Overview
The LC74411N and LC74411NE are digital processing
controllers for PIP (picture-in-picture) systems in TV sets
and VCRs. These ICs incorporate three circuits, a
multiplexed A/D converter, field memory, and a D/A
converter, to implement the PIP digital processing block in
a single chip.
Features
Horizontal resolution: 450 pixels*
Single-chip implementation of the three circuits required
in a PIP digital processing block: A/D converter, field
memory, and D/A converter circuits
High image quality provided by vertical filtering
I
2
C bus adopted
Built-in PLL circuit (requires an external low-pass filter)
Supports NTSC and PAL, TV and VCR applications,
and multi-format (NTSC and PAL) applications.
External control function
8-bit D/A converter (PWM type): 6 pins
General-purpose ports: 8 pins
Sub-screen specifications
Display on/off, frame/no frame, frame color switching,
wipe function
Display position - Specifiable as an 8-bit value for each
of the horizontal and vertical directions.
Size
Vertical reduction: 1/3, 1/4
Horizontal reduction: 1/3, 1/4
The horizontal size can be adjusted by adjusting the
PLL divisor
The display area vertical and horizontal positions
can be varied independently.
Horizontal resolution (Y signal): about 190 dots
Quantization: 6 bits
Operating supply voltage LC74411NE
: 5 V 5%
LC74411N
: 5 V 10%
Package
LC74411NE
: QFP64E
LC74411N
: DIP64S
Package Dimensions
unit: mm
3071-DIP64S
unit: mm
3159-QFP64E
CMOS LSI
Ordering number : EN
*
5519A
93196HA (OT) No. 5519-1/14
Preliminary
SANYO: DIP64S
[LC74411N]
SANYO: QIP64E
[LC74411NE]
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
PIP Controller
LC74411N, LC74411NE
Note:
When the main screen
synchronization PLL uses the
standard value
(PLL4 : 0 = 10110)
D/A clock
Y
11.6 MHz
R-Y
2.9 MHz
B-Y
2.9 MHz
Pin Assignments
No. 5519-2/14
LC74411N, LC74411NE
Block Diagram
No. 5519-3/14
LC74411N, LC74411NE
LC74411N and LC74411NE Based PIP System
Function Overview
Reduction sizes
Vertical
: 1/3, 1/4; The vertical filter coefficient can be selected.
Horizontal : 1/3, 1/4; Variable at the PLL.
Still image
Field still image
Display position
Eight bits in each of the vertical and horizontal directions
Frame
Frame or no frame can be selected.
Frame types differ according to the insertion method
Pin frame
: A pin output that goes high at the frame position (for frame insertion by the application)
DAC frame : Frame overlapped onto the image signal. Four bits for each of the Y, R-Y, and B-Y signals.
Wipe
Supports eleven different types of wipe.
Blanking size
The vertical and horizontal directions can be specified independently (6 bits each)
Eleven form specification types
Memory clear
The image data written to memory can be set to a fixed value.
Either 25% white or blue can be selected.
Wide-aspect-ratio TV support
Aspect compensation function
Support for NTSC, PAL, and multi-format systems
External control function using the I
2
C bus
Incorporates six on-chip 8-bit D/A converter circuits
Provides eight general-purpose port pins.
Wide range of settings and adjustments
Sub-screen displacement, color shifting, and other settings can be adjusted using the I
2
C bus.
No. 5519-4/14
LC74411N, LC74411NE
Sub-Screen Size
The vertical and horizontal directions can be controlled independently.
Vertical size
1/3: Three scan lines are compressed to one.
1/4: Four scan lines are compressed to one.
Horizontal size
1/3: A/D clock : D/A clock = 1:3
1/4: A/D clock : D/A clock = 1:4
When 1/4 compression is used, the output data will be 3/4 of 1/3 of the input data.
Aspect ratio correction function
The horizontal size is adjusted by changing the VCO frequency (system clock).
This frequency can be changed from 30% to +30%.
Wipe Function
The WTOP, WBOT, WLEFT, and WRIGHT operations can be specified independently.
Display Area Function
This function controls an area to be blanked.
The vertical and horizontal directions can be set independently.
The operating mode is set using the wipe function WTOP, WBOT, WLEFT, and WRIGHT parameters.
No. 5519-5/14
LC74411N, LC74411NE
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