ADV7183AKST Analog Devices Inc, ADV7183AKST Datasheet - Page 26

• Manufacturer Part Number: ADV7183AKST
• Description: IC VIDEO DECODER NTSC 80-LQFP
• Manufacturer: Analog Devices Inc
• Type: Video Decoderr

Specifications of ADV7183AKST

• Applications: Projectors, Recorders, Security
• Voltage - Supply, Analog: 3.15 V ~ 3.45 V
• Voltage - Supply, Digital: 1.65 V ~ 2 V
• Mounting Type: Surface Mount
• Package / Case: 80-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

ADV7183A
BRI[7:0] Brightness Adjust, Address 0x0A [7:0]
This register controls the brightness of the video signal through
the ADV7183A.
Table 50. BRI Function
BRI[7:0]
0x00 (default)
0x7F
0x80
HUE[7:0] Hue Adjust, Address 0x0B [7:0]
This register contains the value for the color hue adjustment.
HUE[7:0] has a range of ±90°, with 0x00 equivalent to an
adjustment of 0°. The resolution of HUE[7:0] is 1 bit = 0.7°.
The hue adjustment value is fed into the AM color demodula-
tion block. Therefore, it only applies to video signals that
contain chroma information in the form of an AM modulated
carrier (CVBS or Y/C in PAL or NTSC). It does not affect
SECAM and does not work on component video inputs
(YPrPb).
Table 51. HUE Function
HUE[7:0]
0x00 (default)
0x7F
0x80
DEF_Y[5:0] Default Value Y, Address 0x0C [7:2]
In cases where the ADV7183A loses lock on the incoming video
signal or where there is no input signal, the DEF_Y[5:0] register
allows the user to specify a default luma value to be output.
This value is used under the following conditions:
•
•
The DEF_Y[5:0] values define the 6 MSBs of the output video.
The remaining LSBs are padded with 0s. For example, in 8-bit
mode, the output is Y[7:0] = {DEF_Y[5:0], 0, 0}.
If DEF_VAL_AUTO_EN bit is set to high and the
ADV7183A lost lock to the input video signal. This is the
intended mode of operation (automatic mode).
The DEF_VAL_EN bit is set, regardless of the lock status of
the video decoder. This is a forced mode that may be useful
during configuration.
Phase of the chroma signal = 0°.
Description (Adjust Brightness of the Picture)
Offset of the luma channel = +0IRE.
Offset of the luma channel = +100IRE.
Offset of the luma channel = –100IRE.
Description (Adjust Hue of the Picture)
Phase of the chroma signal = –90°.
Phase of the chroma signal = +90°.
Rev. B | Page 26 of 104
Table 52. DEF_Y Function
DEF_Y[5:0]
0x0D (blue) (default)
DEF_C[7:0] Default Value C, Address 0x0D [7:0]
The DEF_C[7:0] register complements the DEF_Y[5:0] value. It
defines the 4 MSBs of Cr and Cb values to be output if
•
•
The data that is finally output from the ADV7183A for the
chroma side is Cr[7:0] = {DEF_C[7:4], 0, 0, 0, 0}, Cb[7:0] =
{DEF_C[3:0], 0, 0, 0, 0}.
Table 53. DEF_C Function
DEF_C[7:0]
0x7C (blue) (default)
DEF_VAL_EN Default Value Enable,
Address 0x0C [0]
This bit forces the use of the default values for Y, Cr, and Cb.
Refer to the descriptions for DEF_Y and DEF_C for additional
information. The decoder also outputs a stable 27 MHz clock,
HS, and VS in this mode.
Table 54. DEF_VAL_EN Function
DEF_VAL_EN
0 (default)
1
DEF_VAL_AUTO_EN Default Value Automatic Enable,
Address 0x0C [1]
This bit enables the automatic usage of the default values for Y,
Cr, and Cb in cases where the ADV7183A cannot lock to the
video signal.
Table 55. DEF_VAL_AUTO_EN Function
DEF_VAL_AUTO_EN
0
1 (default)
The DEF_VAL_AUTO_EN bit is set to high and the
ADV7183A cannot lock to the input video (automatic
mode).
DEF_VAL_EN bit is set to high (forced output).
Description
Default value of Y.
Description
Default values for Cr and Cb.
Description
Do not force the use of default Y, Cr,
and Cb values. Output colors
dependent on DEF_VAL_AUTO_EN.
Always use default Y, Cr, and Cb values.
Override picture data even if the video
decoder is locked.
Description
Do not use default Y, Cr, and Cb values.
If unlocked, output noise.
Use default Y, Cr, and Cb values when
decoder loses lock.