DS90UB925Q-Q1 Datasheet, PDF (23/51 Pages) Texas Instruments – 5 to 85 MHz 24-Bit Color FPD-Link III Serializer With Bidirectional Control Channel

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DS90UB925Q-Q1
SNLS407D – APRIL 2012 – REVISED OCTOBER 2014
Device Functional Modes (continued)
Table 4. Configuration Select (MODE_SEL)
#
IDEAL
RATIO
V_R4/V_DD33
IdeAl V_R4
(V)
SUGGESTED
RESISTOR R3
kΩ (1% tol)
SUGGESTED
RESISTOR R4
kΩ (1% tol)
LFMODE
REPEATER
BACKWARD
COMPATIBL
E
I2S Channel
B
(18–bit
Mode)
1
0
0
Open
40.2 or Any
L
L
L
L
2
0.164
0.541
255
49.9
L
H
L
L
3
0.221
0.729
243
69.8
L
H
L
H
4
0.285
0.941
237
95.3
H
L
L
L
5
0.359
1.185
196
110
H
L
L
H
6
0.453
1.495
169
140
H
H
L
L
7
0.539
1.779
137
158
H
H
L
H
8
0.728
2.402
90.9
243
H
L
H^*
L
LFMODE:
L = frequency range is 15 – 85 MHz (Default)
H = frequency range is 5 – <15 MHz
Repeater:
L = Repeater OFF (Default)
H = Repeater ON
Backward Compatible:
L = Backward Compatible is OFF (Default)
H = Backward Compatible is ON; DES = DS90UR906Q or DS90UR916Q or DS90UR908Q
– frequency range = 15 - 65 MHz when LFMODE = 0
– frequency range = 5 - <15 MHz when LFMODE = 1
I2S Channel B:
L = I2S Channel B is OFF, Normal 24-bit RGB Mode (Default)
H = I2S Channel B is ON, 18-bit RGB Mode with I2S_DB Enabled. Note: use of GPIO(s) on unused inputs must be enabled by register.
7.4.2 Repeater Application
The DS90UB925Q-Q1 and DS90UB926Q-Q1 can be configured to extend data transmission over multiple links
to multiple display devices. Setting the devices into repeater mode provides a mechanism for transmitting to all
receivers in the system.
7.4.2.1 Repeater Configuration
In the repeater application, in this document, the DS90UB925Q-Q1 is referred to as the Transmitter or transmit
port (TX), and the DS90UB926Q-Q1 is referred to as the Receiver (RX). Figure 16 shows the maximum
configuration supported for Repeater implementations using the DS90UB925Q-Q1 (TX) and DS90UB926Q-Q1
(RX). Two levels of Repeaters are supported with a maximum of three Transmitters per Receiver.
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