LC74402E
LC74402E is PIP Controllers manufactured by SANYO.
Overview
The LC74401E, LC74402, and LC74402E are memory controllers for TV set and VCR PIP (picture in picture) systems. Since these LSIs include three D/A converter circuits, a ponent PIP system can be constructed by bining one of these LSIs with memory and an A/D converter such as the LC7480.
Features
- Horizontal resolution: 600 TV lines- 1
- Three D/A converters (for the Y, R-Y, and B-Y signals) are incorporated in the PIP memory controller block.
- High image quality is supported by vertical filter function frame memory processing- 2.
- I2C bus controlled.
- Built-in PLL circuit (requires an external LPF)
- Supports NTSC, PAL, and multiple (NTSC-PAL) formats
- External control functions (only provided by the
LC74401E)
- 8-bit D/A converter (PWM): Six pins
- General-purpose ports: Four pins
- Sub-screen specifications
- Number of sub-screens: 1-8- 2
- Display on/off and frame on/off/color switching, wipe function
- Supports switching between fixed (4 corners) and arbitrary (8-bit specification of vertical and horizontal position) display positions.
- Size: Area: 1/4, 1/9, 1/16, Vertical pression: 1/2,
1/3, 1/4; Horizontal pression: 2/3, 1/3, 1/6 Note: Horizontal pression can be adjusted by changing the PLL divisor. The display area can be changed independently in the vertical and horizontal directions.
- Horizontal resolution (Y signal): About 250 dots
- Gradation (quantization): 64 (6 bits)
- Operating supply voltage: 5 V ± 10%
- QFP80E: LC74401E
- DIP64S: LC74402-Pin assignment identical to the LC7442 (except for the serial control pins)
- QFP64E: LC74402E-Pin assignment identical to the LC7442E (except for the serial control pins) Note 1
D/A Clock
15.00 MHz
R-Y
3.75 MHz
B-Y
3.75 MHz
When the main screen synchronization PLL has the standard value (PLL7 to PLL3 = 10011)
Note 2: The specifications depend on the amount of external memory as listed in the table below.
Display memory 256 K 1 M
One screen v
Two screens
!
Three screens
!...
