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ADV7181BBCPZ Datasheet(PDF) 23 Page - Analog Devices |
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ADV7181BBCPZ Datasheet(HTML) 23 Page - Analog Devices |
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23 / 96 page  ADV7181B Rev. 0 | Page 23 of 96 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, which in turn adjusts the saturation of the picture. Table 22. SD_SAT_Cr Function SD_SAT_Cr[7:0] Description 0x80 (default) Gain on Cr channel = 0 dB. 0x00 Gain on Cb channel = −42 dB. 0xFF Gain on Cb channel = +6 dB. SD_OFF_Cb[7:0] SD Offset Cb Channel, Address 0xE1 [7:0] This register allows the user to select an offset for the Cb channel only and adjust the hue of the picture. There is a functional overlap with the Hue [7:0] register. Table 23. SD_OFF_Cb Function SD_OFF_Cb[7:0] Description 0x80 (default) 0 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 [7:0] This register allows the user to select an offset for the Cr channel only and adjust the hue of the picture. There is a functional overlap with the Hue [7:0] register. Table 24. SD_OFF_Cr Function SD_OFF_Cr[7:0] Description 0x80 (default) 0 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 [7:0] This register controls the brightness of the video signal. It allows the user to adjust the brightness of the picture. Table 25. BRI Function BRI[7:0] Description 0x00 (default) Offset of the luma channel = 0IRE. 0x7F Offset of the luma channel = 100IRE. 0x80 Offset of the luma channel = –100IRE. 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°. 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 26. 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 [7:2] When the ADV7181B 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 DEF_VAL_AUTO_EN bit is set to high and the ADV7181B 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. 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}. 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 • The DEF_VAL_AUTO_EN bit is set to high and the ADV7181B can’t lock to the input video (automatic mode). • DEF_VAL_EN bit is set to high (forced output). The data that is finally output from the ADV7181B 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}. DEF_C[7:0] is 0x7C (blue) is the default value for Cr and Cb. |
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