LM1253A National Semiconductor, LM1253A Datasheet - Page 18
![no-image](/images/manufacturer_photos/0/4/469/national_semiconductor_sml.jpg)
LM1253A
Manufacturer Part Number
LM1253A
Description
Monolithic Triple 180 MHz I2C CRT Pre-amp With Integrated Analog On Screen Display (OSD) Generator
Manufacturer
National Semiconductor
Datasheet
1.LM1253A.pdf
(57 pages)
- Current page: 18 of 57
- Download datasheet (2Mb)
www.national.com
BGAIN
GGAIN
RGAIN
CONTRAST
BBIAS
GBIAS
RBIAS
BRIGHTNESS
PEDESTAL
OSD
CONTRAST
DC OFFSET
Pre-Amp Functional Description
An active horizontal blanking signal is added to the video at
the output, giving excellent smear performance, and pre-
venting video content dependent DC bias offsets as a result
of high frequency over shoot.
Parameter
8438h Bits 7–5
8438h Bits 4–3
8438h Bits 2–0
Address
8430h
8431h
8432h
8433h
8434h
8435h
8436h
8437h
TABLE 2. Registers Controlling the Output Video and Clamp Signal
FIGURE 28. Register Control of the Output Video and Clamp Signal
Size
7 Bit
7 Bit
7 Bit
7 Bit
8 Bit
8 Bit
8 Bit
8 Bit
3 Bit
2 Bit
3 Bit
Blue Channel Gain
Green Channel Gain
Red Channel Gain
Overall Gain of All Three Channels
Blue Bias Clamp Pulse Amplitude
Green Bias Clamp Pulse Amplitude
Red Bias Clamp Pulse Amplitude
Amplitude of Brightness Clamp Pulse of All 3 Channels
Offset to the Brightness Control
OSD Gain
Active Video DC Offset of All 3 Channels
(Continued)
18
The outputs are referenced to a DC level (V
the LM1253A preamp, and so are guaranteed to provide
stable DC operating levels within the system without the
need for additional external feedback components.
Description
DS101265-31
REF
) produced by
Default
60h
60h
60h
60h
80h
80h
80h
80h
4h
2h
4h
Related parts for LM1253A
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
![LM125](/images/manufacturer_photos/0/4/469/national_semiconductor_tmb.jpg)
Part Number:
Description:
VOLTAGE REGULATORS
Manufacturer:
National Semiconductor
Datasheet:
![LM126](/images/manufacturer_photos/0/4/469/national_semiconductor_tmb.jpg)
Part Number:
Description:
(LM125 / LM126) VOLTAGE REGULATORS
Manufacturer:
National Semiconductor
Datasheet:
![MC1408P8](/images/manufacturer_photos/0/4/469/national_semiconductor_tmb.jpg)
Part Number:
Description:
National Semiconductor [8-Bit D/A Converter]
Manufacturer:
National Semiconductor
Datasheet:
![CS1301](/images/manufacturer_photos/0/4/469/national_semiconductor_tmb.jpg)
Part Number:
Description:
National Semiconductor [Media Coprocessor]
Manufacturer:
National Semiconductor
Datasheet:
![LM4832N](/images/manufacturer_photos/0/4/469/national_semiconductor_tmb.jpg)
Part Number:
Description:
Digitally Controlled Tone and Volume Circuit with Stereo Audio Power Amplifier, Microphone Preamp Stage and National 3D Sound
Manufacturer:
National Semiconductor
Datasheet:
![LM4832M](/images/manufacturer_photos/0/4/469/national_semiconductor_tmb.jpg)
Part Number:
Description:
Digitally Controlled Tone and Volume Circuit with Stereo Audio Power Amplifier, Microphone Preamp Stage and National 3D Sound
Manufacturer:
National Semiconductor
Datasheet:
![LM4546](/images/manufacturer_photos/0/4/469/national_semiconductor_tmb.jpg)
Part Number:
Description:
AC97 Rev 2 Codec with Sample Rate Conversion and National 3D Sound
Manufacturer:
National Semiconductor
![LP2981AIM5X-2.7](/images/manufacturer_photos/0/4/469/national_semiconductor_tmb.jpg)
Part Number:
Description:
Manufacturer:
National Semiconductor
Datasheet:
![LP3988IMFX-2.6](/images/manufacturer_photos/0/4/469/national_semiconductor_tmb.jpg)
Part Number:
Description:
Manufacturer:
National Semiconductor
Datasheet:
![LPV321M7X](/images/manufacturer_photos/0/4/469/national_semiconductor_tmb.jpg)
Part Number:
Description:
General Purpose, Low Voltage, Low Power, Rail-to-Rail Output Operational Amplifiers
Manufacturer:
National Semiconductor
Datasheet:
![ADC0882CCN](/images/manufacturer_photos/0/4/469/national_semiconductor_tmb.jpg)
Part Number:
Description:
8-bit 20 MSPS flash A/D converter.
Manufacturer:
National Semiconductor
Datasheet:
![LM837N](/images/manufacturer_photos/0/4/469/national_semiconductor_tmb.jpg)
Part Number:
Description:
Low Noise Quad Operational Amplifier
Manufacturer:
National Semiconductor
Datasheet: