ADV7182ABCPZ datasheet(26/102 Pages) AD

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ADV7182A

Data Sheet

Rev. 0 | Page 26 of 102

SD_SAT_Cb[7:0], SD Saturation Cb Channel—

Address 0xE3, Bits[7:0]

This register allows the user to control the gain of the blue

chroma (Cb) channel only, which in turn adjusts the saturation

of the picture.

Table 26. SD_SAT_Cb Function

SD_SAT_Cb[7:0]

Description

0x80 (default)

Gain on Cb channel = 0 dB

0x00

Gain on Cb channel = −42 dB

0xFF

Gain on Cb channel = +6 dB

SD_SAT_Cr[7:0], SD Saturation Red Chroma (Cr)

Channel—Address 0xE4, Bits[7:0]

This register allows the user to control the gain of the red

chroma (Cr) channel only, which in turn adjusts the saturation

of the picture.

Table 27. SD_SAT_Cr Function

SD_SAT_Cr[7:0]

Description

0x80 (default)

Gain on Cr channel = 0 dB

0x00

Gain on Cr channel = −42 dB

0xFF

Gain on Cr channel = +6 dB

SD_OFF_Cb[7:0], SD Offset Cb Channel—Address 0xE1,

Bits[7:0]

This register allows the user to select an offset for the Cb channel

only and to adjust the hue of the picture. There is a functional

overlap with the HUE[7:0] register (Address 0x0B).

Table 28. SD_OFF_Cb Function

SD_OFF_Cb[7:0]

Description

0x80 (default)

0 mV offset applied to the Cb channel

0x00

−312 mV offset applied to the Cb channel

0xFF

+312 mV offset applied to the Cb channel

SD_OFF_Cr[7:0], SD Offset Cr Channel—Address 0xE2,

Bits[7:0]

This register allows the user to select an offset for the Cr channel

only and to adjust the hue of the picture. There is a functional

overlap with the HUE[7:0] register.

Table 29. SD_OFF_Cr Function

SD_OFF_Cr[7:0]

Description

0x80 (default)

0 mV offset applied to the Cr channel

0x00

−312 mV offset applied to the Cr channel

0xFF

+312 mV offset applied to the Cr channel

BRI[7:0], Brightness Adjust—Address 0x0A, Bits[7:0]

This register controls the brightness of the video signal. It

allows the user to adjust the brightness of the picture.

Table 30. BRI Function

BRI[7:0]

Description

0x00 (default)

Offset of the luma channel = 0 IRE

0x7F

Offset of the luma channel = +30 IRE

0x80

Offset of the luma channel = −30 IRE

HUE[7:0], Hue Adjust—Address 0x0B, Bits[7:0]

This register contains the value for the color hue adjustment. It

allows the user to adjust the hue of the picture.

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 color demodulation block.

Therefore, it applies only 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 31. HUE Function

HUE[7:0]

Description (Adjust Hue of the Picture)

0x00 (default)

Phase of the chroma signal = 0°

0x7F

Phase of the chroma signal = −90°

0x80

Phase of the chroma signal = +90°

DEF_Y[5:0], Default Value Y—Address 0x0C, Bits[7:2]

When the ADV7182A loses lock on the incoming video signal

or when 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:



If the DEF_VAL_AUTO_EN bit is 1 and the ADV7182A

lost lock to the input video signal, this is the intended

mode of operation (automatic mode).



If the DEF_VAL_EN bit is 1, regardless of the lock status of

the video decoder, this is a forced mode that is useful

during configuration.

The DEF_Y[5:0] values define the six 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].

For DEF_Y[5:0], 0x0D (blue) is the default value for Y.

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