ADV7183BBSTZ Analog Devices Inc, ADV7183BBSTZ Datasheet - Page 32

• Manufacturer Part Number: ADV7183BBSTZ
• Description: IC,TV/VIDEO CIRCUIT,Color Decoder Circuit,CMOS,QFP,80PIN,PLASTIC
• Manufacturer: Analog Devices Inc
• Type: Video Decoderr

Specifications of ADV7183BBSTZ

• Applications: Projectors, Recorders, Security
• Voltage - Supply, Analog: 3.15 V ~ 3.45 V
• Voltage - Supply, Digital: 1.65 V ~ 2 V
• Mounting Type: Surface Mount
• Package / Case: 80-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ADV7183B
For example, program the ADV7183B into manual fixed gain
mode with a desired gain of 0.89.
1.
2.
3.
4.
5.
BETACAM Enable Betacam Levels, Address 0x01[5]
If YPrPb data is routed through the ADV7183B, the automatic
gain control modes can target different video input levels, as
outlined in
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 37. BETACAM Function
BETACAM
0 (default)
1
Table 40. Betacam Levels
Name
Y Range
Pb and Pr Range
Sync Depth
Use Equation 1 to convert the gain:
0.89 × 2048 = 1822.72
Truncate to integer value:
1822.72 = 1822
Convert to hexadecimal:
1822d = 0x71E
Split into two registers and program:
Luma Gain Control 1[3:0] = 0x7
Luma Gain Control 2[7:0] = 0x1E
Enable manual fixed gain mode:
Set LAGC[2:0] to 000
I NSEL[3:0] Input Selection, Address 0x00[3:0] to find how
1 9 3 H
component video (YPrPb) can be routed through the
ADV7183B.
V ideo Standard Selection to select the various standards,
1 9 4 H
such as those with and without pedestal.
F igure 40. The BETACAM bit is valid only if the
1 9 2 H
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 (includes 7.5% pedestal)
–467 to +467
286
T able 37).
1 9 5 H
Betacam Variant (mV)
0 to 714
–505 to +505
286
Rev. B | Page 32 of 100
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. The
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
Control,
Address 0x2C[7:0] section.
Setting PW_UPD to 0 updates the gain once per video line.
Setting PW_UPD to 1 (default) updates the gain once per field.
Chroma Gain
CAGC[1:0] Chroma Automatic Gain Control,
Address 0x2C[1:0]
The two bits of the Color Automatic Gain Control mode select
the basic mode of operation for automatic gain control in the
chroma path.
Table 38. 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 con-
trol. This register has an effect only if the CAGC[1:0] register is
set to 10 (automatic gain).
Table 39. CAGT Function
CAGT[1:0]
00
01
10
11 (default)
SMPTE (mV)
0 to 700
–350 to +350
300
Description
Manual fixed gain (use CMG[11:0])
Use luma gain for chroma
Automatic gain (based on color burst)
Freeze chroma gain
L AGC[2:0] Luma Automatic Gain
1 9 6 H
Slow (TC = 2 sec)
Medium (TC = 1 sec)
Fast (TC = 0.2 sec)
Adaptive
Description
MII (mV)
–324 to +324
300
0 to 700 (includes 7.5% pedestal)