Analog Devices ADV7181B Manual page 87

Subaddress Register Bit Description
0xF4 Drive DR_STR_S[1:0]. Select the drive
Strength strength for the Sync output signals.
DR_STR_C[1:0]. Select the drive
strength for the Clock output signal.
DR_STR[1:0]. Select the drive
strength for the data output signals.
Can be increased or decreased for
EMC or crosstalk reasons.
Reserved.
0xF8 IF Comp IFFILTSEL[2:0]. IF filter selection for
Control Pal and NTSC.
Reserved.
0xF9 VS Mode EXTEND_VS_MAX_FREQ.
Control
EXTEND_VS_MIN_FREQ.
VS_COAST_MODE[1:0].
Reserved.
Bits
7 6 5 4 3 2 1
0
0
1
1
0 0
0 1
1 0
1 1
0 0
0 1
1 0
1 1
x x
0 0
0 0
0 1
0 1
1 0
1 0
1 1
1 1
0 0 0 0 0
0
1
0 0
0 1
1 0
1 1
0 0 0 0
Rev. B | Page 87 of 100
0 Comments
0 Low drive strength (1x)
1 Medium-low drive
strength (2x)
0 Medium-high drive
strength (3x)
1 High drive strength (4x)
Low drive strength (1x)
Medium-low drive
strength (2x)
Medium-high drive
strength (3x)
High drive strength (4x)
Low drive strength (1x)
Medium-low drive
strength (2x)
Medium-high drive
strength (3x)
High drive strength (4x)
No delay
0 Bypass mode
2 MHz 5 MHz
−3 dB −2 dB
1
−6 dB
0 +3.5 dB
−10 dB
1 +5 dB
0 Reserved
3 MHz 6 MHz
−2 dB
1 +2 dB
−5 dB
0 +3 dB
−7 dB
1 +5 dB
0 Limit maximum Vsync
frequency to 66.25 Hz
(475 lines/frame)
1 Limit maximum Vsync
frequency to 70.09 Hz
(449 lines/frame)
Limit minimum Vsync
frequency to 42.75 Hz
(731 lines/frame)
Limit minimum Vsync
frequency to 39.51 Hz
(791 lines/frame)
Auto coast mode
50 Hz coast mode
60 Hz coast mode
Reserved
ADV7181B
Notes
0 dB.
NTSC filters.
PAL filters.
This value sets up
the output coast
frequency.