Analog Devices Advantiv ADV7619 Hardware User's Manual page 126

UG-237
Table 49. Settings Required to Support Extended Range Video Input
2
I C Setting/Mode Analog Modes
OP_656_RANGE 1
1
ALT_DATA_SAT
Pregain Block
To compensate for signal attenuation in the analog front end of the ADV7619 and input buffer gain, a pregain block is provided in the CP
path. The pregain block is controlled by CP_MODE_GAIN_ADJ[7:0] , which represents an unsigned value in a 1.7 binary format. The
range of CP_MODE_GAIN_ADJ[7:0] is 0 to 1.99.
The MSB of CP_MODE_GAIN_ADJ[7:0] represents the integer part of the pregain value while the 7 LSBs represents the fractional part
of the pregain value.
CP_MODE_GAIN_ADJ[7:0] , Addr 44 (CP), Address 0x40[7:0]
Pregain adjustment to compensate for the gain of the analog front end. This register stores a value in a 1.7 binary format.
Function
CP_MODE_GAIN_ADJ[7:0]
0xxxxxxx
10000000
1xxxxxxx
CP_MODE_GAIN_ADJ_EN , Addr 44 (CP), Address 0x3E[2]
A control to enable pregain.
Function
CP_MODE_GAIN_ADJ_EN
0 (default)
1
HDMI Mode YUV HDMI Mode RGB [0 to 255]
1 0
1 0
Description
Gain of (0 + (xxxxxxx/128))
Default pregain (pregain of 1.0)
Gain of (1 + (xxxxxxx/128))
Description
The pregain block is bypassed.
The pregain block is enabled.
Rev. A | Page 126 of 204
Hardware User Guide
HDMI Mode RGB [16 to 235]
1
1