Planar LC640.480.33-AC manual Video Signals, Video Signal Characteristics, Video Modes

Video Signals

Video Signal Characteristics

Video signal inputs on J3 are digital inputs and are compatible with CMOS logic.

Table 8. Video Signal DC Characteristics.

Description	Symbol	Minimum	Maximum	Units
Absolute Maximum Input Voltage	VImax	-0.3	VL + 0.3	Vdc
Low-level Input Voltage	VIL	0	0.3VL	Vdc
High-level Input Voltage	VIH	0.7VL	VL	Vdc
Low-level Input Current1	IIL1	–	1	µA
	IIL2	–	60	µA
High-level Input Current2	IIH1	–	1	µA
	IIH2	–	60	µA

1.I IL1 applies to all signals except R/L and U/D. IIL2 applies to signals R/L and U/D.

2.IIH1 applies to all signals except ENAB, U/D, and R/L. IIH2 applies to signals ENAB, U/D, and R/L.

Video Modes

The video interface automatically recognizes 480-, 400-, and 350-line formats. Mode recognition depends on the polarity of the sync signals as shown in Table 9.

Table 9. Video Modes.

Mode	480 line	400 line	350 line
Hsync (J3-3)	negative	negative	positive
Vsync (J3-4)	negative	positive	negative

In 400-line and 350-line modes, the screen image will be automatically centered as shown in Figure 4 below.

Figure 4. Image centering.

data invalid period

data period

data invalid period

400 lines mode (TV=449)

40 lines

400lines

40lines

data invalid period

data period

data invalid period

350 lines mode (TV=449)

65 lines

350lines

65lines

10 LC640.480.33-AC Operations Manual (OM600-01)