SN65LVDS304 Datasheet, PDF (31/38 Pages) Texas Instruments – PROGRAMMABLE 27-BIT PARALLEL-TO-SERIAL RECEIVER

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SN65LVDS304
SLLS764 – SEPTEMBER 2006
APPLICATION INFORMATION (continued)
DUAL LCD-DISPLAY APPLICATION
The example in Figure 34 shows a possible application setup driving two video-mode displays from one
application processor. The data rate of 330 Mbps at a pixel clock rate of 5.5 MHz corresponds to a 320 × 240
QVGA resolution at 60-Hz refresh rate and 10% blanking overhead.
Application
Processor
(e.g. OMAP)
Pixel CLK
D[5:0]
D[11:6]
D[17:12]
HS, VS, DE
5.5 MHz
18 + 3
2 ´ 0.1 mF
2 ´ 0.01 mF
GND
2.7 V
1.8 V
GND
PCLK
R[5:0]
G[5:0]
B[5:0]
HS, VS, DE
CLK+
CLK–
D0+
D0–
SN65LVDS303
FPC
GND
2.7 V
1.8 V
GND
2 ´ 0.1 mF
2 ´ 0.01 mF
5.5 MHz
330 Mbps
CLK+
CLK–
D0+
D0–
PCLK
R[5:0]
G[5:0]
B[5:0]
HS, VS, DE
SN65LVDS304
Display Driver 1
21
PCLK
EN
SIN
SOUT
SCLK
Display Driver 2
1.8 V
1.8 V
PCLK
EN
SIN
SOUT
SCLK
Figure 34. Example Dual-QVGA Display Application
B0179-01
TYPICAL APPLICATION FREQUENCIES
The SN65LVDS304 supports pixel clock frequencies from 4 MHz to 30 MHz over 1 or 2 data pairs. Table 12
provides a few typical display resolution examples and shows the number of data pairs necessary to connect the
SN65LVDS304 with the display. The blanking overhead is assumed to be 20%. Often, blanking overhead is
smaller, resulting in a lower data rate. Furthermore, the examples in the table assumes a display frame refresh
rate of 60 Hz. The actual refresh rate may differ, depending on the application-processor clock implementation.
Display Screen
Resolution
176 × 220 (QCIF+)
240 × 320 (QVGA)
640 × 200
352 × 416 (CIF+)
352 × 440
320 × 480 (HVGA)
800 × 250
640x320
640 × 480 (VGA)
1024 × 320
854 × 480 (WVGA)
Table 12. Typical Application Data Rates and Serial Lane Usage
Visible Pixel
Count
38,720
76,800
128,000
146,432
154,880
153,600
200,000
204,800
307,200
327,680
409,920
Blanking
Overhead
20%
20%
20%
20%
20%
20%
20%
20%
20%
20%
20%
Display
Refresh Rate
90 Hz
60 Hz
60 Hz
60 Hz
60 Hz
60 Hz
60 Hz
60 Hz
60 Hz
60 Hz
60 Hz
Pixel Clock Frequency
[MHz]
4.2 MHz
5.5 MHz
9.2 MHz
10.5 MHz
11.2 MHz
11.1 MHz
14.4 MHz
14.7 MHz
22.1 MHz
23.6 MHz
29.5 MHz
Serial Data Rate Per Pair
1-ChM
2-ChM
125 Mbps
166 Mbps
276 Mbps
138 Mbps
316 Mbps
158 Mbps
335 Mbps
167 Mbps
332 Mbps
166 Mbps
432 Mbps
216 Mbps
442 Mbps
221 Mbps
332 Mbps
354 Mbps
443 Mbps
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