPD-Link input is capable of tracking spread spectrum clocking (SSC) from a host source.
The RxCLKIN will accept spread spectrum, tracking up to 35-kHz modulation and ±0.5, ±1 or ±2% deviations
(center spread). The maximum conditions for the RxCLKIN input are: a modulation frequency of 35 kHz and
amplitude deviations of ±2% (4% total).
7.3.6 Signal Quality Enhancers
7.3.6.1 VOD Select (VODSEL)
The DS90UR907Q differential output voltage may be increased by setting the VODSEL pin High. When VODSEL
is Low, the DC VOD is at the standard (default) level. When VODSEL is High, the DC VOD is increased in level.
The increased VOD is useful in extremely high noise environments and also on extra long cable length
applications. When using de-emphasis, TI recommends setting VODSEL = H to avoid excessive signal
attenuation especially with the larger de-emphasis settings. This feature may be controlled by the external pin or
by register.
INPUT
VODSEL
H
L
Table 2. Differential Output Voltage
VOD (mV)
±450
±300
EFFECT
VOD (mVp-p)
900
600
7.3.6.2 De-Emphasis (De-Emph)
The De-Emph pin controls the amount of de-emphasis beginning one full bit time after a logic transition that the
device drives. It is the signal conditioning function for use in compensating against cable transmission loss. This
pin should be left open for standard switching currents (no de-emphasis) or if controlled by register. De-emphasis
is selected by connecting a resistor on this pin to ground, with R value from 0.5 kΩ to 1 MΩ, or by register
setting. When using De-Emphasis, TI recommends setting VODSEL = H.
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