ADV7181BCP Analog Devices Inc, ADV7181BCP Datasheet - Page 33

• Manufacturer Part Number: ADV7181BCP
• Description: IC VIDEO DECODER NTSC 64-LFCSP
• Manufacturer: Analog Devices Inc
• Type: Video Decoderr

Specifications of ADV7181BCP

• Applications: Recorders, Set-Top Boxes
• Voltage - Supply, Analog: 3.15 V ~ 3.45 V
• Voltage - Supply, Digital: 1.65 V ~ 2 V
• Mounting Type: Surface Mount
• Package / Case: 64-LFCSP
• Adc/dac Resolution: 9b
• Screening Level: Industrial
• Package Type: LFCSP EP
• Pin Count: 64
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With: EVAL-ADV7181BEB - BOARD EVALUATION FOR ADV7181
• Lead Free Status / RoHS Status: Compliant, Contains lead / RoHS non-compliant

BETACAM Enable Betacam Levels, Address 0x01 [5]
If YPrPb data is routed through the ADV7181, the automatic
gain control modes can target different video input levels, as
outlined in Table 70. 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 (see Table 66.).
Table 66. BETACAM Function
BETACAM
0 (default)
1
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 in the first place. For more information,
refer to the LAGC[2:0] Luma Automatic Gain Control,
Address 0x2C [7:0] section.
Table 70. Betacam Levels
Name
Y Range
Pb and Pr Range
Sync Depth
SETADC_sw_man_en, Manual Input Muxing Enable,
Address C4 [7] to find how component video (YPrPb) can
be routed through the ADV7181.
Video Standard Selection to select the various standards,
for example, with and without pedestal.
Description
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.
Assuming YPrPb is selected as input format.
Selecting PAL with pedestal selects BETACAM.
Selecting PAL without pedestal selects BETACAM
variant.
Selecting NTSC with pedestal selects BETACAM.
Selecting NTSC without pedestal selects BETACAM
variant.
Betacam (mV)
0 to 714 (incl. 7.5% pedestal)
–467 to +467
286
Betacam Variant (mV)
0 to 714
–505 to +505
286
Rev. B | Page 33 of 104
Table 67. PW_UPD Function
PW_UPD
0
1 (default)
Chroma Gain
CAGC[1:0] Chroma Automatic Gain Control,
Address 0x2C [1:0]
The two bits of Color Automatic Gain Control mode select
the basic mode of operation for automatic gain control in the
chroma path.
Table 68. CAGC Function
CAGC[1:0]
00
01
10 (default)
11
CAGT[1:0] Chroma Automatic Gain Timing,
Address 0x2D [7:6]
The Chroma Automatic Gain Timing register allows the user
to influence the tracking speed of the chroma automatic gain
control. This register has an effect only if the CAGC[1:0]
register is set to 10 (automatic gain).
Table 69. CAGT Function
CAGT[1:0]
00
01
10
11 (default)
SMPTE (mV)
0 to 700
–350 to +350
300
Description
Update gain once per video line.
Update gain once per field.
Description
Manual fixed gain (use CMG[11:0]).
Use luma gain for chroma.
Automatic gain (based on color burst).
Freeze chroma gain.
Description
Slow (TC = 2 s)
Medium (TC = 1 s)
Fast (TC = 0.2 s)
Adaptive
MII (mV)
0 to 700 (incl. 7.5% pedestal)
–324 to +324
300
ADV7181