ml86v7667 Oki Semiconductor, ml86v7667 Datasheet - Page 8

• Manufacturer Part Number: ml86v7667
• Description: Ntsc/pal Digital Video Decoder
• Manufacturer: Oki Semiconductor

FUNCTIONAL DESCRIPTION
This section explains the basic functions of the IC in terms of the blocks shown in the block diagram.
Refer to the User's manual for detailed explanations of the internal registers and any functions that are not covered
in this data sheet.
Analog Section
The analog section inputs video signals. The analog section uses the video signal channel selector, AMP and 10-bit
ADC to select the desired channel from among several video signals and convert the input to digital video data.
OKI Semiconductor
Analog input selector
Clamp function
AMP/analog AGC function
The analog input selector is compatible with composite signals. The maximum number of input connections is
2 channels of composite signals. The selection of these input connections can be changed by external pins or by
register controls using the I
# Related register: $1E/ADC1[0]
The clamp fixes the video input signal in the ADC input range. Clamping is performed by sync chip clamp.
Setting register $1F/ADC2[3:1] to "111" and raising the clump voltage allows the luminance level to be
stabilized and saturation of the luminance level to be relaxed.
# Related register: $1F/AD2
This function converts video input signals to the optimum level for the ADC using the analog AMP of the AGC
function. The AGC function has an output level adjust function in the luminance block of the digital section in
addition to the AMP input level adjust function. Manual setting of the AMP gain is also possible.
# Related register: $1F/ADC2
Pin 53 M[1] "0": External pin analog gain setting mode
*: Default setting after LSI is reset.
*Composite-1 input
Composite-2 input
Input signal
Gain setting pin
Pin 53 M[1] = 0
"1": Internal register analog gain setting mode
GAINS[2:0]
2
C-bus.
[000]
[001]
[010]
[011]
[100]
[101]
[110]
[111]
Analog Amplifier Manual Gain Control
Pin 53 M[1] = 0 Pin 53 M[1] = 1
Analog Input Requirements
Control pin
INS
[0]
[1]
Pin 53 M[1] = 1
$1F/ADC2[6:4]
Register
*[001]
[000]
[010]
[011]
[100]
[101]
[110]
[111]
Register
ADC1[0]
*[0]
[1]
Typical value (X times)
Setting gain value
Composite
VIN1
0.55
0.70
0.93
1.21
1.60
2.09
2.65
3.45
Input pin
Composite
VIN2
PEDL86V7667-00
ML86V7667
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