LM1247 National Semiconductor, LM1247 Datasheet - Page 38

• Manufacturer Part Number: LM1247
• Description: 150 MHz I2C Compatible RGB Preamplifier with Internal 512 Character OSD ROM, 512 Character RAM and 4 DACs
• Manufacturer: National Semiconductor

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Pre-Amplifier Interface Registers
Blue Channel Gain:
Green Channel Gain:
Red Channel Gain:
Contrast Control:
DAC 1 Output Level:
DAC 2 Output Level:
DAC 3 Output Level:
Bits 6–0
Bit 7
Bits 6–0
Bit 7
Bits 6–0
Bit 7
Bits 6–0
Bit 7
Bits 7–0
Bits 7–0
This register determines the gain of the blue video channel. This affects only the blue channel
whereas the contrast register (0x8433) affects all channels.
Reserved and should be set to zero.
This register determines the gain of the green video channel. This affects only the green channel
whereas the contrast register (0x8433) affects all channels.
Reserved and should be set to zero.
This register determines the gain of the red video channel. This affects only the red channel
whereas the contrast register (0x8433) affects all channels.
Reserved and should be set to zero.
This register determines the contrast gain and affects all channels, blue, red and green.
Reserved and should be set to zero.
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.
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.
Res’d
Res’d
Res’d
Res’d
X
X
X
X
CONTRCTRL (0x8433)
BGAINCTRL (0x8430)
GGAINCTRL (0x8431)
RGAINCTRL (0x8432)
DAC1CTRL (0x8434)
DAC2CTRL (0x8435)
DAC3CTRL (0x8436)
DAC 1 Output Level
DAC 2 Output Level
DAC 3 Output Level
GC[7:0]
RC[7:0]
BC[7:0]
Green Gain
38
Blue Gain
Red Gain
Contrast
GG[6:0]
BG[6:0]
RG[6:0]
CG[6:0]