ml86v7668a Oki Semiconductor, ml86v7668a Datasheet - Page 9

• Manufacturer Part Number: ml86v7668a
• Description: Ntsc/pal/secam Digital Video Decoder
• Manufacturer: Oki Semiconductor

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Digital Section
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2-dimensional Y/C Separation Block
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OKI Semiconductor
Clamp function
A/D converter
Decimation filter
2-Dimensional Y/C Separation Function
YC1[6:4]
The clamp fixes the video input signal in the ADC input range. Clamping is performed by sync chip clamp.
This 10-bit A/D converter (ADC) converts analog video signals to digital video data. There are 2 channels
built into the ADC. Sampling is performed at the pixel frequency or double-speed.
# Related registers: $68/ADC1, $69/ADC2, $6A/ADC3
The digital section separates the video data digitized by the ADC into Y and C data, converts these data to
various data formats and outputs them. The digital section also performs output level adjustment, image quality
adjustment and various corrections.
Since internal processing is performed at a single speed, this filter is needed to reduce the data that has been
doubled by one-half. Using the decimation filter after double-speed sampling reduces high-frequency noise .
# Related register: $08/FIFOBC[7]
This block separates composite data into Y (luminance) data and C (chrominance) data. For S-Video input, the
Y/C separation circuit is bypassed.
With the Y/C separation filter, composite data is separated into Y (luminance) data and C (chrominance) data.
There are various Y/C separation filters available, which can be selected in an internal register.
Y/C separation of the SECAM signal is performed by the trap filter.
# Related registers: $10/YC1, $11/YC2, $12/YC3
*000
001
010
011
100
101
110
111
2-line or 3-line adaptive transition filter
3-line comb or trap adaptive filter
NTSC Y/C separation
3-line comb filter
Adaptive filter
Undefined
Undefined
Undefined
Trap filter
2-line comb or trap adaptive transition filter
PAL Y/C separation
2-line comb filter
Adaptive filter
Undefined
Undefined
Undefined
Undefined
Trap filter
FEDL86V7668A-01
ML86V7668A
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