LM2467 datasheet(37/43 Pages) NSC

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Pre-Amplifier Interface Registers (Continued)

Bits 6–0

This register determines the gain of the red video channel. This affects only the red channel

whereas the contrast register (0x8433) affects all channels.

Bit 7

Reserved and should be set to zero.

Contrast Control:

CONTRCTRL (0x8433)

Res’d

Contrast

CG[6:0]

Bits 6–0

This register determines the contrast gain and affects all three channels, blue, red and green.

Bit 7

Reserved and should be set to zero.

DAC 1 Output Level:

DAC1CTRL (0x8434)

DAC 1 Output Level

BC[7:0]

Bits 7–0

This register determines the output of DAC 1. The full-scale output is determined by bit 5 of the

DAC Config, OSD Contrast & DC Offset Register.

DAC 2 Output Level:

DAC2CTRL (0x8435)

DAC 2 Output Level

GC[7:0]

Bits 7–0

This register determines the output of DAC 2. The full-scale output is determined by bit 5 of the

DAC Config, OSD Contrast & DC Offset Register.

DAC 3 Output Level:

DAC3CTRL (0x8436)

DAC 3 Output Level

RC[7:0]

Bits 7–0

This register determines the output of DAC 3. The full-scale output is determined by bit 5 of the

DAC Config, OSD Contrast & DC Offset Register (0x8438).

DAC 4 Output Level:

DAC4CTRL (0x8437)

DAC 4 Output Level

BA[7:0]

Bits 7–0

This register determines the output of DAC 4. The output of this DAC can be scaled and mixed

with the outputs of DACs 1–3 as determined by bit 6 of the DAC Config, OSD Contrast & DC

Offset Register.

DAC Config, OSD Contrast & DC Offset:

DACOSDDCOFF (0x8438)

Res’d

DAC Options

OSD Contrast

DC Offset

DCF[1:0]

OSD[1:0]

DC[2:0]

Bits 2–0

These determine the DC offset of the three video outputs, blue, red and green.

Bits 4–3

These determine the contrast of the internally generated OSD.

LM2467 Datasheet(PDF) 37 Page - National Semiconductor (TI)

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