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Japan
Imaging IC
- Caution
- The uPD64082 is a phased-out product.
Contents
FAQ-ID : disp-nnnn
uPD64082: Can this IC also be used for PAL?
FAQ-ID : disp-0001Last Updated : 2005/08
- Q-1
-
Can the uPD64082 (3D Y/C separation) also be used for PAL?
- A-1
-
This IC is designed for NTSC only and cannot be used for PAL.
uPD64082: want to increase the resolution by using black and white.
FAQ-ID : disp-0002Last Updated : 2005/08
- Q-1
-
I want to increase the resolution by using black and white, but how should I go about it?
- A-1
-
Since this IC uses color burst signals, use in black and white systems (that do not use burst signals) is not possible.
uPD64082: What are the three dimensions of 3D Y/C separation?
FAQ-ID : disp-0003Last Updated : 2005/08
- Q-1
-
This is a 3D Y/C separation IC, but what are the three dimensions? The screen being flat, so I think it has only two dimensions…
- A-1
-
Yes, the screen is indeed two-dimensional. However, Y/C separation does involve three dimensions, as follows.
1st dimension: Only the horizontal direction information of scan lines is used.
2nd dimension: Top/bottom/right/left separation is performed using the information of the preceding and following scan lines.
3rd dimension: Furthermore, the information between frames is also used.
1st dimension
](images/disp-1.gif)
2nd dimension
](images/disp-2.gif)
3rd dimension
](images/disp-3.gif)
uPD64082: Filters
FAQ-ID : disp-0004Last Updated : 2005/08
- Q-1
-
What kind of filters are placed between FSCO and FSCI of the uPD64082?
- A-1
-
A BPF circuit designed as an example is shown below.
Example of LPF circuit with 4 MHz cutoff (for reference) ](images/64082.gif)
Frequency characteristic (reference value) Freq[MHz] Gain[dB] ------------------- 0 -3 1 -4 2 -5 3 -5 fsc -4 4 -3 5 -8 10 -40 15 -50 20 -48 25 -48
R1=470Ω
R2=470Ω
R3=1kΩ
C1=150pF
C2= 10pF
C3=150pF
C4=0.01uF
L1=15uH
Reduce the harmonic components as much as possible while making sure to secure sufficient amplitude at fsc ±1 kHz.
Be particularly careful to sufficiently reduce the harmonic components of 20MHz, which is the X'tal oscillation frequency.
The operation of this circuit has been verified using NECEL boards, but the required characteristics of fscBPF depend to a large extent on the board pattern.
Therefore, customers should use this circuit based on careful verification that no image-related problems occur under various input signal conditions.
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