ADA4424 AD [Analog Devices], ADA4424 Datasheet - Page 12

• Manufacturer Part Number: ADA4424
• Description: 6-Channel SD/ED/HD Video Filter with Charge Pump
• Manufacturer: AD [Analog Devices]

ADA4424-6
Fixed Offset Cancellation Mode
In addition to the automatic mode, there are two levels of fixed
offset correction available. In high offset mode, fixed voltages of
1.0 V and 1.1 V are subtracted from the Y_IN and HY_IN inputs,
respectively. In low offset mode, a fixed voltage of 0.33 V is
subtracted from both Y_IN and HY_IN. The various modes of
offset cancellation are outlined in Table 6.
Table 6. Offset Cancellation Mode Selection
MODE1
(Pin 23)
Low (0)
Low (0)
High (1)
High (1)
Offset Cancellation Disable
The offset cancellation function can be enabled or disabled via
the OFFSET_ENB pin, as described in Table 7.
Table 7. Offset Cancellation Enable/Disable
OFFSET_ENB
(Pin 17)
Low (0)
High (1)
MODE0
(Pin 16)
Low (0)
High (1)
Low (0)
High (1)
Offset Cancellation State
Offset cancellation is disabled.
Offset cancellation is enabled. Function is
determined by the MODE1 and MODE0 pins
(see Table 6).
Output Offset Cancellation
Auto-cancel, sync-tip sampling mode.
Clamps the input referred SD sync tip
to −214 mV, and the input referred
ED/HD sync tip to −300 mV.
Auto-cancel, back porch sampling
mode. Sets the output blanking level
to 0 V, independent of sync depth.
Fixed cancellation mode, high dc
offset.
Subtracts 1.0 V from the Y_IN signal;
subtracts 1.1 V from the HY_IN signal.
Fixed cancellation mode, low dc offset.
Subtracts 0.33 V from both the Y_IN
and HY_IN signals.
Rev. C | Page 12 of 16
D-TERMINAL AND S-TERMINAL SUPPORT
Full D-terminal support (EIAJ RC-5237 D5) is provided for the
component channels (HY_OUT, HPb_OUT, HPr_OUT). Level
D1 through Level D5 are supported for vertical resolution, scan
type, and aspect ratio selection. Details are shown in Table 8,
Table 9, and Table 10.
S-terminal (also known as S_DC or S1/S2) support for S-video
aspect ratio selection is also provided, as described in Table 11.
The VDD5 pin (Pin 38) provides 5 V power for these outputs.
If D- or S-terminal support is not required, it is recommended
that Pin 2 to Pin 5 and Pin 34 to Pin 38 remain unconnected.
Table 8. D-Terminal Control for Vertical Resolution Selection
Input Logic
Level D1 (Pin 2)
Low (0)
Mid or open
High (1)
Table 9. D-Terminal Control for Scan Selection
Input Logic Level
D2 (Pin 3)
Low (0)
Mid or open
High (1)
Table 10. D-Terminal Control for Aspect Ratio Selection
Input Logic Level
D3 (Pin 4)
Low (0)
Mid or open
High (1)
Table 11. S-Terminal Control for Aspect Ratio Selection
Input Logic Level
S (Pin 5)
Low (0)
Mid or open
High (1)
Nominal Output (V)
L1_OUT (Pin 37)
R
0.0
2.1
4.5
L
= 100 kΩ
Nominal Output (V)
L2_OUT (Pin 36)
R
0.0
2.1
4.5
Nominal Output (V)
L3_OUT (Pin 35)
R
0.0
2.1
4.5
Nominal Output (V)
S1/S2_OUT (Pin 34)
R
0.0
2.1
4.5
L
L
L
= 100 kΩ
= 100 kΩ
= 100 kΩ
Vertical Resolution
(Number of Lines)
480
720
1080
Scan Type
Interlaced
N/A
Progressive
Aspect Ratio
4:3
4:3 letterbox
16:9
Aspect Ratio
4:3
4:3 letterbox
16:9