Peak White Feature - Analog Devices ADV7850 Hardware Manual

Function
sdp_limit_c_gain
1
0 
sdp_limit_uv_gain, Addr 90 (SDP), Address 0x89[5]
This control is used to limit U/V gain.
Function
sdp_limit_uv_gain
1
0 
sdp_limit_g_gain, Addr 90 (SDP), Address 0x89[4]
This control is used to limit the SD SCART FB RGB gain.
Function
sdp_limit_g_gain
1
0 
sdp_c_dgain_speed[4:0], Addr 90 (SDP), Address 0x0B[4:0]
This control is used to adjust the speed of chroma digital gain operation. Only values of 1 to 6 are within a valid range. This register has
an effect only if sdp_c_agc_en is set to 1.
Function
sdp_c_dgain_speed[4:0
]
00000
Valid range
All other values
sdp_c_dgain_speed[4:0] allows the user to influence the tracking speed of the chroma automatic gain control. Note that this control has
an effect only if sdp_c_agc_en is set to 1 (automatic gain). A setting of 0 freezes the chroma digital gain. The larger the register value, the
faster the loop operates. Values above 0x06 are reserved.

Peak White Feature

6.6.3
sdp_pw_en, Addr 90 (SDP), Address 0x03[6]
This control is used to enable the peak white luma gain feature.
Function
sdp_pw_en
1 
0
sdp_pw_rec_rate[11:0], Addr 90 (SDP), Address 0x0F[3:0]; Address 0x10[7:0]
This control is used to adjust the peak white gain recovery speed, that is, the speed at which the luma gain is increased following a gain
reduction to a peak white violation. A larger value corresponds to a faster speed.
Rev. A May 2012
Description
Limit chroma gain to range of 50% to 200%
Normal operation
Description
Limit U/V gain to range of 50% to 200%
Normal operation
Description
Limit SD (FB) RGB gain to range of 50% to 200%
Normal operation
Description
Freeze clamp gain
1 to 6
Reserved
Description
Enable peak white luma gain control
Disable peak white luma gain control
85
ADV7850