LM1229 Datasheet, PDF (1/28 Pages) National Semiconductor (TI) – I2C Compatible CMOS TV RGB and Deflection Processor

OBSOLETE
LM1229
www.ti.com
SNOSAH0D – MARCH 2005 – REVISED APRIL 2013
LM1229 I2C Compatible CMOS TV RGB and Deflection Processor
Check for Samples: LM1229
FEATURES
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•2 Fully Bus Controllable via an I²C Compatible
Interface
• Contrast Control for Simultaneously Adjusting
the RGB Output Peak to Peak Levels
• Gain Controls for Aligning the CRT Color
Temperature
• Color Tracking Brightness Control for
Maintaining Color Temperature Throughout
the Full Range of Adjustment
• Black Level Clamping to Ensure Output Level
Stability. The Polarity of the Logic Pulse Input
is Register Selectable
• Digital or Analog RGB OSD Inputs, with
Adjustable Transparency Available in the
Digital Mode and Clamping in the Analog Mode
for Black Level Stability
• Choice of Four Levels of OSD Amplitude
• Window Highlight using the OSD
Transparency Feature
• ABL Input for Reducing the Video Contrast
when the CRT Beam Current Exceeds the
Predetermined Threshold et by an External
Resistor
• Horizontal and/or Vertical Blanking Directly
from Deflection Signals. The Blanking can be
Disabled, if Desired
• Matched to TI's Driver and Clamp IC Families
• Black Level Output Adjustable from 0.5V to
1.4V for Compatibility with TI CRT Driver IC's
with or without PNP Transistor Buffers
• Three DAC Outputs for Setting CRT Cathode
Bias, which can be Set to Full or Half Scale
like the LM1267 Series of Preamplifiers
• Spot Killer which Blanks the Video Outputs
when V_CC Falls below the Specified Threshold
• RGB Power Saving Mode with 35% Power
Reduction
• Support for Seven Different TV Signal Formats
• RGB Blanking for Scan Loss Protection
• I²C Control over Horizontal and Vertical
Position and Size, Pincushion, Pin Balance,
Trapezoidal, Parallelogram, Top and Bottom
Corner Corrections, Vertical S and C
Correction, and Dynamic Focus Amplitude
• Programmable Duration 5V Vertical Blanking
Output Pulse
• Uses a Low Cost Resonator
• Status Register Indicating Vertical Scan Loss,
X-Ray, Horizontal Flyback and Horizontal Lock
Status
• Blanks the RGB Outputs Whenever the Loss of
Vertical Scan is Detected
• Independent Control over Horizontal and
Vertical Sync Input Polarities
APPLICATIONS
• Television Deflection and RGB Video
Processing with TI's CRT Drivers
DESCRIPTION
The LM1229 pre-amp is an integrated CMOS CRT
RGB preamp plus horizontal and vertical deflection
processing with an I²C compatible interface for
controlling all the parameters necessary to directly
adjust the gain, contrast and brightness and geometry
of the CRT display.
In the RGB section, the CRT bias is controlled by the
three DAC outputs which are matched to the LM248x
integrated bias clamp ICs. The brightness control
operates on the video channels rather than the bias
channels and is designed to maintain the CRT color
temperature through the full range of adjustment. The
On Screen Display inputs accept either digital or
analog input levels. Black level clamping of the video
signal is carried out directly on the AC coupled input
signal into the high impedance preamplifier input,
thus eliminating the need for additional clamp
capacitors. Blanking inputs are provided which can
accept both horizontal and vertical flyback inputs for
composite blanking of the video. A vertical blanking
output pulse is provided which can drive a G1
blanking amplifier such as the one in TI's LM2485
clamp IC. The LM1229 RGB outputs are compatible
with TI's high gain drivers.
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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