ADV7181BBCPZ datasheet(78/96 Pages) AD

78 / 96 page

ADV7181B

Rev. 0 | Page 78 of 96

Bits

Subaddress

Bit Description

210

Comments

Notes

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.

CAGC[1:0] settings

decide in which

mode CMG[11:0]

operates

Reserved

Set to 1

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

Has an effect only if

CAGC[1:0] is set to

auto gain (10)

0x2E

Chroma

Gain

Control 2

CMG[7:0]. Chroma manual gain

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

description.

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)

LMG[11:8]. Luma manual gain can

be used program a desired manual

chroma gain, or to read back the

actual gain value used.

LAGC[1:0] settings decide

in which mode LMG[11:0]

operates

Reserved

Set to 1

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

Only has an effect if

LAGC[1:0] is set to

auto gain (001, 010,

011,or 100)

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.

LMG[11:0] = 1234d; gain is

1 in NTSC LMG[11:0] =

1266d; gain is 1 in PAL

Min value

NTSC 1024 (G = 0.85)

PAL (G = 0.81)

Max value

NTSC 2468 (G = 2),

PAL = 2532 (G = 2)

0x31

Reserved

Set to default

Start of line relative to HSE

HSE = Hsync end

HVSTIM. Selects where within a line

of video the VS signal is asserted.

Start of line relative to HSB

HSB = Hsync begin

EAV/SAV codes generated

to suit ADI encoders

NEWAVMODE. Sets the EAV/SAV

mode.

Manual VS/Field position

controlled by registers

0x32, 0x33, and 0xE5–0xEA

VS and

FIELD

Control 1

Reserved

Set to default

Reserved

Set to default

VSBHE

VS goes high in the middle

of the line (even field)

VS changes state at the

start of the line (even field)

VSBHO

VS goes high in the middle

of the line (odd field)

0x32

VSync

Field

Control 2

VS changes state at the

start of the line (odd field)

NEWAVMODE bit

must be set high.

Reserved

Set to default

VSEHE

VS goes low in the middle

of the line (even field)

VS changes state at the

start of the line (even

field)

VS goes low in the middle

of the line (odd field)

0x33

VSync

Field

Control 3

VSEHO

VS changes state at the

start of the line odd field

NEWAVMODE bit

must be set high.

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