ADV7181BCP Analog Devices Inc, ADV7181BCP Datasheet - Page 25

• Manufacturer Part Number: ADV7181BCP
• Description: IC VIDEO DECODER NTSC 64-LFCSP
• Manufacturer: Analog Devices Inc
• Type: Video Decoderr

Specifications of ADV7181BCP

• Applications: Recorders, Set-Top Boxes
• Voltage - Supply, Analog: 3.15 V ~ 3.45 V
• Voltage - Supply, Digital: 1.65 V ~ 2 V
• Mounting Type: Surface Mount
• Package / Case: 64-LFCSP
• Adc/dac Resolution: 9b
• Screening Level: Industrial
• Package Type: LFCSP EP
• Pin Count: 64
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With: EVAL-ADV7181BEB - BOARD EVALUATION FOR ADV7181
• Lead Free Status / RoHS Status: Compliant, Contains lead / RoHS non-compliant

BRI[7:0] Brightness Adjust, Address 0x0A [7:0]
This register controls the brightness of the video signal through
the ADV7181.
Table 49. 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 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 50. HUE Function
HUE[7:0]
0x00 (default)
0x7F
0x80
DEF_Y[5:0] Default Value Y, Address 0x0C [7:2]
When the ADV7181 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:
•
•
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
ADV7181 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.
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 = 0°.
Phase of the chroma signal = +90°.
Phase of the chroma signal = –90°.
Rev. B | Page 25 of 104
Table 51. 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 ADV7181 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 52. 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 53. 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 when the ADV7181 cannot lock to the video signal.
Table 54. DEF_VAL_AUTO_EN Function
DEF_VAL_AUTO_EN
0
1 (default)
The DEF_VAL_AUTO_EN bit is set to high and the
ADV7181 can’t lock to the input video (automatic mode).
DEF_VAL_EN bit is set to high (forced output).
Description
Don't use default Y, Cr, and Cb values. If
unlocked, output noise.
Use default Y, Cr, and Cb values when
the decoder loses lock.
Description
Default value of Y.
Description
Default values for Cr and Cb.
Description
Don't 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.
ADV7181