adv7189b Analog Devices, Inc., adv7189b Datasheet - Page 24

• Manufacturer Part Number: adv7189b
• Description: Multiformat Sdtv Video Decoder
• Manufacturer: Analog Devices, Inc.

ADV7189B
SD_SAT_Cr[7:0] SD Saturation Cr Channel, Address
0xE4[7:0]
This register allows the user to control the gain of the Cr
channel only.
Table 24. SD_SAT_Cr Function
SD_SAT_Cr[7:0]
0x80 (default)
0x00
0xFF
SD_OFF_Cb[7:0] SD Offset Cb Channel, Address
0xE1[7:0]
This register allows the user to select an offset for data on the
Cr channel only and adjust the hue of the picture. There is a
functional overlap with the Hue[7:0] register.
Table 25. SD_OFF_Cb Function
SD_OFF_Cb[7:0]
0x80 (default)
0x00
0xFF
SD_OFF_Cr[7:0] SD Offset Cr Channel, Address
0xE2[7:0]
This register allows the user to select an offset for data on the
Cr channel only and adjust the hue of the picture. There is a
functional overlap with the Hue[7:0] register.
Table 26. SD_OFF_Cr Function
SD_OFF_Cr[7:0]
0x80 (default)
0x00
0xFF
BRI[7:0] Brightness Adjust, Address 0x0A[7:0]
This register controls the brightness of the video signal through
the ADV7189B. It allows the user to adjust the brightness of the
picture.
Table 27. BRI Function
BRI[7:0]
0x00 (default)
0x7F
0xFF
HUE[7:0] Hue Adjust, Address 0x0B[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°.
Offset of the luma channel = 0IRE
Description
Offset of the luma channel = +100IRE
Offset of the luma channel = –100IRE
Description
Chroma gain = 0 dB
Gain on Cb channel = −42 dB
Gain on Cb channel = +6 dB
0 offset applied to the Cr channel
Description
−312 mV offset applied to the Cr channel
+312 mV offset applied to the Cr channel
Description
0 offset applied to the Cb channel
−312 mV offset applied to the Cb channel
+312 mV offset applied to the Cb channel
Rev. B | Page 24 of 104
The hue adjustment value is fed into the AM color demodulation
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 28. HUE Function
HUE[7:0]
0x00 (default)
0x7F
0x80
DEF_Y[5:0] Default Value Y, Address 0x0C[7:2]
When the ADV7189B 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:
x
x
The DEF_Y[5:0] values define the 6 MSBs of the output video.
The remaining LSBs are padded with 0s. For example, in 10-bit
mode, the output is Y[9:0] = {DEF_Y[5:0], 0, 0, 0, 0}.
DEF_Y[5:0] is 0x0D (Blue) is the default value for Y.
Register 0x0C has a default value of 0x36.
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
x
x
The data that is finally output from the ADV7189B 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}.
In full 10-bit output mode, two extra LSBs of value 00 are
appended.
DEF_C[7:0] is 0x7C (blue) is the default value for Cr and Cb.
If DEF_VAL_AUTO_EN bit is set to high, and the
ADV7189B 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 can be useful
during configuration.
The DEF_VAL_AUTO_EN bit is set to high and the
ADV7189B can’t lock to the input video (automatic mode).
DEF_VAL_EN bit is set to high (forced output).
Description
Phase of the chroma signal = 0°
Phase of the chroma signal = –90°
Phase of the chroma signal = +90°