PD16780A_15 Datasheet, PDF (7/18 Pages) Renesas Technology Corp – 300 OUTPUT TFT-LCD SOURCE DRIVER

µ PD16780A
Cautions 1. To prevent latch-up-breakdown, the power should be turned on in order VDD1, Logic input VDD2,
video signal input. It should be turned off in the opposite order. This relationship should be
followed during transition periods as well.
2. The sampling of the video signal of this IC is only the simultaneous 3 output sampling of C1, C2,
C3. Incidentally, it is designing abound of the input of the video signal in 10 MHz MAX.
If a video signal with a higher frequency is input, the data may not be correctly displayed.
3. Recommend a bypass capacitor of about 0.1 µF with good high-frequency characteristics
between VDD1 and VSS1, and VDD2 and VSS2 in each driver IC.
4. If noise is superimposed on the start pulse pin, the data may not be displayed. For this reason,
be sure to input CX signal during the vertical blanking period.
5. If the start pulse width is extended by half the clock or longer, the sampling start timing SHP1
does not change from normal timing; therefore, the sampling operation is performed normally.
5. FUNCTION DESCRIPTION
5.1 Switching of Sample & Hold Circuits
Two sample-and-hold circuits are switched.
CX
Output
L Sample & Hold Circuit 1 (S&H1)
H Sample & Hold Circuit 2 (S&H2)
Sample & hold operation
Sample & Hold Circuit 2 (S&H2)
Sample & Hold Circuit 1 (S&H1)
5.2 Sample & Hold and Output
Relation between video signals C1, C2 and C3 and output pins and two sample & hold circuits.
CX
S1 (S300)
S2 (S299)
S3 (S298)
S4 (S297)
···
S299 (S2)
S300 (S1)
L
Sampling
C1-2 (C3-2) C2-2 (C2-2) C3-2 (C1-2) C1-2 (C3-2)
···
C2-2 (C2-2) C3-2 (C1-2)
Output
C1-1 (C3-1) C2-1 (C2-1) C3-1 (C1-1) C1-1 (C3-1)
···
C2-1 (C2-1) C3-1 (C1-1)
H
Sampling
C1-1 (C3-1) C2-1 (C2-1) C3-1 (C1-1) C1-1 (C3-1)
···
C2-1 (C2-1) C3-1 (C1-1)
Output
C1-2 (C3-2) C2-2 (C2-2) C3-2 (C1-2) C1-2 (C3-2)
···
C2-2 (C2-2) C3-2 (C1-2)
Remark Cm-n = m: Video input, n: Sample & Hold
Data Sheet S14606EJ1V0DS
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