ADV7183ABST datasheet(82/104 Pages) AD

82 / 104 page

ADV7183A

Rev. A | Page 82 of 104

Table 189. Register 0x2D to 0x30

Bit

Subaddress

Bit Description

Comments

Notes

CAGC[1:0] settings

decide in which

mode CMG[11:0]

operates

CMG[11:8]. Chroma manual

gain can be used to program a

desired manual chroma gain.

Reading back from this register

in AGC mode gives the current

gain.

Reserved

Set to 1

Has an effect only if

CAGC[1:0] is set to

auto gain (10)

Slow (TC = 2 s)

Medium (TC = 1 s)

Fast (TC = 0.2 s)

0x2D

Chroma

Gain

Control 1

CAGT[1:0]. Chroma automatic

gain timing allows adjustment of

the chroma AGC tracking speed.

Adaptive

CMG[11:0] = 750d;

gain is 1 in NTSC

CMG[11:0] = 741d;

gain is 1 in PAL

Min value is 0dec

(G = –60 dB)

Max value is 3750

(Gain = 5)

0x2E

Chroma

Gain

Control 2

CMG[7:0]. Chroma manual gain

lower 8 bits. See CMG[11:8] for

description.

LAGC[1:0] settings

decide in which

mode LMG[11:0]

operates

LMG[11:8]. Luma manual gain

can be used program a desired

manual chroma gain, or to read

back the actual gain value used.

Reserved

Set to 1

Only has an effect if

AGC[1:0] is set to

auto gain (001, 010,

011,or 100)

Slow (TC = 2 s)

Medium (TC = 1 s)

Fast (TC = 0.2 s)

0x2F

Luma Gain

Control 1

LAGT[1:0]. Luma automatic gain

timing allows adjustment of the

luma AGC tracking speed.

Adaptive

LMG[11:0] =

1234dec; gain is 1 in

NTSC LMG[11:0] =

1266dec; gain is 1 in

PAL

0x30

Luma Gain

Control 2

LMG[7:0]. Luma manual gain

can be used to program a

desired manual chroma gain or

read back the actual used gain

value.

Min value

NTSC 1024 (G = 0.85)

PAL (G = 0.81)

Max value

NTSC 2468 (G = 2),

PAL = 2532 (G = 2)

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