ADV7180WBSTZ datasheet(37/120 Pages) AD

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Data Sheet

ADV7180

Rev. G | Page 37 of 120

BETACAM, Enable Betacam Levels, Address 0x01[5]

If YPrPb data is routed through the ADV7180, the automatic

gain control modes can target different video input levels, as

outlined in Table 44. 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 MAN_MUX_EN, Manual Input Muxing Enable,

Address 0xC4[7] section for how component video

(YPrPb) can be routed through the ADV7180.

•

The Video Standard Selection section to select the various

standards, for example, with and without pedestal.

The AGC algorithms adjust the levels based on the setting of

the BETACAM bit (see Table 42).

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, see the

LAGC[2:0], Luma Automatic Gain Control, Address 0x2C[6:4]

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 color automatic gain control mode select the

basic mode of operation for automatic gain control in the

chroma path.

Table 42. BETACAM Function

BETACAM

Description

0 (default)

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.

Table 43. CAGC Function

CAGC[1:0]

Description

Manual fixed gain (use CMG[11:0])

Luma gain used for chroma

10 (default)

Automatic gain (based on color burst)

Freeze chroma gain

Table 44. BETACAM Levels

Name

BETACAM (mV)

BETACAM Variant (mV)

SMPTE (mV)

MII (mV)

0 to +714 (including 7.5% pedestal)

0 to +714

0 to +700

0 to +700 (including 7.5% pedestal)

Pb and Pr

−467 to +467

−505 to +505

−350 to +350

−324 to +324

Sync Depth

+286

+300

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