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LM1237

Features: I2C compatible microcontroller interfaceInternal 254 character OSD usable as either (a) 190 2-color plus 64 4-color characters,(b) 318 2-color characters,or (c) some combination in between.OSD override allows OSD messages to override video and the use of burn-in screens with no video inp...

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SeekIC No. : 004394588 Detail

LM1237: Features: I2C compatible microcontroller interfaceInternal 254 character OSD usable as either (a) 190 2-color plus 64 4-color characters,(b) 318 2-color characters,or (c) some combination in between...

LM1237 Data Sheet

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Part Number:
LM1237
Supply Ability:
5000

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  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2024/12/25

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Product Details

Description



Features:

I2C compatible microcontroller interface
Internal 254 character OSD usable as either (a) 190 2-color plus 64 4-color characters,(b) 318 2-color characters,or (c) some combination in between.
OSD override allows OSD messages to override video and the use of burn-in screens with no video input
4 DAC outputs (8-bit resolution) for bus controlled CRT bias and brightness
Spot killer which blanks the video outputs when VCC falls below the specified threshold
Suitable for use with discrete or integrated clamp, with software configura blebrightness mixer
H and V blanking (V blanking is optional and has register programmable width)
Power Saving Mode with 80% power reduction
Matched to LM246x driver and LM2479/80 drivers




Application

Low end 15" and 17" bus controlled monitors with OSD
1024x768 displays up to 85 Hz requiring OSD capability
Very low cost systems with LM246x driver




Specifications

Supply Voltage, Pins 15 and 19 6.0V
Peak Video DCO utput Source Current
(Any One Amp) Pins 18,19 or 20 1.5mA
Voltageat Any VCC+0.5>VIN>−0.5V
Input Pin(VIN)
Video Inputs (pk-pk) 0.0<VIN<1.2V
Thermal Resistance to Ambient(JA) 51˚C/W
Power Dissipation (PD)
(Above 25˚C Derate Based on JA and TJ)2.4W
Thermal Resistance to case(JC) 32˚C/W
Junction Temperature(TJ) 150˚C
ESD Susceptibility (Note 4) 3.5kV
ESD Machine Model (Note13) 350V
Storage Temperature −65˚C to +150˚C
Lead Temperature (Soldering, 10 sec.) 265˚C

Temperature Min 0 deg C
Temperature Max 70 deg C
Gain Bandwidth 150 MHz
Gain 4.2 V/V
Channels 3 Channels
Customizable OSD Yes
ROM Characters 254
Output Rise Time (tr) 3.1 ns
Output Fall Time (tf) 2.9 ns
Supply Voltage 5 Volt
Characters 254
2 Color 190
4 Color Fonts 64
FadeIn/FadeOut No
Auto Sizing No
Half Tone No
Programmable Horizontal Blanking Yes
Programmable Vertical Blank Pulse Yes
Power Save Yes
DisplayType CRT
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Description

The LM1237 pre-amp is an integrated CMOS CRT preamp. It has an I2C compatible interface which allows control of all the parameters necessary to directly setup and adjust the gain and contrast in the CRTd is play.Brightness and bias can be controlled through the DAC outputs which are well matched to the LM2479 and LM2480 integrated bias clamp ICs.The LM1237 preamp is also designed to becom patible with the LM246x high gain driver family.

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.Horizontal and vertical blanking of the outputs is provided.Vertical blanking is optional and its duration is register programmable.

The LM1237 is packaged in an industry standard 24 lead DIP molded plastic package.






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