adv7188 Analog Devices, Inc., adv7188 Datasheet - Page 37

• Manufacturer Part Number: adv7188
• Description: Multiformat Sdtv Video Decoder With Fast Switch Overlay Support
• Manufacturer: Analog Devices, Inc.

BETACAM, Enable BETACAM Levels, Address 0x01 [5]
If YPrPb data is routed through the ADV7188, the automatic
gain control modes can target different video input levels, as
outlined in Table 44. Note that the BETACAM bit is valid only if
the input mode is YPrPb (component). The BETACAM bit sets
the target value for AGC operation.
A review of the following sections is useful:
•
•
The automatic gain control (AGC) algorithms adjust the levels
based on the setting of the BETACAM bit.
Table 43. BETACAM Function
BETACAM
0 (default)
1
Table 44. BETACAM Levels
Name
Y Range
Pr and Pb Ranges
Sync Depth
The INSEL [3:0], Input Selection, Address 0x00 [3:0]
section describes how component video (YPrPb) can be
routed through the ADV7188.
The Video Standard Selection section describes the various
standards, for example, with and without pedestal.
Selecting PAL without pedestal selects
BETACAM variant
Selecting NTSC with pedestal selects BETACAM
Selecting NTSC without pedestal selects
BETACAM variant
Description
Standard video input (assuming YPrPb is selected
as input format)
Selecting PAL with pedestal selects MII
Selecting PAL without pedestal selects SMPTE
Selecting NTSC with pedestal selects MII
Selecting NTSC without pedestal selects SMPTE
BETACAM input enable (assuming YPrPb is selected
as input format)
Selecting PAL with pedestal selects BETACAM
BETACAM (mV)
0 to 714 (including 7.5% pedestal)
−467 to +467
286
BETACAM Variant (mV)
0 to 714
−505 to +505
286
Rev. A | Page 37 of 112
PW_UPD, Peak White Update, Address 0x2B [0]
The peak white and average video algorithms determine the
gain based on measurements taken from the active video. The
PW_UPD bit determines the rate of gain change. LAGC [2:0]
must be set to the appropriate mode to enable the peak white or
average video mode.
For more information, refer to the LAGC [2:0], Luma Automatic
Gain Control, Address 0x2C [6:4] section.
0—Updates the gain once per video line.
1 (default)—Updates the gain once per field.
SMPTE (mV)
0 to 700
−350 to +350
300
MII (mV)
0 to 700 (including 7.5% pedestal)
−324 to +324
300
ADV7188